International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 10 | Oct 2024
p-ISSN: 2395-0072
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A REVIEW ON CFD based Thermal Performance Analysis of Earth Air Tube Heat Exchanger System with Water Impregnation Prakash1, Dr. Himanshu Agarwal2, D.S. Mandloe3 1Research Scholar, M. Tech. (Thermal Engg.) 2Professor and Head, Department of Mechanical Engineering 3Assistant Professor, Department of Mechanical Engineering
Jhada Sirha Government Engineering College Jagdalpur, Bastar Chhattisgarh India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This is the characteristic of the earth where
by absorbing heat from the ground for heating or releasing it into the ground for cooling. This innovative use of geothermal energy benefits both heating and cooling inside a building. An earth tube heat exchanger uses a blower to circulate air through the underground loop of pipes, facilitating heat transfer between the air and the ground. This straightforward system reduces both operational costs and electricity consumption by eliminating the need for compressors, condensers, and evaporators, while efficiently harnessing geothermal energy for climate control.
the temperature of the ground is relatively constant yearround at a depth of approximately 1.5 to 2 meters. The term "earth's undisturbed temperature" refers to this steady state of temperature, which is greater in the winter and lower in the summer. The design of the earth-air heat exchanger (EATHE) is necessary for the efficient use of the earth's heat capacity. Buildings can benefit from the use of EATHE as an efficient passive heating and cooling system. This is essentially a network of pipes made of metal, plastic, or concrete that are buried at a specific depth and through which heat-producing fresh air from the atmosphere flows.
1.1 Working Principle of Earth Tube Heat Exchanger (ETHE)
winter and supplying to the building if the temperature is high enough, and vice versa in the summer. Numerous researchers have conducted numerous studies on the planning, modeling, and testing of EATHEs systems to date. Much work has been done over the past two years to create mathematical and analytical models for the analysis of EATHE systems. The CFD analysis of EATHE systems is presented in this review paper study.
1.Introduction
The concept of thermal inertia has been utilized for heating and cooling purposes since ancient times. Before the Christian era, it was utilized by the ancient Greeks and Persians. In more recent times, the Italians created caves for the purpose of precooling and preheating. These days, air travels through underground pipes that are used for either heating, cooling, or both purposes. The temperature of the earth changes from its surface to a fixed depth, where thermal equilibrium takes place. At that point, the temperature of the earth's interior is known as the undisturbed subsoil temperature.
Globally, it is estimated that residential buildings, offices, and commercial spaces account for approximately 40% of total energy consumption and 70% of electricity usage. A significant portion of this energy demand comes from heating and cooling systems in residential, commercial, and industrial sectors. To alleviate the load on active systems that convert renewable energy into thermal or electrical power, the first essential step is to implement an optimal mix of passive design strategies, with passive solar design being one of the most important. Geothermal energy, recognized as a renewable resource, offers a sustainable and endless energy supply.
ETHE is positioned at the temperature-fixation point. The ground temperature surrounding ETHE is higher than ambient air in the winter, so the supply air is warmer during that season. Conversely, in the summer, the ground temperature surrounding ETHE is lower than ambient air, so the supply air is colder. Heat transfer from/to air through ETHE to the ground happens when air enters ETHE. The effectiveness of ETHE determines the efficiency of the heat transfer process from/to air [1]. In 1826, Thomson proposed the first harmonic model to determine the temperature of undisturbed soil; Kelvin then developed this model in the following ways [1].
Key Words: Earth-air heat exchanger, soil characteristics, thermal performance.
Traditional heating and cooling systems rely on components like compressors, condensers, and evaporators. In contrast, an earth tube heat exchanger is a buried heat exchanger that leverages geothermal energy
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