ENERGY GENERATION, ELECTRIC ENGINEERING AND ELECTROMECHANICS

Isoentropic Efficiency of the Air-to-Air Heat Pump Compressor

Authors

D. V. Stepanov
Vinnytsia National Technical University ROR
N. V. Rezyden
Vinnytsia National Technical University ROR
D. M. Rezyden
Vinnytsia National Technical University ROR
DOI https://doi.org/10.31649/1997-9266-2026-184-1-55-60

Keywords

air-to-air heat pump energy efficiency assessment methodology conversion coefficient isentropic efficiency

Abstract

It is noted that the problem of energy-efficient heat supply in winter and air conditioning in summer is one of the key problems in the global energy sector, as this industry consumes more than half of primary energy resources. Under such conditions, air-source reversible heat pumps are considered as a promising solution for residential and commercial buildings due to their versatility, high energy efficiency, and use of a renewable energy source – the heat of atmospheric air.

Since the key indicator of the efficiency of a heat pump is the conversion coefficient, it becomes important to reliably determine the isentropic efficiency of the compressor, which significantly affects the consumption of electrical energy and the thermodynamic performance of the cycle. In real operating conditions, the compressor operates at variable loads, pressures, and temperatures, which makes it impossible to use a constant value of isentropic efficiency for a correct assessment of the energy characteristics of the system. Factors that affect the isentropic efficiency of the heat pump compressor are analyzed.

The article presents an experimental stand and a methodology for determining the energy efficiency of an air-to-air heat pump, taking into account the energy consumption of the fans of the indoor and outdoor units. Based on the measured values of pressures and temperatures of the refrigerant R410a and air in the evaporator and condenser, experimental data on the isentropic efficiency of the rotary compressor of the reversible air-to-air heat pump were obtained. A comparison of the obtained results with polynomial correlations published by other authors was carried out, it allowed to establish that these polynomial models have a satisfactory correspondence to the obtained experimental results, but the accuracy of the model depends on the type of refrigerant, compressor design, and operating conditions.

160 64

How to Cite

[1]
“Isoentropic Efficiency of the Air-to-Air Heat Pump Compressor”, Вісник ВПІ, no. 1, pp. 55–60, Feb. 2026, doi: 10.31649/1997-9266-2026-184-1-55-60.

Author Biographies

D. V. Stepanov, Vinnytsia National Technical University

Cand. Sc. (Eng.), Assistant Professor, Head of the Chair of Thermal Power Engineering

N. V. Rezyden, Vinnytsia National Technical University

Cand. Sc. (Eng.), Assistant Professor, Assistant Professor of the Chair of Thermal Power Engineering

D. M. Rezyden, Vinnytsia National Technical University

Post-Graduate Student the Chair of Thermal Power Engineering

References

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