土壤蓄冷与土壤耦合热泵集成系统的模拟研究

结合土壤耦合热泵技术和土壤蓄冷技术的优点,提出了一种全新的热泵空调系统形式——土壤蓄冷与土壤耦合热泵集成系统,建立了夏季空调工况时土壤蓄冷、释冷过程的数学模型,采用固相增量法模型对系统的蓄冷、释冷运行特性进行了模拟计算,为土壤蓄冷与土壤耦合热泵集成系统的应用提供了理论支持。     

土壤蓄冷与土壤耦合热泵集成系统全年连续运行特性分析

针对上海地区的一栋办公楼,按照适用于土壤蓄冷与土壤耦合热泵集成系统的运行方式,对该系统的全年运行特性进行了模拟计算分析。结果表明,该集成系统采用的运行方式不仅有效地降低了白天高峰时段空调的用电量,而且还缓解了冬夏负荷不平衡导致的土壤温度逐年变化问题。     

夏热冬冷地区冷却塔—土壤耦合热泵过渡季蓄冷特性研究

本文针对夏热冬冷地区冷热负荷特性,提出了冷却塔—土壤耦合热泵过渡季土壤蓄冷模式,采用软件TRNSYS建立了冷却塔—土壤耦合热泵过渡季土壤蓄冷系统仿真模型,并利用该模型针对过渡季土壤蓄冷的两个主要影响因素进行了工况模拟分析,,在此基础上提出了冷却塔—土壤耦合热泵过渡季节土壤蓄冷的控制策略.本文力图通过上述研究探索出缓解夏热冬冷地区土壤源热泵系统全年热失衡问题、提高该系统运行效率的有效途径.     

一种土壤蓄冷与双级热泵集成系统

结合蓄冷技术和土壤源热泵技术,提出了一种土壤蓄冷和双级热泵集成系统,该系统主要由双工况制冷机组和水源热泵机组构成。介绍了该集成系统制冷、蓄冷和供热的工作过程,并指出有待解决的问题。     

土壤蓄冷与土壤耦合热泵集成系统中土壤蓄冷与释冷过程的特性研究

通过建立土壤蓄冷、释冷的数学模型，对土壤蓄冷与土壤耦合热泵集成系统进行了数值模拟。分析了盘管管材、土壤类型、蓄冷温度、流体的流量、盘管间距以及土壤含水率等因素对管束内层盘管运行特性的影响。     

氨水蓄能土壤源热泵集成系统工作过程的模拟研究

提出了以浅层土壤为热源/汇的氨水蓄能热泵集成系统,建立了系统工作过程动态数学模型。以长江流域某一办公建筑为例,对该系统夏季空调工况和冬季供暖工况进行了数值模拟。与以空气为热源/汇的氨水蓄能热泵集成系统进行了比较,结果显示以土壤为热源/汇的系统工作性能优于以空气为热源/汇的系统。     

太阳能-地源热泵与地板辐射空调系统联合运行方式探讨

论述了太阳能及地热能作为地板辐射空调系统冷热源的可行性及必要性,提出了一种利用太阳能和土壤热源热泵通过地板辐射空调供暖供冷的方案,讨论了系统在冬夏和过渡季的运行方式。     

土壤季节性蓄存自然冷量的实验研究

介绍了-种利用土壤蓄存自然冷量的方法,建立了深层土壤长期蓄冷实验系统,研究了季节性蓄冷过程中土壤蓄冷效率和土壤温度场的变化,探讨了提高蓄冷效率的运行模式.     

蓄冷装置在天然气热电冷联供系统中的应用

在区域供冷系统中，利用蓄冷装置，可以在夏季空调供冷期参与电网电力调峰。即在满足空调负荷的前提下，在电力高峰期增大发电量，在电力低谷期减少发电量或者增加用电量。另外，利用蓄冷装置，可以大幅度降低空调制冷机组装机容量，提高区域供冷系统运行稳定性，从而提高机组运行效率。本文结合清华大学区域供冷工程实例，对采用蓄冷装置的区域供冷系统进行运行模拟分析，从而对上述结论进行了论证。     

自然冷源季节性土壤蓄冷取冷工况分析

建立了自然冷源季节性土壤蓄冷实验系统,对取冷前工况和夏季取冷工况进行了分析,研究了夏季取冷量、取冷时地埋管换热器进出口温度和土壤温度场的变化规律.该实验系统的 COP 为 4.78.     

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.     

Long term operation of a solar assisted ground coupled heat pump system for space heating and domestic hot water

This paper introduces a solar-assisted ground-coupled heat pump (SAGCHP) system with heat storage for space heating and domestic hot water (DHW) supply. The simulation results of the system's detailed operating performance are presented. The optimization of the system design is carried out by the TRNSYS and a numerical simulation is performed for continuous operation of 20 years under the meteorological conditions of Beijing. Different control strategies are considered and the operational characteristics of each working mode are studied. The simulating results show that the long term yearly average space heating efficiency is improved by 26.3% compared to a traditional ground coupled heat pump (GCHP) system because the solar thermal collecting system is used to elevate the thermal energy in the soil and to provide direct space heating with heat storage. At the same time, the underground heat load imbalance problem for a heating load dominated GCHP is solved by soil recharging during non-heating periods, while extra solar energy is utilized to supply DHW. The flexibility and high efficiency of the SAGCHP system could offer an alternative for space heating and DHW supply by heat pump technology and solar energy in cold winters of northern China.     

