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PROCESSES OF HEAT EXCHANGE IN A PLANAR SOLAR ENERGY COLLECTOR

Journal: Academic Journal "Industrial Machine Building, Civil Engineering" (Vol.3, No. 45)

Publication Date:

Authors : ; ; ;

Page : 256-264

Keywords : solar energy collector; heated air; heat balance.;

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Abstract

One of the ways for reducing the cost of thermal treatment of concrete and reinforced concrete products is the use of solar energy. Introduction into production of method of acceleration of curing with heated air of these products requires development of the installation. The installation consists of: planar solar energy collector, cameras for heat treatment hydro-insulated concrete or of reinforced concrete products, the fan, ducts. The air is heated in solar energy collector, enters the camera and heats the product. When the air is cooled it returns back to the reservoir. Quantitative analysis of processes of heat exchange in the solar energy collector is one of the factors determining design features of the collector and installation. Temperature field in the collector isn’t stationary. The overall time during which air is heated, divided into intervals duration of ∆τ. Thermal balances are folded for each time period, for light transparent cover; for heat accepting metal plate and heat isolation layer; for solar energy collector. The joint solution of these balances allows determining intensity of heating the air in the solar energy collector during each of the selected time periods. Heat supply to the collector for the selected time period consist of amount of solar energy absorbed by the light translucent cover collector; the amount of solar energy that passes through the light translucent cover collector; the amount of heat that enters the solar energy collector with air. Losses and expenses of solar energy heat collector for a selected period of time consist of loss of heat for heating a metal plate, loss of heat from the air that is removed from the collector of solar energy loss of heat for heating the translucent cover, loss of heat to the environment through horizontal and vertical located construction light translucent cover, loss of heat for heating a layer of insulation, loss of heat to the environment through the surface layer of horizontal insulation. In spring and autumn, it is necessary to perform quantitative analysis of heat losses through the vertical surface of the insulation layer, heat-collector for heating supports and heat loss to the environment supports manifold. The results of calculating temperature change in the solar energy collector during the initial period of time at different air flow were shown. The final decision concerning the the optimum quantities of air in the installation, was adopted on the basis of joint analysis of the heat balance of solar energy collector and cameras for thermal treatment of concrete or reinforced concrete products. Horizontal cover and lateral sides adopted transparent to the calculation model of solar energy collector. In the future, it will be necessary to analyze processes heat exchange in a plane collector on condition that sides of the collector have a different design solution. It will be necessary to develop a system of heat balances solar energy collector, which is made of translucent cover two layers between which is a layer of air (Insulating glass).

Last modified: 2016-07-26 15:29:46