Iranian Society of Heating, Refrigerating, and Air Conditioning Engineers (IRSHRAE) Journal of Renewable and New Energy 2423-4931 5 1 2018 08 23 Effect of design parameters on thermal efficiency of a flat plate solar collector Effect of design parameters on thermal efficiency of a flat plate solar collector 1 8 68490 FA Farzad Jafarkazemi Mechanical Engineering Department, Technical Faculty, South Tehran Branch, Islamic Azad University 0000-0002-8840-3810 Aash Asadzadeh Zargar Mechanical Engineering Department, Technical Faculty, South Tehran Branch, Islamic Azad University Journal Article 2017 08 08 It is the aim of this paper to determine the parameters affecting thermal performance of flat plate solar collectors. As a first step, theoretical models for different configurations of a flat plate collector are introduced. These include riser tubes below the absorber plate, tubes above the absorber and tube in between. <br />A comparison is then made between the theoretical results and real experiments which were implemented in solar energy laboratory at South Tehran Branch of Islamic Azad University. <br />According to the results, the maximum absorbed energy is for the case where tubes are below the absorber plate. Decreasing the distance between the riser tubes, applying low emissivity glass and increasing insulation thickness are among the parameters which increase collector thermal efficiency. <br />In addition, decreasing the pressure of the gas between the absorber plate and collector glazing increase collector efficiency. Insulation material and working fluid also affect the collector thermal efficiency. It is the aim of this paper to determine the parameters affecting thermal performance of flat plate solar collectors. As a first step, theoretical models for different configurations of a flat plate collector are introduced. These include riser tubes below the absorber plate, tubes above the absorber and tube in between. <br />A comparison is then made between the theoretical results and real experiments which were implemented in solar energy laboratory at South Tehran Branch of Islamic Azad University. <br />According to the results, the maximum absorbed energy is for the case where tubes are below the absorber plate. Decreasing the distance between the riser tubes, applying low emissivity glass and increasing insulation thickness are among the parameters which increase collector thermal efficiency. <br />In addition, decreasing the pressure of the gas between the absorber plate and collector glazing increase collector efficiency. Insulation material and working fluid also affect the collector thermal efficiency. https://www.jrenew.ir/article_68490_05de265b83af799ad4f6753aff62d1ee.pdf