文键,刘育策,王春龙,王斯民

• 1:西安交通大学能源与动力工程学院
• 2:西安交通大学化学工程与技术学院

摘要(Abstract)：

新型制冷工质R450A是R134a的一种替代品,环保可靠,针对它的研究目前尚较少,有限研究主要侧重于简单蒸气压缩制冷循环。研究构建了喷射器数学模型,对比分析了R450A在新型喷射制冷循环中不同喷射器特性及工况下的制冷性能。研究发现在喷射制冷循环中,引射流体的压降,工作流体与引射流体的混合面积比对循环COP,单位容积制冷量和喷射器压缩效率影响呈抛物线形变化,存在最优的引射流体压降10 kPa和工作流体与引射流体混合面积比7,并且最佳的引射流体压降及工作流体与引射流体混合面积比随着冷凝温度的升高而增大。此外,相比传统的蒸气压缩制冷循环,新型喷射制冷循环中R450A的COP和单位容积制冷量分别增大14.6%～20.6%和21.1%～21.7%,系统性能显著提高。同时,喷射器喷嘴和扩压室效率对系统性能影响显著,且扩压室效率的影响更强。

关键词(KeyWords)： R450A;喷射器;△P;制冷性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51676146)

作者(Author): 文键,刘育策,王春龙,王斯民

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