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Effect of borehole array geometry and thermal interferences on geothermal heat pump system

机译：井眼阵列的几何形状和热干扰对地热热泵系统的影响

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摘要

Properly sized borehole heat exchanger in geothermal heat pump system (widely known also as ground source heat pump system) needs to minimize long-term ground and working fluid temperature changes. These changes occur due to imbalances of heat extracted from the ground during winter and heat rejected into the ground during summer months, as well as thermal interferences of adjacent boreholes in borehole array. Simple calculations and spreadsheet-based analogical solutions of required borehole length for heat transfer run into difficulties when dealing with such large, complex ground source heat pump heating and cooling systems which use compact borehole array. A number of analytical computer programs are available to simulate how ground loop fluid temperature varies in such complex systems, using so-called 'g-function' - a mathematical function dependent on the geometry and shape of the borehole array. The type of calculation involves a type of 'step-function', where 24 h 'step' of peak loading is superimposed on a top of a long-term base load. In analytical simulation models, the base load is typically specified as the heating and cooling load per month of a typical year, and is simulated as the combination of sequential monthly steps. This paper will show, by simulating long-term operation of complex geothermal heat pump system with multiple boreholes in various geometric arrays, how spacing of adjacent boreholes and thermal interferences influence required borehole length for heat transfer.
机译：地热热泵系统（也称为地源热泵系统）中尺寸合适的井眼热交换器需要最大限度地减少长期的地面和工作流体温度变化。这些变化的发生是由于冬季冬季从地面提取的热量不平衡，夏季月份热量排入地下的热量不平衡，以及井眼阵列中相邻井眼的热干扰。当处理使用紧凑型井眼阵列的大型，复杂的地源热泵加热和冷却系统时，简单的计算和基于电子表格的传热所需井眼长度的模拟解决方案就遇到了困难。许多分析计算机程序都可以使用所谓的“ g函数”（一种依赖于井眼阵列的几何形状和形状的数学函数）来模拟这种复杂系统中地面回路流体温度的变化。计算类型涉及“阶跃函数”类型，其中峰值负荷的24小时“阶跃”叠加在长期基本负荷的顶部。在分析模拟模型中，通常将基本负荷指定为典型年份的每个月的加热和冷却负荷，并将其模拟为连续的每月步骤的组合。本文将通过模拟复杂的地热热泵系统的长期运行，这些系统具有多个以各种几何阵列排列的井眼，相邻井眼的间距和热干扰如何影响传热所需的井眼长度。

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