Simulation of sky radiator with thermal storage for natural cooling

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Simulation of sky radiator with thermal storage for natural cooling


Author: Li, Shujing
Title: Simulation of sky radiator with thermal storage for natural cooling
Degree: M.Eng.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Energy conservation.
Indoor air quality.
Department: Dept. of Building Services Engineering
Pages: xv, 70 leaves : ill. ; 30 cm.
Language: English
Abstract: Nowadays, energy saving is a worldwide issue. For the modern building, HVAC system consumes a major portion in the whole building, especially in the day time. A method which uses the sky radiator to release heat and store cooling energy in the phase change material in nighttime can save a lot of money and energy because the natural resources are used for provide cooling and the chiller system are not used when the radiator has the ability to supply the cooling energy. This dissertation is aimed to assess the performances of a sky radiator combined with a thermal storage system. Three typical Chinese cities, which are Hong Kong, Beijing and Harbin, are selected in order to investigate the feasibilities of the radiator under the different weather condition. The theory and modeling methodologies of the sky radiator are studied. The cooling load of a building floor was simulated by the software of energyplus while the heat emission of the sky radiator was calculated by a set of radiation equations. It can be found that the performance in winter time was better than the summer time in Hong Kong. Some of the days in winter the radiator can provide all the energy needed to the building since the cooling load is relatively lower at that time and the cooling energy is not needed in winter time in Beijing and Harbin. For Beijing, it has a good performance from April to September except the hottest month which is July. For Harbin, the performance of the radiator is much better than Beijing, and the heat emission is around 20% of the total cooling load even in the hottest month. Based on the findings and available data, the performance of the radiator is affected by the outdoor temperature, humidity, wind speed and the other weather data. The results from this dissertation give us a rough idea of the performance of the radiator in three typical cities in China. The reality to the sky radiator which is mainly caused by the weather condition should be further investigated.

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