Refrigerant charge reduction in R600a domestic refrigerator-freezer by optimizing hot-wall condenser geometry | |
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Year of publication | 2020 |
Title of paper | Refrigerant charge reduction in R600a domestic refrigerator-freezer by optimizing hot-wall condenser geometry |
Author | Wonhee Cho, DongSoo Jang, SangHun Lee, Sungho Yun, Yongchan Kim |
Publication in journal | International Journal of Refrigeration |
Publication date | September 2020 |
Volume & other data | Volume 117, 295306 |
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 de- creased 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. |
Keywords | Refrigerator-freezer, Transient simulation, Refrigerant charge, Hot-wall condenser |
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HVAC
고려대학교 냉동공조 및 이상유동 연구실