Screw Compressors for Heat Pump Application

Recent Status of Trochoidal Type Compressors for Heat Pumps in Germany

The development of trochoidal type heat pu mp compressors will be discussed. Evaluating the the oretical design parameters advantages and disadvantage s of various principal versions of those machines will b e considered in detail. Based on this consideration the hardware development of some trochoidal type compres sors will be described as has been made in various Germa n companies. Finally th...

Application of Trunk Piston Labyrinth Compressors in Refrigeration and Heat Pump Cycles

Extending the Operation Range of Dry Screw Compressors by Cooling Their Rotors

Dry screw compressor are limited to maximum pressure ratios of approximately 3:1 due to the high gas temperatures resulting from the compression process, which cause them to deform To attain higher pressure ratios the compressors must be cooled. The main features of heat transfer in screw compressors are reviewed qualitatively and resulting from this, an analytical and experimental study was ca...

Heat Transfer in Oil-Flooded Screw Compressors

Thermodynamic efficiency of the compression process in oil-flooded screw compressors depends greatly on the oil-gas heat transfer process. The amount of heat transfer is a function of many parameters such as mode of oil injection, oil inlet temperature, etc. This paper describes a mathematical model to calculate this heat transfer, assuming that the oil is injected in the form of non-interactin...

Screw Compressor: a Strong Link in the Development Chain

In any development, screw compressor has several prominent roles. One is its unavoidable application in infrastructure building of the road and railway networks, as well as in major housing developments. Other roles are introduction of new compressor manufacturing facilities and a consequential improvement of the existing compressor industry in which the screw compressor has a vital part as an ...