(Influence of School of Civil and Hydraulic Engineering, Tsinghua University, Beijing 100084). The observation results show that the external thermal insulation system can reduce the surface temperature of the indoor wall affected by the change of outdoor air temperature, avoid the cold wall effect in winter, keep the indoor temperature and relative humidity relatively constant, and improve the indoor living environment.
3A article number 1001 - Beijing belongs to the hot summer and cold winter, the summer climate is hot, and the winter is cold. In order to save energy, at the same time, we can have a comfortable indoor environment, national building energy-saving energy standards, actively carry out research on building energy conservation, and adopt energy-saving technical measures suitable for this area as soon as possible. The exterior insulation system is a new construction system consisting of polymer cement mortar, EPS (Expaiukble Polystyrene) board, glass fiber mesh cloth and veneer coating. With the continuous improvement of materials and application technology, the exterior insulation system has become one of the most competitive systems in today's building energy-saving walls. From 1973 to 1993, about 200 million m2 of buildings were used in Germany. In some big cities in China, there are some applications in engineering applications in Beijing, Shanghai, Guangzhou and other cities. In the initial stage, this paper analyzes the influence of external thermal insulation system on indoor temperature and humidity through testing.
1 Experimental system 1.1 Wall structure and indoor environment control of the experimental house The indoor area of ​​the two independent experimental rooms is 12m2, and the clearance is 28m. Except for one insulation door, there are no windows on the four walls, and the structure of the roof and the ground is the same.
The structure of the thermal insulation wall of the experimental room using the external thermal insulation system is: interior wall coating, 25mm thick mortar screed, 200mm thick hollow clay brick, 50mm thick EPS board, 5mm thick polymer cement mortar, fiberglass mesh , plastering mortar, exterior paint. Interior wall coating, 25mm thick mortar screed, 200mm thick hollow clay brick, plastering mortar, exterior wall coating.
The air conditioner is used to control the indoor temperature: 25 C in summer and 20 C in winter, and ventilation is ventilated with a proper amount of ventilation fans.
1.2 Sensor Arrangement and Experimental Data Collection Temperature sensors are installed on the outdoor wall of the four walls of the house, the inside of the EPS board and the interior wall of the house using the external wall insulation system; the humidity sensor is installed inside the EPS board, and no external sensor is used. The house with the external insulation system is equipped with a temperature sensor on the inner and outer surfaces of the western wall. Temperature and humidity sensors are installed in the central room of both rooms and in the outdoor shutters. The computer program was written by itself and controlled by computer. The temperature and humidity changes were recorded every 5 minutes. The experiment began in September 2002 and has been observed for one year.
2 Discussion and analysis of experimental results 21 Surface temperature of indoor wall of external thermal insulation house During winter heating period, the influence of outdoor temperature change on the surface temperature of indoor wall is small. It can be seen that in winter, two months in Beijing are cold. When the outdoor temperature is 10C, the surface of the indoor wall is basically stable at around 18C, and the temperature of the wall surface in all directions is basically the same. It can be seen that in May, the temperature outside Beijing was very volatile, and the temperature of the indoor wall without air conditioning did not change much, and the temperature was between 20 and 24C. It can be seen that in August, when the outdoor temperature is high, the indoor wall temperature is basically maintained at the temperature controlled by the air conditioner, and it can be seen that the external influence is still small. The structure of the contrast wall without the external wall insulation system experimental room is: change æ :: a butterfly disk insulation room indoor wall surface temperature insulation room indoor wall surface temperature 2.2 indoor temperature comparison can be seen Out, in the winter of December, the indoor wall surface temperature of the experimental room using the external thermal insulation system is higher than that of the house without the external wall insulation system, and the temperature of the indoor wall of the experimental room without the external thermal insulation system is obviously The temperature of the outdoor changes with fluctuations in temperature. It can be seen that in the summer of August, the indoor wall temperature of the experimental room without the external thermal insulation system is higher than the indoor wall temperature of the external thermal insulation room, and obviously fluctuates with the change of the outdoor air temperature. The insulation effect of the external thermal insulation system is very prominent in the cold regions of winter. The surface temperature of the interior wall of the non-insulated room has a cold wall effect. In summer, the temperature of the wall does not change significantly with the change of the external temperature, and it can maintain appropriate conditions. temperature.
23 The relative humidity of the room can be seen from the sum. In winter, the relative temperature of the outdoor air fluctuates greatly. The relative indoor temperature of the external thermal insulation laboratory is higher than the relative humidity of the laboratory without the external thermal insulation system. In the summer, due to the effect of ventilation, the relative humidity of the two experimental rooms changes with the fluctuation of the relative humidity of the outdoor, and the difference between the two is small.
Comparing the indoor temperature of the two experimental rooms The comparison of the indoor temperature of the two experimental rooms The relative temperature of the two experimental rooms ensures that the relative humidity in the room is basically stable and improves the comfort of the indoor environment.
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