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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Effects of using expander and internal heat exchanger on carbon dioxide direct-expansion geothermal heat pump
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Effects of using expander and internal heat exchanger on carbon dioxide direct-expansion geothermal heat pump

机译：膨胀机和内部换热器对二氧化碳直膨胀地热泵的影响

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In this article, the effects of using expander and Internal Heat Exchanger (IHE) have been investigated numerically in a horizontal Direct Expansion Geothermal Heat Pump (DX-GHP), based on energy and exergy analyses. Carbon dioxide (CO2) in transcritical cycle has been used as the refrigerant, and the effects of the refrigerant pressure drop on heat exchangers, including gas cooler, evaporator, and IHE have been considered. A comparative study has been conducted among four cycles: (a) the cycle with expansion valve (EVC), (b) the cycle with expander (EC), (c) the cycle with expansion valve and IHE (EVC + IHE), and (d) the cycle with expander and IHE (EC + IHE). In the numerical model, the energy and exergy analyses have been performed for four cycles in different operational conditions and two different scenarios of (1) specific heating load and (2) constant Evaporator Loop Length (ELL). The model evaluates the performance of four cycles based on the coefficient of performance (COP), heating capacity, exergy efficiency, exergy destruction rates, and ELL. As a result, the COP and the exergy efficiency of the ECs are more than that of the EVCs. Using an additional IHE in the EVC always leads to a slight increase in the COP and the exergy efficiency. However, the use of an additional IHE in the EC has no significant effect on the COP and the exergy efficiency, although, it results in a significant decrease in the ELL. Also, the increase of IHE length in the EC causes a significant reduction in the ELL.
机译：在本文中，基于能量和出境分析，使用膨胀机和内部热交换器（IHE）的效果在水平的直接膨胀地热热泵（DX-GHP）中进行了数量地研究。跨临界循环中的二氧化碳（CO2）已被用作制冷剂，并考虑了制冷剂压力下降对热交换器的影响，包括气体冷却器，蒸发器和IHE。在四个循环中进行了比较研究：（a）膨胀阀（EVC）的循环，（b）膨胀器（EC）的循环，（c）膨胀阀和IHE（EVC + IHE）的循环，和（d）带扩展器和IHE（EC + IHE）的周期。在数值模型中，在不同操作条件下的四个周期和（1）特定加热负荷的两个不同场景和（2）恒定蒸发器环长（ell）中，已经进行了能量和漏洞分析。该模型基于性能系数（COP），加热容量，高效率，漏洞破坏率和ell来评估四个循环的性能。结果，ECS的COP和ECS的Defergy效率远远超过EVC。在EVC中使用额外的IHE始终导致警察和高级效率略有增加。然而，在EC中使用额外的IHE对COP和DERERGY效率没有显着影响，尽管它导致ELL的显着降低。而且，EC中的IHE长度的增加导致ELL显着减少。

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