共查询到19条相似文献,搜索用时 218 毫秒
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长春地区地下土壤导热系数低,长时间采用地源热泵来供暖,热泵的效率较低。通过对长春地区太阳能资源分布规律的分析,从技术性、经济性方面对太阳能辅助地源热泵供热与单独采用地源热泵供热进行比较。结果表明:太阳能辅助地源热泵供热方案效果良好、经济可行。因此,在长春地区,利用太阳能辅助地源热泵供热是完全可行的。 相似文献
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为了解决严寒地区供热结构单一及远离城市集中供热的建筑供暖问题,实现热泵及太阳能清洁能源的推广应用,对近年来严寒地区清洁供热系统的研究与应用进行总结,分析目前存在的主要问题。在研究总结空气源热泵、土壤源热泵、太阳能集热器及多热源联合运行方案及节能效益的基础上,探讨严寒地区多源互补供热系统的构建基本思想,为今后该地区热泵与太阳能供热系统设计和应用提供参考。 相似文献
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为解决太阳电池的发电效率随温度升高而下降以及地源热泵系统供热引起的土壤热失衡问题,以典型居住建筑的光伏/光热-地源热泵(PV/T-GSHP)联合供热系统为研究对象,基于TRNSYS软件,采用土壤温度、地源热泵机组季节能效比、光伏发电效率和太阳能保证率为评价指标,对该联合供热系统进行运行性能分析。研究结果表明:夏热冬冷地区(以长沙为例)太阳能保证率相对较高,PV/T组件面积为满屋顶最大化安装(900 m2)时,第20年末土壤温度相比初始地温仅升高0.8 ℃,热泵机组季节能效比约为5.1,太阳能保证率为97.0%~98.7%;不同气候地区的太阳能保证率与PV/T组件面积和建筑全年累计供热量有关,通过定义单位建筑全年累计供热量PV/T组件面积指标,得到中国不同气候地区的太阳能保证率与该指标的耦合关系,回归方程的决定系数R2为0.983,得出在已知建筑全年累计供热量和太阳保证率设计目标值的条件下所需PV/T组件面积的计算方法。PV/T-GSHP联合供热系统的全年运行能耗显著小于平板太阳能集热器-地源热泵联合系统(最小降幅为沈阳,49.7%),远小于空气源热泵(最小降幅为石家庄,79.8%)和燃气壁挂炉(最小降幅为沈阳,65.1%)。 相似文献
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在西安地区一座日光温室中采用太阳能联合空气源热泵供热系统进行对比实验研究,比较太阳能联合空气源热泵系统改善温室内的温度、湿度及土壤温度等环境因素,分析评价太阳能联合空气源热泵系统在日光温室冬季应用的效果。实验结果表明:太阳能联合空气源热泵供热系统不仅可明显提高温室内的空气温度和土壤温度,还可有效降低温室内的湿度;在实验天气条件下,热泵单独供热时,系统的COP为2.2~3.5;太阳能联合空气源热泵供热时,系统的COP为2.9~6.0;相比于阴天工况,晴天条件下,太阳能蓄热供热时间较长,热泵补充供热时间缩短,系统COP较高。 相似文献
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太阳能辅助地源热泵供热运行特性研究,我国农业生物质能发展战略思考,中国可再生能源产业概况,模糊理论在风力发电机组故障诊断中的应用,生物质粉体水蒸气催化气化实验研究[编者按] 相似文献
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Ronak Daghigh Mohd Hafidz Ruslan Mohamad Yusof Sulaiman Kamaruzzaman Sopian 《Renewable & Sustainable Energy Reviews》2010,14(9):2564-2579
Combining solar energy and heat pump technology is a very attractive concept. It is able to eliminate some difficulties and disadvantages of using solar dryer systems or solely using heat pump drying separately. Solar assisted heat pump drying systems have been studied and applied since the last decades in order to increase the quality of products where low temperature and well-controlled drying conditions are needed. This paper reviewed studies on the advances in solar heat pump drying systems. Results and observation from the studies of solar assisted heat pump dryer systems indicated that for heat sensitive materials; improved quality control, reduced energy consumption, high coefficient of performance and high thermal efficiency of the dryer were achieved. The way forward and future directions in R&D in this field are further research regarding theoretical and experimental analysis as well as for the replacement of conventional solar dryer or heat pump dryer with solar assisted heat pump drying systems and solar assisted chemical and ground source heat pump dryers which should present energy efficient applications of the technologies. 相似文献
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为缩短枸杞干燥时间,提高干制枸杞的质量,减少能源消耗,本文提出了一种新型太阳能–空气源热泵联合干燥系统。该系统主要由太阳能集热器和空气源热泵机组等设备组成,可以实现太阳能单独干燥、热泵单独干燥和太阳能–空气源热泵联合干燥三种工作模式。本文根据枸杞的干燥特性,分段设定最佳的干燥温度,进行了热泵单独运行和太阳能–热泵联合运行两种工作模式下干燥枸杞的对比实验。结果表明,干燥50 kg枸杞,太阳能–热泵联合运行比热泵单独运行节省了2.9 kW?h电能,若同时除去系统本身的耗能,节省的电能占热泵单独运行耗电量的29.5%。同时,与太阳能单独干燥相比,太阳能–热泵联合干燥具有较高的除湿能耗比,两者最大差值为0.71 kg/(kW?h)。本文提出的太阳能–热泵联合干燥系统具有提高干燥产品的品质、缩短干燥时间和节约干燥成本等优点,适宜推广。 相似文献
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Analysis of solar aided heat pump systems with seasonal thermal energy storage in surface tanks 总被引:2,自引:0,他引:2
