Fundamentals and Applications of Stepped Pressure Cycle

Cao Xiang; Zhang Chunlu

doi:10.3969/j.issn.0253-4339.2021.03.028

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Fundamentals and Applications of Stepped Pressure Cycle

更新时间：2024-07-18

- Fundamentals and Applications of Stepped Pressure Cycle
- Journal of Refrigeration Vol. 42, Issue 3, (2021)
- 作者机构：
  
  1. 同济大学机械工程博士后流动站
  2. 同济大学机械与能源工程学院制冷与低温工程研究所
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2021.03.028
  CLC：
- Published：01 January 2021
- 稿件说明：
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Cao Xiang, Zhang Chunlu. Fundamentals and Applications of Stepped Pressure Cycle[J]. Journal of refrigeration, 2021, 42(3).
DOI：

Cao Xiang, Zhang Chunlu. Fundamentals and Applications of Stepped Pressure Cycle[J]. Journal of refrigeration, 2021, 42(3). DOI： 10.3969/j.issn.0253-4339.2021.03.028.

摘要

为了提升燕气压缩式制冷/热泵装置的能效

提出了一种新循环一一梯级吸排气循环。通过设置数个具有一定梯度的吸排气压力

实现制冷剂对换热流体温度的梯形逼近

有效减小蒸发器与冷凝器的传热不可逆损失

同时降低循环压比。梯级吸排气循环的实际节能效果受多种因素影响

研究表明:换热流体温度变化幅度以及蒸发器与冷挺器传热能力强弱对其节能幅度的影响超过6.5%;不合理的过冷度设计甚至会导致其丧失节能性。最后

本文基于实践案例对梯级吸排气循环在实际应用中的节能效果进行介绍。

Abstract

A stepped pressure cycle is proposed to improve the energy efficiency of refrigeration and heat pump cycles. By constructing multiple suction and discharge pressures

the refrigerant temperatures in the evaporators and condensers underwent step changes and approached the heat source temperatures. This helps to improve heat transfer efficiency and reduce the compression ratio. However

we found that the conclusion of energy savings for the stepped pressure cycle is conditional. Over 6.5% of the energy-saving potential is reduced because of inefficient heat exchangers or a small temperature glide of the heat transfer fluid. Moreover

an excessive subcooling degree will lead to a worse COP than a simple cycle. Finally

in this study

some application cases are summarized to demonstrate the energy-saving potential of the stepped pressure cycle.

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Related Institution

上海理工大学制冷技术研究所

Key Laboratory of Medium-Low Temperature Energy Efficient Utilization of Ministry of Education, Thermal Energy Research Institute

School of Energy and Power Engineering, University of Shanghai for Science and Technology

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Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce

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