International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
www.irjet.net
Hot and Cold Storage using Waste Heat Recovery System Vedant Borawake1, Tanmay Dixit2, Ojas Chitale3 1Student of B.E., Department of Mechanical Engineering, PVG’s COET & GKPWIOM, Pune 411009, Maharashtra,
India
2Student of B.E., Department of Mechanical Engineering, PVG’s COET & GKPWIOM, Pune 411009, Maharashtra,
India
3Student of B.E., Department of Mechanical Engineering, PVG’s COET & GKPWIOM, Pune 411009, Maharashtra,
India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract -In the present era, the world is grappling with
harness and utilize this energy for sustainable applications. By harnessing the waste heat produced by refrigeration systems, our objective is to contribute to the development of more energy-efficient and environmentally friendly cooling and heating solutions. This paper examines the underlying principles, challenges, and potential benefits associated with this innovative approach, shedding light on its viability and broader implications for a greener future.
a significant energy crisis, necessitating the adoption of energy-efficient practices in all areas of life. Given that heat is a form of energy, it becomes crucial to prioritize energy conservation, especially concerning the use of refrigerants, to safeguard the global environment. The dissipation of waste heat contributes to adverse environmental conditions, such as global warming and ozone layer depletion. Therefore, it becomes imperative to make substantial and tangible efforts toward conserving energy through waste heat recovery. In this regard, an endeavor has been undertaken to harness the waste heat emitted from refrigerator condensers. This captured heat holds potential for various domestic and industrial applications. With low construction, maintenance, and operational costs, this system proves highly beneficial for domestic purposes. It serves as a valuable alternative approach to enhance overall efficiency and repurpose waste heat. The feasibility study indicates the technical and economic viability of this system, wherein a simple refrigerator is equipped with a compartment, positioned beneath the freezer, designed to capture heat emitted by the condenser coils. This compartment can be utilized for hot storage, while the refrigerator continues to function conventionally. Moreover, there is room for further improvement in the coefficient of performance (COP). Preliminary calculations indicate that a hot box temperature of approximately 35°C-40°C can be generated without consuming additional electric power by harnessing the recovered heat from a domestic refrigerator.
1.1 Principle of VCC in household refrigerator The Vapor Compression Cycle (VCC) is commonly used in household refrigerators to transfer heat from a low temperature to a high temperature environment. The primary purpose of a refrigerator is to remove heat from a low-temperature medium. During the operation of a household refrigerator, heat is rejected to the surrounding environment from the condenser. Unfortunately, in warm climates, this heat is typically wasted. This paper explores the feasibility of a new system that utilizes the rejected heat from the refrigerator's condenser to create hot storage. The objective is to investigate the utilization of waste heat from the condenser within the same system where the refrigeration process takes place. The thermodynamic cycle of the refrigeration system involves controlling heating and cooling in storage. The cycle begins with the compressor, which receives vaporized refrigerant and compresses it. The compressed vapor exits the compressor as superheated vapor, which then passes through the condenser. In the condenser, the superheated vapor cools down and releases heat, causing it to condense into a liquid. Additional heat, pressure, and temperature are removed from the liquid refrigerant by a fan blowing across the condenser coil.
Key Words: Waste heat, Overall efficiency, Refrigerator, Energy conservation, Condenser
1.INTRODUCTION Energy efficiency and sustainability have emerged as crucial considerations in today's society, given the increasing demand for cooling and heating systems. In order to maximize energy utilization and minimize waste, it has become essential to explore innovative approaches. One promising avenue is the utilization of waste heat generated by domestic refrigerators, which typically goes unused and dissipates into the environment. This research paper focuses on the concept of utilizing waste heat for hot and cold storage, presenting a unique method to
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The warm air in the hot room passes through the condenser coil, becoming heated in the process. This heat is absorbed by the products stored in the hot room. The liquid refrigerant then flows through the expansion valve, where a sudden pressure drop leads to flash evaporation. The resulting cold liquid-vapor mixture travels through the evaporation coil, where it is vaporized by the warm air cooled by a fan across the evaporation
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