Journal
JOURNAL OF ENERGY STORAGE
Volume 54, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.est.2022.105298
Keywords
Greenhouse heating; Ground source heat pump; Thermal imbalance; Seasonal solar thermal energy storage; Diurnal solar thermal energy storage
Categories
Funding
- National Natural Science Foundation of China [52106073, 52076015, 51936001]
- Scientific Research Project of Beijing Municipal Education Commission [KM202110017006, 22019821001, 6142702190408]
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This study presents a demonstration project of a ground source heat pump heating system with seasonal and diurnal solar thermal energy storage for greenhouse heating. Experimental results show that this heating system has advantages for greenhouses in cold regions and improves system performance.
In this study, a demonstration project of a ground source heat pump (GSHP) heating system with seasonal solar thermal energy storage (SSTES) and diurnal solar thermal energy storage (DSTES) is constructed for greenhouse heating. In the non-heating season, the SSTES overcomes the thermal imbalance of GSHP heating for agricultural greenhouses. While in the heating season, the DSTES undertakes part of the heating load of greenhouses, reduces GSHP heating electric energy consumption and improves the annual coefficient of performance of heating system COPsys,y. The experimental data illustrate that the soil temperature of ground heat exchanger (GHE) area is about 0.3 K higher than the initial soil temperature at the end of SSTES, and the COPsys,y of the proposed heating system is 14.3 % higher than that of bank control experiment. The above results demonstrate that the proposed heating system is favorable for greenhouses in cold regions. Further, coupling DSTES can reduce the rated capacity of GSHP and the total length of GHE tube for the newly designed heating system. In addition, the recommended values of two key operating parameters are given based on the experimental data. This study can shed a light on clean and efficient heating for greenhouses in cold regions and provide data support for related research.
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