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An experimental solar assisted heat pump space heating system with a daily energy storage tank is designed and constructed, and its thermal performance is investigated. The heating system basically consists of flat plate solar collectors, a heat pump, a cylindrical storage tank, measuring units, and a heating room located in Gaziantep, Turkey (37.1°N). All measurements are automatically collected as a function of time by means of a measurement chain feeding to a data logger in combination with a PC. Hourly and daily variations of solar radiation, collector performance, coefficient of performance of the heat pump (COPHP), and that of the overall system (COPS) are calculated to evaluate the system performance. The effects of climatic conditions and certain operating parameters on the system performance parameters are investigated. COPHP is about 2.5 for a lower storage temperature at the end of a cloudy day and it is about 3.5 for a higher storage temperature at the end of a sunny day, and it fluctuates between these values in other times. Also, COPS turns out to be about 15–20% lower than COPHP. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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For grain in-store drying, a solar assisted drying process has been developed, which consists of a set including a solar-assisted heat pump, a ventilation system, a grain stirrer, etc. In this way, low power consumption, short cycle time and water content uniformity can be achieved in comparison with the conventional method. A solar-assisted heat pump drying system has been designed and manufactured for a practical granary, and the energy consumption performance of the unit is analyzed. The analysis result shows that the solar fraction of the unit is higher than 20%, the coefficient of performance about system (COPS) is 5.19, and the specific moisture extraction rate (SMER) can reach 3.05 kg/kWh. 相似文献
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介绍了太阳能.热泵联合干燥的目的、意义、设备组成与工作原理,列出了联合干燥设备的主要参数与性能测试数据。绘出了太阳能干燥与联合干燥的工艺曲线。将太阳能-热泵联合干燥与常规蒸汽干燥(又称热风干燥)进行了经济分析对比,联合干燥的节能率在70%左右。 相似文献
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以空气为携热介质的开式太阳能吸收式热泵系统为研究对象，在原有开式制冷循环的基础上，根据冬季蓄能热泵运行特点对系统进行改进；并以北京、西安、兰州3个地区为例，结合当地的气象条件，对循环进行计算并分析影响系统工作性能的因素。 相似文献
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针对由天气变化导致太阳能利用不稳定和寒冷地区热泵性能低的问题,文章介绍了一种基于相变储能的太阳能空气源热泵系统,该系统能够根据气象情况灵活切换4种供暖模式,大大减少了系统耗电量。文章通过独特设计的储能冷凝器,不仅可以调节太阳能空气源热泵系统能量分配,改善太阳能空气源热泵系统制热量和建筑热负荷之间不平衡的供需关系、提高太阳能利用率,还可以提高空气源热泵低温性能,快速恢复供暖,从而实现提高太阳能空气源热泵系统整体性能的目的。文章以石家庄农村某户为研究对象进行研究,研究结果表明,太阳能空气源热泵系统供暖效果较好,太阳能空气源热泵系统COP最大值为5.19,节能环保效益十分明显。 相似文献
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相变贮热在热泵干燥机组中的应用研究 总被引：6，自引：1，他引：6
热泵干燥既能节约能量又可提高产品的质量,当干燥温度满足干燥要求后,热泵干燥机组往往通过排放掉一部分热量来维持干燥温度的稳定,这样降低了热泵干燥的能源利用效率,利用相变材料相变热效应,回收这部分能量,而且又在机组需要热量时将贮存的能量释放给干燥空气,实验结果证明了相变材料在热泵干燥机组中的应用具有明显的节能潜力。 相似文献
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针对冬季太阳能辐射弱且不稳定的特点,提出一种应用于太阳能热泵的分区蓄热水箱,以水泵驱动蓄热水箱循环区与蓄热区的热量传递,并运用热力学原理对水箱循环区与蓄热区的运行状况进行模拟,分析了水箱两区在不同水泵体积流量下的逐时温度变化并与整体式水箱进行对比。结果表明,分区蓄热水箱克服了整体式水箱的热惰性,启动灵活,能在较短时间内达到热泵运行的理想温度,显著提高了系统的性能。 相似文献
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Haifei Chen Guiqiang Li Yunjie Wang Fuwei Zhang Ali Badiei Tao Lu Jie Yang Lvlin Jiang Yang Zhang 《国际能源研究杂志》2020,44(3):2173-2182
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Kami&#x;l Kaygusuz 《国际能源研究杂志》1999,23(14):1213-1223
In order to investigate the performance of the combined solar–heat pump system with energy storage in encapsulated phase change material (PCM) packings for residential heating in Trabzon, Turkey, an experimental set‐up was constructed. The experimental results were obtained from November to May during the heating season for two heating systems. These systems are a series of heat pump system, and a parallel heat pump system. The experimentally obtained results are used to calculate the heat pump coefficient of performance (COP), seasonal heating performance, the fraction of annual load meet by free energy, storage and collector efficiencies and total energy consumption of the systems during the heating season. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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空气回热闭式热泵干燥系统实验研究 总被引：7，自引：0，他引：7
