Experimental study of roof radiation absorption modules applied to solar hot water and insulation to lower air conditioning load

• Main Authors: YU CHENG LIANG, 梁育誠
• Other Authors: Yew Khoy Chuah
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/ym64ur

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 104 === Modular units of radiation floor that can replace the roof insulation layer was experimented and analyzed. The design studied is passive in nature made of light concrete and would not change the appearance of the roof basically. Water was designed to circulate through the stainless coil imbedded in the modules. By such design solar water heating and roof insulation are integrated. The heat collection efficiency was tested up to 32.3% in the case with pump circulation. At certain conditions natural water circulation up to 0.04 m3 was obtained with no pump power, eliminating the pump noise at the same time. The hot water temperature measured agreed with the mathematical model within ± 12%, that verify the accuracy of the theoretical model of this study. Either types of water circulation has been tested and found to keep the roof temperature below 40℃. The results indicate the effectiveness of the heat insulation of the modules studied. The technology studied is a viable Green Technology. When applied to a ten story office building case of 18000m2 roof area, dynamic building energy simulation with Taipei meteorological data of 2015 has shown a reduction of heat load 9-11% for the top floor, and up to 50-66% reduction of conductive heat load. The results show the effectiveness of reducing heat load and save energy. The hot water heating rate was tested to be 5.5-10kW. For 50℃ hot water up to 1165-4821 liters can be produced. Combine energy saving of air-conditioning and electric boiler, annual saving of about NT 150,000 can be achieved.