SGCHPS土壤蓄热供热供冷效果分析

为减少建筑供热供冷能耗,实现严寒地区太阳能-土壤源热泵系统（SGCHPS）对建筑进行长期稳定的供热供冷,提出依靠季节性太阳能土壤蓄热来维持土壤热平衡、提高系统效率的方法.以严寒地区太阳能-土壤源热泵供热供冷示范工程为平台,根据建筑负荷确定系统配置,并选定4种模式交替运行,进行了3年的长期实验.实验结果表明：季节性蓄热S...     

严寒地区土壤源热泵系统热平衡问题分析

本文分析了土壤源热泵系统在严寒地区应用中所出现的热平衡问题,严寒地区系统从土壤中取/排热量差异很大,从而导致热平衡问题的出现,同时提出适用于严寒地区土壤热平衡问题的解决方案.     

太阳能-土壤源热泵系统仿真建模及运行研究

基于太阳能-土壤源热泵系统各部件之间的耦合关系,建立了太阳能-土壤源热泵系统中热泵机组、地下埋管换热器、太阳能集热器及蓄热水箱等各组成部分的仿真模型,对某一实际工程应用DeST软件计算建筑物负荷,并建立了太阳能-土壤源热泵系统的模型,分析研究了该系统在动态和静态两种运行模式下的性能特征,并得出两种运行状态下系统平均制热性能系数COPh值分别达到3.5和2.98.     

太阳能-土壤源热泵供热系统在张家口地区的应用

张家口作为可再生能源示范区,为保证良好的空气质量,适应当前形势,使用可再生或清洁能源供热是必要的.本文介绍了张家口某收费站燃煤锅炉改太阳能-土壤源热泵工程,并对太阳能-土壤源热泵供热系统的运行情况进行了分析,总结出系统运行中存在的问题并给出相应的建议.为张家口地区太阳能-土壤源热泵供热系统的应用及推广提供一定的参考.     

太阳能辅助加热土壤源热泵系统理论分析

土壤源热泵在冬季运行一段时间之后,存在工作温度降低的工况。为提高土壤源热泵的性能,在负荷匹配的情况下增加其经济性,本文提出了一种太阳能辅助加热方法。通过冬季供暖工况的理论分析得到供热系数与埋管进出口温度、空调供热负荷的关系。得出在增设太阳能辅助系统之后热泵供热系数能有较大提高的结论。     

潜热蓄热对太阳能-土壤源热泵系统影响

为提高太阳能-土壤源热泵系统在整个供暖期性能系数,提出带有潜热蓄热装置的太阳能-土壤源热泵供暖系统,并对该系统在哈尔滨地区的运行特性进行动态数值模拟,分析潜热蓄热装置对系统在整个供暖期运行性能的影响.由模拟分析可知,相变蓄热装置在系统的运行中起到重要的作用,使整个系统的运行更加灵活、高效、稳定.系统在整个供暖季的平均供暖性能系数为3.82,在供暖季的前期和末期,系统的日平均供暖性能系数较高,最高可达12.89.     

太阳能辅助加热土壤源热泵系统理论分析

土壤源热泵在冬季运行一段时间之后，存在工作温度降低的工况。为提高土壤源热泵的性能，在负荷匹配的情况下增加其经济性，本文提出了一种太阳能辅助加热方法。通过冬季供暖工况的理论分析得到供热系数与埋管进出口温度、空调供热负荷的关系。得出在增设太阳能辅助系统之后热泵供热系数能有较大提高的结论。     

严寒地区高速公路建筑空气-土壤源热泵系统节能性运行策略研究

针对严寒地区地源热泵系统供暖出现土壤热不平衡问题,研究提出使用空气-土壤复合式地源热泵系统,以期减小土壤热不平衡性.文中基于TRNSYS软件对某高速公路服务区建筑空气-土壤源热泵系统节能性开展案例研究,通过对建筑全年逐时负荷的动态仿真模拟和分析,从节能性角度对比空气-土壤源热泵系统在6种负荷分担比例运行策略下的能效差异...     

寒冷地区太阳能-地源热泵耦合机组性能比较

针对夏季冷负荷远远大于冬季热负荷的冀西北寒冷地区冬季对供暖质量要求高、时间长的特点,以某办公楼供暖系统改造工程为例介绍了地源热泵系统的优化方案,分析了寒冷地区建筑物供暖应用地源热泵技术的必要性和可行性,研究了太阳能-地源热泵耦合式供暖模式的节能效果,提出了寒冷地区建筑物新型节能环保供热方式的发展方向。     

太阳能-土壤源热泵系统在唐山地区适用性研究

简述了太阳能-土壤源热泵系统的研究现状,介绍了太阳能-土壤源热泵系统形式,采用Dest软件对唐山地区的太阳能辐射量情况进行了分析,并对典型建筑的负荷特性进行了模拟分析,论述了太阳能-土壤源热泵系统在唐山地区的适用性。     

太阳能与地埋管热泵联合采暖实验

为了考察太阳能光热系统的蓄热能力,以及太阳能地埋管热泵联合采暖空调是否满足建筑物能量供给,针对一栋220 m²的建筑物,建立了一套太阳能地埋管热泵联合采暖空调系统.以冬季采暖负荷作为建筑物的能量需求,在此基础上配置太阳能和地埋管系统.实验结果表明:通过太阳能光热跨季节采暖蓄热,可以使土壤温度提高3℃,制热机组能力提高8%,太阳能光热和地埋管热泵系统联合采暖切实可行.     

