THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL STUDY ON QUASI-TWO-STAGE COMPRESSION HEAT PUMP AIR CONDITIONING SYSTEM FOR PURE ELECTRIC BUS

ABSTRACT
In response to the challenge of achieving efficient low temperature heating performance in heat pump air conditioning systems for pure electric buses, a quasi-two-stage compression heat pump air conditioning system incorporating fully micro-channel technology is developed. A series of experimental studies were conducted to investigate the influence of different compressor speeds and fan frequencies on system performance, resulting in corresponding performance curves. In a low temperature environment of -10°C, the compressor exhaust temperature is maintained at 44.34°C. Concurrently, the system heat exchange capacity is enhanced by 11.3% to 47% compared to the non-supplemented air system. Moreover, at a compressor speed of 4000 rpm, the system COP was found to be 2.72. The implementation of variable frequency compressor speed and fan frequency in the pure electric bus heat pump system has resulted in enhanced system performance, leading to energy savings.
KEYWORDS
PAPER SUBMITTED: 2024-05-16
PAPER REVISED: 2024-07-07
PAPER ACCEPTED: 2024-07-07
PUBLISHED ONLINE: 2025-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI2503981Z
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 3, PAGES [1981 - 1989]
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2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence