Evaluation of gas-fired desiccant cooling system in Hong Kong wet market : case study

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Evaluation of gas-fired desiccant cooling system in Hong Kong wet market : case study


Author: Chan, Kin-wai
Title: Evaluation of gas-fired desiccant cooling system in Hong Kong wet market : case study
Degree: M.Eng.
Year: 2006
Subject: Hong Kong Polytechnic University -- Dissertations
Marketplaces -- Air conditioning -- China -- Hong Kong
Marketplaces -- Energy consumption -- China -- Hong Kong -- Evaluation
Department: Dept. of Building Services Engineering
Pages: xvi, 125, 17 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1973661
URI: http://theses.lib.polyu.edu.hk/handle/200/5533
Abstract: Since the outbreak of bird flu in 1997 with 6 fatal cases reported, people have become more concerned about the indoor air quality (IAQ) in Hong Kong wet markets. Some experts discovered that the high humidity level in the wet markets probably causes the spread of bird flu and the growth of fungi which seriously influence personal health. The Desiccant Cooling (DC) system with 100% fresh air supply yields lower humidity in the conditioned space compared to the conventional system. In this paper, a case study of the gas-fired desiccant cooling system with all fresh air supply in the Hong Kong Hin Keng Wet Market is analyzed. The simulation model of the existing DC system is validated and provided to predict the energy performance in Hing Keng Wet Market under Hong Kong weather conditions using hour-by-hour calculation. Based on the energy consumption result, the CO2 emission and operating cost of DC system are also estimated by adding the CO2 emission factor and unit cost of dual energy sources. The energy consumption, CO2 emission and operating cost of DC system are compared with the conventional cooling with reheating (CR) system. The results indicate that the dual energy sources (town gas and electricity) DC system saves up to 30% of electricity energy, 16.3% of CO2 emission and 5.3% of operating cost throughout the year. Compared the total energy consumption (town gas and electricity) with CR system, DC is not energy efficient and its annual energy use is 5.3% more than CR. More interestingly, the energy efficient use of DC is not only in the hot and humid period (summer) but also in the cold and dry period (winter) under Hong Kong climate. It is suggested that the optimum use of DC should be under the period when the outdoor moisture content is < 0.0 135 kg/kg or when outdoor temperature is > 30°C with outdoor moisture content is > 0.0216 kg/kg.

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