Study of a Water-to-Water Heat Pump Using Hydrocarbon and Hydrofluorocarbon211 Zeotropic Mixtures

摘要

This investigation compared the performance of R22 to the performance of propane211u001e(R290) and zeotropic mixtures of HFC's and hydrocarbons in a water-to-water heat 211u001epump. Baseline testing began with R22 and proceeded to R290, R32/290, R32/152a, 211u001eand R290/600a. The use of brazed plate heat exchangers arranged in counterflow 211u001efor both heating and cooling allowed glide matching using the zeotropic 211u001erefrigerant mixtures. The performance of the system was characterized by air-side 211u001ecapacity, air-side Coefficient of Performance (COP), compressor RPM, and 211u001erefrigerant conditions.