The Unified Group’s Service Management Forum Focuses on Developing Industry Leaders

March 20, 2023

In January, members of The Unified Group collected for the 2023 Assistance Management Discussion board in Nashville to see longtime buddies, cultivate new associations and experience the enjoyment of Music Metropolis. In two and a half times, customers shared their ideal ideas, tactics that didn’t operate and broke into more personal discussions with the target to enable one yet another reach the finest versions of on their own.

For the complete 1st day, Randy Nemchin of Radical Direction Consulting led the team. His major focuses were being Quiet Quitting and The Fantastic Resignation. Ranging from massive group discussions to interactive functions, Nemchin captured the notice of the whole group.

“I loved his workshop,” reported Juan Flores of Blauch Brothers, Inc. “It has been one particular of my favorites, and it was wonderful how speedy the working day went by.”

Day a person finished with supper at Ole Pink, Blake Shelton’s restaurant, in which the group skilled community are living tunes and camaraderie.

The scorching topic of the second working day touched on two factors the field continues to battle with: personnel recruiting and retention. During this segment, the three presenters — Chris Stokes of Air Controls, Mike Kerner of Cox-Powell Company and Erick Wheeler of Dean E. Norris, Inc. — shared their techniques to obtain new workers and give an atmosphere to maintain them.

“I respect everybody in this team and their contributions,” claimed Steve Adams of Johnson and Jordan, Inc. “I constantly go away with a little something to choose back again and employ.”

That night, The Unified Team hosted an optional team exercise for associates that incorporated a mixology class at Liquor Lab and finished with samples of beer at New Heights Brewery.

Working day three was a 50 percent working day but whole of data, with the highlight being Technical Instruction. Jennifer Yee of J&J Air Conditioning and Bret Nielsen of Harvey W. Hottel shared the approach of how their corporations successfully educate forthcoming techs. Eventually, users of the viewers were being equipped to request questions in serious-time and get fast opinions.

Just after another excellent assembly of the very best-in-course contractors inspiring a single yet another, customers of The Unified Team realized new strategies to increase their aggressive gain at their respective organizations.

“Everything about this team was an remarkable working experience,” explained Hutch Henry of EES Facility Companies. “I was promptly welcomed by all people and beloved how it felt like a spouse and children party. I’m thrilled to retain in touch with all people and to continue to discover and employ new concepts!”

Future instruction sessions consist of Controls, Succession Setting up, Smaller/Exclusive Assignments, Building and much more. If your business, or an additional organization you know, could be a good match for The Unified Team, call Janet Kelleher at [email protected]

About The Unified Group

Formed in 1998, The Unified Group is an firm of the major independent HVAC commercial contractors in the marketplace. The affiliation assists improve its member businesses as a result of a selection of teaching and sources and is devoted to raising the specifications of excellence in the HVACR industry. For a lot more info, go to

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What Technology Trends will Impact the HVAC Industry in 2023?

January 18, 2023

‘Tis the time for New Year’s predictions, and as soon as all over again the HVAC sector would seem very likely to be dominated by technology. From eco-friendly heating and cooling alternatives to field service management (FSM) software program that can improve operational efficiency and improve purchaser service to innovations like artificial intelligence (AI), virtual actuality, and the Internet of Items (IoT), technologies will effect nearly just about every element of the HVAC organization in the yr in advance.

Garrett Wilson

With charges swiftly growing and many economists predicting a economic downturn, buyer anticipations for aggressive charges, accurate occupation estimates, and specific scheduling are probable to be greater than ever in 2023. Provided that, glimpse for HVAC companies to change significantly to FSM software program to effectively routine, dispatch, and assign positions based on their sizing, scope, and worker availability.

FSM software will allow HVAC corporations to build calendars that cross-reference staff assignments, easily going employees from position-to-occupation so there are no squandered services hrs, even though concurrently tracking expenses to present further insights into career profitability. Endeavor administration parts, in the meantime, can prioritize stops, track time, and handle workloads, while inventory administration features will automate materials prerequisites, get the job done and manufacturer orders, barcoding, and bills of elements.

AI will be at the coronary heart of many of these functions. Simulating human intelligence, AI automates the most repetitive, time-consuming areas of the career, this kind of as scheduling and assigning perform, when enabling experts to gather and review authentic-time info from the area in order to cure problems and total employment speedier. This, in flip, will support HVAC firms to better monetize expert services and crank out new revenue streams.

HVAC companies can also be expecting consumer demand for sustainable remedies to increase markedly in the calendar year forward. With much more buyers demanding strength-successful techniques to heat and neat their residences and companies – and a lot more governments supplying grants and tax credits for working with renewable strength sources – HVAC experts are most likely to stay occupied putting in a broad variety of environmentally helpful technologies, from solar-powered HVAC methods to geothermal and twin gas heat pumps.

