严寒地区生态节能实验楼土壤源热泵供暖系统的实例研究

Case Study on Soil Source Heat Pump Heating System of Ecological Energy Saving Experimental Building in Severe Cold Region

土壤源热泵长期运行过程中由于季节冷热负荷的不平衡性,会产生地下温度场失衡的问题,热泵机组的制热性能系数降低,甚至无法满足严寒地区的供热需求,这一问题在严寒地区更为明显,尤其表现在土壤源热泵只负责冬季供暖,夏季不运行的情况。以生态节能实验楼的能源系统为研究对象,通过对系统整个供暖季的连续实测和数据采集,分析土壤源热泵系统的运行特性,探究实例建筑中土壤源热泵系统的实际供暖效果及其存在的问题,利用SPSS软件对六种因素进行相关性分析,辨识出影响系统运行效果的关键因素,并给出优化建议。结果表明,随着用户侧进出水温差增大,系统的供热量增加,主机COP和系统EER均有不同程度的提高,提升了5%-22%。典型日机组供热量的不达标率仅占16.7%,机组供热量在工作时间均满足供热需求,说明机组的制热能力较好。取热量是对机组性能及室内温度影响最大的因素。

Due to the unbalanced seasonal heating load and cooling load during the long-term operation of the soil source heat pump, the imbalance of the underground temperature field will occur, and the heating performance coefficient of the heat pump unit will be reduced, and even the heating demand in the severe cold area cannot be met. The problem is more obvious in the severe cold area, especially when the soil source heat pump is only responsible for winter heating and does not operate in summer. Take the energy system of the ecological energy-saving experimental building as the research object, by the means of continuous measurement and data acquisition of the entire heating season of the system, analyze the operation characteristics of the soil source heat pump system, and explore the actual heating effect and existing problems of the soil source heat pump system in the example building. The conelation analysis of six factors was carried out by SPSS software, and the key factors affecting the system operation effect were identified, and the optimization suggestions were given. The results show that with the increase of the temperature difference between the inlet and outlet water of the user, the heat supply of the system increases, and the host COP and the system EER are improved to different degrees, which is increased by 5% to 22%. The typical non-standard rate of heat supply for the unit is only 16.7%. The unit's heat supply meets the heating demand during working hours, indicating that the unit's heating capacity is better. Therefore, the heat extraction is the most important factor affecting unit performance and room temperature.