太阳能-地源热泵沼气池加热系统集热面积优化

摘要

针对集中供气型沼气工程加温需求和地源热泵式系统存在地下侧土壤温度回补问题,提出了太阳能-地源热泵复合式沼气池加热系统(ISGSHPS),并从经济和环保两方面将该系统与地源热泵和电热膜加热系统进行分析比较得出系统的最优太阳能集热面积.结果表明:最优集热面积主要与每年总加热时间、电价有关.系统最经济加热时间段为每年10月至次年5月;在电价低于0.5元/(kW·h)时,ISGSHPS不如单独的地源热泵系统经济;在电价0.5～1.0元/(kW·h)和高于1.0元/(kW·h)时,ISGSHPS的最优集热面积分别为24 m2和32 m2.目前,最合理的太阳能投资面积为24 m2,生命周期为20年的ISGSHPS相对地源热泵和电热膜系统总节约费用分别为10 830元和59 244元,CO2,减排量约为74 t和266 t,有较大的投资潜力.%To address the problem of heating biogas project and compensating the lost ground temperature of ground source heat pump system, the integrated solar and ground source heat pump system (ISGSHPS) was presented for heating biogas digester, and the economic and environmental performance of ISGSHPS with that of ground source heat pump and electricity heat membrane system were compared to obtain the optimal solar collector area. The results show that the optimal solar collector area is related to annual total running hours and electricity price. The most economic running period is from October to the next May; ground source heat pump system is more economical than ISGSHPS when electricity price is lower than0. 5 Yuan per kW·h; when the electricity price is between 0. 5 and 1. 0 Yuan per kW ? H or higher than1. 0 Yuan per kW-h, the optimal solar collector area of ISGSHPS is 24 m and 32 m respectively. At present, the optimum collector area is 24 m2 , under which total cost saving in 20 years is 10 830 Yuan and 59 244 Yuan, and carbon dioxide emissions could be reduced about 74 t and 266 t by comparison ISGSHPS with ground source heat pump and electricity heat membrane system. Therefore, this system has potential to develop.