摘要热泵是一种可以通过高位能使热量从低位热能流向高位热源的节能装置，热泵 机组在冬夏都能使用，在夏天制冷，冬天制热。这样锅炉房和冷却水系统就可以不用 设计布置，节约了大量运行和维修成本。它安装灵活方便，系统简单不占用机房，一 般放置楼顶，同时还可以满足热水的需求。因为机组运行采用的是微电脑控制，发生 错误的概率很小，可靠性较高。所以目前风冷热泵在许多空调工程中能得以广泛采用。83991

本文就风冷热泵中央空调的性能、系统、工程设计等进行分析，并设计一台风 冷热泵机组包括压缩机、冷凝器、蒸发器、热力膨胀阀及各类辅助设备的设计，通过 上述设备工作所能达到的制冷量、制热量、COP 值等然后完成 20kW 风冷热泵机组设 计。由此使我们知道了设计时应该注意的问题，了解绿色建筑与中央空调的关系，以 此得出中央空调系统具有节能、运用可靠、应用灵活方便等优点，适宜某些建筑，如 多居室、别墅、办公室、娱乐场所、大型商场等地方使用使用。

毕业论文关键词：风冷热泵；压缩机；蒸发器；冷凝器；热力膨胀阀

Abstract It is a heat pump can make high energy-saving means of heat energy from the low flow high heat source, heat pump units can be used in summer and winter, in the summer cooling and winter heating。 Such boiler and cooling water systems can not design and layout, saving a lot of operation and maintenance costs。 It is flexible and convenient installation, the system simply does not take up room, generally placed the roof, and also to meet the hot water needs。 Microcomputer control unit operation, high reliability。 Cooled heat pump air conditioner so many projects to be widely used。In this paper, air-cooled heat pump central air conditioning performance, systems, engineering design analysis to do, and told us to design a wind cold heat pump how to choose a compressor, condenser, evaporator, thermal expansion valve and various auxiliary equipment by  these devices work can achieve cooling capacity, heating capacity, COP values, etc。 and then complete 20kw air source heat pump design。 Whereby we know that the design should pay attention to the problem, understand the relationship between green building and central air-conditioning, central air conditioning system in order to obtain energy saving, the use of reliable, flexible and easy, suitable for certain buildings, such as multi-room, villas, offices, entertainment venues, shopping malls and other places use。

Keywords: air-cooled heat pump; Chiller; evaporator; compressor condenser; thermal expansion valve

目录

第一章 绪论 1

1。1 研究的背景和意义 1

1。2 存在问题 1

1。3 设计内容 1

第二章 风冷热泵机组的方案论证 2

2。1 热泵机组的介绍 2

2。2 制冷方法 2

2。3 制冷剂 2

2。3。1 制冷剂的作用 2

2。3。2 制冷剂的基本要求 2

2。3。3 制冷剂的分类 3

2。3。4 制冷剂的确定 5

2。4 压缩机 5

2。4。1 压缩机的分类 6

2。4。2 压缩机种类的确定 7