Abstract
In order to understand the behavior and to determine the effective operational parameters of a solar-driven ejector air conditioning system at low or medium temperature, a dynamic model depends on the principles of conservation, the momentum mass and energy is developed. For this purpose, the thermodynamic characteristics of the liquid and vapor refrigerant were identified using the Engineering Equation Solver (EES) software. Linear Fresnel solar reflector has been used as a tool to convert solar energy into thermal energy. Water (R718) was used as a refrigerant. The operational conditions for the studied solar-driven ejector air conditioning system are as follows: evaporator temperature “Te =283.15 K”, condenser temperature “Tc =305.15 K”, and generator temperature “Tg = 373.15 K”. The performance of the ejector air conditioning system was compared as a function of the operating parameters of the subsystem. The average value of thermal efficiency of the Fresnel linear concentrator has reached 31.60 %, the drive ratio “ω” is 0.4934, the performance value of the ejector air conditioning subsystem “COPejc” is 60.664 % and the average value of the thermal performance of the machine “STR” has touched 19.17 %. The results obtained through this scientific subject are stimulating and encouraging, where this technique can be used for air conditioning in desert areas in southern Algeria, where fossil energy (petroleum, gas, etc.) is extracted and produced in various types.
Highlights
The use of solar energy in sunny countries such as Algeria is an effective way to overcome the lack of energy especially in rural areas where it is sometimes difficult and expensive to feed them with the conventional electricity grid [1, 2]
It is possible to employ this solar energy in the field of air conditioning of various types in order to reduce the use of fossil electricity
To calculate the direct-normal irradiation “direct normal irradiance (DNI), W/m2” from sunrise to sunset, an algorithm has been developed to simulate it by the semi-empirical model of PERRIN DE BRICHAMBAUT [3, 36], where the July 17, 2018 was selected as the typical day of the study
Summary
The use of solar energy in sunny countries such as Algeria is an effective way to overcome the lack of energy especially in rural areas where it is sometimes difficult and expensive to feed them with the conventional electricity grid [1, 2]. Among the industrial and household sectors that consume large quantities of electricity in the world are air conditioning systems. These systems drain about 17 % of global electricity consumption. For this reason, the world has turned its attention to the search for clean and continuous alternative energy for the production of electricity, as well as to reduce the use of mechanical elements that consume electricity in large quantities, while working on the use of environmentally friendly refrigerants
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