太阳能地面采暖系统蓄热水箱容积分析

通过分析太阳能采暖系统所需蓄热鼍与建筑热负荷、太阳能集热量日变化规律之间的关系,得出太阳能采暖系统所需蓄热水箱容积的理论算式.根据拉萨、银川、西宁、西安等地的太阳辐射强度及建筑热负荷的日变化规律,模拟得出系统所需蓄热量变化规律;并对各种蓄热温差下对应的蓄热水箱容积进行了模拟分析,结果表明:太阳能采暖系统所需蓄热量随太阳集热器的集热量与建筑热负荷之间的差值增大而增加;蓄热水箱容积随蓄热温差增大而减小,当蓄热水温达到80℃时,在各种地面采暖系统取水温度下,单位集热器面积所需蓄热水箱容积趋于相等.

VOLUME OF HEAT STORAGE TANK FOR SOLAR FLOOR HEATING

The volume of hot water tank for heat storage required in solar heating system was revealed by analyzing the relationship of heat storage with undulations of solar radiation intensity and heat load of buildings. Then, the volume of hot water tank was simulated according to varieties of heat storage and water temperature in the tank in Lhasa, Xining, Yin-chuan and Xi'an, respectively. The results show that heat storage required in solar heating system is proportional to the gap between heat collection and heat load; the volume of hot water tank can be reduced with higher water temperature in it; and tank volume needed by unit solar collector area tends to unification when the water temperature in the tank reaches to 80℃, even supplied water temperature of floor heating is varied.