Experimental Study On Indoor Heat Dissipation Of Solar Driven Microchannel Heat Exchangers

With the rapid economic development and improvement of people’s quality of life, China’s total energy consumption has increased year by year. Building energy consumption in refrigeration and heating accounts for about 15% of total building energy consumption. The face of such a huge amount of energy consumption, reduce air conditioning energy consumption is imperative. Solar energy has a great potential to save building energy consumption, use of solar energy can meet the water demand of this kind of building energy consumption and indoor heating.In this paper, the use of solar energy to separate heat pipes as heat transfer components, microchannels as indoor radiators, proposed a microchannel radiator separate heat pipe solar heating system for the room heating, and to achieve the integration of the building. Compared with the traditional heat pipe, the separated type heat pipe can remote transmission heat, flexible layout, micro-channel heat exchanger as an indoor radiator, can obtain higher efficiency and indoor thermal comfort. The greatest characteristic of the system is only use the solar energy and phase change of the heat pipe working medium inside circulation, heating of the building can be realized, can greatly reduce the building heating energy consumption in winter. In the building of the separated type heat pipe solar indoor heating system test bench,according to the climate characteristics in Nanjing area, experiments have been carried out to test in December 2016.The following main contents are studied:Study on heating System Performance of Indoor radiator Device. For four consecutive days test system under different solar radiation intensity parameters such as heat, indoor temperature, and compared with conventional radiator heating system performance. The results show that the thermal performance of microchannel radiator heating system is in good level, indoor temperature is above 18 ℃, heating time 5 hours, is a good auxiliary indoor heating unit.2、The influence of thermal performance on the contrast system under different solar radiation intensity is studied. The results show that the solar radiation intensity has a great influence on the heat dissipation, thermal efficiency and temperature difference between the inlet and the outlet of the solar collector, and the three increases with the increase of the irradiation intensity, but the increase trend is slow.The variation trend of the parameters of the system is lagging behind about 30 minutes compared with the solar radiation intensity. The thermal efficiency of the microchannel radiator heating system can reach more than 42% under the cold weather condition in winter.3、The influence of different air volume on the thermal performance of microchannel radiator heating system was studied , the results found that the air volume has a great influence on the heat dissipation of the microchannel radiator heating system, the thermal efficiency of the system and the temperature difference between the inlet and outlet of the solar collector. The three increases with the increase in air volume, but due to heat transfer time is shortened, the growth trend slows down. The change in air volume has little effect on the indoor temperature, the room temperature is kept above 18 ℃, lag of outdoor temperature about 1 hour. When the air volume is small, the radiator surface temperature is higher, but with the air volume increases, the impact on the surface temperature becomes smaller.