The influence of refrigerant (R32) flow maldistribution on the thermal performance of a microchannel heat exchanger without considering superheat and sub-cool / Chng Ming Hui, Chin Wai Meng and Tang Sai Hong

Chng, Ming Hui and Chin, Wai Meng and Tang, Sai Hong (2017) The influence of refrigerant (R32) flow maldistribution on the thermal performance of a microchannel heat exchanger without considering superheat and sub-cool / Chng Ming Hui, Chin Wai Meng and Tang Sai Hong. Journal of Mechanical Engineering, 14 (2). pp. 149-166. ISSN 1823-5514

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Abstract

The research work reported in this paper investigates the numerical study on the influence of statistical moments of probability density function of R32 tube-side flow maldistribution on the thermal performance of microchannel heat exchanger. A model without considering superheat and sub-cool was developed to analyze the effect of mean, standard deviation and skew of the refrigerant maldistribution profile on the heating capacity degradation of the heat exchanger. Next, the performance degradation of microchannel heat exchanger due to refrigerant (R32) maldistribution was quantified and analyzed. After that, the model was validated by doing experiment. Finally, a performance deterioration correlation related to refrigerant maldistribution without considering superheat and sub-cool was developed to offer a faster and simpler method to analyze the maldistribution problem. It is found that mean and standard deviation have the highest impact on the performance deterioration. Maldistribution with high standard deviation and high negative skew gives a large magnitude of performance deterioration. For standard deviation more than 0.3, the deterioration can up to 1%. Besides that, the deterioration reaches 1% for skew below -0.5. Furthermore, the deterioration is as high as 4% when the mean is less than 0.9. Hence, the first three moments such as mean, standard deviation and skew should be optimized in the effort of improve the thermal performance of the heat exchanger. The proposed correlation in this work offers a faster and simpler method for a quick estimate of the degradation factor.

Item Type: Article
Creators:
CreatorsEmail
Chng, Ming HuiUNSPECIFIED
Chin, Wai MengUNSPECIFIED
Tang, Sai HongUNSPECIFIED
Subjects: Q Science > QC Physics > Heat > Thermodynamics
Q Science > QC Physics > Heat > Thermal conductivity
Divisions: Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering
ISSN: 1823-5514
Volume: 14
Number: 2
Page Range: pp. 149-166
Item ID: 21118
Uncontrolled Keywords: Refrigerant (R32) flow; Thermal performance; heat exchanger; superheat and sub-cool
Last Modified: 24 Oct 2018 02:16
Depositing User: Staf Pendigitalan 5
URI: http://ir.uitm.edu.my/id/eprint/21118

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