Theoretical study on a frost-free household refrigerator-freezer |
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| Affiliation: | 1. Department of Energy, Politecnico di Torino, Turin 10129, Italy;2. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore;3. DENSO Thermal Systems/Technical European Centre, Poirino 10046, Italy;1. Saad Dahleb University, 9000 Blida, Algeria;2. Unité de Développement des Equipements Solaires, UDES, Centre de Développement des Energies Renouvelables, CDER, 42004 Tipaza, Algeria;3. Industrial Technologies Department, University of Applied Sciences Western Switzerland, CH 1400 Yverdon-les-Bains, Switzerland;1. Renewable Energy and Energy Efficiency Group, Department of Infrastructure Engineering, Melbourne School of Engineering, The University of Melbourne, VIC 3010, Australia;2. Statistical Consulting Centre, The University of Melbourne, VIC 3010, Australia |
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| Abstract: | This study deals with a frost-free household refrigerator-freezer, in which frosting can be retarded by dehumidifying the air before it enters the evaporator of the refrigerator-freezer via a desiccant-coated heat exchanger. Because the desiccant can be regenerated via the condensation heat of the refrigerant (which is exhausted into ambient air in conventional household refrigerator-freezers), the proposed system can achieve high energy efficiency. Calculations show that the coefficient of performance of this system (COP) is within the range 1.5–2.5 at an ambient temperature of 15–35 °C. Moreover, it is found that the relative humidity of the refrigerator air (RHRA) and the temperature of freezer air (TFA) have a significant effect on COP: COP decreases by about 13% when RHRA varies from 0.4 to 0.8 and by 10% when TFA runs from ?18 to ?23 °C. |
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