A study of thermal performance and ventilation of a model house equipped with a vacuum solar water heater การศึกษาสมรรถนะเชิงความร้อนและการระบายอากาศของบ้านจำลองที่ติดตั้งเครื่องทำน้ำร้อนพลังงานแสงอาทิตย์ชนิดสุญญากาศ

Abstract

This research aims to study the thermal and ventilation performance of a model house with a one-sided window for ventilation, which directly affects the rate of air conditioning energy consumption. The researcher thus proposed the idea for ​​reducing air conditioning energy consumption for this category of household type.  This house type would absorb incoming solar radiation in addition to the benefits of solar ventilation solutions. The experiments were conducted on the roof deck of a 10-storey building in Bangkok. Two model houses (1.5m wide x 1.5m long x 2.5m high) were built, using concrete tiled gable structures and lightweight brick walls. The solar panel was installed on the roof and it was connected directly to low-powered ventilation fans above the windowpane. A vacuum tube solar water heater was installed by the windowpane of the first house. The second house was not equipped with a solar water heater, but a double-glazed window was set to insulate the room.  From the data collected between February and April (summer season), it was found that the temperature inside the first model house was ~1-2 °C lower than the temperature of the second model house. The first model house’s internal airflow value was 0.12-0.63 m/s higher than the second one (without a water heater system). By the same token, the first model house’s heat transfer value through the window was found to be 30 percent better than that of the counterpart.