Abstract
Refrigeration by absorption is gaining more and more importance nowadays especially in applications where the source of energy used in the generator is renewable. However the major problem of this type of refrigeration lies in the COP, which seems to be weaker than compression machines. The use of an ejector is one of the means that can help overcome this problem. In this work, we are interested in the ammonia-water absorption cycle comprising a gas-gas ejector interposed between the generator and the condenser. We suppose that adding a flash tank between the condenser and the evaporator could help improve the entrainment ratio of the ejector. Simulations using the Hysys software are performed in order to look for the optimal conditions for the work of this machine and to make a comparison in terms of performance with single effect cycles. Results showed a significant improvement in the COP and proved therefore that it has better performance than single effect cycles.
Highlights
The artificial production of cold relies mainly on mechanical vapor compression refrigeration machines which have a negative effect on the environment
Alexis [3] carried out an analytical study using two simple models to characterize the performances of an ejector system used for air conditioning, Chen [4] examined a combined cycle with R22 / DME-TEG and he showed that there is an improvement in COP compared to the conventional cycle, especially at lower generator temperatures
The work done is based on the modeling and simulation of the refrigeration machine using the Aspen-Hysys software which is an advanced flowsheeting tool for process simulation
Summary
The artificial production of cold relies mainly on mechanical vapor compression refrigeration machines which have a negative effect on the environment To overcome this problem we find new ways to achieve energy efficient systems while having a low environmental impact. In this context, the absorption technology for refrigeration is generating great interest due to the fact that the source of energy used in the generator is renewable. Sirwan [5] studied the improvement of the ejector cycle by adding a vapor-liquid separator after the refrigerant expander and booster He mentioned that there is a great improvement in the performance of this cycle. We suppose that adding a flash tank between the condenser and the evaporator could help improve the entrainment ratio of the ejector
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