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Integrated model for comparison of one- and two-pipe ground-coupled heat pump network configurations

机译：用于比较单管和双管耦合热泵网络配置的集成模型

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摘要

Several network configurations are possible when designing the interior portion of centralized ground-coupled heat pump systems. In this study, three different configurations are examined: Two-pipe networks with either a direct-return or a reverse-return and one-pipe systems. One-pipe networks typically require less piping than two-pipe systems. However, heat pump energy consumption might be higher because the inlet temperature to the heat pumps tends to increase (in cooling) or decrease (in heating) along the network. In the current study, a versatile integrated modeling tool is developed in the TRNSYS environment to study the energy consumption (pumps and heat pumps) of each type of network. A control method for one-pipe systems, based on the bore field return temperature, is also proposed. The tool is first compared to detailed individual models in annual simulations where it is shown to give good results. The results obtained with four different case studies indicate that the total annual energy consumption of one-pipe networks is up to 5% higher than two-pipe networks even though the pumping energy is 4% to 53% lower than two-pipe networks. No significant differences are observed in the required borehole length.
机译：在设计集中式接地热泵系统的内部部分时，可以进行几种网络配置。在这项研究中，检查了三种不同的配置：双管网，具有直接返回或反向返回和一个管道系统。一管网络通常需要比双管道系统更少的管道。然而，热泵能量消耗可能更高，因为热泵的入口温度趋于增加（冷却）或沿着网络的减少（在加热中）。在目前的研究中，在Trnsys环境中开发了一种多功能的集成建模工具，以研究每种网络的能量消耗（泵和热泵）。还提出了一种基于孔场返回温度的单管系统的控制方法。该工具首先与年度模拟中的详细各个模型相比，其中显示给出良好的结果。四种不同案例研究获得的结果表明，即使泵送能量低于双管网，一管网络的年度能耗高达5％高达5％。在所需的钻孔长度中没有观察到显着差异。

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