Air-Source Heat Pumps / Refrigeration

CO2 Use Grows in North America

One measure of the impact of CO2 as a refrigerant comes with the increasing number of applications in North America, where its use can be stymied with questions related to codes and regulations in municipalities as well as the learning curve of installation and service technicians.

But CO2 projects continue to come on line, and that is expected to increase with the recent announcement of UL listing of CO2 as a refrigerant.

According to several industry sources, here are some of the most recent projects.


One instance was the integration of a CO2 heating and cooling system in a winery in California, where a CO2 heat pump by Mayekawa/Mycom made its U.S. debut.

The system features an electric-driven hot water heat pump that uses CO2 refrigerant for glycol cooling and hot water heating. The winery required 180˚F supply hot water.

Some of the findings, according to a report made by Mark Tomooka of Mayekawa at the ATMOsphere America 2012 conference, were:

• High hot water supply eliminates the use for harsh chemical treatment in wash down;

• Design for off-grid capability;

• System cost is 1.35 times the cost of conventional refrigeration and boiler equipment; and

• Three-year payback.


Commercial bakery Country Maid uses a transcritical CO2 heat pump system that simultaneously produces high-temperature hot water for washing baking equipment and air conditioning for employees. This installation is a joint effort between the commercial bakery and EcoThermics Corp., based in Illinois, which has developed the AT54 CO2 compressor that is sized for the U.S. commercial market.

CO2 in heat pumps, in this instance, produce hot water from 120˚ to 190˚F, well beyond the limits of traditional heat pumps. When the system is designed to provide hot water and air conditioning simultaneously, the combined coefficient of performance (COP) can exceed 5.0.

According to presenters at ATMOsphere America 2012, payback is expected in three years or less. They said exceptional energy efficiency makes the system economically competitive with low-cost natural gas water heating.

Dairy Plants

Dairy plants in Quebec, Canada, owned by Fromagerie Polyethnique and Fromagerie Fritz Kaiser, respectively, recently integrated CO2 heat pumps into their operations.

Fromagerie Polyethnique’s motivation was to reduce energy consumption and be more sustainable. After monitoring energy consumption since 2008, the company committed, in 2012, to improve energy efficiency and reduce waste. In this vein, the company installed a new blast cooler with the CO2 heat pump unit for the cheese plant.

Different temperatures were required during the dairy production process. In the first project at Fromagerie Polyethnique, a Mayekawa/Mycom CO2 heat pump provides hot water for washing and chilled water for the maturing room, milk storage, and storage ice bank.

The use of the CO2 heat pump saves an estimated 105,000 liters of propane fuel each year, officials said.

The yearly energy-savings estimation from the second project at Fromagerie Fritz Kaiser was said to amount to about 125,000 liters of propane. However, the comparison of energy consumption before and after the CO2 heat pump was installed is a difficult one, those involved in the project said, as the project involved expansion of the production capacity. The goal of the project was to expand from handmade-type production to a more industrial version while at the same time reducing operational costs.

The CO2 heat pump unit is also used for pasteurization and production processes. One of the main benefits of the CO2 heat pump unit is that it can achieve the high levels of heat required during the production process. The payback period for the project was estimated at four to five years, but thanks to the energy-efficiency incentives by the Quebec government, the payback period was reduced to two years.


Transcritical CO2 supermarket systems in U.S. supermarkets are trending. At ATMOsphere America 2012, several North American suppliers shared information on CO2 supermarket installations.

Hill Phoenix presenters said the company has 50 secondary CO2 systems installed in North America, more than 25 cascade systems, and recently installed the first transcritical system by Advansor in Vancouver, with additional projects planned in the future. CSC has supplied 18 supermarkets with their ECO2 systems in Canada; and Carnot Refrigeration has supplied five subcritical CO2 supermarket systems, and a total of 23 CO2 transcritical supermarkets in existing or under-construction buildings in North America.

Publication date: 1/14/2013

Did you enjoy this article? Click here to subscribe to The NEWS Magazine

Recent Articles by Peter Powell

You must login or register in order to post a comment.



Image Galleries

2014 World Energy Engineering Congress

Scenes from the 2014 World Energy Engineering Congress in Washington, D.C.


NEWSMakers: Greenheck Mixed Flow Fan, Model EQB

Shane Dock, Application Engineer at Greenheck, will introduce you to Greenheck’s new EQB mixed flow fan. We’ll discuss what the features of the EQB’s innovative design, what kinds of applications can utilize the EQB, and why the EQB is an attractive inline choice for your customers’ projects.  Dock is currently focused on applications regarding inline fans, gravity ventilators, and electrical products. Posted March 4th.



More Podcasts


NEWS 03-02-15 cover

2015 March 2

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

HVAC Trends

The NEWS regularly reports on HVAC industry trends in our weekly issues. What trends do you see?
View Results Poll Archive


2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research


Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


Magazine image
Register today for complete access to Get full access to the latest features, Extra Edition, and more.


facebook icontwitter iconyoutube iconLinkedIn i con