Research on the heat transfer performance of a ground heat exchanger under the synergistic effect of nanofluid and phase change material

IF 9.9 1区 工程技术 Q1 ENERGY & FUELS
Qinggong Liu , Chao Lv , Minjie Wen , Yong Wang
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引用次数: 0

Abstract

A ground-coupled heat pump (GCHP) system is an energy-efficient building service device that utilizes geothermal energy for heating or cooling buildings through ground heat exchanger (GHE). Owing to its ability to accomplish energy transfer, the GHE is a vital component of GCHP system. Therefore, efforts have been made to improve the heat transfer performance of GHE in terms of material and structure. A novel GHE design, nanofluid and shape-stabilized phase change material-assisted spiral-type GHE (NF&SSPCM-SGHE) system, was conceptualized. To investigate the heat transfer performance of this novel system, a 3D transient numerical model based on the thermal dispersion model for the solving nanofluid flow and heat transfer, as well as an effective heat capacity method for the solving phase transition heat transfer process, were established and verified against the data obtained by the prototype experimental platform. Subsequently, comparative studies between the NF&SSPCM-SGHE and U-type GHE (U-GHE) systems were conducted under summer conditions in Chengdu (China). The results demonstrated that the heat transfer performance of NF&SSPCM-SGHE system was significantly improved under the synergistic effects of the spiral-type heat exchanger, SSPCM, and nanofluid, and its single borehole cooling capacity was approximately 2.35 times that of U-GHE system. Nanofluid and SSPCM, a combination of one inside and one outside, play a separate role and promote and reinforce one another. Findings of this study are anticipated to realize the innovation and development of GCHP system and provide the innovative paths and methods for the realization of the “dual carbon” goal.
纳米流体与相变材料协同作用下的地下换热器换热性能研究
地面耦合热泵(GCHP)系统是一种利用地热能通过地面热交换器(GHE)为建筑物供暖或制冷的节能建筑服务装置。由于能够完成能量传递,GHE是GCHP系统的重要组成部分。因此,人们从材料和结构两方面努力提高GHE的传热性能。提出了一种新型的GHE设计,即纳米流体和形状稳定相变材料辅助螺旋型GHE (NF&SSPCM-SGHE)系统。为了研究该系统的传热性能,建立了求解纳米流体流动和传热的基于热分散模型的三维瞬态数值模型,以及求解相变传热过程的有效热容方法,并与原型实验平台获得的数据进行了验证。随后,在中国成都夏季条件下对NF&;SSPCM-SGHE和u型GHE (U-GHE)系统进行了比较研究。结果表明:在螺旋式换热器、SSPCM和纳米流体的协同作用下,NF&;SSPCM- sghe系统的换热性能得到了显著改善,其单孔制冷量约为U-GHE系统的2.35倍;纳米流体和SSPCM是一内一外的结合,它们各自发挥作用,相互促进,相互加强。本研究成果有望实现GCHP系统的创新发展,为实现“双碳”目标提供创新路径和方法。
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来源期刊
Energy Conversion and Management
Energy Conversion and Management 工程技术-力学
CiteScore
19.00
自引率
11.50%
发文量
1304
审稿时长
17 days
期刊介绍: The journal Energy Conversion and Management provides a forum for publishing original contributions and comprehensive technical review articles of interdisciplinary and original research on all important energy topics. The topics considered include energy generation, utilization, conversion, storage, transmission, conservation, management and sustainability. These topics typically involve various types of energy such as mechanical, thermal, nuclear, chemical, electromagnetic, magnetic and electric. These energy types cover all known energy resources, including renewable resources (e.g., solar, bio, hydro, wind, geothermal and ocean energy), fossil fuels and nuclear resources.
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