- Author
-
Payne, W. V.
|
Domanski, P. A.
|
Muller, J.
- Title
- Study of a Water-to-Water Heat Pump Using Flammable Refrigerants.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Technical University of Cracow, Poland
- Book or Conf
- Natural Working Fluids '98 IIR-Gustav Lorentzen Conference. IIF-IIR Sections B and E. Proceedings. June 2-5, 1998,
Oslo, Norway,
1998
- Keywords
-
heat pumps
|
refrigerants
|
brazed plate heat exchangers
|
entropic average
|
hydrocarbons
|
water-to-water heat pumps
|
zeotropic
- Abstract
- This investigation compared the performance of R22 to the performance of R290 and that of flammable zeotropic mixtures, R32/290 and R32/152a. The tests were conducted in a test apparatus specially designed to simulate a residential water-to-water heat pump. Brazed plate heat exchangers used as the evaporator and condenser allowed for counter-flow heat transfer between the refrigerant and indoor-loop and outdoor-loop heat-transfer fluids. The performance of the system was characterized by air-side capacity and Coefficient of Performance (COP) at different compressor speeds. Performance comparisons at a constant capacity were also provided. In the cooling mode at a constant-capacity, the R32/290 (50/50) mixture produced the highest COP; 8% higher than R22. In the heating mode, the COP of R290 was the highest; from 6% to 8% higher than that of the remaining fluids. The cooling COP of R32/290 was 13% lower and the heating COP of R290 was 1% higher than the respective COPs of R22 in the reference water-to-air system.