Refrigerant charge reduction in R600a domestic refrigerator-freezer by optimizing hot-wall condenser geometry
- Authors
- Cho, Wonhee; Jang, Dong Soo; Lee, Sang Hun; Yun, Sungho; Kim, Yongchan
- Issue Date
- 9월-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Transient simulation; Refrigerant charge; Hot-wall condenser; Refrigerator-freezer
- Citation
- INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, v.117, pp.295 - 306
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID
- Volume
- 117
- Start Page
- 295
- End Page
- 306
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/53653
- DOI
- 10.1016/j.ijrefrig.2020.05.012
- ISSN
- 0140-7007
- Abstract
- The objective of this study is to investigate the effects of hot-wall condenser geometry on domestic refrigerator-freezers (RFs) in terms of refrigerant charge reduction. A transient simulation model for an R600a domestic RF is developed and validated to capture the dynamic performance at various operating conditions. The hot-wall condenser in the domestic RF is determined to store excess refrigerant charge. The effects of the hot-wall condenser geometry on the performance of the RF are analyzed according to the total refrigerant charge. The coefficient of performance (COP) decreases with decreasing hot-wall condenser length and diameter; however, the decrease in the COP of the RF is compensated by the decreased energy consumption. Based on the global minimum energy consumption, the optimum hot-wall condenser design is achieved when the tube length is reduced to 70% of its original size and the tube outer diameter is decreased to 3.75 mm. Furthermore, the total refrigerant charge in the RF corresponding to the optimized hot-wall condenser geometry is shown to be 14% lower compared to the rated charge amount. (C) 2020 Elsevier Ltd and IIR. All rights reserved.
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