太阳能-污水热泵沼液增温系统运行模式

针对现有热泵沼液增温系统投资高、运行困难的缺陷，设计了一套太阳能-污水热泵沼液增温系统（solar and untreated sewage source heat pump system，SUSSHPS）.该系统设定3种系统运行模式，分别为全年中温增温模式、全年高温增温模式和夏季高温增温、冬季中温增温模式，并从系统运行能耗、环保性、经济性与产气量最大化角度对各增温模式进行理论计算，同时，构建太阳能-污水热泵沼液增温系统运行模式综合评价体系，运用改进熵值法对评价指标进行综合赋权．研究结果表明，全年中温增温模式、全年高温增温模式和夏季高温增温-冬季中温增温模式的综合评价值分别为0.293 0、0.327 5和0.379 5，夏季高温增温-冬季中温增温模式是三者中最优的运行模式. 

Operation Mode of Solar and Untreated Sewage Source Heat Pump System for Heating Biogas Digesters

A solar and untreated sewage source heat pump system (SUSSHPS) for heating biogas digesters was designed because of the high investment and difficult operation of current heating systems. To determine the optimal operation mode, three operation modes were designed: annual middle-temperature fermentation mode (mode 1), annual high-temperature fermentation mode (mode 2), and summer high-temperature fermentation and winter middle-temperature fermentation mode (mode 3). The three modes were evaluated from four perspectives: energy consumption, environmental protection, economy, and gas production. Finally, a comprehensive evaluation system of SUSSHPS operation mode was built based on comprehensiveness and independence. The evaluation index was a comprehensive weight calculated via an improved entropic coefficient method. The results indicate that model 3 (0.379 5) > model 2 (0.327 5) > model 1 (0.293 0), thus model 3 is the optimal operation mode.