In order to solve the problem that the electrical efficiency of photovoltaic cells decreases with the increase of temperature, and the soil heat imbalance caused by ground source heat pump system heating, the operation performance of the solar photovoltaic/thermal-ground source heat pump （PV/T-GSHP） hybrid heating system is investigated using TRNSYS software. A typical residential building model is used, and the soil temperature, seasonal coefficient of performance for heat pump units （SCOPHP）, photovoltaic electrical efficiency and solar fraction are taken as the evaluation indexes. It is found that： the solar fraction is relatively high in hot summer and cold winter region（take Changsha as a case）, the soil temperature at the end of 20th years is only 0.8 ℃ higher than the initial ground temperature, the SCOPHP is about 5.1 and the solar fraction is 97.0%-98.7%, when the PV/T modules are installed on full of the roof （900 m2）; The solar fraction in different climate regions is related to the area of PV/T modules and the cumulative heat load of building. By defining the index, PV/T module area per accumulated heat load of building, the coupling relationship between the solar fraction and the defined index in different climate regions of China is obtained. In the regression equation, the coefficient of determination, R2, is 0.983. The area of PV/T modules required can be calculated from the regression equation when the building cumulative heat load and solar fraction are known. The annual primary energy consumption of PV/T-GSHP hybrid heating system is significantly less than that of flat panel solar collector and ground source heat pump hybrid heating system （the minimum decrease is in Shenyang, 49.7%）, much less than that of air source heat pump system （the minimum decrease is in Shijiazhuang, 79.8%） and gas wall mounted furnace system （the minimum decrease is in Shenyang, 65.1%）, respectively.
Key words
ground source geothermal heat pumps /
solar cells /
solar fraction /
space heating /
photovoltaic/thermal hybrid system
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 刘仙萍, 饶政华, 廖胜明. 太阳能光伏/光热复合集热器能量转换性能的数值模拟[J]. 中南大学学报(自然科学版), 2013, 44(6): 2554-2560.
LIU X P, RAO Z H, LIAO S M.Numerical simulation of energy conversion performance for hybrid photovoltaic/thermal solar collector[J]. Journal of Central South University(science and technology), 2013, 44(6): 2554-2560.
[2] BAKKER M, ZONDAG H A, ELSWIJK M J, et al.Performance and costs of a roof-sized PV/thermal array combined with a ground coupled heat pump[J]. Solar energy, 2005, 78(2): 331-339.
[3] GUO J Y, BILBAO J I, SPROUL A B.A novel solar cooling cycle - a ground coupled PV/T desiccant cooling (GPVTDC) system with low heat source temperatures[J]. Renewable energy, 2020, 162: 1273-1284.
[4] ENTCHEV E, YANG L, GHORAB M, et al.Energy, economic and environmental performance simulation of a hybrid renewable microgeneration system with neural network predictive control[J]. Alexandria engineering journal, 2018, 57(1): 455-473.
[5] ENTCHEV E, YANG L, GHORAB M, et al.Performance analysis of a hybrid renewable microgeneration system in load sharing applications[J]. Applied thermal engineering, 2014, 71(2): 697-704.
[6] CANELLI M, ENTCHEV E, SASSO M, et al.Dynamic simulations of hybrid energy systems in load sharing application[J]. Applied thermal engineering, 2015, 78: 315-325.
[7] ABU-RUMMAN M, HAMDAN M, AYADI O.Performance enhancement of a photovoltaic thermal (PVT) and ground-source heat pump system[J]. Geothermics, 2020, 85: 101809.
[8] XIA L, MA Z J, KOKOGIANNAKIS G, et al.A model-based design optimization strategy for ground source heat pump systems with integrated photovoltaic thermal collectors[J]. Applied energy, 2018, 214: 178-190.
[9] SOMMERFELDT N, MADANI H.In-depth techno-economic analysis of PV/Thermal plus ground source heat pump systems for multi-family houses in a heating dominated climate[J]. Solar energy, 2019, 190: 44-62.
[10] GURLER T, ELMER T, CUI Y L, et al.Experimental investigation of a novel PVT/heat pump system for energy-efficient poultry houses[J]. International journal of low-carbon technologies, 2018, 13(4): 404-413.
[11] 徐国英, 张小松, 赵善国. 平板型太阳能光伏/光热一体化热泵热水系统特性[J]. 化工学报, 2012, 63(S2): 136-141.
XU G Y, ZHANG X S, ZHAO S G.Performance of flat-plate PV/T integrated heat pump water heating system[J]. CIESC journal, 2012, 63(S2): 136-141.
[12] CAI J J, QUAN Z H, LI T Y, et al.Performance study of a novel hybrid solar PV/T ground-source heat pump system[J]. Procedia engineering, 2017, 205: 1642-1649.
[13] GB 50736—2012, 民用建筑供暖通风与空气调节设计规范[S].
GB 50736—2012, Design code for heating ventilation and air conditioning of civil buildings[S].
[14] GBT 50176—2016, 民用建筑热工设计规范[S].
GBT 50176—2016, Code for thermal design of civil buildings[S].
[15] GB50366—2009, 地源热泵系统工程技术规范(2009版)[S].
GB50366—2009, Technical code for ground-source heat pump system (2009 Ed.)[S].
[16] KÄMPF J H. On the modelling and optimisation of urban energy fluxes[D]. Lausanne, Switzerland: École Polytechnique Fédérale de Lausanne, 2009.
[17] 纪宇乔. 严寒地区深地埋管热泵运行状态土壤平均温度研究[D]. 哈尔滨: 哈尔滨工程大学, 2018.
JI Y Q.The study on soil average temperature of GSHP system with deep heat exchanger operating in extreme cold area[D]. Harbin: Harbin Engineering University, 2018.
PDF(3871 KB)
