Advanced Research Journals of Science and Technology
ADVANCED RESEARCH JOURNALS OF SCIENCE AND TECHNOLOGY
(ARJST)
Performance Analysis of Domestic Refrigerator With and Without Heat Recovering Unit by using R134a and R600a
2349-9027
Jose Philip1, S.N.CH.Dattu2, V.V Kamesh3 1 Research Scholar, Department of Thermal Engineering,Aditya Engineering College, Surampalem, Andra Pradesh, India. 2 Associate Professor,Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India. 3 Associate Professor,Department of Mechanical Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India.
Abstract This project presents a study of using different environment friendly refrigerants with zero ozone depletion potential (ODP) and minor global warming potential (GWP), to replace R134a in domestic refrigerator and waste heat recovery from condenser. This work consists of using a hydrocarbon gas mixture which does not deplete ozone layer is ecofriendly, and can be used in the commonly used refrigerators without any significant change in the system of domestic refrigerator. A house hold refrigerator designed to work with R134a was used as an investigation unit to assess the panorama of using R600a refrigerants without any modifications. The recital of the refrigerator using R600a refrigerant was investigated and a compared with the performance of refrigerator when R134a was used as refrigerant. The effect of condenser temperature and evaporator temperature on COP, refrigerating effect was investigated by using both the refrigerants. The energy consumption of the refrigerator during experiment with R600a refrigerant and R134a was measured by using energy meter. The outcome shows the permanent running and cycling results showed that R134a with a charge of 100g or R600a refrigerant with charge of 100mg or more satisfy the required freezer air temperature of -12oC. The main objective of this paper is to study “waste heat recovery system for domestic refrigerator”. An attempt has been made to utilize waste heat from condenser of refrigerator to heat water. This heat can be used for number domestic and industrial purposes. In minimum constructional, maintenance and running cost, this system is much useful for domestic purpose like heating water, heating room, etc. It is valuable alternative approach to improve overall efficiency and reuse the waste heat. The study has shown that such a system is technically feasible and economically viable and also testingtheperformancewithandwithoutheatrecovering unit.
*Corresponding Author: Jose Philip, Research Scholar, Department of Thermal Engineering, Aditya Engineering College, Surampalem, Andra Pradesh, India. Published: December 19, 2015 Review Type: peer reviewed Volume: II, Issue : II Citation: Jose Philip,Research Scholar (2015) Performance Analysis of Domestic Refrigerator With and Without Heat Recovering Unit by using R134a and R600a
INTRODUCTION Heat is energy, so energy saving is one of the key matters from view point of fuel consumption and for the protection of global environment for our future usage. So it is necessary that a significant and concrete effort should be made for conserving energy through waste heat recovery from different machineries. The main objective of this paper is to study “Waste Heat recovery system for domestic refrigerator and performance of refrigerator by using environmental friendly refrigerant”. An attempt has been made to utilize waste heat from condenser of refrigerator to heat water. A domestic refrigerator is a common household Appliance that consists of a thermally insulated compartment and which when works, transfers heat from the inside of the compartment to its external atmosphere so that the inside of the thermally insulated compartment is cooled to a temperature below the ambient temperature of the room. Heat rejection may occur directly to the air in the case of a conventional household refrigerator
having air-cooled condenser or to water in the case of a water-cooled condenser. Tetrafluoroethane (HFC134a) refrigerant was now widely used in most of the domestic refrigerators as the working fluid. THEORY OF REFRIGERATION SYSTEM It has been mentioned before that the refrigeration is defined as the process of removal of heat from a region or state or a substance to reduce and maintain its low temperature and transferring that heat to another region, state or substance at higher temperature by the help of refrigerant which one known as working fluid. The refrigeration process that employed in the domestic refrigerator is based on a vapor compression cycle as shown in Figure 2 and collaborated with Figure 1. There are three main parameter that were considered in this study; compressor power, refrigeration capacity and coefficient of performance (COP).
P-h diagram of vapor compression cycle
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