Comparing the temperature of each room In order to study the cooling effect of the system, the average temperature of the room in the experimental room and the adjacent three rooms, the phase change energy storage system failed to play the advantage of phase change energy storage, but mainly used The advantage of night ventilation and cold storage. Even so, only 12% of the time room temperature is higher than 31 °C. Moreover, the comfort temperature section of the laboratory room is obviously longer than other rooms, which indicates that the system has a significant cooling effect. The energy consumption analysis is based on the phase change energy storage device inside the ceiling. In the 208 hours of continuous cooling, the cumulative energy consumption of the fan is 262 MJ, so in the ideal 379 MJ of accumulated cooling capacity, it is passed to the teacher Zhao upstairs. The cooling capacity of the room is 39MJ, which is 6MJ passed to the room through the ceiling. The air loss is 20MJ, and the cooling loss of the fan is 262MJ. The cooling capacity that is actually transmitted to the room through air convection heat transfer is only slMJ. It can be seen that an unreasonable fan (less than 10% efficiency) results in a system with a very low CoP of only 0.63.
The problems in the test bench and the improvement direction make the fan: the resistance of the system is not large, but the fan is selected too much, resulting in a large amount of heat dissipation, which will have a negative impact on the cold storage process or the cooling process. Moreover, the fan efficiency is very low, resulting in unreasonable system energy consumption. Therefore, as the only energy-consuming component, selecting a reasonable fan to make it operate efficiently can greatly improve the performance of the system. . The internal air duct of the ceiling: Because the phase change energy storage device has a flat rectangular shape, the air volume is not easy to be evenly distributed. Although some measures to improve the uniform distribution of air volume have been taken during the construction of the experimental platform, this is still an aspect that needs attention and improvement. In addition, some problems in the construction process have led to a certain short circuit in the air duct inside the ceiling. System optimization operation management: The system operation management mode has a great impact on system performance. For optimal operation, the air volume of the system should be optimized on a time-by-time basis. The concept of night-time ventilation phase change cold storage ceiling system is proposed, and its operation principle is expounded. The performance analysis of the experimental equipment built in Beijing area was analyzed and analyzed, and the shortcomings of the experimental platform were presented. The results show that the system has obvious cooling effect.
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