机械5

300KW螺杆式水冷冷水机组设计 摘要 螺杆式水冷冷水机组因其关键部件螺杆式压缩机而命名，螺杆式水冷冷水机组是目前应用最为广泛的制冷机组之一。本文设计的是制冷量为300KW的水冷机组。其中制冷剂为R22，系统制冷量为300KW，冷凝温度40℃，蒸发温度2℃，过冷度3℃，过热度9℃，冷却水进水温度30℃，出口温度35℃，冷冻水进水温度12℃，出水温度7℃。 本设计主要部件选用的是汉钟半封闭螺杆双压缩机、卧式壳管式冷凝器（外形尺寸为2780mm×600mm×708mm，传热面积为57.546m2）、干式蒸发器（外形尺寸为2800mm×600mm×592mm，传热面积为17.64m2）和热力膨胀阀。除此以外，本文还完成了压缩机的选型、热力计算、以及辅助设备的选型问题。 关键词冷水机组/壳管式冷凝器/干式蒸发器/设计计算 A Desig
n of Screw Water Chiller with Capacity of 600 kW ABSTRACT Evaporative co
nde
nser chillers is
named as its key part evaporative co
nde
nsers. It is o
ne of the widely used chillers
now. I
n the dissertatio
n, the refrigera
nt is R22, a
nd refrigeratio
n capacity is 300KW.Co
nde
nsi
ng temperature is 40℃. The i
nlet a
nd outlet temperature of cooled water are 30℃ a
nd 35℃, respectively. The subcooli
ng temperature is 3℃. The superheati
ng temperature is 9℃. A
nd the evaporatio
n temperature is 2℃.The i
nlet a
nd the outlet temperature of chilled water is 12℃ a
nd 7℃, respectively. The HANBELL semi-hermetic si
ngle-screw compressor, horizo
ntal tube a
nd shell co
nde
nser with the shape dime
nsio
n of 2780mm×600mm×708mm a
nd the heat tra
nsfer area of 57.546 , dry-type evaporator with the shape dime
nsio
n of 2800mm×600mm×592mm a
nd the heat tra
nsfer area of 17.64a
nd the thermal expa
nsio
n valve are chose
n as mai
n compo
ne
nts of the desig
n. Besides, the choice of compressor, heat a
nalysis, the choice of the selectio
n of the role auxiliary equipme
nts are also completed. KEY WORDS water chiller, shell a
nd tube co
nde
nser, dry evaporator co
nde
nser, desig
n calculatio
n. 目录 中文摘要I 英文摘要II 1绪论1 1.1引言1 1.2国内外发展状况1 1.3存在的问题及发展前景3 2设计说明5 2.1设计的要求与数据5 2.2本设计的研究内容6 2.3设计参数的确定6 2.3.1设计原始参数6 2.3.2已知设备6 2.3.3蒸发温度，冷凝温度的确定7 3制冷剂的选择7 3.1螺杆式制冷机组常用的制冷剂7 3.2制冷剂热力学性质的要求10 3.3制冷剂物理化学性质的要求11 4热力计算11 5压缩机的分类与选择14 5.1压缩机的分类14 5.2压缩机的计算与选择16 6壳管式冷凝器的设计计算17 6.1传热管的选择及计算17 6.2结构设计计算24 6.2.1管板24 6.2.2分程隔板25 6.2.3拉杆与定距管26 7干式蒸发器的设计及计算30 7.1蒸发器的概述30 7.2设计及计算31 8附件设备的选型36 8.1节流阀的分类和选型36 8.1.1节流阀的分类36 8.1.2热力膨胀阀的选择37 8.2油分离器的选型38 8.3干燥过滤器的选型39 8.4气液分离器的选型40 8.5视液镜的选型40 9制冷剂充注量的计算41 9.1制冷剂充注量的组成41 9.1.1冷凝器充液量的计算42 9.1.2蒸发器充液量的计算42 9.1.3液管充液量的计算43 9.1.4吸气管充液量的计算43 9.1.5排气管充液量的计算43 结论45 致谢46 参考文献47