Abstract
The absorption refrigeration machines represent a good alternative to compression refrigeration machines but the major problem of this type of refrigeration lies in the COP, which seems to be less efficient. Several researches are carried out to improve the performances of these machines such as the combination with the technology of the ejectors. In this work, we are interested in the three ammonia-water absorption cycles: Single effect absorption, Ejector-absorption and Combined ejector-flash tank absorption cycles. A gas-gas ejector would be installed 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. We used simulations in order to compare the performances of these three different cycles. The simulation results demonstrate that the combined ejector-flash tank absorption cycle performs better than others.
Highlights
Use Mechanical vapor compression refrigeration is widely known for its negative effect on the environment
The absorption refrigeration machines represent a good alternative to compression refrigeration machines but the major problem of this type of refrigeration lies in the COP, which seems to be less efficient
Sun [1] studied this cycle working with the LiBr-H2O couple, he compared it to that of the single-effect cycle and he noticed a considerable improvement of the COP
Summary
Use Mechanical vapor compression refrigeration is widely known for its negative effect on the environment. Finding new alternatives may help achieve energy efficient systems with 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. Sun [1] studied this cycle working with the LiBr-H2O couple, he compared it to that of the single-effect cycle and he noticed a considerable improvement of the COP. A computer simulation using Fortran 90 program was developed to analyze the performance of the modified combined cycle. He concluded that an improvement in the performance of this cycle can be reached using this method. We are interested in the three ammonia-water absorption cycles and we used simulations by Aspen-Hysys in order to compare the performances of these three different cycles
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