HVAC systems which depend on IoT units will also be in higher desire in the coming year. Embedded with sensors, software program, and connectivity, IoT is powering anything from wise thermostats to sensor-improved vents that monitor and handle space temperature and air excellent. Employing IoT, HVAC contractors can provide actual-time details to shoppers by way of dashboards that clearly show electricity consumption and utilization styles, products which can be bundled with company contracts for added recurring profits.

Know-how will even effects the way in which HVAC professionals are remaining trained. In 2023, glimpse for more HVAC businesses to use virtual fact (VR) to educate new workers and preserve current technicians up-to-speed on the newest improvements. Far more cost-helpful than traditional schooling methods, VR simulations give specialists fingers-on encounter working with equally regime do the job and new products in a risk-free of charge environment, though making it possible for them to emphasis on situations they come across most tricky to diagnose.

Plainly, HVAC know-how is not only here to stay, but will keep on to evolve in 2023 and over and above. With that in head, HVAC organizations will need to establish how they can finest leverage tech innovations to stay aggressive in the confront of heightened buyer needs and a tightening economy.

Garrett Wilson is the president and co-founder FieldBin. He has been a serial entrepreneur and professional at building and branding startups for above 20 decades. His expertise involves numerous higher progress startups, SaaS goods, M&A, fund elevating, and agencies that leveraged his deep knowledge in equally B2B and buyer markets.

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HARDI Distributors Report 18.0% Percent Revenue Increase in September

November 08, 2022

Heating, Air-conditioning & Refrigeration Distributors International (HARDI) launched its month-to-month Developments report, demonstrating the regular product sales general performance by HARDI distributors was an raise of 18.% per cent in the course of September 2022.

The common once-a-year revenue expansion for the 12 months via September 2022 is 23.5% percent.

“That once-a-year progress level chart is seeking exhausted,” mentioned HARDI Industry Exploration & Benchmarking Analyst Brian Loftus. “The annual advancement has been flat-to-down due to the fact the beginning of the calendar year. It has been supported by the pass-through of aggressive selling price raises and the sector PPI is now losing altitude.”

 The Days Product sales Exceptional, a evaluate of how promptly clients fork out their expenses, is 42 times as of September 2022. “The September DSO pre-COVID was 46.5 days. The calendar year-to-12 months DSO has amplified for three consecutive months,” explained Loftus. “The very last time that took place was late 2019 when the overall economy was slowing.”

 September is the previous thirty day period of cooling time, and additional than 40% of HARDI distributor once-a-year profits with happen from Might via August. “Cooling time was mixed this calendar year,” said Loftus. “A strong year needs heat weather conditions at the starting, and we were being off to a great begin throughout April and May. Then Cooling Degree Times had been beneath normal and the prior 12 months for the duration of June, and then frequently smooth for the duration of July, August, and September. That implies a modest 12 months-to-calendar year climate comp for the duration of 2023 cooling period when we hope the macro ailments to be considerably less accommodating.”

HARDI members do not acquire economic compensation in trade for their regular sales info and can discontinue their participation with no prior see or penalty. Participation is voluntary, and the depth of industry protection varies from location to region. An independent entity collects and compiles the information that can include things like solutions not directly connected with the HVACR market.


HARDI (Heating, Air-conditioning and Refrigeration Distributors Intercontinental) is the one voice of wholesale distribution within the HVACR field. HARDI associates industry, distribute, and guidance heating, air-conditioning, and refrigeration machines, parts and materials. HARDI Distributor members serve installation and assistance/replacement contractors in residential and professional markets, as well as business/industrial and institutional routine maintenance staffs. HARDI proudly signifies more than 460 distributor customers representing more than 5,000 branch spots, and shut to 500 provider, producer representative and company vendor users.

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HARDI Distributors Report 24.8% Percent Revenue Increase in August

Oct 19, 2022

Heating, Air-conditioning & Refrigeration Distributors International (HARDI) launched its every month Trends report, demonstrating the common gross sales general performance by HARDI distributors was an enhance of 24.8% percent in the course of August 2022.

The common annual profits advancement for the 12 months by way of August 2022 is 24.2% per cent.

“The August income advancement was assisted by an further billing working day. We estimate the profits progress would have been closer to 19% with the identical quantity of billing days,” claimed HARDI Market Exploration & Benchmarking Analyst Brian Loftus. “This gross sales progress is helped by passing by way of cost improves of extra than 20%. All those will increase have also been supporting the annual progress price that has been constant around this speed for nine months.”

