Performance of a Solar LiBr - Water Absorption Refrigerating Systems

Up to now, the production of the cold is undertaking mainly by the classical way of compression refrigerator cycle. The cycle need an electrical power or mechanics expense for the training of the compressor and the C.F.C for their functioning. Most of the C.F.C impoverish the layer of ozone and participate with a considerable manner, to the increase of the sere effect, then to climatic changes. To contribute to the rational utilisation of energy and the protection of the environment, the research undertaken in the area of the cold has been mainly oriented to a new process adaptation in many fields like the food product conservation and climatisation. This can be obtained by the utilisation of process and sources of not conventional energy like the combined absorption process and solar energy. Besides the environmental aspect, these refrigerator systems are of great interest in the far rural zones which are not served by the electrical network, particularly for food product conservation and the air conditioning of tourist infrastructures and hotels in distant rural zones. Absorption cycles are autonomous systems which can provide a solution to this problem. After modelisation of the absorption refrigerator machine functioning with LiBr-H2O, by determining energy and mass statements of each cycle element supposed in the permanent regime. We have determined the COP of the solar single-stage absorption refrigerator as a function of the temperature in the different components of the cycle. Therefore, we have changed the dimension of the cycle by introducing double-line heat exchanger (between generator-condenser and between evaporator-generator). In this study, we present the variation of the COP and the heat-transfer rate with different temperature of the cycle, the obtained values are compared with an improved configuration using a doubleline heat exchanger.