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通过修改螺旋管的几何形状来提高垂直地面热交换器的热性能:一个数值研究

Nahid Hasan¹, Md Hasan Ali¹, Nahyan Ahnaf Pratik¹

¹Department of Energy Science and Engineering, Khulna University of Engineering & Technology, Bangladesh.

|August 22, 2024

概括

为建筑物中的地热能源优化地面热交换器 (GHEs) 是关键. 将输出管置于螺旋线圈外,可显著提高7.67%的热性能,提高能源效率.

科学领域:

地热能源的利用地热能源的利用
建筑能源系统建筑能源系统
热传递增强热传递增强

背景情况:

地底源热 (GSHP) 系统依靠地底热交换器 (GHEs) 进行高效的建筑加热和冷却.
优化GHE的热性能对于最大限度地利用地热能至关重要.

研究的目的:

以计算方式研究和增强修改的螺旋管垂直GHEs的热性能.
评估设计修改对GHE热效率和能源性能的影响.
为了确定考虑热传递和压力下降的温室气体的最佳配置.

主要方法:

改造的均尖和可变尖螺旋管垂直GHEs的计算研究.
在固定的进气温度 (300.15 K) 上,分析使用水作为工作流体的 GHE 性能.
评估热性能能力 (TPC) 和性能系数 (COP) 的改进标准.

主要成果:

将出口管置于螺旋线圈外,与传统GHEs相比,热性能提高了7.67%.
由于地面土壤温度的快速和,变速螺旋式温室气体显示出微不足道的性能改善.
带有外部出口管的均尖螺旋GHE实现了最大的热性能 (TPC=1.062) 和正COP值.
高密度聚乙烯 (HDPE) 管道,混凝土填充和沙粘土土表现出优越的热性能.

结论:

外部输出管道的放置是提高螺旋GHE热性能的一种高度有效的修改.
材料选择 (HDPE管道,混凝土填充,沙土壤) 显著影响GHE效率.
优化的GHE设计,特别是与外部输出管道,为GSHP系统提供了显著的能源效率增长.

关键词:

地底热交换器换热器地下源热是一种地面源热.数字模拟数字模拟绩效改进标准是指提高绩效的标准.螺旋管的螺旋管是一个螺旋管.热性能热性能热性能

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