针对花卉温室中地源热泵系统土壤热失衡导致的热泵机组制热性能逐年下降的问题,提出了一种地埋管分区跨季节蓄热的光伏光热耦合地源热泵(photovoltaic/thermal-ground source heat pump,PV/T-GSHP)系统,通过20 a的仿真模拟,对无蓄热、...针对花卉温室中地源热泵系统土壤热失衡导致的热泵机组制热性能逐年下降的问题,提出了一种地埋管分区跨季节蓄热的光伏光热耦合地源热泵(photovoltaic/thermal-ground source heat pump,PV/T-GSHP)系统,通过20 a的仿真模拟,对无蓄热、全年全区蓄热与各跨季分区蓄热模式的运行特性进行了深入研究。研究结果表明:跨季分区蓄热模式通过对土壤温度的提升,实现了热泵机组制热性能系数(coefficient of performance for heating,COP_(h))、年均热泵机组性能系数(mean annual coefficient of performance,COP_(m))与年均系统性能系数(mean annual coefficient of performance of the system,COP_(msys))较全年全区蓄热模式的进一步提高,计算得到的COP_(h)、COP_(m)与COP_(msys)平均增幅分别为3.9%、3.0%与7.1%;最佳蓄热模式的COP_(m)与COP_(msys)较无蓄热模式分别提高了7.7%和50.1%,COP_(msys)与太阳能保证率较全年全区蓄热模式分别提高了9.2%和7.8%,消耗的燃煤量较全年全区蓄热模式降低了6.8%。该研究可为花卉温室中PV/T-GSHP系统的高效节能运行提供借鉴。展开更多
Ground source heat pump systems demonstrate significant potential for northern rural heating applications;however,the effectiveness of these systems is often limited by challenging geological conditions.For instance,i...Ground source heat pump systems demonstrate significant potential for northern rural heating applications;however,the effectiveness of these systems is often limited by challenging geological conditions.For instance,in certain regions,the installation of buried pipes for heat exchangers may be complicated,and these pipes may not always serve as efficient low-temperature heat sources for the heat pumps of the system.To address this issue,the current study explored the use of solar-energy-collecting equipment to supplement buried pipes.In this design,both solar energy and geothermal energy provide low-temperature heat to the heat pump.First,a simulation model of a solar‒ground source heat pump coupling system was established using TRNSYS.The accuracy of this model was validated through experiments and simulations on various system configurations,including varying numbers of buried pipes,different areas of solar collectors,and varying volumes of water tanks.The simulations examined the coupling characteristics of these components and their influence on system performance.The results revealed that the operating parameters of the system remained consistent across the following configurations:three buried pipes,burial depth of 20 m,collector area of 6 m^(2),and water tank volume of 0.5 m^(3);four buried pipes,burial depth of 20 m,collector area of 3 m^(2),and water tank volume of 0.5 m^(3);and five buried pipes with a burial depth of 20 m.Furthermore,the heat collection capacity of the solar collectors spanning an area of 3 m^(2)was found to be equivalent to that of one buried pipe.Moreover,the findings revealed that the solar‒ground source heat pump coupling system demonstrated a lower annual cumulative energy consumption compared to the ground source heat pump system,presenting a reduction of 5.31%compared to the energy consumption of the latter.展开更多
文摘针对花卉温室中地源热泵系统土壤热失衡导致的热泵机组制热性能逐年下降的问题,提出了一种地埋管分区跨季节蓄热的光伏光热耦合地源热泵(photovoltaic/thermal-ground source heat pump,PV/T-GSHP)系统,通过20 a的仿真模拟,对无蓄热、全年全区蓄热与各跨季分区蓄热模式的运行特性进行了深入研究。研究结果表明:跨季分区蓄热模式通过对土壤温度的提升,实现了热泵机组制热性能系数(coefficient of performance for heating,COP_(h))、年均热泵机组性能系数(mean annual coefficient of performance,COP_(m))与年均系统性能系数(mean annual coefficient of performance of the system,COP_(msys))较全年全区蓄热模式的进一步提高,计算得到的COP_(h)、COP_(m)与COP_(msys)平均增幅分别为3.9%、3.0%与7.1%;最佳蓄热模式的COP_(m)与COP_(msys)较无蓄热模式分别提高了7.7%和50.1%,COP_(msys)与太阳能保证率较全年全区蓄热模式分别提高了9.2%和7.8%,消耗的燃煤量较全年全区蓄热模式降低了6.8%。该研究可为花卉温室中PV/T-GSHP系统的高效节能运行提供借鉴。
基金supported by 2024 Central Guidance Local Science and Technology Development Fund Project"Study on the mechanism and evaluation method of thermal pollution in water bodies,as well as research on thermal carrying capacity".(Grant 246Z4506G)Key Research and Development Project in Hebei Province:"Key Technologies and Equipment Research and Demonstration of Multiple Energy Complementary(Electricity,Heat,Cold System)for Solar Energy,Geothermal Energy,Phase Change Energy"(Grant 236Z4310G)the Hebei Academy of Sciences Key Research and Development Program"Research on Heat Transfer Mechanisms and Efficient Applications of Intermediate and Deep Geothermal Energy"(22702)。
文摘Ground source heat pump systems demonstrate significant potential for northern rural heating applications;however,the effectiveness of these systems is often limited by challenging geological conditions.For instance,in certain regions,the installation of buried pipes for heat exchangers may be complicated,and these pipes may not always serve as efficient low-temperature heat sources for the heat pumps of the system.To address this issue,the current study explored the use of solar-energy-collecting equipment to supplement buried pipes.In this design,both solar energy and geothermal energy provide low-temperature heat to the heat pump.First,a simulation model of a solar‒ground source heat pump coupling system was established using TRNSYS.The accuracy of this model was validated through experiments and simulations on various system configurations,including varying numbers of buried pipes,different areas of solar collectors,and varying volumes of water tanks.The simulations examined the coupling characteristics of these components and their influence on system performance.The results revealed that the operating parameters of the system remained consistent across the following configurations:three buried pipes,burial depth of 20 m,collector area of 6 m^(2),and water tank volume of 0.5 m^(3);four buried pipes,burial depth of 20 m,collector area of 3 m^(2),and water tank volume of 0.5 m^(3);and five buried pipes with a burial depth of 20 m.Furthermore,the heat collection capacity of the solar collectors spanning an area of 3 m^(2)was found to be equivalent to that of one buried pipe.Moreover,the findings revealed that the solar‒ground source heat pump coupling system demonstrated a lower annual cumulative energy consumption compared to the ground source heat pump system,presenting a reduction of 5.31%compared to the energy consumption of the latter.
