Abstract

Solar refrigerator machines based on solid adsorption present a highly interesting solution to the Industry of Cooling Production. In one hand, they are significantly attractive economy ways because of the abundance of the solar energy resources. In the other hand, they are environment friendly. As a result, these machines could present one of the most competitive solutions to the improvement of this very industry. The aim of this paperwork is to provide an accurate study on how to design, seize and build a prototype of an adsorption solar refrigerator using activated-carbon/ammonia pair: Firstly, we used a static model, which is based on the use of state equations (vapor/liquid) at thermodynamic equilibrium. This model computes the cycled mass and the cycle coefficient of performance (COPc) for each four characteristic temperatures of the cycle. Secondly, we develop a dynamic simulation program based on conservation equations of energy and mass in the reactor, this program allow the calculation of the temperature, the pressure inside the reactor, the adsorbed mass and the solar coefficient of performance (COPs). Finally, in the light of our results, we design this prototype, it would consist of the reactor: a solar panel, size 1 m2contain tubes with a diameter of 10cm, an air condenser, and a cold chamber containing an air evaporator.

Highlights

  • A variety of cooling technologies is available in today’s market

  • We develop a dynamic simulation program based on conservation equations of energy and mass in the reactor, this program allow the calculation of the temperature, the pressure inside the reactor, the adsorbed mass and the solar coefficient of performance (COPs)

  • 3.2.5 Results of the second simulation: The figure3 shows the variation of the COPs as a function of the diameter of the tube, it can be seen that the COPs increase to an maximum value of 0,109, it correspond to an optimum diameter of the cylinder equal to 10cm

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Summary

Introduction

A variety of cooling technologies is available in today’s market. Many of these technologies are not ecological friendly. Most of the refrigerants (CFC, HFC, HCFC...) using in these conventional technologies is not healthy for the environment and without high performance to reduce CO2 emissions contributing to the greenhouse effect [1] Another concern regarding this technology is the availability of electricity especially in rural areas. Many theoretical and experimental studies [2] [3] have demonstrated the feasibility of such machines in the Mediterranean climate For this purpose, our objective is the development of a Solar refrigerator (realization in progress) based on solid adsorption principle, where the pair adsorbent/adsorbate is activated carbon/ammonia. In the light of the models results’ we have designed our machine This prototype would consist of: -­ A solar panel size: 1m2, it can reach a maximal temperature between 80° and 90° and it contain tubes with the optimum diameter of 10cm. A cold chamber containing an air evaporator in the form of a cylindrical tube with a diameter of 1cm and a length of the tube equal to 74,72cm

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