Operating Characteristics of Variable Speed Reciprocating Compressors for Heat Pumps with Specific Reference to the Performance of Their Valves

摘要

The speed control of reciprocating compressors for heat pumps shows striking advantages. Besides the better matching of capacity at partial load operation, especially the better COP and the reduced On/Off-operation have to be mentioned. The valves of modern compressors are slightly too strong for speed-controlled operation. Smaller modifications would bring even better results. Therefore an improvement of COP from 0.5 to 0.8 will be possible. The higher costs for the speed control can already be lowered during the layout of the system, the lower running costs of the heat pump will additionally provide for a quick amortisation. 2 references, 14 figures. (ERA citation 10:018581)