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| 重力供液蒸发器的实验研究 |
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孙志利,臧润清,马玉草
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| (孙志利(天津制冷技术重点实验室,天津,300134);臧润清(天津商业大学制冷与低温工程系,天津,300134);马玉草(内蒙古工业大学建筑工程学院,呼和浩特,010051)?) |
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| 摘要: |
| 采用R404A作为制冷剂对重力供液蒸发器在低温工况下的特性进行实验研究,建立重力供液蒸发器的传热模型,搭建重力供液蒸发器的实验装置,用热平衡法测试重力供液蒸发器在不同蒸发器供液高度下的运行特性.研究表明:供液压头在h1=1200mm时比供液压头在h1=800mm、h1=1000mm时的传热温差明显下降,且随着室内温度的下降,传热温差随之变小;在同一供液高度下,重力供液蒸发器的循环倍率n随蒸发温度的降低而增大,而在不同供液高度下,循环倍率n随供液高度的升高而增大;重力供液蒸发器在供液高度h_1=1000mm时的制冷量明显高于h_1=800mm时的制冷量,其最大增幅为16.9%;而h_1=1200mm时其制冷量与h_1=1000mm很接近,甚至会有所下降;与h1=800mm相比,h_1=1000mm时重力供液制冷系统COP大幅度增加,最大增幅为17%,h_1=1200mm时系统COP介于前两者之间,重力供液制冷系统存在最佳的蒸发器供液高度. |
| 关键词: 热工学 重力供液蒸发器 循环倍率 传热特性 热平衡 |
| DOI：10.3969/j.issn.0253-4339.年份（4位数字）.月份（2位数字）.文章的起始页码（3位数字） |
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| Experimental Study on Evaporator with Liquid Refrigerant Supply by Gravity |
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Sun Zhili Zang Runqing Ma Yucao
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| (Sun Zhili1 Zang Runqing2 Ma Yucao3(1.Tianjin Key Laboratory of Refrigeration Technology,Tianjin,300314,China,2.Dep,of Refrigeraion & Cryogenics,Tianjin University of Commerce,3.The College of Civil Engineering , Architecture,Inner Mongolia University of Technology Hohhot,010051,China)) |
| Abstract: |
| The characteristics of an evaporator using R404A with liquid refrigerant supply by gravity were investigated at lower temperature.A heat transfer model of an evaporator with liquid refrigerant supply by gravity was established.The experiment was conducted using the thermal balance method to obtain the operation characteristics of an evaporator with liquid refrigerant supply by gravity in different supply height.The results indicate that the logarithmic temperature difference between the evaporator and the i... |
| Key words: Pyrology Evaporator with supplying liquid refrigerant by gravity Circulating ration Heat transfer characteristics Thermal balance |
