Study on Indoor Thermal Environment and Energy Consumption Performance of EAG House Using Different Control Strategies

• Main Authors: Yu-wen Chang, 張又文
• Other Authors: Yi-Jiun Lin
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/6wa87u

碩士 === 國立臺灣科技大學 === 機械工程系 === 99 === This research presents characteristics of thermal environment and energy consumption of EAG House in the spring, fall and winter seasons by experimental field measurements. EAG House are equipped with shading, natural ventilation, earth tube system, solar chimney fans and air conditioning systems. The thesis shows the influences of environmental control strategies on indoor thermal environment and energy consumption. This research uses three types of sensors; variations of air temperature in the earth tube were measured by the sensors with recorders; variations of indoor air temperature were measured by wireless RFID sensors; variations of power consumption of indoor environmental control equipment were measured by digital meters. The results of using single indoor environment control strategy show that using shading under a large solar radiation condition can reduce the indoor environmental temperature about 1℃. Under the circumstance of using natural ventilation, the variation of indoor environmental temperature depends on the outdoor environmental temperature because of the interaction between the indoor and the outdoor environment. According to the literature, earth tube can precool air temperature in the summer and preheat air temperature in the winter. Field measurements show that there is a temperature increase of about 2 to 3℃ in the indoor environment of EAG House in the winter, when the earth tube system is used. And the power consumption of the earth tube fan is about 0.23 kW. The air temperature in the vertical shaft of the earth tube varies with its depth. In the spring, fall and winter seasons, the temperature of the earth tube at the deeper position is higher and more stable. The temperature of the earth tube maintains around 25 to 26℃ in the fall season, around 22 to 24℃ in the winter season, and around 18 to 20℃ in the spring season from 1.6 to 3.2 meters deep underground. It shows that the temperature of the earth tube attains more steady, when the underground depth is larger than 1.6 meters. The results show that only using the solar chimney fan can not provide significant ventilation. Using air conditioning system can cool the average indoor environmental temperature about 6℃ in the summer, but it needs to consume more electricity energy power, about 0.46 kW. Field measurements of using two indoor environment control strategies show that combining natural ventilation or earth tube fan with the solar chimney fan can enhance convection inside the solar chimney, providing good ventilation in EAG House.