THERMAL SCIENCE

International Scientific Journal

Zhiyong Su

,

Gang Chen

,

Haiyan Zeng

,

Haijun Li

,

Yiwei Yu

,

Yayu Dai

,

Mengqi Xu

,

Xinyu Tang

IMPACT OF THE R407C AND R134YF REFRIGERANT CHARGE ON THE PERFORMANCE OF A NEW PURE ELECTRIC VEHICLE HEAT PUMP AIR CONDITIONING SYSTEM

ABSTRACT
The objective of this study was to investigate the impact of varying refrigerant charge levels of R407c and R134yf on the refrigeration performance of a vehicle heat pump air conditioning system. The study was conducted under high temperature conditions (45°C) to assess the influence of different refrigerant systems on refrigeration performance parameters. The results demonstrated that the optimal refrigerant charge level can be determined by analyzing the change in refrigeration performance parameters with varying charge levels. The results indicated that an increase in the refrigerant charge of R407c from 2.3 kg to 2.6 kg resulted in a maximum cooling capacity and COP of the system reaching 4.935 kW and 2.1, respectively. The optimal charging capacity of the system was determined to be 2.5 kg. Similarly, an increase in the refrigerant charging capacity of R134yf from 2.3 kg to 3.5 kg resulted in a maximum cooling capacity and COP of the system reaching 5.08 kW and 2.71, respectively. The optimal charging capacity of the system was determined to be 2.9 kg. The COP of the R134yf system is 0.61 higher than that of the R407c system. Furthermore, the energy saving of the R134yf system is more pronounced under extreme conditions.
KEYWORDS
heat pump air conditioner, low pressure tonic, R134yf, R407c, optimal filling amount
PAPER SUBMITTED: 2023-12-12
PAPER REVISED: 2024-05-16
PAPER ACCEPTED: 2024-05-17
PUBLISHED ONLINE: 2025-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI2503943S
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 3, PAGES [1943 - 1950]
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Impact of the R407C and R134yf refrigerant charge on the performance of a new pure electric vehicle heat pump air conditioning system

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