地埋管地源热泵热水供应系统运行性能的影响因素

建立了地埋管地源热泵热水供应系统实验平台,研究了环境温度、间歇/连续运行工况、管内循环液流速等对地埋管换热器换热能力的影响,并研究了地埋管换热器周围土壤温度场的变化.结果表明,地埋管地源热泵热水供应系统基本不受环境温度的影响;采用间歇运行,有利于提高地埋管换热器的换热能力;地埋管换热器平均单位井深换热量随管内循环液流速的增大而增大,但当流速增大到一定程度时,其增幅趋于平缓.     

Experimental study of a solar-assisted ground-coupled heat pump system with solar seasonal thermal storage in severe cold areas

This paper presents the experimental study of a solar-assisted ground-coupled heat pump system (SAGCHPS) with solar seasonal thermal storage installed in a detached house in Harbin. The solar seasonal thermal storage was conducted throughout the non-heating seasons. In summer, the soil was used as the heat sink to cool the building directly. In winter, the solar energy was used as a priority, and the building was heated by a ground-coupled heat pump (GCHP) and solar collectors alternately. The results show that the system can meet the heating-cooling energy needs of the building. In the heating mode, the heat directly supplied by solar collectors accounted for 49.7% of the total heating output, and the average coefficient of performance (COP) of the heat pump and the system were 4.29 and 6.55, respectively. In the cooling mode, the COP of the system reached 21.35, as the heat pump was not necessary to be started. After a year of operation, the heat extracted from the soil by the heat pump accounted for 75.5% of the heat stored by solar seasonal thermal storage. The excess heat raised the soil temperature to a higher level, which was favorable for increasing the COP of the heat pump.     

土壤源热泵系统设计方法

介绍了土壤源热泵系统的设计方法和步骤,结合计算实例重点论述了地下换热器的设计过程,包括换热器形式及管材选择,管径、管长的确定,管道阻力计算等。     

浅谈地源热泵空调系统

介绍了地源热泵技术的概念及工作原理，对地下水热泵系统、地表水热系统等三种地源热泵空调的应用方式作了阐述，经与传统的中央空调作比较，提出了国内外地源热泵的发展前景。     

用于供暖的土壤－水热泵系统

本文介绍了无污染、低品位的土壤热源热泵实现冬季供暖的技术，提供了土壤热交换器的设计参数和室内供暖的匹配方法，并指出，与空气热源热泵的全年电费相比较，土壤热源热泵节电１０％～１２％。     

地源热泵地下管群换热器设计施工技术点滴

介绍了地源热泵地下管群换热器的常用型式，对8kW地源热泵系统的地下管群换热器的设计、施工方法、系统的初投资和运行情况进行了详细分析和讨论。     

地源热泵系统地下埋管换热器设计(2)

讨论了地下埋管系统环路方式、埋管材料、埋管间距、埋管内工作流体的确定以及地下岩土热平衡的维持等问题。     

U型垂直换热器地源热泵夏季供冷测试及传热模型

介绍了重庆地区某U型垂直换热器地源热泵实验系统在夏季的供冷情况，提出了对地源热泵系统运行的改进方案，并给出了地下U型垂直换热器的传热模型。     

地源热泵设计中两个重要参数的实验研究

在地源热泵系统设计时,地埋管换热器进口水温和管内流速对换热量有着非常重要的影响.热响应实验以单口地埋井为实验对象,通过改变换热器内介质的流速及进口温度,得到了单位管长换热量,为地埋井深度的设计提供参考.     

地源热泵系统竖直U形管换热器设计中的问题探讨

介绍了地源热泵系统竖直U形管换热器的设计理论。分析了U形管管径、单孔内U形管数量及热泵机组设计进水温度对换热器换热效果的影响。     

地源热泵系统地下埋管换热器设计(1)

分析讨论了地下埋管换热器设计中岩土热物性参数的确定,垂直竖井的回填材料、岩土冻结对埋管换热器的影响,埋管形式及埋管深度的选择。     

Simulation of hybrid ground-coupled heat pump with domestic hot water heating systems using HVACSIM+

A hybrid ground-coupled heat pump (HGCHP) with domestic hot water (DHW) supply system has been proposed in this paper for space cooling/heating and DHW supply for residential buildings in hot-climate areas. A simulation model for this hybrid system is established within the HVACSIM+ environment. A sample system, applied for a small residential apartment located in Hong Kong, is hourly simulated in a typical meteorological year. The conventional GCHP system and an electric heater for DHW supply are also modeled and simulated on an hourly basis within the HVACSIM+ for comparison purpose. The results obtained from this case study show that the HGCHP system can effectively alleviate the imbalanced loads of the ground heat exchanger (GHE) and can offer almost 95% DHW demand. The energy saving for DHW heating is about 70% compared with an electric heater. This proposed scheme, i.e. the HGCHP with DHW supply, is suitable to residential buildings in hot-climate areas, such as in Hong Kong.     

串联式复合地源热泵系统技术经济性分析

以湖南省株洲市一商业建筑为研究对象,利用EnergyPlus能耗模拟软件模拟了其全年负荷.在此基础上对冷却塔与地埋管换热器分别承担不同比例冷负荷时系统的初投资、运行费用、多年运行总费用和全寿命周期成本等进行了计算分析.结果表明,复合式地源热泵系统如果配置不当,不但不会提高系统的经济性,反而会适得其反.     

地源热泵夏季性能测试及传热模型

对50m深埋地下换热器地源热泵系统夏季间歇运行时的制冷性能进行了测试,分析了系统运行对地温的影响,提出采用混合系统来解决重庆地区冬夏季土壤中吸热、放热不平衡的问题,引入圆柱源理论建立了垂直U型管传热模型,模拟结果与实验结果吻合较好。     

关于发展地源热泵系统的若干思考

就地源热泵系统的原理、分类,水源热泵机组与地源热泵系统的区别,地下水水源热泵系统的环境风险,地耦合水源热泵系统的数学模型与计算程序,地表水水源热泵系统选用条件,水源热泵机组的其他应用等方面,提出了作者认为值得思考的若干问题与意见,希望引起同行们讨论。     

地源热泵地下换热器施工工艺

结合地源热泵的工作原理,从钻孔、下管、灌浆封井、换热器安装及管道连接方面介绍了地源热泵地下换热器的操作方法,并总结归纳了操作的要点及难点,从而为地源热泵换热器系统节能工程的施工积累经验。     

地源热泵及垂直埋管法技术

论述了地源热泵的基本理论、工作原理、特点和类型，从垂直式热交换器的构造、影响因素和安装步骤方面介绍了土壤热交换器地源热的垂直埋管法，以使地源热泵更广泛地应用。     

地源热泵系统施工技术概述

介绍了竖直埋管地热换热器施工技术,特别是对地热换热器的钻孔、下管和回填的技术要点和设备等进行了详细的阐述。     

我国寒冷地区利用热泵技术供应生活热水的经济性分析

本文以我国典型冬季寒冷地区——北京为例。对土壤源热泵、水源热泵和空气源热泵技术供应生活热水的经济性进行了详细分析。结果发现．空气源热泵与其他两种热泵相比经济性优势明显。