冷却塔式复合地源热泵系统控制方法探讨

在夏热冬冷地区,传统式单独运行的地埋管式地源热泵在夏季对土壤的蓄热量大于在冬季的取热量,常年运行会造成土壤热失衡及热泵机组运行效率降低的情况。冷却塔式复合地源热泵系统可利用冷却塔辅助散热,通过分析其组成结构、工作原理和分类特点,确认控制温差和调节冷却塔运行时间等方法可改善热泵运行的工作效率,保持地埋管附近土壤的热平衡,同时在降低热泵机组初投资、运行维护费用,以及减少占地面积等方面优势明显。     

混合土壤热泵在长江流域的应用前景

混合土壤热泵包括埋地换热器和冷却塔两部分，埋地换热器用于供热，而冷却塔和埋地换热器共同制冷。从理论上来说，山于冷却塔承担了一部分冷负荷，从而减少了埋地换热器的数量，节省了初投资。本文首先介绍了混合土壤热泵的工作原理及其特点，然后比较了混合土壤热泵与水源热泵的初投资，并分析了其运行费用，得出当系统容量小丁616kW时，混合土壤热泵在经济上和技术上具有明显优势的结论。在此基础上，从地理环境、气候条件及技术优势和环保的角度讨论了混合土壤热泵在长江流域及其周围地区的发展优势，展望了混合土壤热泵在该地区的发展前景。     

某体育场地源热泵系统设计及运行策略分析

介绍了该工程地源热泵系统设计。从冷热周期内地源热泵系统热量平衡的角度,分析了地源热泵系统的运行策略。     

地下水源热泵运行模式对地温场效能影响研究

基于上海市某地下水源热泵工程项目,采用COMSOL Multiphysics有限元分析工具建立二维简化的热渗耦合数值模型,模拟采能区含水层多孔介质热量运移过程,并利用热泵运行3年的现场监测数据进行模型的识别与验证。探讨热泵系统冷、热负荷设计和抽、灌模式两个方面对采能区地温场效能的影响,分析和预测不同工况下热泵运行期间地温场的演变特征,最后对系统的运行效果进行评价。结果表明:该热泵系统按原设计方案运行时,抽灌井短期运行效果良好,但在第7个供暖期末将出现热贯通现象,长期运行将不利于热井的取热; 如果减小20%热负荷、增加20%冷负荷,会使冷影响区扩散速度降低46.3%,系统运行效果得到显著改善,在模拟的9个运行周期内并未出现热贯通现象,说明合理调节冷、热负荷有利于热泵系统的长期稳定运行; 当冷、热负荷恒定时,分别减小10%和20%的循环水量将会使冷影响区扩散速度分别降低9.3%和15.7%,有效地缓解了热贯通的发生,且仍能满足项目对于制冷供暖的需求,进一步阐明了地下水源热泵系统宜采用“大温差、小流量”的抽灌模式。     

A raw water source heat pump air-conditioning system

Raw water source is one of the promising new heat sources that researchers are looking into along with various others water-based sources such as ground, lake, river and sewage water. Generally, the water that is taken from the environment and supplied to a water treatment facility is called raw water. In this study, the heating and cooling performance of a heat pump utilizing the heat energy of raw water supplied to a water treatment facility is investigated. The two heat pumps being investigated have a heating capacity of 65.2 kW and were installed at the site for the heating and cooling of the central control room. A brazed plate heat exchanger was used for obtaining heat energy from the raw water. The raw water source provides a favorable heat source compared to the ambient air source except in spring. In the seasons of spring and autumn, the heating and cooling load are extremely low, this is the main reason for the poor performance of the raw-water heat pump system for those seasons. The average unit COP during the heating season is 3.3, and the average unit COP for the cooling season is 7.2.     

不同地区土壤温度及建筑负荷特性对地源热泵系统的影响

本文以我国不同地区的地源热泵为研究对象,首先对地埋管系统建立了CFD模型,根据各地区的土壤初始温度和热物性进行模拟计算,讨论了几种工况下土壤换热能力及地埋管进、出口温差的变化。而后对某办公建筑匹配不同地区的围护结构参数,利用DeST软件进行模拟计算,得出了各典型城市建筑负荷特性,进一步分析了建筑负荷对地源热泵系统的影响。分析可知无论是从热泵机组效率角度考虑,还是从土壤热平衡角度考虑,低纬度地区均不宜单独使用地源热泵系统进行空调和采暖,应考虑采用辅助冷热源,构建复合型采暖空调系统。