夏热冬冷地区太阳能光伏/光热-地源热泵联合供热系统运行性能模拟

来源期刊:中南大学学报(自然科学版)2021年第6期

论文作者:廖胜明 刘仙萍 雷豫豪 田东 郝小礼

文章页码:1892 - 1901

关键词:光伏/光热一体化;地源热泵;联合供热系统;TRNSYS软件

Key words:hybrid photovoltaic/thermal; ground source heap pump; hybrid heating system; TRNSYS software

摘    要:以夏热冬冷地区的典型居住建筑为例,利用TRNSYS软件研究光伏/光热-地源热泵(PV/T-GSHP)联合供热系统的运行性能以及主要设计参数(PV/T组件面积、地埋管间距和地埋管长度)对联合供热系统运行性能的影响。研究结果表明:PV/T-GSHP联合供热系统能有效保证土壤热平衡,系统运行20 a后土壤温度仅增加0.8 ℃;PV/T-GSHP联合供热系统的热泵机组季节能效比相对于传统地源热泵(GSHP)系统提高43.8%,与独立光伏(PV)系统相比,PV/T组件的光伏电池最高温度降低约35 ℃;当PV/T组件面积增加至屋顶面积的2/3时,热泵出水温度大于5 ℃;当PV/T组件满屋顶安装时,太阳能保证率接近100%;地埋管间距对PV/T-GSHP联合供热系统的太阳能保证率影响很小,可以忽略;在不同的PV/T组件面积下,热泵机组季节能效比均随地埋管长度增加而小幅度上升。

Abstract: Based on the TRNSYS software and a typical residential building in the hot summer and cold winter zone, the operation performance and main design parameters(PV/T module areas, gaps and lengths of ground pipes) for photovoltaic/thermal-ground source heat pump(PV/T-GSHP) hybrid heating system were analyzed. The results show that the soil heat balance can be well guaranteed by the PV/T-GSHP hybrid heating system, and the soil temperature only increases by 0.8 ℃ after 20 years of operation. The seasonal COP of heat pump unit increases by 43.8% compared with that of the traditional GSHP system, and the annual peak temperature of PV cells decreases by 35 ℃ compared with that of the stand-alone PV system. The outlet water temperature of the heat pump unit is greater than 5 ℃ when the PV/T module area is 2/3 of the roof area. When the PV/T module area is full of the roof, the solar fraction is close to 100%, and the influence of ground pipe gaps on solar fraction of PV/T-GSHP hybrid heating system is small enough to be ignored. The seasonal COP of heat pump unit increases slightly with the increase of buried pipe length in different PV/T module areas.

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