First and Second Law analyses were conducted to evaluate the performance of a closed latent heat thermal energy storage (LHTES) system employing calcium chloride hexahydrate (CaCl2-6H2O).The First and the Second Laws ...First and Second Law analyses were conducted to evaluate the performance of a closed latent heat thermal energy storage (LHTES) system employing calcium chloride hexahydrate (CaCl2-6H2O).The First and the Second Laws of thermodynamics were applied to the system from viewpoint of energy and exergy analyses,respectively. The energy storage tank in the system is neither fully mixed nor fully stratified. It may be considered as semithermal stratified. Experiments that include both charging and discharging periods were performed on sunny winter days in 1996. The energy and exergy variations and the overall energy and exergy efficiencies of the closed LHTES system were calculated for the complete charging and discharging cycle of the selected fifteen clear-sky winter days. Mean energy and exergy efficiencies were found to be 55.20% and 34.83%, respectively.展开更多
Based on experimental data, the energy storage performances of floor radiant heating system were investigated. The decrease of indoor air temperature after the stopping of floor heating was compared with that of fan-c...Based on experimental data, the energy storage performances of floor radiant heating system were investigated. The decrease of indoor air temperature after the stopping of floor heating was compared with that of fan-coil heating system. The increase of indoor air temperature after the stopping of floor cooling system was analyzed. The results show that the floor heating system has good thermal storage performance, which can be used to a night-running model to obtain the energy-saving benefits efficient and economic running cost, and still can be used for “shifting peak load to off-peak” macroscopically.展开更多
In this paper, heating and heat storage in passive solar heating room with greenhouse has been studied. The unsteady numerical simulation is employed to analyze the performance of the flow and temperature field for th...In this paper, heating and heat storage in passive solar heating room with greenhouse has been studied. The unsteady numerical simulation is employed to analyze the performance of the flow and temperature field for the typical sunny day of Wuhan, China, in winter in the heating system. The floor of passive solar heating room with a convective hole or not has great effects on temperature distribution and gas flow in heat storage layer of this system. Properties of the bed worked as solar absorber and storage layer have also been studied.展开更多
为推动清洁能源的开发利用,减少碳排放,服务国家清洁取暖试点城市建设,以开封市区为例,评价分析了开封凹陷区深层地热资源。根据研究区内存在的开封断裂和祥符—刘店断裂,把研究区切割为4个区块进行研究,计算得出,新生界热储储存热水资...为推动清洁能源的开发利用,减少碳排放,服务国家清洁取暖试点城市建设,以开封市区为例,评价分析了开封凹陷区深层地热资源。根据研究区内存在的开封断裂和祥符—刘店断裂,把研究区切割为4个区块进行研究,计算得出,新生界热储储存热水资源总量为107.47×10^(10) m 3;地热储存热量为439.90×10^(18) J。根据《地热资源地质勘查规范》(GB 11615—2010)对地热田规模的划分,得出3个大型地热田,分别为新近系明化镇组热储、新近系馆陶组热储和古近系热储。研究确保地热能安全可持续开发利用,推进清洁能源开发利用进程;可为后期城市发展规划和建设项目布井方案(采灌井比、采灌井间距)提供地热能源利用技术依据。展开更多
文摘First and Second Law analyses were conducted to evaluate the performance of a closed latent heat thermal energy storage (LHTES) system employing calcium chloride hexahydrate (CaCl2-6H2O).The First and the Second Laws of thermodynamics were applied to the system from viewpoint of energy and exergy analyses,respectively. The energy storage tank in the system is neither fully mixed nor fully stratified. It may be considered as semithermal stratified. Experiments that include both charging and discharging periods were performed on sunny winter days in 1996. The energy and exergy variations and the overall energy and exergy efficiencies of the closed LHTES system were calculated for the complete charging and discharging cycle of the selected fifteen clear-sky winter days. Mean energy and exergy efficiencies were found to be 55.20% and 34.83%, respectively.
文摘Based on experimental data, the energy storage performances of floor radiant heating system were investigated. The decrease of indoor air temperature after the stopping of floor heating was compared with that of fan-coil heating system. The increase of indoor air temperature after the stopping of floor cooling system was analyzed. The results show that the floor heating system has good thermal storage performance, which can be used to a night-running model to obtain the energy-saving benefits efficient and economic running cost, and still can be used for “shifting peak load to off-peak” macroscopically.
文摘In this paper, heating and heat storage in passive solar heating room with greenhouse has been studied. The unsteady numerical simulation is employed to analyze the performance of the flow and temperature field for the typical sunny day of Wuhan, China, in winter in the heating system. The floor of passive solar heating room with a convective hole or not has great effects on temperature distribution and gas flow in heat storage layer of this system. Properties of the bed worked as solar absorber and storage layer have also been studied.
文摘为推动清洁能源的开发利用,减少碳排放,服务国家清洁取暖试点城市建设,以开封市区为例,评价分析了开封凹陷区深层地热资源。根据研究区内存在的开封断裂和祥符—刘店断裂,把研究区切割为4个区块进行研究,计算得出,新生界热储储存热水资源总量为107.47×10^(10) m 3;地热储存热量为439.90×10^(18) J。根据《地热资源地质勘查规范》(GB 11615—2010)对地热田规模的划分,得出3个大型地热田,分别为新近系明化镇组热储、新近系馆陶组热储和古近系热储。研究确保地热能安全可持续开发利用,推进清洁能源开发利用进程;可为后期城市发展规划和建设项目布井方案(采灌井比、采灌井间距)提供地热能源利用技术依据。
