Title : Absorption-diffusion refrigeration machine: A case study of low carbon alkanes used as refrigerants
Abstract:
The human tendency consists in seeking a greater material comfort continuously. The field of the production of cold does not escape the rule. This tendency is evolved quickly, which requires more energy, therefore more terrestrial reheating and climatic change. So the research of no harmful refrigerant is necessary .
We propose in this work a numerical investigation of a diffusion-absorption refrigeration cycle working with a hydrocarbon mixture. It is about a machine of low refrigerating power (300 W) .The level of temperature in the generator is about 150 °C (fossil energy or solar energy) and it working with a no harmful mixture for the environment . We used a cooling medium temperature in the condenser and absorber at 35° C .Helium is used as an inert gas. The total pressure of operation is about 17.5 bars.
A modeling on suitable software was made for the system. the use of propane and butane as refrigerant was considered. The validation of our model was made by comparison with the literature results. Parametric studies are also undertaken to analyze the effects of the temperature of the generator, and also the temperature of evaporator on the performance of the system .Generally, we can conclude that the mixture of hydrocarbon proposed is a rather promising refrigerant as for the technical advantages which it offer, such as the use potential of a heat source at a temperature not exceeding 150°C.
