Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO<sub>2</sub> System

doi:10.7652/xjtuxb201403003

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Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO₂ System

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- Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO₂ System
- Vol. 48, Issue 3, Pages: 12-16(2014)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201403003
  CLC： TB61
- Online First：10 March 2014，
  
  Published：2014
- 稿件说明：
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Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO₂ System[J]. 2014, 48(3): 12-16. DOI: 10.7652/xjtuxb201403003.
DOI：

Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO₂ System[J]. 2014, 48(3): 12-16. DOI: 10.7652/xjtuxb201403003. DOI：

摘要

为提高跨临界CO

制冷系统的性能

研究电子膨胀阀开度变化对水-水跨临界CO

制冷系统各个组件相对火用损失的影响

搭建了带电子膨胀阀的水-水跨临界CO

制冷系统实验台

测试了跨临界CO

制冷系统在恒定进水温度、不同电子膨胀阀开度下的运行参数。基于实验数据

给出了不同电子膨胀阀开度下系统性能系数、系统火用效率和各个设备组件的相对火用损失

计算了膨胀阀在最佳开度、气体冷却器侧水进口温度为30 ℃、蒸发器侧水进口温度为15 ℃时

各个设备的火用效率。基于最佳膨胀阀开度时系统内各设备的相对火用损失和火用效率的计算结果

分析了各设备性能提高的潜力。计算结果显示:膨胀阀开度在最佳值时

压缩机和气体冷却器的相对火用损失分别为总火用损失的49.4%和18.9%

设备火用效率分别为60.7%和37.6%

压缩机和气体冷却器性能有较大的提升空间。

Abstract

To improve the performance of transcritical CO

system

the effects of electronic expansion valve(EEV)opening on the exergy loss of different components in the transcritical CO

system were investigated. The experimental table for the transcritical CO

system with an EEV was constructed

and the operation parameters of the CO

system were measured under constant water inlet temperature and different EEV opening. Based on the experimental data

the effects of the EEV opening on the COP

the total exergetic efficiency of system and relative exergy loss of all components were analyzed. The exergetic

efficiency for the different components was also presented at the optimal EEV opening

and with the gas cooler side water inlet temperature of 30 ℃ and the evaporator side water inlet temperature of 15 ℃. According to relative exergy loss and exergetic efficiency for all components at the optimal EEV opening

the improvement room of the components was analyzed. The results show that the compressor and the gas cooler account for 49.4% and 18.9% of the total exergy loss respectively

and the exergetic efficiencies of these two components are 60.7% and 37.6% respectively. Thus compressor and gas cooler are endowed with abundant improving potential.

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references

LORENTZEN G, PETTERSEN J. A new efficient and environmentally benign system for car air-conditioning[J]. Int J Refrig, 1993, 16(1): 4-12.

ROBINSON D M, GROLL E A. Efficiencies of transcritical CO2 cycles with and without an expansion turbine: Rendement de cycles transcritiques au CO2 avec et sans turbine d'expansion[J]. Int J Refrig, 1998, 21(7): 577-589.

FARTAJ A, TING D S K, YANG W W. Second law analysis of the transcritical CO2 refrigeration cycle[J]. Energ Convers Manage, 2004, 45(13/14): 2269-2281.

YANG J L, MA Y T, MIN X L, et al. Exergy analysis of transcritical carbon dioxide refrigeration cycle with an expander[J]. Energy, 2005, 30(7): 1162-1175.

SARKAR J, BHATTACHARYYA S, GOPAL M R. Transcritical CO2 heat pump systems: exergy analysis including heat transfer and fluid flow effects[J]. Energ Convers Manage, 2005, 46(13/14): 2053-2067.

TAO Y B, HE Y L, TAO W Q. Exergetic analysis of transcritical CO2 residential air-conditioning system based on experimental data[J]. Appl Energ, 2010, 87(10): 3065-3072.

BAEK C, HEO J, JUNG J, et al. Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode[J]. Int J Refrig, 2013, 36(4): 1276-1284.

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Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO2 System

DOI：10.7652/xjtuxb201403003

摘要

Abstract

关键词

Keywords

references

Experimental Investigation for Effects of Electronic Expansion Valve Opening on Exergy Loss in Transcritical CO₂ System