The Days Sales Outstanding, a measure of how immediately shoppers spend their payments, stays at 40 days as of August 2022. “The August DSO pre-COVID was extra than 44 times. The DSO has been decreased post-COVID, but we assume this to return to the pre-COVID levels,” claimed Loftus. The yr-to-calendar year DSO has greater slightly for two consecutive months.

Buyer Sentiment, an important indicator of demand for HARDI member solutions and companies, has bounced off the new lows, but remains in bearish territory. “After house selling prices have enhanced by 40% for the duration of the past two yrs, house loan costs have doubled, which is an further problem for potential buyers,” claimed Loftus. “Now property charges are rolling over and that will be an additional burden for Client Sentiment.”

HARDI users do not get economical compensation in trade for their month-to-month product sales data and can discontinue their participation devoid of prior see or penalty. Participation is voluntary, and the depth of market place coverage differs from area to location. An independent entity collects and compiles the data that can involve merchandise not immediately linked with the HVACR field.

HARDI (Heating, Air-conditioning and Refrigeration Distributors International) is the single voice of wholesale distribution within the HVACR business. HARDI associates industry, distribute, and aid heating, air-conditioning, and refrigeration devices, components and materials. HARDI Distributor users serve set up and support/alternative contractors in residential and industrial marketplaces, as effectively as professional/industrial and institutional maintenance staffs. HARDI proudly represents additional than 460 distributor members symbolizing more than 5,000 department destinations, and close to 500 provider, producer agent and service vendor users.

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Demystifying CO2 Refrigeration – HVAC Insider

September 28, 2022

An introduction to the characteristics, nuances and applications of an emerging natural refrigerant

By Andre Patenaude, Director, Solutions Strategy, Emerson

The use of CO2 as a refrigerant (R-744) in commercial refrigeration is expected to rise significantly in the U.S. over the next several years. With a global warming potential (GWP) of 1 and zero ozone depletion potential (ODP), CO2 is one of several emerging refrigerants capable of enabling food retailers to meet their sustainability goals and comply with environmental regulations.

Although CO2 refrigeration has been a known commodity on the world stage for many decades, many supermarket owners, operators and service technicians in the U.S. have had very little (if any) exposure to it. The characteristics of CO2 refrigeration are quite different from traditional hydrofluorocarbon (HFC)-based systems, which has created reservations about applying it within U.S. food retail outlets.

Today, as U.S. food retail stakeholders transition away from high-GWP HFC systems, they have many questions about emerging CO2 refrigeration technologies. This article, combined with our CO2 Chats video series, is designed to demystify CO2 refrigeration and provide the basic information needed to help establish a foundational understanding.

Unique properties of R-744

Compared to legacy HFC refrigerants, R-744 has a multitude of distinct thermo-physical properties and performance characteristics.

Low critical point

Among its many distinguishing characteristics, R-744 has a low critical point of 87.8 °F — which from a refrigeration perspective, is a relatively low temperature. When the ambient (outside) temperature rises above approximately 75 °F, system conditions cause the refrigerant to enter the gas cooler as a supercritical fluid (at or above 87.8 °F), where its pressure and temperature relationships can rise and fall independently of each other. R-744 is at saturation when it is below the critical point, which is referred to as subcritical mode; above 87.8 °F, the refrigerant transitions to transcritical mode.

High operating pressures

CO2 system operating pressures are significantly higher than traditional HFC systems (i.e., those using R-404A or R-410A). Although this often gives service technicians pause when they first encounter CO2 transcritical booster systems, understanding where those pressures occur can give them a greater comfort level. As medium-temperature (MT) compressors discharge into a gas cooler on the roof, pressures could reach 1,400 psi on a 95 °F summer day. MT discharge lines are constructed with stainless steel or special ferrous alloy copper to handle these pressures.

Within a facility and/or machine room, a high-pressure expansion valve reduces the refrigerant pressure exiting the gas cooler to around 550 psi and transfers it to a receiver tank, commonly referred to as a flash tank. Liquid refrigerant exits at the bottom of the flash tank via a main liquid line at 40 °F (550 psi) and feeds all the MT evaporators, which operate at about 22 °F (420 psi). It also feeds all the low-temperature (LT) evaporators, which operate near -20 °F, at an even lower pressure of 200 psi. Although system pressures are higher than what most technicians are accustomed to, proper training and tools should mitigate the reservations of CO2’s high pressures.

