Applicability of heat pump air-conditioning system with groundwater preheating fresh air

doi:10.11949/j.issn.0438-1157.20181165

Abstract

Abstract:

The traditional groundwater source heat pump air conditioning system directly uses groundwater to heat the evaporator of the heat pump unit, and the low-grade thermal energy stored in the groundwater is not effectively utilized. Given those problems, a novel groundwater source heat pump air-conditioning system preheating fresh air with groundwater was proposed. The primary feature of the presented system is the cascade utilization of low-grade energy, namely the novel system preheats fresh air by groundwater at first, then the groundwater is recycled by the heat pump unit for the secondary utilization, which is beneficial to improve the utilization rate of low-grade thermal energy of groundwater and remarkably save energy consumption of heat pump unit. The operational principle of the novel system and air treatment method in the heating mode was analyzed and the hourly heat loads of an academic communication center in the whole heating season (120 days) in four selected typical cities (Wuhan, Changde, Beijing, Zhengzhou) was simulated with DeST, moreover, a comparative study on heating characteristic and energy consumption between the novel system and conventional groundwater source heat pump air-conditioning was conducted. The results showed that the energy consumption of the novel underground water source heat pump air conditioning system is much lower than that of the conventional groundwater source heat pump air conditioning system. The innovative groundwater source heat pump air conditioning system is preferred for hot summer and cold winter area and cold region in China. Moreover, the energy saving rate is more than 50% in each region, and it should be noted that the energy saving effect is better in hot summer and cold winter area than cold region.

摘要：

传统地下水源热泵是直接利用地下水加热蒸发器，没有有效利用地下水低品位热能。为此，提出一种利用地下水预热新风的地源热泵空调系统，实现地下水低品位热能的梯级利用，即先利用地下水预热新风，再进入地下水源热泵机组二次利用，提高了地下水热能的利用率并显著节省机组能耗。分析新系统工作原理及供热空气处理方法，运用DeST软件对夏热冬冷和寒冷地区4个典型城市（武汉、常德、北京、郑州）的某学术交流中心在整个供暖季（120 d）的逐时热负荷进行模拟，并与传统地下水源热泵空调系统的供热特性及能耗进行比较。新系统能耗远远低于传统地下水源热泵空调系统并且适用于我国夏热冬冷地区和寒冷地区，节能率均超过50%，且夏热冬冷地区节能效果更好。

CLC Number:

TK51

WANG Lin, HE Hui, WANG Zhanwei, SONG Zun, LIANG Kunfeng, MA Aihua. Applicability of heat pump air-conditioning system with groundwater preheating fresh air[J]. CIESC Journal, 2018, 69(S2): 485-491.

王林, 何慧, 王占伟, 宋尊, 梁坤峰, 马爱华. 采用地下水预热新风的热泵空调系统的适用性[J]. 化工学报, 2018, 69(S2): 485-491.

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