FEATURES OF PROCESSES HEAT PUMPS WITH CENTRIFUGAL COMPRESSORS WORKING WITH THE LOW AND MEDIUM HEAT PERFORMANCE

The paper reviews the findings of the study on the process and parameters related to choosing different working fluids for heat pumps, as well as the peculiarities of the performance of heat exchangers in low and medium-capacity pump units whose parameters lie in the range of 1-2 MW and below individual and industrial heat or less supply systems. We have described motor- and steam turbine- driven heat pumps utilizing refrigerant vapors with a combined cycle. The focus was on the operating conditions such as, the high thermal tension rate of the flow in condensers, reaching up to 17000-23000 W/m2, and the heat transfer in the boiling and condensatioin stages. The paper includes recommendations for selecting the heat exchange parameters at the top and bottom temperature levels in condensers and evaporators. The operating specifics of heat exchangers sunder application of low-boiling refrigerants ( – halo carbons). We have made recommendations for using shell- and- tube-type vaporizers and condensers with surface ribbing of copper tubes with a special burnishing treatment.