Experimental study on the thermal performance of composite phase change ventilated roof

With the improvement of people's living standards, building energy consumption presents a trend of the increasing year by year. The phase-change energy storage technology is applied in the building so that the building envelope has good thermal insulation ability, and thermal storage performance the energy consumption of the building heating and air conditioning system will be greatly reduced. A new ventilated roof composed with multiple phase change material (VR-MPCM) was proposed as the experimental room, and a room of the same size conventional ventilated roof (CVR) was set as the contrast room. The PCM panel of myristic acid and tetradecanol was installed outside the test room, and the PCM panel of lauric acid and tetradecanol was installed inside. Then three kinds of summer experiments were carried out: stage I, natural cold storage; stage II, the ventilation layer regularly opened cold storage; stage III, the ventilation layer regularly turned on and composite cooling. The research results show that compared with the comprehensive outdoor air temperature, stage II can reduce the peak temperature in the experimental room by 41.1-44.9%, the minimum indoor air temperature increased by 19.2-27.7%; stage III can reduce the peak temperature in the experimental room by 43.2-47.0%, and increase the minimum indoor air temperature by 26.7-43.9%. At the same time, stage II reduces the dissatisfaction rate of the indoor thermal environment (DR) by 15.5% and stage III by 40.2%. Regional comparison indicated that both stage II and stage III can effectively reduce the outer surface of the roof and indoor air temperature in severe cold areas, and reduce the fluctuation range of indoor air temperature, which has obvious potential for energy saving. Among them, stage III will make the indoor environment more comfortable.

Automated summary

With the improvement of people's living standards, building energy consumption is increasing year by year. Phase-change energy storage technology can greatly reduce the energy consumption of building heating and air conditioning systems. Different summer experiments show that ventilated roofs with multiple phase change materials can effectively reduce indoor temperature fluctuations and energy consumption.