High triple point

R-744 has a high triple point at which the refrigerant’s gas, liquid and solid states coexist — occurring at
-69.8 °F and 60.4 psi. Although -69.8 °F is well below normal operating ranges, its corresponding saturation pressure is not 60.4 psi. The hyper-reactivity of a CO2 system can cause the pressure to reach 60.4 psi or lower. When this occurs due to improper maintenance, R-744 turns into dry ice, stops the refrigerant flow, and causes a variety of potential problems.

High density

R-744 has other unique performance and operating characteristics that dictate system design strategies. Because it has a higher density than typical HFC refrigerants, CO2 requires the use of smaller compressor displacements — although the motor is sized similarly to carry the workload. CO2’s higher density means that smaller pipe diameters can be used, especially on the suction side of the system. Due to its high pressures, system components must be rated for a higher maximum working pressure.

Servicing best practices

CO2 transcritical booster system installations are expected to increase significantly in the next few years. It’s only a matter of time before technicians will be asked to perform service on them. Technicians should be aware of the following basic best practices when servicing these systems.

Storing CO2

R-744 tank storage and/or refrigerant cylinder best practices are similar to those of legacy HFCs, including stacking procedures, safety precautions and assigning designated storage areas. To handle its high pressures, CO2 tanks are reinforced and weigh significantly more than HFC tanks. Empty CO2 tanks can weigh close to 123 lbs. and can reach nearly 180 lbs. when fully charged. Supermarkets that prefer to have an entire system charge in reserve could potentially require 2,000 lbs. of refrigerant. Storing that amount would require 40 cylinders weighing 7,200 lbs. — or 3.6 tons. Contractors need to understand where to store the reserve refrigerant and if the sheer volume and weight could affect building codes and/or a building’s structural integrity.

Charging a CO2 refrigeration system

When charging a CO2 refrigeration system, the most important consideration a technician should keep in mind is the refrigerant’s triple point pressure (60.4 psi) and how to guard against turning the charge to dry ice. Instead of charging with liquid CO2 when the system is below 60.4 psi, contractors should charge with vapor until the system reaches CO2’s triple point. Failure to do so is likely to result in the formation of dry ice in the charging line, a common (and potentially costly) mistake for those unfamiliar with CO2 installations. Most equipment manufacturers recommend charging the system with vapor until it reaches at least 100 psi. After achieving 100 psi with vapor, which has equalized throughout the entire system, technicians can switch charging with liquid to speed up the process.

Dealing with trapped liquid

Because CO2’s coefficient of expansion (COE) is higher than a typical HFC refrigerant, it has a higher probability of refrigerant pressure increasing rapidly between two valves. If this occurs, the pressure can increase 145 psi for every 1.8 °F increase in temperature. As a result, sections of a system need to be fitted with appropriate check valves or pressure-relief valves for safe system operation and service.

Detecting leaks in CO2 systems

Because R-744 refrigerant is colorless, odorless and heavier than air, it can be difficult for building occupants to detect leaks. CO2 transcritical booster systems must utilize integrated leak detection systems with detection devices mounted 18 inches off the ground. Like HFC systems, it’s important to immediately detect and mitigate CO2 leaks as they occur.

Emerson has designed CO2-specific leak detection technology that quickly can sense the presence of higher levels of CO2 in a machine room or walk-in box. Emerson offers both a stand-alone CO2 leak detection solution as well as devices that can be seamlessly integrated into a building management system (BMS), such as the Lumity™ supervisory control platform.

Safe handling best practices

Technicians should take proper precautions when handling high-pressure CO2 refrigeration systems. Even when a system is shut off, standstill pressures are still likely to remain high and should be handled accordingly. Because it is heavier than air, CO2 can quickly displace O2 when it is released in excessive amounts. Thus, technicians should avoid handling it in confined spaces and ensure they use proper leak detection procedures and equipment. In addition, CO2 vapor temperature at atmospheric pressure is -109.3 °F; technicians should follow proper service procedures and always wear personal protective equipment (PPE) to limit the potential for skin burns. With proper training, tools and equipment design — and when maintained and operated properly — CO2 is a safe and natural refrigerant alternative.

Fundamentals of CO2 system operation

Because of R-744’s many distinguishing performance characteristics, CO2 transcritical booster system design can seem more complex to operate and service. Fortunately, system control technologies have evolved to manage nearly all aspects of operation and make it easy for operators to manage these complexities. Even so, end users and contractors should be aware of the basic principles when operating CO2 transcritical booster systems.

The difference between subcritical and transcritical modes

CO2 transcritical booster systems are designed to transition between subcritical and transcritical modes of operation. When R-744 is at saturation and below the critical point of 87.8 °F, a system operates in subcritical mode. Above this refrigerant temperature, R-744 is no longer at saturation and the system enters transcritical mode. Unlike traditional HFC systems that have much higher critical points, CO2 systems could operate for extended periods while in a transcritical mode in a typical year.

