Recent developments indicate that CO2 and NH3 are the most promising refrigerants for future heat pumps. Today two high‐pressure compressor technologies are offered with an attractive combination of high delivery temperature and high COP which is ideal for district heating purposes: CO2 (carbon‐dioxide/R744) transcritical piston‐compressor heat pumps and new NH3 (ammonia/R717) heat pumps using Vilter’s single‐screw compressor. Also the twin‐
Recent developments indicate that CO2 and NH3 are the most promising refrigerants for future heat pumps. Today two high‐pressure compressor technologies are offered with an attractive combination of high delivery temperature and high COP which is ideal for district heating purposes: CO2 (carbon‐dioxide/R744) transcritical piston‐compressor heat pumps and new NH3 (ammonia/R717) heat pumps using Vilter’s single‐screw compressor. Also the twin‐screw compressor technology using NH3 is under strong development and is expected to be introduced within a short term (Brædstrup Totalenergianlæg A/S, Vildbjerg tekniske værker et al. 2011). In Denmark CO2 compressor heat pumps have been installed in Frederikshavn and Marstal in combination with a CHP plant and a high‐temperature NH3 single‐screw heat pump is under construction in Drammen in Norway (Nielsen 2011). But as the technology is still rather new, experiences about efficiencies and dependability is still to come.
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By Colmac Coil manufacturing Inc. , published Mar 17, 2016 - 23 pages
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