太阳能相变蓄热系统在温室加温中的应用

Application of solar-phase change heat storage system in greenhouse

为充分利用太阳能资源提高冬季温室的夜间气温,设计一种太阳能相变蓄热系统。白天利用太阳能集热板吸收太阳辐射并将其转化成热能储存到相变材料内;夜间以空气为热媒将相变材料内的热能输送到温室内,为温室加温。试验结果表明:晴天应用该系统,温室夜间平均气温可提高2.0℃,夜间最低气温提高3.1℃;在不同天气状况的综合条件下应用该系统,温室夜间最低气温平均提高2.5℃,20cm处地温平均提高1.5℃;经计算,晴天条件下,该系统的平均集热效率为59.2%,夜间单位面积放热量为4.05MJ/m2,平均加温热流密度为83.4 W/m2;应用该系统温室增温效果明显。

To make full use of solar energy resource to improve the greenhouse＇s temperature at night in winter,a solarphase change heat storage system is proposed. The system uses solar panel to absorb solar radiation during the day and convert it into heat energy and then stored into phase change material. At night,the heat stored in the phase change material is transferred to the greenhouse use air for greenhouse heating. The results show that.. In sunny days, the greenhouse＇s average temperature at night （18..00- 8：00） is increased by 2.0 13 and the minimum temperature at night increased by 3.1℃; Under different weather conditions, the greenhouse＇ s average minimum temperature is increased by 2.5 13 at night,the underground soil＇s temperature at 20 cm depth in the average is increased by 1.5 ℃ Through calculation,in sunny days, the system~ s average radiation collecting efficiency reached 59.2%, the heat release quantity at night is 4.05 MJ/m^2 and the average warming heat flux density is 83.4 W/m^2 . The research has proved that the system＇s energy conservation effect and heating effect for greenhouse is obvious.