【作者】 王子红；

【导师】 郭亮亮； 张华；

【作者基本信息】 太原理工大学 ， 水利工程（专业学位）， 2022， 硕士

【摘要】 地热能作为一种清洁、可再生能源,近年来逐渐受到人们的关注。地源热泵技术作为一种开发浅层地热能的技术,逐步被运用到建筑领域。但在寒冷地区,地源热泵技术导致的土壤冷堆积问题始终没有得到很好的解决。为解决上述问题,本文提出了太阳能与地源热泵系统联合运用的解决思路,并对此进行了相关研究。本文利用Transient System Simulation Program(TRNSYS)软件,对太原地区独立居民建筑进行了建筑负荷计算。在此基础之上,结合工程规范,对太阳能-地源热泵耦合系统进行了初步设计,并对相关设备进行了选型。之后,利用TRNSYS软件对独立地源热泵系统进行建模,并研究了土壤、地埋管以及热泵机组相关参数的运行变化规律。同时,还研究了地源侧设计参数对土壤冷堆积的影响。在此基础之上,进行了独立地源热泵系统的优化设计。另外,依据太阳能-地源热泵耦合系统基本原理,提出了两种太阳能-地源热泵耦合系统运行模式:辅助加热模式和联合供暖模式。并对两种运行模式的控制策略进行了设计。同时,运用TRNSYS软件构建了耦合系统的数值模型。在模型的基础之上,分别研究两种运行模式下土壤、地埋管以及热泵机组相关参数的运行变化规律,并对这两种运行模式能否降低土壤冷堆积进行评价。此外,对辅助加热模式进行了重点研究。研究了辅助加热模式下太阳能集热器循环部分相关设计参数对土壤冷堆积的影响,并对辅助加热运行模式的系统设计进行了优化。最后,利用费用年值法对太阳能-地源热泵耦合系统经济性进行分析,并给出了耦合系统的环境效益评价。主要研究成果如下:(1)太原市独立居民建筑供暖季累计热负荷远大于制冷季累计冷负荷。因此,仅地源热泵系统对该建筑进行全年的供暖制冷时,土壤必然会出现冷堆积。(2)太阳能-地源热泵耦合系统的两种运行模式均能降低土壤冷堆积程度。其中,辅助加热模式,能够实现系统运行10年,土壤平均温度仅下降0.2℃;联合供暖模式虽能够减少土壤冷堆积,但蓄热水箱供水后,较高的回水温度会影响热泵机组正常运行。因此,应注重考虑联合供暖时的管路设计。(3)当进行耦合系统优化设计时,应着重优化地埋管间距、地埋管设计流量、蓄热水箱供水温度以及太阳能集热器面积等设计参数。(4)经济性方面,太阳能-地源热泵耦合系统的费用年值略高于市政管网供暖+空调制冷的费用年值,二者差别不大,但该耦合系统环境效益突出。综上所述,太阳能-地源热泵耦合系统在寒冷地区能够解决土壤冷堆积问题。对于无法进行市政管网供暖、且有生活热水需求的农村独立居民建筑,使用太阳能-地源热泵耦合系统供暖制冷属于较优选择。本文的结论对太阳能-地源热泵耦合系统在实际工程中的应用具有一定参考价值。更多还原

【Abstract】 As a kind of clean and renewable energy,geothermal energy has received more and more attention in recent years.As a technology to develop shallow geothermal energy,ground source heat pump technology has been gradually applied to the field of construction.However,in cold regions,the problem of soil cold accumulation caused by ground source heat pump technology has not been well solved.In order to solve the above problem,this paper proposes a solution for the combined application of solar energy and ground source heat pump systems,and conducts related research on this.In this paper,the building load calculation of independent residential buildings in Taiyuan area is carried out by Transient System Simulation Program(TRNSYS)software.On this basis,combined with the engineering specifications,the solar-ground source heat pump coupling system is preliminarily designed,and the equipment is selected.After that,the independent ground source heat pump system is modeled by using TRNSYS software,and the operation variation law of soil,buried pipes and related variables of heat pump unit is studied.At the same time,the influence of the design parameters of the ground source side on the soil cold accumulation is also studied.On this basis,the optimal design of the independent ground source heat pump system is carried out.In addition,according to the principle of the solar-ground source heat pump coupling system,two operating modes of the solar-ground source heat pump coupling system are proposed: auxiliary heating mode and combined heating mode.The control strategies of the two operating modes are designed.At the same time,the numerical model of the coupled system is constructed by using TRNSYS software.On the basis of the model,the variation laws of soil,buried pipes and related variables of the heat pump unit under the two operating modes are respectively studied,and whether the two operating modes can reduce the cold accumulation of soil is evaluated.In addition,the auxiliary heating mode is mainly studied.The influence of the relevant design parameters of the solar collector cycle part on the soil cold accumulation in the auxiliary heating mode is studied,and the system design of the auxiliary heating operation mode is optimized.Finally,the economics of the solar-ground source heat pump coupling system is analyzed by using the annual cost method,and the environmental benefit evaluation of the coupling system is given.The main research results are as follows.(1)The results show that the cumulative heat load of independent residential buildings in Taiyuan in the heating season is much greater than the cumulative cooling load in the cooling season.When an independent ground source heat pump system heats and cools the building year-round,cold accumulation in the soil is bound to occur.(2)Both operating modes of the solar-ground source heat pump coupling system can reduce the degree of soil cold accumulation.Among them,the auxiliary heating mode operation mode can realize the system operation for 10 years,and the average soil temperature drops by only 0.2 °C;although the combined heating mode can reduce the cold accumulation of soil,the high return water after the water supply from the hot water storage tank will affect the normal operation of the heat pump unit.Therefore,attention should be paid to the piping design for combined heating.(3)When optimizing the coupling system,it should focus on optimizing the design parameters such as the distance between the buried pipes,the design flow rate of the buried pipes,the water supply temperature of the hot water storage tank,and the area of the solar collector.(4)In terms of economy,the annual cost of the solar-ground source heat pump coupling system is slightly higher than the annual cost of the municipal pipe network heating + airconditioning cooling,but the difference between the two is not significant.However,the environmental benefits of the coupling system are outstandingTo sum up,the solar-ground source heat pump coupling system can solve the problem of soil cold accumulation in cold regions.For independent residential buildings in rural areas that cannot be heated by municipal pipe network and have domestic hot water demand,the use of solar-ground source heat pump coupling system for heating and cooling is a better choice.The conclusion of this paper has certain reference value for the application of the solar-ground source heat pump coupling system in practical engineering.更多还原