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ANIL KUMAR Numerical Investigation of Roughened Solar Air Heater


The ever increasing demand of useful energy and depletion of conventional energy resources give rise to highly energy efficient and compact thermal systems. Solar energy is the foremost source of unconventional energy which has adequate potential to fulfill all energy needs of the modern world.decades, more attention is being focused towards performance up gradation of energy exchange devices utilized in solar energy collection and storage systems. Flat plate solar collector is undeniably one of the simplest and inexpensive types of heat exchanger widely used for air heating applications. Solar air heater utilizes solar insolation to heat up the absorber plate which transfers heat to the air flowing through the system mainly by convection. The low heat transfer coefficient between heated surface and air impedes the heat transfer to the flowing air, thereby, adversely affecting thermal performance of the system.Application of artificial roughness on underside of absorber surface has been found to be effective technique to improve thermo hydraulic performance of solar air heaters.

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Hitesh Panchal Investigation on Performance Analysis of Double Pass Solar Air Heater


Solar air heating is a solar thermal technology in which the energy from the sun, solar insolation, is captured by an absorbing medium and used to heat air.Solar air heating is a renewable energy heating technology used to heat or condition air for buildings or process heat applications. It is typically the most cost-effective out of all the solar technologies, especially in commercial and industrial applications, and it addresses the largest usage of building energy in heating climates, which is space heating and industrial process heating. People from all around the world working on double pass solar air heater due to its higher efficiency. In this research work, comparison is made between modified design of double pass solar air heater with conventional solar air heater with different mass flow rate and air velocity in identical climate conditions. From the research it is found that, modified design of solar air heater is quite efficient compared with conventional double pass solar air heater.

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