Managing high system pressures

R-744 is a very dynamic refrigerant that reacts quickly to changes in pressures and temperatures. During the commissioning of a CO2 transcritical booster system, it’s important to establish a stable baseline of performance. To achieve this, technicians should focus their efforts on the configurations of the gas cooler, high-pressure valve and flash tank, including:

–          Controlling variable fan speeds

–          Modulating the high-pressure valve

–          Modulating the bypass gas valve

–          Maintaining a consistent flash tank pressure

–          Assuring smooth compressor staging

Since all those aspects are managed by electronic controls, technicians will need to interface with these controls to bring the key system components into equilibrium.

Preserving CO2 system charge during a shutdown

Power outages and system shutdowns can have significant impacts on a CO2 transcritical booster system. In the event of an extended shutdown, CO2 transcritical booster systems are designed with pressure-relief valves in each zone to allow for the safe release of refrigerant. During brief shutdowns, system pressures typically don’t rise quickly enough to cause concern. A system’s existing thermal inertia — from its flash tank, liquid line, MT and LT evaporators — will sustain proper pressures for a significant period of time. The temperatures outside and inside the building, among other factors, are likely to impact how long pressure will be sustained.

Another method for keeping pressures in check and preventing the release of system charge during an extended power outage is through an auxiliary condensing unit powered by a backup generator. The condensing unit typically utilizes a dedicated heat exchanger connected to the system’s flash tank or receiver. When the system is powered down, warm gas from the receiver naturally migrates through the cold heat exchanger, cools the flash tank vapor, condenses it into a liquid, and returns it to the flash tank at a colder temperature and lower saturation pressure. This helps to prevent the loss of refrigerant through pressure-relief valves.

Preventing flooded evaporators during a power outage

CO2 transcritical booster systems are designed with specific strategies to prevent CO2 evaporators from flooding during a power outage. When the power drops in a system using a stepper-motor electronic expansion valve (EEV), the EEV typically will hold its exact position. Accordingly, CO2 transcritical booster systems are often designed to have a solenoid valve at the inlet of the EEV, which can be set to close upon losing power to help prevent flooding of the evaporator. Another strategy that would work is to install a battery backup on the case control to shut off refrigerant flow when necessary.

Systems equipped with pulse-width modulated (PWM) valves — which are in effect high cycle rate solenoid valves — are designed to automatically close to prevent liquid from flooding the evaporator, thereby protecting the compressor when power comes back on. Before the system is up and running again, service contractors should make sure that they clearly understand how the valves in each system will operate and/or close — and to confirm that any floodback mitigation strategies have worked as expected.

Leading CO2 system design strategies

Refrigeration system designers have made tremendous strides in exploiting CO2’s unique properties into sustainable refrigeration architectures. Today, system design strategies have evolved into two primary architectures that differ greatly from traditional HFC-based systems.

CO2 transcritical booster system

CO2 transcritical booster systems are designed so that MT compressors discharge into a gas cooler, typically located on the roof of a facility. With system pressures potentially reaching 1,400 psi on a hot summer day, R-744 must be cooled before it can be condensed. Thus, refrigerant is circulated back into the building through a high-pressure valve, which drops the pressure to a useable state (550 psi) and deposits a refrigerant mixture of vapor and liquid inside the flash tank at 40 °F equivalent saturation.

Next, the system circulates the 40 °F liquid through insulated liquid lines to feed all the MT and LT cases and provide the cooling loads. The MT cases are equipped with an EEV, and the MT suction gas feeds the MT compressors. On the LT side where loads could be -20 °F, the cases are also fitted with an EEV and are supported by a separate set of LT compressors that discharge into the MT suction group.

The system also utilizes a bypass line that’s designed to relieve the pressure on the flash tank. As ambient temperatures rise and fall, flash tank pressures can also fluctuate. Thus, the bypass line helps to release the excess flash tank pressure through a bypass gas valve and stabilize it to approximately 550 psi (pressure may vary based on system design), where it is directed into the MT suction group. In effect, the MT compressors are being fed by three sources:

–          The total heat of rejection from the LT compressors

–          The MT suction from the evaporators

–          The excess flash gas via the bypass line

The system is called a booster system because the LT compressors are not going directly to the gas cooler, like they would on a typical HFC system. Instead, the LT compressors discharge into the MT compressors, thereby allowing the MT compressors to boost the refrigerant to the gas cooler.

CO2 cascade system

A CO2 cascade system offers an alternate architecture for retailers who want to deploy a low-GWP option but may not want a full CO2 transcritical booster system. In a CO2 cascade system, the high (MT) and low (LT) stages are completely independent of each other, except for one heat exchanger that connects them.

