地热水耦合热泵供热系统设计方案差异性分析

介绍地热耦合热泵供热系统(以梯级利用地热水热量为原则,采取地热水直接供热与热泵机组利用地热尾水余热的供热系统)设计方案的工艺流程、运行策略,建立供暖期系统能效比的计算模型。结合算例,在分阶段改变流量的质调节运行方式下,对两种地热耦合热泵供热系统的供暖期系统能效比进行计算。方案1:制热设备(地热水换热器、热泵机组)与供热循环泵采取一机一泵的固定设置。方案2:供热循环泵集中并联设置。对于方案1,供热循环泵与制热设备对应关系固定,启用某台制热设备时必须启用相应的供热循环泵。与方案1相比,由于方案2的供热循环泵集中并联设置,供热循环泵与制热设备的对应关系相对松散,匹配更加灵活。方案1、2的供暖期系统能效比分别为9.20、10.03。与方案1相比,方案2的供暖期系统能效比提高9%。

Analysis on Difference of Design Schemes of Geothermal Water Coupled Heat Pump Heating System

The process flow and operation strategy of the design schemes of the geothermal water coupled heat pump heating system( based on the principle of cascade utilization of geothermal water heat,the heating system adopts geothermal water direct heating and heat pump unit utilizing waste heat of geothermal tail water) are introduced. The calculation model of system energy efficiency in heating period is established. Combined with the calculation example,the system energy efficiency of two geothermal water coupled heat pump heating systems during the heating period is calculated under the operation mode of centralized regulation with flow varied by steps. Scheme 1:The heating equipment( geothermal water heat exchanger and heat pump unit) and the heating circulation pump adopt a fixed arrangement of one machine and one pump. Scheme 2: centralized parallel arrangement of heating circulation pumps. For the scheme 1,the corresponding relationship between the heating circulation pump and the heating equipment is fixed,and the corresponding heating circulation pump must be activated when a certain heating equipment is activated.Compared with the scheme 1,because the heating circulation pumps of the scheme 2 are centrally arranged in parallel,the corresponding relationship between the heating circulation pump and the heating equipment is relatively loose,and the matching is more flexible. The system energy efficiencies of the schemes 1 and 2 during the heating period are 9. 20 and 10. 03,respectively. Compared with the scheme 1,the system energy efficiency ratio of the scheme 2 during the heating period is increased by 9%.