太阳能热水器单位轮廓面积下日有用得热量测试数据

单位轮廓面积下日有用得热量是太阳能热水器采集能量的重要指标，一定太阳辐照量下，单位轮廓采光面积贮热水箱内水的日有用得热量不低于规定值。本数据可以对太阳能热水器的日有用得热量进行评价，为政府监管和消费者购买提供参考和技术支撑。1、太阳能热水器日有用得热量q17按如下公式进行计算：q17=17*cpw*m*（te-tb）/Ac/H/1000000，其中cpw为水的比热容，取值为4186.8J/(kg•℃)；m为贮热水箱容水量，单位为kg；tb为集热试验开始时贮热水箱的水温，单位为℃；te为集热试验结束时贮热水箱的水温，单位为℃；Ac为轮廓采光面积，单位为m2；H为累计辐照量，单位为MJ/m2；2、数据分析：将以上数据按照GB/T 19141-2011《家用太阳能热水系统技术条件》要求，日太阳辐照量为17MJ/㎡条件下，日有用得热量(紧凑式与闷晒式≥7.7MJ/㎡，分离直接式≥7.0MJ/㎡，分离间接式≥6.6MJ/㎡），日有用得热量大于等于限值为符合，小于限值的为不符合。Daily useful heat gain per unit collector aperture area is a critical indicator for evaluating the energy collection performance of solar water heaters. Under a given solar irradiance, the daily useful heat gain of water in the hot water storage tank per unit collector aperture area shall not be lower than the specified value. This dataset can be used to evaluate the daily useful heat gain of solar water heaters, providing reference and technical support for government supervision and consumer purchasing decisions. 1. Calculation of daily useful heat gain q17 for solar water heaters: The daily useful heat gain q17 is calculated using the following formula: q17 = [17 × cpw × m × (te - tb)] / (Ac × H × 1000000) Where: cpw: specific heat capacity of water, with a fixed value of 4186.8 J/(kg·℃); m: water mass contained in the hot water storage tank, unit: kg; tb: water temperature in the hot water storage tank at the start of the heat collection test, unit: ℃; te: water temperature in the hot water storage tank at the end of the heat collection test, unit: ℃; Ac: collector aperture area, unit: m²; H: cumulative solar irradiance, unit: MJ/m². 2. Data analysis: In accordance with the requirements of GB/T 19141-2011 "Technical Specifications for Domestic Solar Hot Water Systems", under the condition of daily solar irradiance of 17 MJ/m², the daily useful heat gain shall meet the following limit requirements: - Compact and stagnation-solar types: ≥7.7 MJ/m²; - Direct separation types: ≥7.0 MJ/m²; - Indirect separation types: ≥6.6 MJ/m². A solar water heater is considered compliant if its daily useful heat gain is greater than or equal to the specified limit, and non-compliant if it is lower than the limit.