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
This paper presents an experimental analysis of a solar-assisted powered underfloor heating system,designed primarily to boost energy efficiency and achieve reliable desired steady-state temperature in buildings.We th...This paper presents an experimental analysis of a solar-assisted powered underfloor heating system,designed primarily to boost energy efficiency and achieve reliable desired steady-state temperature in buildings.We thoroughly tested the system’s thermal and operational features by subjecting it to three distinct scenarios that mimicked diverse solar irradiance and environmental conditions.Our findings reveal a strong correlation between variations in solar input and overall system performance.The Solar Fraction(SF),our key energy efficiency metric,varied significantly across the cases,ranging from 63.1%up to 88.7%.This high reliance on renewables resulted in a substantial reduction in backup power;consequently,the auxiliary electric heater was only required to supply between 1.82 and 3.00 kWh over the test periods.The circulation pump operated on a precise control logic,engaging below 20℃ and disengaging at 21℃.Crucially,the experiments verified the system’s ability not only tomeet the air temperature setpoint but also to ensure the floor surface temperature stayed within required international comfort criteria.These robust results directly support the study’s main objective.For practical application,we advise increasing the total length of the embedded pipe network.This crucial adjustment would allow for a reduction in the required circulating water temperature,which in turn maximizes the utilization of low-grade solar heat and optimizes radiant heat delivery toward achieving the desired steady-state temperature.Ultimately,the study confirms that solar-assisted underfloor heating offers a technically viable,sustainable,and energy-efficient solution with the potential to significantly cut fossil fuel consumption.展开更多
随着全球人口快速增长以及工业化快速发展,淡水资源越来越短缺。海水淡化被认为是很有前途的技术,但传统的海水淡化技术不可避免地消耗化石燃料,因此,太阳能作为清洁能源驱动界面水蒸发受到广泛关注。文章以聚丙烯腈(PAN)作为输水材料...随着全球人口快速增长以及工业化快速发展,淡水资源越来越短缺。海水淡化被认为是很有前途的技术,但传统的海水淡化技术不可避免地消耗化石燃料,因此,太阳能作为清洁能源驱动界面水蒸发受到广泛关注。文章以聚丙烯腈(PAN)作为输水材料、碳纳米管(CNT)作为光热材料,通过制备不同工艺参数的静电纺纳米纤维膜,揭示不同静电纺丝工艺参数对太阳能蒸发器光热性能的影响。实验表明,当纺丝时间为60 min、纺丝电压为19 k V、CNT质量分数为2.0%时,制备的PAN/CNT纤维膜展现出最佳蒸发性能。在这一参数组合下,静电纺纳米纤维膜在模拟太阳光照射下的水蒸发速率达到了最高值。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。
文摘This paper presents an experimental analysis of a solar-assisted powered underfloor heating system,designed primarily to boost energy efficiency and achieve reliable desired steady-state temperature in buildings.We thoroughly tested the system’s thermal and operational features by subjecting it to three distinct scenarios that mimicked diverse solar irradiance and environmental conditions.Our findings reveal a strong correlation between variations in solar input and overall system performance.The Solar Fraction(SF),our key energy efficiency metric,varied significantly across the cases,ranging from 63.1%up to 88.7%.This high reliance on renewables resulted in a substantial reduction in backup power;consequently,the auxiliary electric heater was only required to supply between 1.82 and 3.00 kWh over the test periods.The circulation pump operated on a precise control logic,engaging below 20℃ and disengaging at 21℃.Crucially,the experiments verified the system’s ability not only tomeet the air temperature setpoint but also to ensure the floor surface temperature stayed within required international comfort criteria.These robust results directly support the study’s main objective.For practical application,we advise increasing the total length of the embedded pipe network.This crucial adjustment would allow for a reduction in the required circulating water temperature,which in turn maximizes the utilization of low-grade solar heat and optimizes radiant heat delivery toward achieving the desired steady-state temperature.Ultimately,the study confirms that solar-assisted underfloor heating offers a technically viable,sustainable,and energy-efficient solution with the potential to significantly cut fossil fuel consumption.
文摘随着全球人口快速增长以及工业化快速发展,淡水资源越来越短缺。海水淡化被认为是很有前途的技术,但传统的海水淡化技术不可避免地消耗化石燃料,因此,太阳能作为清洁能源驱动界面水蒸发受到广泛关注。文章以聚丙烯腈(PAN)作为输水材料、碳纳米管(CNT)作为光热材料,通过制备不同工艺参数的静电纺纳米纤维膜,揭示不同静电纺丝工艺参数对太阳能蒸发器光热性能的影响。实验表明,当纺丝时间为60 min、纺丝电压为19 k V、CNT质量分数为2.0%时,制备的PAN/CNT纤维膜展现出最佳蒸发性能。在这一参数组合下,静电纺纳米纤维膜在模拟太阳光照射下的水蒸发速率达到了最高值。
