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Parametric study on the performance of the earth-to-air heat exchanger for cooling and heating applications

机译：用于冷却和加热应用的地球换热器性能的参数研究

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To reduce energy consumption, the earth-to-air heat exchanger (EAHE) is a suitable technique for cooling and heating buildings. This paper studies numerically the effect of some design parameters (pipe diameter, inlet condition, pipe length, and outlet condition) on the overall performance of the EAHE system. Four diameters of the EAHE pipe (2, 3, 4, and 6 in) are studied and this numerical study has been done for summer and winter seasons for Nasiriyah city in southern Iraq. First, the built numerical model was validated against the experimental model, and the results of comparison showed a good consensus. After the validation and by using computational fluid dynamics modeling, the overall performance of the EAHE system with all pipe diameters was analyzed with ranges of air velocity, DBT or inlet temperature, and a pipe length of 50 m. The simulated results showed that the EAHE system with 6 in pipe diameter has the best values of overall performance, but from the thermal performance point of view, the 2 in pipe diameter is more suitable.
机译：为了减少能耗，地球到空气热交换器（EAHE）是一种用于冷却和加热建筑物的合适技术。本文研究了一些设计参数（管道直径，入口条件，管材长度和出口条件）对EAHE系统的整体性能的影响。研究了四个直径（2,3,4和6英寸），并为伊拉克南部的Nasiriyah市夏季和冬季进行了这个数值研究。首先，对实验模型验证建立的数值模型，比较结果表明良好的共识。在验证和通过使用计算流体动力学建模之后，通过空气速度，DBT或入口温度的范围分析了具有所有管道直径的EAHE系统的整体性能，以及50米的管道长度。模拟结果表明，管道直径为6的EAHE系统具有最佳的整体性能值，但从热性能的观点来看，管道直径的2个更合适。

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