《MLSC33活塞水冷制冷系统》》-毕业论文.doc

PAGE 华中科技大学文华学院 毕业设计（论文） MLSC33水冷活塞冷水机组制冷系统设计 2012 年5 月10日 目 录 摘要······················································1 关键词····················································1 Abstract···················································2 Key words·················································2 前言······················································2 1. 方案论证···············································3 1.1 流程选择············································3 1.2 换热器的选择········································3 1.2.1 冷凝器的选择···································3 1.2.2 蒸发器的选择···································3 1.3 制冷剂的选择········································4 1.4 节流装置的选择······································4 1.5 压缩机的选择········································5 2.过程论述················································6 2.1 已知参数············································6 2.1.1 制冷循环的lg p-h图······························6 2.1.2 单供冷工况·····································6 2.2 制冷循环热力计·····································7 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·································8 2.2.6 实际输气量·····································8 2.2.7 压缩机理论功率·································8 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·····························10 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···························15 2.3.9 冷凝器的结构设计·······························15 2.4 蒸发器的设计计算·········