A multitude of pathways towards expanding the market for CO2 in heat pumps in America were discussed at a session dedicated to heat pump technology case studies at ATMOsphere America conference on natural refrigerants in San Francisco, 18-19 July 2014: Direct exchange geothermal design, integrated heating and cooling with water source CO2 heat pumps, the design of heat exchangers for heat recovery, as well as progress towards introducing a CO2 heat pump water hea
R744 allows us to do a direct exchange design, because if you think about inserting synthetic refrigerants in and out of the ground there are a couple of problems, one is the cost, as the size of the charge gets larger - it is 10-fold more expensive than CO2” noted Marc Portnoff. “Our oil management allows to separate the compressor oil from the refrigerant at the compressor skid, so we do not have to worry about compressor oil going into the ground heat exchanger. The other thing that R744 allows us to do is to design smaller diameter ground loops… The smaller diameter allows us to have much greater design flexibility in how we install the ground heat exchanger”.
We think we have a play here. We are not going to eliminate the market barriers for geothermal. We have a play by improving performance because CO2 is an excellent refrigerant in this environment and by reducing the cost of installation so that the return on investment increases. Our goal is with our partners, that we will over time increase the market share from 1-2% in the HVAC market to 10%”, Marc Portnoff concluded.
If electricity costs 10 cents per kilowatt hour and the average electricity use is 3,000 kilowatt hours, the average annual savings are $200”, noted Ken Eklund. “If the system is used as a combination space and water heater the savings increase to over $1,000 per year.”
That E-mail already exists on our list !