Optimal refrigerant mixture in single-stage high-temperature heat pumps based on a multiparameter evaluation

Refrigerant Circuit Optimization of Dual-mode Single-Row Microchannel Heat Exchangers used for R410A Heat Pumps

Microchannel heat exchangers (MCHX) are being increasingly applied in heat pumps because of their compactness, significant charge reduction, lower refrigerant pressure drop and lower air-side fan power consumption compared to traditional round tube-plate fin (RTPF) heat exchangers. Using a microchannel condenser as well as evaporator in a heat pump system also offers significant potential for c...

Experimental Study on the Heat Transfer Performance of a Zeotropic Refrigerant Mixture in Horizontal Tubes

In the present study, the condensation and evaporation heat transfer performance of a zeotropic refrigerant mixture (HFC32/HFC125/HFC134a) inside horizontal tubes with smooth, grooved or cross·grooved inner surfaces was investigated experimentally. The cross-gTOoved tube showed the highest heat transfer coefficient for both condensation and evaporation with the zeotropic mixture. Its heat trans...

Performance Evaluation of a Two-Stage Compression Heat Pump System With Refrigerant Charge and EEV Opening

a study on corrosion reasons of heat exchanger in ammonia unit

چکیده ندارد.

High Efficiency Compressor-Condenser in a Single Hermetic Component for Heat Pumps

A unit that encloses a motor-compressor and a condenser of refrigerant fluid in a single hermetic casing is presented. After a description of the general advantages of the component compared with the traditional solution, as far as weight, size, cost and very low noise emission are concerned, experimental test results are presented. COP values in different working conditions show that a good en...