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首页> 外文期刊>Journal of Heat Transfer >A Fast Analytical Method for the Dynamic Energy Simulation of Energy Piles With Short Time Resolution
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A Fast Analytical Method for the Dynamic Energy Simulation of Energy Piles With Short Time Resolution

机译：短时间分辨率的能量桩动态能量模拟快速分析方法

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摘要

This paper proposes an analytical method for the dynamic thermal simulation of energy piles with a short time resolution (e.g., tens of minutes) as an alternative to numerical approaches, which require relevant computational resources. The discussion is tailored to the implementation of analytical models in dynamic energy simulation software for buildings and HVAC systems. The main modeling challenges consist of accounting for the pile thermal capacity, configuration of pipes, and time-varying inlet temperature and flow rate values. The heat transfer process occurs in three characteristic periods, each of them characterized by a 2D or 3D geometry. The first period concerns the evolution of the fluid temperature and heal transfer over the length of the pipes, the second period concerns the thermal diffusion within the heat capacity of the foundation, and the third period is driven by pile geometry and ground source characteristics. For short time resolution analyses, we proposed a general linear set of equations based on the ε-NTU theory for heat exchangers, the infinite composite-medium line source solution, and the finite line source for the ground source. The proposed method is compared with a full transient 3D numerical simulation. The maximum deviation in terms of return temperature to the heat pump is 0.2 K. The general dimensionless form, the short time resolution, and the limited computational time makes the method suitable for building simulation software and optimization codes for thermal analysis and energy pile design.
机译：本文提出了一种分析方法，用于具有短时间分辨率（例如，几分钟）的能量桩动态热仿真作为数字方法的替代，这需要相关的计算资源。讨论是为建筑物和HVAC系统动态能量仿真软件中的分析模型的实施。主要建模挑战包括占桩热容量，管道配置和时变入口温度和流量值的占用。传热过程在三个特征周期中发生，每个特征在于由2D或3D几何形状表征。第一时期涉及流体温度和愈合在管道的长度上的愈合的演变，第二个时期涉及基础的热量内的热扩散，第三周期由桩几何和地源特性驱动。对于短时间分辨率分析，我们提出了一种基于ε-NTU的热交换器理论，无限复合中源溶液和地面源的有限线源的一般线性方程。将所提出的方法与全瞬态3D数值模拟进行比较。返回温度与热泵的最大偏差为0.2K。一般无量纲形式，短时间分辨率和有限的计算时间使得适用于构建仿真软件和用于热分析和能量桩设计的优化码的方法。

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