An Experimental Study of the Performance on Aqua-Ammonia Absorption Refrigeration System
Date Issued
2005
Date
2005
Author(s)
Hsu, Wei-Hang
DOI
zh-TW
Abstract
Absorption refrigeration system drives many benefits, encompassing economy, environmental protection, low noise as well as energy multiplicity. The study aims at constructing aqua-ammonia absorption refrigeration and experimental evaluation and adopts a simulated exhausted motor temperature as driven heat source, to analyze varied effects caused to the system. The study primarily intends to promote systematic efficiency and examine feasibility of applying to motors.
The system is mainly composed of an evaporator, a condenser, a generator, a rectifier, an absorber, a storage tank and pumps. The controlled variables are the fan frequency, the generator temperature, the pump frequency, and the water/glycol solution temperature. The cooling capacity and coefficient of performance (COP) of the system is also investigated.
The experimental results manifested that the generator temperature is mainly affected by the supplying heat source, and the cooling capacity also increases from 3000kJ/hr to 5100kJ/hr (approximately 0.24-0.4 ton) while the generator temperature increases in the range of 100ºC~135ºC. Nevertheless, the value of the cooling capacity slightly decreases to 0.23 after increasing from 0.19 to 0.24, and thereby it is recognizable that the value of the coefficient of performance (COP) of the system would be the highest in a particular operational condition, producing an optimum value of the generator temperature.
The absorber cooling water/glycol solution temperature would also affect properties of the system when the temperature rises from 8℃ to 24℃, and the quantity of heat transfer from the absorber descends; the cooling capacity of the system also declines from 8000kJ/hr to 4000kJ/hr, causing a decrease of the value of COP. Meanwhile, this experiment manifests that the faster fan frequency generates lower condensed temperature, and the high pressure of the system decrease with condensed temperature. The value of water/glycol solution temperature also affects the properties. While the water/glycol solution temperature descends, the heat transfer would become worse due to the small differences with the refrigerant within the evaporator; therefore, the value of COP and cooling capacity would also decrease.
Compared with the results of mentioned study, the tendency of predicted results about COP and cooling capacity of system is similar to that of the literatures. The result of cooling capacity and low COP provide a gap to be improved and overcome in order to promote systematic efficiency and feasibility in motor application.
Subjects
吸收式
氨水
冷凍
absorption
aqua-ammonia
refrigeration
Type
thesis
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