Optimization of Irreversibilities in Water-Lithium Bromide Absorption Refrigeration System
P.Tharun Sai, Dr. K. Appa Rao
MAT LAB, second law, irreversibilities, crystallization zone
The main objective of Vapour Absorption Refrigeration system(VAR) is to Produce refrigeration effect by consuming low grade energy(Heat). The basic components of VAR system are Evaporator, Absorber, Generator, Solution heat exchanger, Expansion valve, Condenser. Since VAR system is heat operated cycle. The temperatures of generator, condenser, evaporator and absorber plays crucial role on performance of the VAR system. To analyze variation of temperatures on each component of VAR system a 2TR water lithium bromide system is designed based on first law analysis and Second law analysis is going to be carried out on each component of VAR to identify irreversibilities. After identification of the irreversibilities attempts to increase COP and decrease irreversibilities of VAR system is going to be done by optimization of temperatures on generator, condenser, absorber by keeping refrigerating load and evaporator temperature constant and writing entire procedure of thermodynamic analysis in MAT LAB script. The MAT LAB script runs on user provided inputs of generator, evaporator, absorber and condenser temperatures. After various iteration of temperatures on VAR system. The optimum temperatures are going to be found out on each component by keeping other component temperatures constant and varying the specified component temperature in VAR cycle. The temperature which produces minimum irreversibilities in the cycle (i.e. irreversibilities should be greater than zero if irreversibilities are less than zero process is impossible) is taken as optimum temperature. After finding out all optimum temperatures the program runs over optimized temperatures (or nearer to optimum temperatures care should be taken to avoid system entering into crystallization zone). The performance parameters (COP, irreversibilities, second law efficiency) are obtained. The performance parameters before optimization of VAR system are compared with obtained results.
Article Details
Unique Paper ID: 143867

Publication Volume & Issue: Volume 3, Issue 3

Page(s): 8 - 15
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