空气源热泵辅助太阳能热水系统在江淮地区的应用潜力研究

针对江淮地区气候条件,对比分析空气源热泵辅助太阳能热水系统与其他几种系统热水供应方式的年运行能耗、热水费用、污染物排放量等指标,探讨该系统在江淮地区应用推广的价值。     

直膨式太阳能热泵系统的模型仿真

考虑了集热器中制冷剂压降的存在,利用平衡均相理论建立了太阳能集热/蒸发器的两相流模型,同时建立了压缩机、冷凝器的数学模型.从理论上分析了集热器中制冷剂的压降、集热器的类型、集热面积、太阳能辐照度、环境温度、压缩机容积以及冷凝温度等因素对直膨式太阳能热泵系统热工性能的影响,并在此基础上给出了改善系统性能的建议.     

直膨式太阳能热泵集热蒸发器设计参数敏感性分析

对直膨式太阳能热泵热水系统建立数学模型,利用实验数据验证此模型的可靠性,并在此基础上,采用敏感性分析法分析集热蒸发器设计参数对系统性能的影响,同时引入敏感性系数作为评价指标,确定集热蒸发器的关键设计参数.研究显示:集热蒸发器面积对制热性能系数与热水加热功率的影响最显著,对它们的敏感性系数分别为0.201和0.223.最...     

真空管直膨式太阳能热泵系统性能分析

该文将真空管集热器与直膨式太阳能热泵结合,提出一种真空管直膨式太阳能热泵系统。实验研究典型工况下太阳辐照度、循环水温度对系统性能的影响,并探讨压缩机变频条件下系统的动态性能。结果表明,提高太阳辐照度、降低循环水温度有利于提高系统性能,在太阳辐照度为850 W/m2,循环水温度为55℃时系统取得最大COP,为5.36。压缩机频率为42 Hz的系统COP为4.08,较45、47、50 Hz分别提高1.23%、8.5%、13.6%。     

太阳能-空气源热泵热水系统新型组合优化设计

太阳能-空气源热泵热水系统(solar-air source heat pump hot water system, SAHWS)常用于宿舍楼宇供暖,通过对系统参数的优化设计可显著提高系统能效性能与环境友好性。为得到一种综合考虑SAHWS经济、能源、环保与节能的优化方法,提出了一种新型组合优化设计策略,并利用TRNSYS软件搭建系统仿真模型,以西安、西宁、拉萨这3座不同太阳能资源等级城市为例,对SAHWS运行工况对比分析。结果表明：与常用生命周期成本设计相比,所提出的组合优化设计不仅降低了系统成本,还有着较低的系统能耗;组合优化设计的热泵能耗与工作小时数最短,且有最低的热损,在投资成本、系统季节性能因子、太阳能保证率以及碳粉尘、二氧化碳排放量均有较好表现。     

太阳能热泵热水系统的研究及应用

介绍了太阳能热泵热水系统的工作原理、分类和技术特点;总结了国内外太阳能热泵热水系统的技术现状;指出了我国利用太阳能热泵热水技术的有利条件。     

奥运村开建太阳能热水系统

2008年，北京将首次在奥运村里大规模使用全世界最先进的太阳能热水系统，该系统可以满足赛时1.2万名运动员洗澡等生活用水要求。     

太阳能-热泵中央热水系统

在太阳能作为主要热源的中央热水系统中，为满足热水不间断供应，使太阳能集热系统的投资更加经济，通常采用电加热器或电锅炉、燃煤或燃油（气）锅炉、市政热力等作为太阳能中央热水系统的辅助热源。     

新型太阳能光伏-环路热管/热泵热水系统

以太阳能、环路热管与热泵技术为基础,研究一种新型太阳能光伏-环路热管/热泵热水(PV-LHP/HPWH)系统用以制取生活热水。通过数学建模模拟和室外实验验证相结合的方法,分析3种运行模式下系统典型工况及长期运行性能,并对主要结构及运行参数的影响进行分析。分析结果显示,系统的太阳能光热利用效率与传统PV/T热水系统可比,年均太阳能供热百分比为50.9%,日均供电比例为13.7%。与传统电加热方式相比,该系统节能率达71.3%。     

太阳能辅助二氧化碳热泵热水系统实验研究

利用实验的方法,研究了太阳辐照度、外界气温和风速、初始水温、蒸发器出口温度和压力等对太阳能辅助二氧化碳热泵热水系统运行状况和COP的影响。实验结果表明,系统COP随初始水温的升高而增大;太阳辐照度、外界温度和风速对热泵系统性能的影响主要体现在对系统循环水温的影响;在一定范围内,蒸发压力和蒸发温度越高,热泵系统的COP越大。     

Experimental study of photovoltaic solar assisted heat pump system

A novel photovoltaic solar assisted heat pump (PV-SAHP) system has been proposed in this study. Performance tests with a range of condenser supply water temperature were conducted on an experimental rig. The dynamic performance of this PV-SAHP system in a 4-day period with very similar weather conditions was analyzed and the influencing factors were identified. The results indicate that this PV-SAHP system has a superior coefficient of performance (COP) than the conventional heat pump system and at the same time, the photovoltaic efficiency is also higher. The COP of the heat pump was able to reach 10.4 and the average value was about 5.4. The average photovoltaic efficiency was around 13.4%. The highest overall coefficient of performance (COP_p/t), bringing into consideration both the photovoltaic and thermal efficiency, was about 16.1.     