Annual periodic performance of a solar assisted ground-coupled heat pump space heating system with seasonal energy storage in a hemispherical surface tank is investigated using analytical and computational methods. The system investigated employs solar energy collection and dumping into a seasonal surface tank throughout the whole year with extraction of thermal energy from the tank for space heating during the winter season. A computational model is presented in this study for the prediction of the annual periodic transient behaviour of the system under investigation. The present computational model is based on a hybrid analytical–numerical procedure which facilitates determination of the annual variation of water temperature in the surface tank, the amounts of solar thermal energy collected during each month and the annual periodic performance of the solar aided space heating system. 相似文献
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The feasibility of solar assisted heat pump systems for space heating and domestic hot water preheating in Canada is examined by simulating the performance of these systems on a computer using the program WATSUN. Simulations are carried out using meteorological data for seven representative Canadian cities, two different building types, and six types of system configurations. For the solar assisted heat pump system, twenty year life cycle cost comparisons are made with two reference systems, namely a conventional resistance heating system and an air-to-air heat pump system, based on current economic parameters and projected escalation scenarios for electricity rates.Results of the study show that the solar assisted heat pump systems conserve significant amounts of energy over resistance heating and heat pump systems. On the life cycle unit cost basis, solar assisted heat pump systems costs are relatively insensitive to location, but the dependence on building types is substantial with multiplex dwellings showing the least cost. Liquid based dual source solar assisted heat pump systems are found to be cost effective over resistance heating (but not over an air-to-air heat pump system) at some of the locations for multiplex units. They are not cost effective for single family dwellings at the present time. 相似文献
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ABSTRACTA numerical model has been proposed in this research work for predicting the energy performance of a heat pump assisted regenerative solar still using phase change heat storage materials such as paraffin wax and hydrate salt. The numerical model is based on energy and mass balance. The performance was simulated for Fort Sherchenko town in Kazakhstan. The performance comparison between the conventional solar still and heat pump assisted regenerative solar still with and without phase change materials are presented. Moreover, the influence of two different phase change materials on thermal performance of a heat pump assisted regenerative solar still are described. The numerical simulation results showed that heat pump assisted regenerative solar still is more energy efficient and produces better productivity when compared to the conventional simple solar still. The use of hydrate salt phase change heat storage material was found to be a good option for enhancing the performance of a heat pump assisted regenerative solar still. 相似文献