Flow Characteristic of Variable Diameter Capillary Tube for Heat-pump Air Conditioner with R410A

He Qinbo; Yan Geni; Xu Yansheng

doi:10.3969/j.issn.0253-4339.2018.03.039

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Flow Characteristic of Variable Diameter Capillary Tube for Heat-pump Air Conditioner with R410A

更新时间：2024-07-18

- Flow Characteristic of Variable Diameter Capillary Tube for Heat-pump Air Conditioner with R410A
- Journal of Refrigeration Vol. 39, Issue 3, (2018)
- 作者机构：
  
  顺德职业技术学院广东高校热泵工程技术开发中心
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2018.03.039
  CLC：
- Published：2018
- 稿件说明：
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He Qinbo, Yan Geni, Xu Yansheng. Flow Characteristic of Variable Diameter Capillary Tube for Heat-pump Air Conditioner with R410A[J]. Journal of refrigeration, 2018, 39(3).
DOI：

He Qinbo, Yan Geni, Xu Yansheng. Flow Characteristic of Variable Diameter Capillary Tube for Heat-pump Air Conditioner with R410A[J]. Journal of refrigeration, 2018, 39(3). DOI： 10.3969/j.issn.0253-4339.2018.03.039.

摘要

为减少变径毛细管在R410A冷暖空调器应用中的匹配实验工作量，利用节流元件制冷剂流量测试台对多个结构尺寸规格的变径毛细管进行了R410A制冷剂流量测试，建立了基于阻抗计算方法的流量特性经验模型。利用该模型计算出KFR-32GW冷暖空调器所需变径毛细管的初步结构尺寸，并在该冷暖型空调器上进行精确匹配实验，确定最佳变径毛细管结构尺寸。实验结果表明：采用变径毛细管节流的空调器相对采用毛细管组件节流的空调器，制冷量减少了0.3%，制冷能效比不变，制热量增加了0.5%，制热能效比减少了0.3%，两者的性能指标基本相同。因此变径毛细管可以代替毛细管组件应用于R410A冷暖空调器，且通过实验方法建立的变径毛细管R410A制冷剂流量特性经验模型精度较高，可以满足实际工程应用。

Abstract

A variable diameter capillary tube consisting of two serially connected capillary tubes with different diameters was invented to replace a conventional expansion device. The mass flow rates of refrigerant R410A in variable diameter capillary tubes with various sizes were tested. A model of the variable diameter capillary tube is proposed

and a numerical algorithm for the tube length and mass flow rate is developed. The experimental results show that

in a performance comparison between a variable diameter capillary tube system and a capillary tube assembly system

the cooling capacity of the former is reduced by 0.3%

their energy efficiency ratio (EER) is equal

the heating capacity is increased by 0.3%

and the coefficient of performance (COP) is decreased by 0.3%. That is

the performance index of the two kinds of throttle mechanism is almost identical. This indicates that the variable diameter capillary tube can completely replace the capillary tube assembly in an R410A heat pump type air conditioner. The model is validated using experimental data

and the results show that the model can be used for sizing and rating a variable diameter capillary tube.

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Related Institution

School of Mechanical Engineering, Shanghai Jiao Tong University

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