太阳能-地源热泵式沼气工程加温系统TRNSYS模拟

利用TRNSYS软件对太阳能-地源热泵式沼气工程加温系统进行仿真模拟,得出该系统某一典型天和全年能量利用效果:在冬季最冷的典型一天,总供热包括热泵耗电量、水泵耗电量、地埋管和集热器总集热量共225.52 MJ/d;总耗热包括沼气池维护结构散热和加温料液负荷共208.57 MJ/d。除去无供热效果的水泵耗电部分,能量输入和沼气池热负荷基本趋于平衡;系统全年共消耗热量46 657.32 MJ,可再生能源(太阳能和地热能)提供74%;其中,太阳能热利用贡献63%,地热能贡献37%,表明该加温系统可高效利用可再生能源。系统全年向地下蓄热总量为7 630.99 MJ,吸热总量为12 954.81 MJ,蓄热量虽不能完全满足供热量的需求,但可以在一定程度上缓解土壤的冷热失衡。

TRNSYS Simulation of Integrated Solar and Ground Source Heat Pump for Biogas Digester Heating System

The energy structure of energy supply project always adopts traditional and renewable energy together for the past years. However, for the future development, renewable energy will gradually increase the proportion, or even completely replace the traditional energy. The actual energy supply engineering energy utilization effect is worthy of attention. There are two schemes to discuss: engineering test and software simulation. Engineering test will be time-consuming, while software simulation can save a great deal of costs, as well as carry out the design and verification of various control schemes. Therefore, the integrated solar-ground source heat pump for biogas digester heating system simulation was studied. The typical day and year energy utilization effects of the heating system were obtained by using TRNSYS platform with Type109-TMY2 (reader and meteorological data processor), Type71 (vacuum tube solar collector), Type60 (storage tank), Type3b (circulating pump), Type60c (methane), Type668 (heat pump), Type557b (buried pipe), Type14h (operation controller), Type25a (print results) modules. Results showed that in the typically coldest winter day, the total heat supplying capacity was 225.52MJ/d, which included heat pump power consumption (57.24MJ/d), water pump power consumption (13.39MJ/d), buried tube (71.93MJ/d) and solar collector (82.96MJ/d). The total heat dissipation capacity was 208.57MJ/d, which contained biogas pool maintenance structure heat (132MJ/d) and liquid heating load (76.57MJ/d). The annual total heat consumption of the system was 46657.32MJ, the renewable energy included solar contribution (63%) and geothermal contribution (37%), which accounted for 74%. It showed that renewable energy sources were efficiently utilized in the heating system. Furthermore, the system can store 7630.99MJ/a of heat to the ground but the heat absorption capacity was 12954.81MJ/a. Although the heat storage capacity cannot meet the demand of heat supply, it can alleviate the cold and hot imbalance of soil to some extent.