空气闭式热泵干燥装置和加装空气回热器的空气闭式热泵干燥装置的对比试验表明，后者比前者除湿能耗比ＳＰＣ在某些工况下降低达２０％。对两者的循环作了理论分析。 相似文献
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Ali Fouda Sameh A. Nada Abdullah S. Bin Mahfouz A. Al-Zahrani Hassan F. Elattar 《国际能源研究杂志》2020,44(8):6631-6650
In previous investigations, humidification-dehumidification (HDH) solar-assisted desalination systems were designed produce the daily fresh water during sun hours which lead to big sizes and unsteady systems. In the present study, integration of solar-assisted HDH desalination system with heat recovery and thermal energy storage unit is developed to enhance system productivity, reduces auxiliary power consumptions and system size and assure system continuous operation. The mathematical modelling based on energy and mass conservation equations is presented and solved using iterative techniques by C++ and engineering equation solver software. Detailed parametric study of the developed system is conducted for wide ranges of operating conditions and design parameters to study the effects of integrating the HDH system with solar collectors, heat recovery and thermal energy storage units on the system performance. The results revealed that (i) this integration improves system productivity and reduces operating cost, (ii) increasing air to water mass ratio and sea water temperature and decreasing ambient humidity decrease water productivity and gained output ratio (GOR) and increase operating cost parameter (OCP) and (iii) increasing air inlet temperature and sea water flow rates increase GOR and decrease OCP. Comparison with previous systems showed that the proposed system reduces the electric heating power of the system at solar noon by 37% at MR = 0.5 and gives daily fresh water productivity (123.7 kg/h) two times more than previous systems with comparable OCP (0.099 $/kg). 相似文献
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太阳能与热泵技术应用在暖通空调中的进展 总被引：2，自引：1，他引：2
热泵是一项重要的节能技术,但因自身的缺陷使得它的应用遇到一定的困难。随着太阳能利用技术不断进步,太阳能系统集热效率逐渐提高,太阳能与热泵之间可以优势互补的特点逐渐显现。越来越多的专家、学者和企业的工程人员投入到对太阳能技术和热泵技术联合应用的研究之中,并取得了一定的成果。本文综述了太阳能热泵的一般原理及其各种模式控制方案,介绍了目前国内外的研究情况和一些有代表性的成果,并对将来太阳能热泵复合技术的发展进行了一些讨论。 相似文献
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An analytical and computational model for a solar assisted heat pump heating system with an underground seasonal cylindrical storage tank is developed. The heating system consists of flat plate solar collectors, an underground cylindrical storage tank, a heat pump and a house to be heated during winter season. Analytical solution of transient field problem outside the storage tank is obtained by the application of complex finite Fourier transform and finite integral transform techniques. Three expressions for the heat pump, space heat requirement during the winter season and available solar energy are coupled with the solution of the transient temperature field problem. The analytical solution presented can be utilized to determine the annual variation of water temperature in the cylindrical store, transient earth temperature field surrounding the store and annual periodic performance of the heating system. A computer simulation program is developed to evaluate the annual periodic water and earth temperatures and system performance parameters based on the analytical solution. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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Nehad Al-Khalidy 《国际能源研究杂志》1997,21(12):1123-1131
This paper presents an experimental study of energy output and efficiency of solar collectors in a refrigerant ejector refrigeration machine using R113 as the refrigerant. Based on a theoretical study, the oil transformer is used as a working fluid in the solar system. The concentrating collectors show encouraging results for operating the system. The maximum collector efficiency was 20%. The system can be used for both cooling and heating purposes. © 1997 John Wiley & Sons, Ltd. 相似文献