西北地区太阳能采暖系统储热水箱热损失试验研究

Experimental study of heat loss of heat storage tank in solar heating system of northwest region

以西北新农村117.07 m^2的单体建筑太阳能采暖系统为研究对象,以12月15日为例,得出储热水箱热损失主要发生在自然冷却阶段,当日储热水箱的总热损系数为5.68 W/℃,总热量损失为9.49 MJ.再选取其余11个典型日的试验数据对储热水箱总热损系数和总热损失各影响因素进行拟合,储热水箱总热损失由于受到环境温度和室外风速的影响,储热水箱的温度也随之变化.研究结果表明:平均环境温度每降低1℃,储热水箱总热损失增加0.067 MJ;室外风速每增加1 m/s,储热水箱总热损失增加0.042 MJ;储热水箱平均温度每降低1℃,储热水箱总热损失增加0.068 MJ;储热水箱温度变化幅度每增加1℃,储热水箱总热损失增加1.641 MJ.针对储热水箱热损失分析及室内热环境现状,提出将储热水箱置于室内以增强储热水箱储热能力和改善建筑室内舒适度.

Taking the solar heating system in an 117.07 m^2 northwest China as investigation object and the day of December 15 th as an example,it is concluded that the heat loss of heat storage tank occurs mainly during the natural cooling period,the total heat loss of the heat storage tank is 9.49 MJ when its daily total heat loss coefficient is 5.68 W/℃.Then the test data of other 11 typical days is chosen to carry out the fitting of several factors of influence on total heatloss coefficient and total heat loss of the heat storage tank.It is shown that the total heat loss of the heat storage tank will be influenced by the ambient temperature and outdoor wind speed,leading to the change of the temperature of the heat storage tank.Decrease of every 1℃of average ambient temperature will increase the total heat loss of heat storage tank by 0.067 MJ and the increase of every 1 m/s of outdoor wind speed will increase the total heat loss of the heat storage tank by 0.042 MJ,The increase of temperature of 1℃of heat storage tank will increase the total heat loss of heat storage tank by 0.068 MJ.The increase of the temperature of 1℃of heat storage tank will increas the total heat loss of the heat storage tank by 1.641 MJ.Aimed at the analysis of heat loss of heat storage tank and the present situation of indoor thermal environment,it is presented that a suggestion on indoor location of heat storage tank can be taken into consideration to enhance the heat storage capacity of heat storage tank and improve the indoor comfortableness of the building.