Typically, the high stage of a supermarket system would use a lower-GWP, medium-pressure HFC refrigerant, such as R-513A. Not only does it serve the MT loads, but it is also used to condense the CO2 in the low stage. In the low stage, CO2 is discharged, condensed in a condenser, and then recirculated for LT loads. R-744 is a very effective refrigerant for LT loads; and with a GWP of 1, it contributes to a cascade architecture that could meet many retailers’ sustainability objectives.

Leveraging heat reclaim

CO2 systems are excellent candidates for heat reclamation strategies. In fact, most modern CO2 systems utilize some form of heat reclamation — whether it’s for providing heated air, hot water, or even heating slabs beneath freezers. Many retailers are capitalizing on this opportunity to lower their emissions and reliance on fossil fuels. In addition, the liquid quality of R-744 is not affected when head pressures are raised to generate more heating capacity. Instead, the flash tank or receiver is designed to keep refrigerant at a consistent pressure, even while head pressures may fluctuate while operating in transcritical mode.

Optimizing the COP via the high-pressure control

When R-744 exceeds its critical point of 87.8 °F, the refrigerant enters a supercritical phase where the relationship between pressure and temperature becomes uncoupled. To optimize the coefficient of performance (COP) in a CO2 transcritical booster system, we must understand the function of the gas cooler and the characteristics of R-744 as it enters this supercritical zone.

Below the critical point, the gas cooler acts like a condenser. Thus, R-744 exists in a predictable state of saturation — if you know the pressure, you can determine the temperature (and vice versa). In its subcritical state, the high-pressure control algorithm automates system pressures according to a specified sub-cooling setpoint.

Above 87.8 °F, the pressure can change without having an impact on the temperature (and vice versa). System designers can take advantage of this phenomenon when optimizing COP. When operating transcritical mode, the high-pressure control always seeks to maintain an optimal pressure setting for each gas cooler outlet temperature. Today’s sophisticated high-pressure controls are continually adjusting gas cooler outlet pressures in transcritical mode to produce the most optimal BTU/W option.

Maintaining energy efficiencies in warm climates

The energy consumption of a refrigeration system is a key factor when evaluating its total cost of ownership (TCO). For a CO2 transcritical booster system, energy efficiency is dependent on many factors, including:

–          The ambient temperature range

–          The humidity of the region

–          The availability of and cost of water

–          The cost of peak demand charges

Among these factors, the goal of improving system energy efficiencies in warmer climates has become a major focus area for equipment manufacturers. Leading system design optimization strategies typically include:

–          Adiabatic gas cooler

–          Parallel compression

–          Mechanical sub-cooling

–          Gas ejector

–          Zero superheat control of MT evaporators (annualized benefit)

–          Liquid ejector (annualized benefit)

Retailers must consider all these variables and strategies when they work with their equipment suppliers and design engineers to specify a CO2 transcritical booster system.

Adiabatic gas cooler

An adiabatic gas cooler utilizes wetted pre-cooling pads outside the condenser coils to delay a CO2 transcritical booster system from entering into transcritical mode. When the ambient temperature reaches about 72 °F, a water solenoid valve is energized, causing water to be sprayed along the top of the adiabatic pads. As the water trickles down the pads, a condenser pulls air through these wetted pads, causing moist, cooler air to hit the coils. In turn, the condenser reacts to this cooler air and drops the temperature and pressure, making the system significantly more energy-efficient by operating at lower pressures.

Parallel compression

In a CO2 transcritical booster system, parallel compression refers to the practice of adding a separate suction group that is “parallel” to the existing MT suction. Thus, instead of the bypass gas circulating from the flash tank to the MT suction as in a standard transcritical booster system, the parallel compressor suction group compresses excess flash gas and circulates it directly to the gas cooler.

This allows the parallel compressor to operate at a suction pressure of about 550 psi (the same as the flash tank), instead of the MT suction of 420 psi. The net effect of leveraging the higher suction pressure is achieving higher compressor capacity for less effort, which translates into a lower heat of compression and reduced energy consumption. Parallel compression is considered a foundational high ambient strategy with which other energy mitigation methods can be used in combination. When annualized in a typical environment, it can potentially save up to 10% in energy costs.

To learn more about the topics discussed herein, please view the companion installments in our CO2 Chats video series. For more information about Emerson’s comprehensive CO2 products and capabilities, please visit

Andre is responsible for supporting system-related innovation and leveraging Emerson’s global cold chain to drive adoption of integrated solutions in North America. He most recently led marketing efforts pertaining to Emerson’s food retail and chiller markets. Prior to that, he had managed Emerson’s global CO2 development. 

