Investigation of an automobile air-conditioner with a liquid-suction heat exchanger using R134a and R1234yf

Mohammed, Ansam Akeel; Sarsam, Wail S.

doi:10.30772/qjes.2023.143262.1030

	Investigation of an automobile air-conditioner with a liquid-suction heat exchanger using R134a and R1234yf
Al-Qadisiyah Journal for Engineering Sciences
Article 9, Volume 17, Issue 1, March 2024, Pages 66-76 PDF (624.92 K)
Document Type: Research Paper
DOI: 10.30772/qjes.2023.143262.1030
Authors
Ansam Akeel Mohammed^* ; Wail S. Sarsam
Department of Mechanical Engineering, Collage of Engineering, University of Baghdad, 10071 Baghdad, Iraq
Abstract
Air-conditioning systems (ACs) are essential in hot and humid climates to ensure acceptable ambient air quality as well as thermal comfort for buildings users. It is essential to improve refrigeration system performance without increasing the effects of global warming potential (GWP) and ozone depletion potential (ODP). The main objective of this study is to evaluate the performance of an air conditioning system that operates with a liquid suction heat exchanger (LSHX) through implementing refrigerants with zero OPD and low GWP (i.e., R134a and R1234yf). Liquid suction heat exchanger (LSHX) was added to an automobile air conditioning system (AACS).When Liquid suction heat exchanger was added to the cycle, primary results indicated that an enhancement in the cycle coefficient performance (COP) by 25.2 %and 17.3% for R134a and R1234yf respectively, and decreasing in mass flow rate of the refrigerants used (m ̇_r). Also increasing in refrigeration effect (RE) by 4.2% and 2.3% for R134a and R1234yf respectively. Presence of LSHX caused increasing in heat rejected by condenser (Qcond.) according to increasing in sub-cooling degree and decreasing in compressor work (Wcomp.), increasing in condenser exergy destruction (X. des. cond.) and thermostatic expansion device (TXV) exergy destruction, but decreasing in compressor and evaporator. Summary of previous experimental and numerical studies is presented as well.
Keywords
Refrigeration; R134a and R1234yf; Heat exchanger; ANSYS; Vapor compression; Coefficient of performance

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