Simulation on the Performance of Adiabatic Capillary Tube in CO<sub>2</sub> Transcritical Refrigeration System

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Simulation on the Performance of Adiabatic Capillary Tube in CO₂ Transcritical Refrigeration System

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- Simulation on the Performance of Adiabatic Capillary Tube in CO₂ Transcritical Refrigeration System
- Vol. 45, Issue 11, Pages: 16-21(2011)
- 作者机构：
  
  西安交通大学流体机械与压缩机国家工程研究中心,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TB62
- Online First：10 November 2011，
  
  Published：2011
- 稿件说明：
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Simulation on the Performance of Adiabatic Capillary Tube in CO₂ Transcritical Refrigeration System[J]. 2011, 45(11): 16-21.
DOI：

Simulation on the Performance of Adiabatic Capillary Tube in CO₂ Transcritical Refrigeration System[J]. 2011, 45(11): 16-21. DOI：

摘要

建立了CO

制冷系统中绝热毛细管一维稳态分布参数模型

以研究跨临界CO

系统中毛细管的性能和流动特性.分别采用3种不同摩擦系数关联式(Churchill、Colebrook、Bittle

Pate关联式)进行模拟和比较

研究了CO

在毛细管内的温度、压力、焓、熵及干度等的沿程分布规律.分析了管径、入口压力、入口温度和背压等4个参数对毛细管质量流量的影响

并考虑了壅塞现象.结果表明:采用Churchill和Colebrook关联式的效果较好

92%的计算值误差在10%以内

而Bittle

Pate关联式不适用于CO

绝热毛细管计算

因为它未考虑毛细管内壁的粗糙度; 背压对质量流量影响很小

即使发生壅塞

壅塞质量流量和未壅塞时的质量流量差别也不大.

Abstract

A one dimension homogeneous steady model of adiabatic capillary tubes in CO

transcritical refrigeration systems was established to evaluate the performance and the flow characteristics of capillary tubes. The simulation results by using three different friction factor correlations(Churchill

Colebrook

Bittle

Pate)were compared with each other. The distributions of temperature

pressure

enthalpy and entropy along the tube length were investigated. The influences of four parameters(inner diameter

inlet pressure

inlet temperature

back pressure)on the mass flow rate were explored

and the chocking phenomenon was analyzed. The results show that the Churchill correlation and the Colebrook correlation predict 92% of the refrigerant mass flow rates with

an error of less than 10% while the Bittle

Pate correlation may be unsuitable for simulating the flow in CO

capillary tubes due to its neglect of the inner wall roughness of capillary tubes. The back pressure has slight influence on the mass flow rate. In addition

the rate of mass flow without chocking is approximately equal to that with chocking.

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Keywords

references

KIM M, PETTERSEN J, BULLARD C W.制冷空调装置智能仿真[M].北京:科学出版社,2002:24-25.

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Simulation on the Performance of Adiabatic Capillary Tube in CO2 Transcritical Refrigeration System

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摘要

Abstract

关键词

Keywords

references

Simulation on the Performance of Adiabatic Capillary Tube in CO₂ Transcritical Refrigeration System