地源热泵温室降温系统的试验研究与性能分析

Experimental investigation and performance analysis on ground source heat pump system for greenhouse cooling

为探索地源热泵降温技术在设施农业领域中的应用途径和发展潜力,以及寻求传统蒸发式降温系统存在设施内湿度较高等问题的解决方法,该文作者在北京地区日光温室中进行了地源热泵温室夏季降温试验研究。该研究以COP即性能系数为评价指标对系统降温性能进行分析,并提出适用于该研究的能量传递和系统性能分析模型。2007年8月17～19日连续观测数据和分析结果显示,地源热泵温室降温系统制冷性能系数(COPsyscg)平均值达到3.01。2007年8月17日为连续观测的3天之中室外日均气温最高的一天,监测数据表明:上午10︰00至下午14︰00室内、外平均气温分别为31.3℃和34.1℃,平均温差2.8℃,同期室内平均相对湿度仅为60.7%,地源热泵系统具有明显的降温和除湿效果。测试期间温室外张挂遮阳幕,遮阳率为70%。

For the purpose of exploring the way and exploiting the potential of ground source heat pump（GSHP）cooling technology for the facility agriculture and solving the problem of high humidity in greenhouse horticulture after using the deeply conventional evaporative cooling method,the authors have carried out the experiment on ground source heat pump system for solar greenhouse cooling in Beijing region was carried out,and put forward some related calculating models of energy transfer and performance analysis for the in summer system was put forward.Analysis results based on the measurements made during Aug.17-19,2007 shown that the coefficient of performance（COP）of the greenhouse cooling system（COPsyscg）reached 3.01 on average.The day of Aug.17 was the hottest one among three days,the analytical result shown that the average air temperature in and outside of greenhouse from 10：00 to 14：00 were 31.3℃and 34.1℃,respectively,and average temperature had reached 2.8℃.Meanwhile,air relative humidity was 60.7%on average in greenhouse,which meand that the GSHP system played an important role in cooling and dehumidifying.Besides,the outside sun shading ratio of PE sunshade screen was 70%.