双冷凝器热泵机组制备生活热水的试验研究

设计了一种双冷凝器结构的小型热泵机组,在给室内供暖或空调的同时,提供生活热水,实现了机组的余热利用.试验结果表明,虽然启动热水系统会降低制热效率,但其降幅仍在允许范围之内,COP仍然保持在3.0以上,完全可以实现一机三用.     

以空气源热泵辅助加热的太阳能热水系统

介绍了太阳能热泵热水系统的运行原理及控制方式,分析了太阳能热泵热水系统在上海某高校学生宿舍的应用情况。以每吨热水的加热成本为指标,对几种热源热水系统的经济性进行了比较,分析了太阳能热泵热水系统的节能效果。     

Study on performance of solar assisted air source heat pump systems for hot water production in Hong Kong

This paper reports the investigation results on application of the solar assisted air source heat pump systems for hot water production in Hong Kong. A mathematical model of the system is developed to predict its operating performance under specified weather conditions. The optimum flow rate from the load water tank to the condenser is proposed considering both the appropriate outlet water temperature and system performance. The effect of various parameters, including circulation flow rate, solar collector area, tilt angle of solar collector array and initial water temperature in the preheating solar tank is investigated, and the results show that the system performance is governed strongly by the change of circulation flow rate, solar collector area and initial water temperature in the preheating solar tank.     

基于多参数空气源热泵辅助太阳能热水机组的控制系统

采用了空气源热泵辅助的太阳能热水机组,以解决单一太阳能热水系统受天气条件影响的问题。以PLC控制器为核心,综合考虑光照条件、环境温度、水箱水温、供水压力等多个参数条件,设计了基于多参数的空气源热泵辅助太阳能热水机组的自动控制系统,实现了以太阳能为主热源的热水机组全天候稳定热水供应,有效地节约了能源。     

Numerical simulation of solar assisted ground-source heat pump heating system with latent heat energy storage in severely cold area

Solar assisted ground-source heat pump (SAGSHP) heating system with latent heat energy storage tank (LHEST) is investigated. The mathematical model of the system is developed, and the transient numerical simulation is carried out in terms of this model. The operation characteristic of the heating system is analyzed during the heating period in Harbin (N45.75°, E126.77°). From the results of the simulation, the average coefficient of performance (COP) of the heating system is 3.28 in heating period. In the initial and latter heating period, the COP of the heating system is higher, and the highest value is 5.95, because the system can be operated without heat pump. During the middle heating period the COP of the heating system and the operation stability of the system are improved due to solar energy and soil alternately or together as the heat source of heat pump. LHEST is a very important role in operation of the system. The system can be operated more flexibly, effectively, and stably by the charge and discharge heat of LHEST, and the effect becomes especially obvious in the initial and latter heating period.     

Experimental results of a solar assisted heat pump rice drying system

In the last rice harvest season, experimental results have been obtained on the efficiency and drying quality of a solar assisted heat pump drying prototype system. The system has been operated as a solar and heat pump system and drying curves for the different options have been obtained. The advantage of the low temperature and better control in the drier shows that the heat pump assisted solar drying system is an excellent alternative to traditional drying systems.     

地源热泵复合系统热水机组实验研究

通过实验系统模拟复合系统中制热水机组的各个特定工况,分别进行静态实验测试,分析机组的性能和输入功率在三种不同工况下的变化情况,指出复合系统中制热水机组具有很高的节能效果。     

Experimental and theoretical study on a solar assisted CO2 heat pump for space heating

In this paper, a solar combi-system which consists of solar collector and a CO₂ heat pump is investigated experimentally and theoretically. Two experiments are primarily conducted to show the performance of this solar combi-system under different operation conditions. A system model is developed and validated in TRNSYS to analyze the influence of main components parameters. Subsequently, a multi-parameter optimization is carried out in GENOPT to obtain a final optimal result. The simulated results show that the optimized system can save 14.2% electricity and improve the solar fraction by 8%. The solar fraction of the optimized system can reach 71.1%. Finally, the optimized system performance is studied with the weather and load characteristics in Shanghai. Compared with the CO₂ HP heating system alone, the solar assisted system can save 1790.8 kWh electricity on the basis of year round operation.