Andre has more than 35 years of industry experience in sales, marketing, training and business development of HVACR system architectures and applications with compression and component technologies. He is a certified Mechanical Engineering Technologist C.E.T. (since 1984), and is a member of AHRI, ASHRAE and RSES.







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APR Supply Co. Meets on Capitol Hill with Congressman Smucker – HVAC Insider

September 28, 2022

APR Provide Co. President and CEO, Scott Weaver, and Congressman Lloyd Smucker met in Washington D.C. to go over quite a few subject areas encompassing the HVAC sector moving forward with regulatory variations.

The industry shift in the direction of renewable heating and air conditioning equipment brings concern of amplified environmental threat, higher substitute, and maintenance expenditures. Potential power effective needs will impact household and professional air conditioners and warmth pumps. Weaver shared worries surrounding the effects upon the market, as very well as domestic struggles that could manifest with the transition to new low global warming potential refrigerants that are not compatible with recent units. “The alter demands a world-wide warming potential of 750 or considerably less,” says Jeff Thompson, Vice President of Dealer Solutions. “The producers are starting to redesign equipment to function with these refrigerants and the troubles they pose.”

Scott Weaver, Jeff Thompson, and other APR leaders sit on business boards and committees for corporations like American Provide Affiliation, HARDI, and Affiliated Distributers. Visits like this one particular to Capitol Hill in excess of the a long time have been to guidance the HVAC & Plumbing business.

APR Provide Co. is headquartered in Lebanon, Pennsylvania. A third era, 100-year total-provider distributor of plumbing, HVAC, and hydronic materials – at 38 destinations in the course of Pennsylvania, New Jersey and Delaware. Check out for a lot more facts.

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The Future of the HVACR Industry is Here – HVAC Insider

September 16, 2022

Know-how in the HVACR industry is in the beginning of a fantastic Renaissance. Decarbonization and electrification of buildings, the changeover from fossil fuels, new M1 restrictions and how this has an effect on method screening by companies I.E. SEER2, flammable refrigerants, incentives from the Inflation Reduction Act and utilities are a few examples of the transition HVACR gurus should prepare for.

The United States Division of Strength along with their global counterparts are placing forth initiatives for decarbonization and electrification. Subsequently, utilities are seeking means to strengthen the efficacy of their grids, persuade extra effective use of consumed energy, integrate renewable electricity means, all although decreasing greenhouse fuel emissions. As the HVACR marketplace moves absent from fossil fuels, HVACR industry experts will will need to be educated on the technologies that spearheading the electrification of our sector to keep suitable and take part in utility incentives.

In the same way, the signing of the American Innovation and Manufacturing (Aim) Act, in December of 2020 started the phasedown of HFC refrigerants. Therefore, HVACR professionals have to get ready for the safe handling, storage, and transportation of Minimal GWP Refrigerants, numerous of which are flammable.

The long run is here! To retain apprised of these modifications, we have two-good opportunities for you to get initial-hand information from leading producers, and subject specialists. Sign up for us every single Thursday at 4:30 eastern for our are living webcast. Then be a part of us at the South Stage Hotel, March 20-22, 2023, to meet in individual with these leaders in the course of the Countrywide HVACR Education and learning Convention. We hope that you will be a part of us March 20-22, 2023, at the South Place Resort in Las Vegas, Nevada.

Find out more about these options at

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Emerson Announces New HVACR Blog Platform to Address Industry’s Top Challenges – HVAC Insider

September 07, 2022

Emerson (NYSE: EMR) declared the launch of its new E360 Website, a assumed management platform that extends its previous Climate Discussions web site to consist of a broader assortment of sector subjects, increasing its reach to refrigeration, air conditioning and other HVACR stakeholders. The platform is supposed to help beating marketplace worries such as refrigerant polices, technician scarcity/trade abilities gap, sustainability initiatives, business developments, technologies advancements, and improved efficiencies.

The blog gives enhanced navigation and written content accessibility with featured posts and categorization by precise matters this sort of as chilly chain, refrigeration, heating and air conditioning, laws, sector and technician strategies and alternatives spotlights. Further more filtering is obtainable to slim in on marketplaces, regulatory forms and technological concentrate.

“We are fired up about the start of our new E360 Blog site that will encompass written content all over Emerson’s many market initiatives,” reported John Schneider, president, HVACR Systems, Americas for Emerson “This site is actually an extension of our study and tests attempts to assistance first machines companies, contractors, stop customers and industry leaders as they keep on to navigate new restrictions, sustainability initiatives and other business problems.”

