Design, fabrication and testing of an intermittent aqua-ammonia absorption refrigerator for cooling applications

Date

5-2009

Degree

Bachelor of Science in Agricultural Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Arnold R. Elepaño

Committee Member

Jessie C. Elauria, Kevin Yaptenco

Abstract

This study was undertaken to develop and determine the technical feasibility of converting a vapor compression refrigerator into an intermittent absorption refrigerator. An old domestic vapor compression refrigerator was converted into an intermittent aqua ammonia absorption refrigerator using the existing condenser and evaporator. The theory of intermittent absorption refrigeration was utilized in the design. No electricity was used during operation. The heat source was a single-burner stove connected to a LPG tank. The concentration of aqua-ammonia used in the system is 28%. The operation of the system occurs in two stages: regeneration stage and refrigeration stage. Ammonia is driven out of the ammonia solution during regeneration while heat is supplied and refrigeration took place during the refrigeration stage when the source of heat is removed from the system. Three test were done on the experimental set-up and the rate of heat transfer was determined as well as the coefficient of performance. Results of the experiments showed that the lowest evaporator temperature achieved by the absorption refrigerator is 26.1°C. The average capacity of the system is 0.04444kW and the average coefficient of performance is estimated to be 1.05. Certain assumptions were made to the analysis of the experiment. The quality of the absorption refrigerator needs further improvement since several leaks were present during operation due to its high operating pressure and temperature. This resulted to the poor performance of the system. But this study established the technical feasibility of converting existing vapor compression refrigerator into an intermittent absorption refrigerator to provide refrigeration on unelectrified barangays in the country.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology

Call Number

LG 993.5 2009 A2 M43

Document Type

Thesis

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