Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO<sub>2</sub>, R134a, and R410A Two-phase Thermosyphon Loops

Tong Zhen; Wen Xinran; Han Zekun; Fang Chunxue; Song Yulong

doi:10.3969/j.issn.0253-4339.2024.04.028

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Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO₂, R134a, and R410A Two-phase Thermosyphon Loops

Refrigerant Substitution Technology | 更新时间：2024-09-02

- Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO₂, R134a, and R410A Two-phase Thermosyphon Loops
- Journal of Refrigeration Vol. 45, Issue 4, Pages: 28-35(2024)
- 作者机构：
  
  青岛理工大学环境与市政工程学院　青岛　 266033
- 作者简介：
  
  Tong Zhen, female, associate professor, School of Environmental and Municipal Engineering, Qingdao University of Technology, 86-13791977035, E-mail: tong-tong@foxmail.com. Research fields: data center cooling technology, two-phase thermosyphon loop (TPTL) technology.
- 基金信息：
  
  the National Natural Science Foundation of China(51906118)
- DOI：10.3969/j.issn.0253-4339.2024.04.028
  CLC： TB657.5;TK172.4
- Received：02 January 2024，
  
  Revised：2024-03-26，
  
  Accepted：17 April 2024，
  
  Published：16 August 2024
- 稿件说明：
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Tong Zhen, Wen Xinran, Han Zekun, et al. Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO₂, R134a, and R410A Two-phase Thermosyphon Loops[J]. Journal of Refrigeration, 2024, 45(4): 28-35.
DOI：

Tong Zhen, Wen Xinran, Han Zekun, et al. Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO₂, R134a, and R410A Two-phase Thermosyphon Loops[J]. Journal of Refrigeration, 2024, 45(4): 28-35. DOI： 10.3969/j.issn.0253-4339.2024.04.028.

摘要

通过实验研究了上升管和下降管阻力对CO

、R134a和R410A 分离式热管传热性能的影响，分析了热管传热极限和传热热阻的变化规律。研究发现阻力变化对不同工质热管的影响不同，对于CO

热管，上升管阻力和下降管阻力对其传热性能的影响程度接近，当上升管或下降管阀门开度从90°降至30°时，CO

热管的传热极限均由1 200 W降为700 W。对于R134a和R410A热管而言，上升管阻力对其传热性能的影响更大，当上升管阀门开度从90°降至30°时，R410A热管的传热极限由1 300 W降为700 W，R134a热管则未出现正常运行状态，管内始终存在较大的过热过冷度，两种热管的传热热阻也显著增大。而下降管阻力增大对R134a和R410A热管的传热性能几乎无影响。因此，在实际工程设计中，CO

热管应采用上升管和下降管管径相同或相近的结构，而R134a和R410A 热管适合采用上升管管径明显大于下降管管径的结构，以达到节省管材的目的。

Abstract

This study experimentally investigates the impact of flow resistance in risers and downcomers on the heat transfer performance of two-phase thermosyphon loops (TPTLs) with CO

R134a

and R410A refrigerants. Variations in the heat transfer limit and thermal resistance of the TPTLs were analyzed. The results show that the three TPTLs respond differently to changes in flow resistance. For the CO

TPTL

the effects of the riser and condenser resistances on thermal performance are similar. When the opening angle of the riser or condenser valve decreases from 90° to 30°

the heat transfer limit of the CO

TPTL decreases from 1 200 W to 700 W. For the R134a and R410A TPTLs

when the opening angle of the riser valve decreases from 90° to 30°

the heat transfer limit of the R410A TPTL decreases from 1 300 W to 700 W

and the R134a TPTL does not

reach normal operating conditions

resulting in substantial superheating and subcooling inside the pipes and a substantial increase in thermal resistance for both types. An increase in the condenser resistance has little effect on the thermal performances of the R134a and R410A TPTLs. For practical design considerations

the same or similar diameters should be used for the riser and downcomer of a CO

TPTL. However

for R134a and R410A TPTLs

the riser diameter should be significantly larger than the downcomer diameter to achieve material cost savings.

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Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO2, R134a, and R410A Two-phase Thermosyphon Loops

DOI：10.3969/j.issn.0253-4339.2024.04.028

摘要

Abstract

关键词

Keywords

references

Effect of Flow Resistance in Adiabatic Part on the Thermal Performance of CO₂, R134a, and R410A Two-phase Thermosyphon Loops