The blog will deliver uncomplicated accessibility to other Emerson field assistance platforms, which include their E360 Written content Hub, HVAC On Air podcast series and AC & Heating Join blog internet site.

Emerson carries on to increase its concentration on rigorous item testing and substantial exploration to offer you trustworthy, high-performance and decreased-GWP refrigerant answers to meet up with efficiency and refrigerant polices. The website and other platforms will emphasize how those people initiatives are functioning to profit the HVACR field. Look at out the new blog system right here.

About Emerson

Emerson (NYSE: EMR), headquartered in St. Louis, Missouri (United states of america), is a worldwide technologies and computer software business giving modern options for customers in industrial, industrial and residential marketplaces. A chief in industrial automation, Emerson can help system, hybrid and discrete makers optimize operations, protect staff, lower emissions and obtain their sustainability plans via its Automation Answers and AspenTech companies. Emerson’s Professional & Household Options business enterprise helps make sure human consolation and wellbeing, defend foodstuff excellent and basic safety, advance electricity efficiency and create sustainable infrastructure. For a lot more details, visit

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HARDI Distributors Report 16.8% Percent Revenue Increase in July – HVAC Insider

September 06, 2022

Heating, Air-conditioning & Refrigeration Distributors Global (HARDI) launched its month-to-month Tendencies report, displaying the common product sales performance by HARDI distributors was an increase of 16.8% percent in the course of July 2022.

The common once-a-year product sales growth for the 12 months by July 2022 is 24.3% p.c.

“July 2022 experienced 1 considerably less billing day and a tricky climate comp for most locations but continues to reward from the intense price tag raises that have been passed via,” explained HARDI Current market Investigation & Benchmarking Analyst Brian Loftus. “What goes up ought to gradual down and this cycle has obviously peaked. The average once-a-year income progress by contributors has been in the 24% to 25% assortment due to the fact January.”

The Days Sales Remarkable, a measure of how swiftly shoppers pay back their bills, was 40 days at the finish of June 2022. “The June 2022 DSO is similar to June 2020 and 2021. The pre-COVID DSO for June was closer to 45 times,” claimed Loftus.

The occupation market is potent but other leading indicators for our business like Shopper Sentiment, housing permits and current residence sales are not as encouraging. “Inflation has been in the news and in our field also,” stated Loftus. “The yearly boost for the HVACR major products and solutions selling price index has been in the vicinity of 25% due to the fact April and assisting to help distributor’s product sales development.”

HARDI associates do not get economical payment in exchange for their regular income information and can discontinue their participation without the need of prior discover or penalty. Participation is voluntary, and the depth of current market coverage differs from region to area. An unbiased entity collects and compiles the data that can incorporate goods not straight linked with the HVACR marketplace.


HARDI (Heating, Air-conditioning and Refrigeration Distributors Worldwide) is the single voice of wholesale distribution inside the HVACR field. HARDI customers marketplace, distribute, and aid heating, air-conditioning, and refrigeration machines, elements and materials. HARDI Distributor customers serve installation and company/substitution contractors in household and professional marketplaces, as effectively as business/industrial and institutional maintenance staffs. HARDI proudly signifies a lot more than 460 distributor associates representing additional than 5,000 branch destinations, and near to 500 provider, maker consultant and provider vendor customers.

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New Heat Pump Rebates Coming from States – HVAC Insider

August 26, 2022

On August 17, 2022 President Biden signed the Inflation Reduction Act (IRA), a tax, drug-pricing, and climate improve bill handed by the reconciliation method. One of the factors of the IRA is the newly produced Higher-effectiveness Electrical Residence Rebate Software which delivers state electricity workplaces with funds to give low and medium-income homeowners and landlords a rebate of up to $8,000 on qualifying heat pumps and more rebates to update electrical panels, air flow, and household wiring. Although $4.3 billion has been appropriated for the rebate system, it will be up to unique states to make the rebate readily available to residents.

Each and every of the following appliances and upgrades is qualified for rebates if it is accredited by the Electrical power Star system:

  • Heat pump for space heating or cooling: $8,000
  • Warmth pump h2o heater: $1,750
  • Electrical stove, cooktop, range, or oven: $840
  • Electric heat pump dresses dryer: $840
  • Electrical load company middle upgrades: $4,000
  • Insulation, air sealing, and air flow: $1,600
  • Electric wiring: $2,500

In addition to personal rebate constraints for each individual appliance, the rebate is also limited dependent on the income of the home-owner/tenant.

Some states have previously applied insurance policies to stimulate gas-switching though some others have prohibited it generating implementation of the rebate probable to be uneven throughout states.

Learn more about the warmth pump rebate listed here.

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