联供模式地下换热器温变及其热泵效能分析

在地下换热器G函数理论基础上,建立了地源热泵热力过程计算模型。研究了地下换热器和热泵运行的基本性能,及其单供和联供的主要差异。通过计算孔井壁面温度及地下换热器进、出口流体温度,对热泵能效比、能耗等热力参数进行了对比分析。以严寒地区和夏热冬冷地区为例,结合冷热负荷需求,研究了冷热单供与联供方式对地下换热器温变和热泵效能的影响作用。     

太阳能—地源热泵系统耦合运行方式研究进展

介绍了太阳能—地源热泵联合运行系统（solar—ground source heat pump system）,一种新型节能、环保的供暖（供冷）系统,并分别对不同的太阳能系统和地源热泵系统连接方式进行优缺点的分析,并具体给出了几种两个系统的联合运行方式.     

Numerical simulation and experimental verification of solar seasonal soil thermal storage

To analyze the characteristics of solar seasonal soil thermal storage in a solar-ground coupled heat pump system (SGCHPS) in severe cold area,the software FLUENT was used to establish the three-dimensional unsteady state fluid-solid coupling mathematical model of multi-well ground heat exchanger (MWGHE).The User-Defined Functions (UDF) of solar collector and plate heat exchanger were written and dynamically loaded into the model of MWGHE as the boundary conditions.In this way,the dynamic simulation of solar seasonal soil thermal storage was realized.The comparison of simulative and experimental results showed that the overall variation trend of simulative and experimental values achieves a good agreement with time;the relative errors of simulated parameters are all in the allowable range.Therefore,it can be obtained that the models established can be applied in the investigation of performance of solar seasonal soil thermal storage.At the same time,it provides a theoretical basis for the study of heating in SGCHPS and soil heat balance analysis after long-time thermal storage and extraction.     

Heat balance of solar-soil source heat pump compound system

Based on the state-of-the-art studies of solar-soil source heat pump compound system, operation patterns of solar-soil compound system were analyzed, particularly the advantages of parallel operation pattern. It is found that parallel operation pattern is better for solar-soil compound system. Furthermore, the heat balance issue of solar-soil compound system was emphatically analyzed from four aspects, which were annual analysis of heating and cooling load, the heat exchange of ground heat exchanger, capacity determination of solar-assisted heat source and heat balance calculation of solar-soil compound system. Moreover, annual rate of heat balance in a solar-soil source heat pump compound system was calculated with a case study. It is shown that the annual heat unbalance ratio is 19%, which is less than 20%. As a result, the practical solar-soil compound system can basically maintain the heat balance of soil.     

土壤源热泵系统长期运行特性试验分析

对一个已运行了8年的3 715 m2热泵系统,进行了系统运行特性的长期测试试验。结果表明,在冷热负荷不同,不考虑土壤总的吸排热量的不平衡的情况下,会导致土壤源热泵运行不稳定。针对热负荷小于冷负荷的情况,增加冷却塔来平衡地下热堆积,并对之后土壤温度的恢复情况进行试验观察,使该土壤源热泵能够更长期稳定运行,并保持一定的节能水平。试验结果对当前土壤源热泵系统的优化设计、系统监测、标准制定具有一定的指导意义。     

效率高、环保效能好的供热制冷装置——地源热泵的开发与利用

地下浅层地能资源 (包括土壤、地下水、地表水和人类的生产生活低位能量等 )的非开采利用 ,可以通过热泵装置实现供热和制冷的双重作用。地源替代常规空气源 ,充分利用了地温逆变性 (冬暖夏凉 )和常年温变小以及蓄能的特点 ,实现了能量的再利用和良好的环保效能。使在北方冬季应用热泵供暖系统成为现实 ,并可实现供热制冷系统一体化。本文概述了国内外该领域的发展状况和该技术的可行性。     

Simulation of embedded heat exchangers of solar aided ground source heat pump system

Aimed at unbalance of soil temperature field of ground source heat pump system, solar aided energy storage system was established. In solar assisted ground-source heat pump (SAGSHP) system with soil storage, solar energy collected in three seasons was stored in the soil by vertical U type soil exchangers. The heat abstracted by the ground-source heat pump and collected by the solar collector was employed to heating. Some of the soil heat exchangers were used to store solar energy in the soil so as to be used in next winter after this heating period; and the others were used to extract cooling energy directly in the soil by circulation pump for air conditioning in summer. After that solar energy began to be stored in the soil and ended before heating period. Three dimensional dynamic numerical simulations were built for soil and soil heat exchanger through finite element method. Simulation was done in different strata month by month. Variation and restoration of soil temperature were studied. Economy and reliability of long term SAGSHP system were revealed. It can be seen that soil temperature is about 3 ℃ higher than the original one after one year’s running. It is beneficial for the system to operate for long period.