Evaluation of optimal subcooling in subcritical heat pump systems

被引：31

作者：

Pitarch, Miquel ^{[1
]}

Hervas-Blasco, Estefania ^{[1
]}

Navarro-Peris, Emilio ^{[1
]}

Gonzalvez-Macia, Jose ^{[1
]}

Corberan, Jose M. ^{[1
]}

机构：

[1] Univ Politecn Valencia, Inst Univ Invest Engn Energet, Cami Vera S-N, E-46022 Valencia, Spain

来源：

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2017年 / 78卷

关键词：

Heat exchanger design; Heat pump; Natural refrigerants; Optimal working point; Subcooling; OPTIMIZATION; PERFORMANCE; CYCLE; PRESSURE; CHARGE;

D O I：

10.1016/j.ijrefrig.2017.03.015

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The performance of a transcritical cycle is highly dependent on the rejection pressure. The optimal rejection pressure depends mainly on the inlet and outlet temperatures at the heat sink (secondary fluid). For the subcritical cycles, recent studies have demonstrated that the performance of these systems depends significantly on the degree of subcooling and its optimal value varies depending on the application. This paper presents a general methodology to calculate the optimal subcooling depending on the boundary conditions. The refrigerants R290, R134a, R1234yf and R32 are analyzed. Exergy analysis is used in order to see the subcooling effect at condenser and expansion valve independently. The optimal subcooling strongly depends on the temperature lift at the secondary fluid, and it is found when two pinch points are given in the condenser, one at the condenser outlet and another one inside the condenser (at the refrigerant dew point). (C) 2017 Elsevier Ltd and IIR. All rights reserved.

引用

页码：18 / 31

页数：14

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