Heat transfer pinch point of zeotropic refrigerants in  condenser with air-conditioning operation

ZHAO Li; ZHU Yu; WANG Xiaodong; HAN Jiansheng

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Heat transfer pinch point of zeotropic refrigerants in  condenser with air-conditioning operation

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- Heat transfer pinch point of zeotropic refrigerants in  condenser with air-conditioning operation
- CIESC Journal Issue 10, Pages: 2450-2454(2007)
- 作者机构：
  
  天津大学机械工程学院热能系清华大学相变与界面传递现象实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 October 2007，
  
  Published：05 October 2007
- 稿件说明：
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ZHAO Li, ZHU Yu, WANG Xiaodong, et al. Heat transfer pinch point of zeotropic refrigerants in  condenser with air-conditioning operation[J]. CIESC Journal, 2007, (10): 2450-2454.
DOI：

ZHAO Li, ZHU Yu, WANG Xiaodong, et al. Heat transfer pinch point of zeotropic refrigerants in  condenser with air-conditioning operation[J]. CIESC Journal, 2007, (10): 2450-2454. DOI：

摘要

为了揭示15种常用非共沸制冷剂在空调工况下冷凝器中的传热窄点特征;探明它们和换热流体间温差的沿程变化规律;以及如何防止传热窄点的产生;进行了相应的理论分析。首先;建立了制冷剂的冷凝换热模型;明确了冷凝过程中传热窄点产生的条件;并根据标准的空调工况确定了15种制冷剂的冷凝物性参数。然后;利用制冷剂状态方程得到冷凝过程中温度与焓值的对应关系;并分段计算了焓随温度的变化率;进而得到15种制冷剂冷凝过程中发生传热窄点现象的概率。最后;针对10种可能发生传热窄点现象的制冷剂给出了换热流体温差控制范围;为合理选择制冷剂和设计运行工况提供了一定的理论依据。

Abstract

The research on heat transfer pinch point (between refrigerant and heat-transfer fluid) was carried out in a condenser with airconditioning operation to investigate the change in temperature difference from condenser inlet to outlet and to avoid the occurrence of pinch pointFirstly

a model of refrigerants condensation was built

and the condition of pinch point occurrence was determinedThe condensation parameters of 15 commonly used refrigerants were decided for standard airconditioning operationSecondly

the equations of state of refrigerants were used to compute and obtain some relationships between temperature and enthalpy and the probability of pinch point occurrence of 15 refrigerants was obtainedLastly

the ranges of temperature difference from condenser inlet to outlet were recommended to avoid the occurrence of pinch point for 10 refrigerantsSuch information might be helpful to choosing refrigerants and adjusting the operation of condenser in airconditioner units.

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