A Computational Steady State Thermodynamic Analysis of Ammonia-Water and Lithium Bromide-Water Absorption Cooling System

  • 鄭 智明

Student thesis: Doctoral Thesis

Abstract

In this study various simulations were conducted to analyze optimize and compare two types of absorption cooling: lithium bromide (LiBr) and ammonia water solution systems Simulations to calculate the optimum Coefficient of Performance (COP) were performed for each system The study was divided into three parts In the first part of this research a steady state simulation model was created in the Excel software The simulation was created in the form of a datasheet calculator by selecting an appropriate thermodynamic model The calculator was able to calculate the COP and energy flow for different components in the ammonia water absorption cycle like the generator absorber condenser and evaporator The COP obtained was validated with previous studies and the COP obtained was 0 59 In the second part of this research for the LiBr system a steady state simulation model was developed optimized and validated using a software called Simulink in the program MATLAB? The simulation was able to calculate the COP and essential values at any component at any given set temperatures of the condenser evaporator absorber and generator The COP obtained was validated with previous studies and the COP obtained was 0 94 In the third part a comparison was made between them whereby the lithium bromide proved to have a higher COP than the ammonia water solution Hence the lithium bromide has better efficiency at higher cooling temperatures but the ammonia-water system can work better at lower temperatures Finally the absorber temperature proved to be the most influential factor in determining the COP of each system while comparing
Date of Award2019
Original languageEnglish
SupervisorWei-Hsiang Lai (Supervisor)

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