THERMAL SCIENCE

International Scientific Journal

Yu Hu

,

Xiaolin Sun

,

Jinfeng Wang

,

Jianguo Zhang

,

Zhigang Zhou

INFLUENCE OF FEED FLOW RATE AND FEED CONCENTRATION ON THE AMMONIA ABSORPTION REFRIGERATION SYSTEM

ABSTRACT
The absorption refrigeration system is a type of heat-driven system. The working pairs used most commonly are the lithium bromide-water and the ammonia-water pairs. Compared to the lithium bromide-water pair, the ammonia-water pair can achieve lower evaporation temperature and has a wider range of applications in industry. Feed flow rate and feed concentration are key factors affecting the system’s performance, which have significant effects on the ammonia concentration and flow rate at the outlet of the distillationwer, as well as the COP of the system. In this paper, the relationship between feed concentration, feed flow rate, and system performance is investigated by numerical simulation and experimental study. The results show that increased feed concentration can effectively improve the ammonia concentration at the outlet of the distillationwer. At the same time, there is an optimal feed flow rate in the system, and when the feed flow rate rises gradually to the optimal value, the COP of the system also increases. When the feed flow rate exceeds the optimal value, the ammonia concentration at the outlet of the distillationwer will be rapidly reduced, as well as the COP of the system.
KEYWORDS
ammonia-water absorption refrigeration, simulation, feed flow rate, feed concentration
PAPER SUBMITTED: 2024-11-02
PAPER REVISED: 2024-12-30
PAPER ACCEPTED: 2025-01-06
PUBLISHED ONLINE: 2025-02-16
DOI REFERENCE: https://doi.org/10.2298/TSCI241102020H
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE No. 6, PAGES [4587 - 4598]
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Influence of feed flow rate and feed concentration on the ammonia absorption refrigeration system

© 2026 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