毕业设计MLSC22水冷活塞冷水机组制冷系统设计.doc
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华中科技大学文华学院
毕业设计(论文)
MLSC22水冷活塞冷水机组制冷系统设计
2012年5月22日
目 录
摘要······················································1
关键词····················································1
Abstract···················································2
Key words·················································2
前言······················································3
1. 方案论证···············································4
1.1 流程选择············································4
1.2 换热器的选择········································4
1.2.1 冷凝器的选择···································4
1.2.2 蒸发器的选择···································4
1.3 制冷剂的选择········································5
1.4 节流装置的选择······································6
1.5 压缩机的选择········································7
2.过程论述················································8
2.1 已知参数············································8
2.1.1 制冷循环的lg p-h图······························8
2.1.2 单供冷工况······································8
2.2 制冷循环热力计······································8
2.2.1 单位质量制冷量··································8
2.2.2 单位容积制冷量··································8
2.2.3 单位绝热功······································8
2.2.4 制冷系数········································8
2.2.5 制冷剂质量流量··································9
2.2.6 实际输气量······································9
2.2.7 压缩机理论功率··································9
2.2.8 单位冷凝热······································9
2.3 冷凝器的热力计算····································9
2.3.1冷凝器传热管的设计计算与校核·····················9
2.3.2 冷凝器负荷及流量计算···························10
2.3.3 冷凝结构的初步规划·····························11
2.3.4 管内水侧表面传热系数···························11
2.3.5 计算管外R22蒸气冷凝表面传热系数···············12
2.3.6 计算传热系数K和面积热流量···················13
2.3.7 计算所需的传热面积·····························14
2.3.8 计算冷却水侧流动阻力···························14
2.3.9 冷凝器的结构设计·······························14
2.4 蒸发器的设计计算···································16
2.4.1 制冷剂流量的确定························
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