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提出相变材料(PCM)+水的太阳能联合储能方案,将其应用于24 h供热水的传统太阳能加电辅热热水系统中,建立PCM+水联合储能的数学模型。将该系统应用于昆明地区的情况进行全年模拟分析,对比有无PCM时储热水箱中水温的变化、热损失及电辅热耗电量。结果表明PCM联合储能的热水系统,储热水箱中水温波动小;即加入PCM联合储能对水箱中水温有“削峰填谷”的作用,热损失和电辅热耗电量均减小,全年节电率达17.7%。分析了相变温度与PCM体积比(PCM体积与水体积之比)对水箱储能性能的影响,给出了水箱储热性能随相变温度和相PCM体积比变化的规律及其选取范围。
A joint solar energy storage scheme of phase change material (PCM) + water was proposed and applied to the traditional solar-assisted auxiliary heating hot water system for 24 h hot water supply. The mathematical model of PCM + water storage energy storage was established. The system is applied to the Kunming area for a year-round simulation analysis to compare the presence or absence of PCM water storage tank when the water temperature changes, heat loss and electric auxiliary heat consumption. The results show that the water temperature in the hot water system and the hot water storage tank with PCM combined storage is small; that is, the effect of adding the PCM combined storage to the water temperature in the water tank is “peak clipping and filling”, the heat loss and electric auxiliary heat consumption The amount of reduction, the annual saving rate of 17.7%. The influence of phase transition temperature and PCM volume ratio (PCM volume to water volume) on the energy storage performance of water tank was analyzed. The law of heat storage performance of water tank with phase change temperature and PCM volume ratio and its selection range were given.