R22压缩式制冷机组设计、性能分析的计算机软件

符号表h比焓，)/(kgKJV体积，m3；体积流量，m3/sK传热系数，)/(2KmWv流速，m/s；比容m3/kgk绝热指数，vm质量流速，)/(2smkgL长度，mW功，J或KJM质量流量，kg/sw比功，J/kg或KJ/kgm质量，kgx湿蒸气得干度，%n转速，r/minz气缸数，个A面积，2mmt湿空气湿球温度，℃C热容量，)/(KkgKJT绝对温度，K或℃c比热，)K/(kgKJtT,温差K或℃pc定压比热，)K/(kgKJt摄氏温度，℃Vc定容比热，)K/(kgKJTK，tK冷凝温度，K或℃dD,直径，mT0，t0蒸发温度，K或℃F力，NU内能，KJH焓，kJu比内能，KJ/kgP功率，W或KW换热系数，)/(2KmWp压力，Pa制冷系数PK冷凝压力，barc逆卡诺循环制冷系数Q热量，J或KJth理论循环制冷系数kq冷凝器单位热负荷，KJ/kg热力系数0q单位质量制冷能力，KJ/kgc卡诺循环的热效率重庆大学本科学生毕业设计（论文）符号表Vq单位容积制冷能力，KJ/m3d压缩机的传动效率i压缩机的指示效率o低压；低温或外侧m压缩机的摩擦效率p压力或定压过程e电动机效率r制冷剂R制冷循环的制冷效率s饱和状态或定熵过程V压缩机的容积效率t温度或定温过程R潜热，KJ；热阻，WKm/2f肋片效率eR雷诺数i指示值；定焓过程；r比潜热，KJ/kgk高压或高温S熵，KJ/Kl长度或潜热s比熵，)K/(kgKJm质量或机械量材料的导热系数，)/(kmWV体积供热系数；动力粘度，2/msNw冷却水v运动粘度，m2/sev蒸发密度，kg/m3cr临界状态传湿系数，)/(2smkg肋化系数热流量，W或KWk冷凝器热负荷，W或KW0制冷量。W或KW空气的相对湿度，%热流密度W/m2或KW/m2下角标a空气或绝热过程b沸腾重庆大学本科学生毕业设计（论文）符号表c逆卡诺循环重庆大学本科学生毕业设计（论文）中文摘要I摘要随着科学技术的发展，人们对自身生存的环境有着越来越多的要求，空调、冰箱等制冷装置已经走进千家万户，而对这些制冷装置进行性能分析，性能调节以达到节能、高效、环保等目的已受到诸多专家和公众的关注。本文以制冷机组为对象结合计算机程序的编制展开研究，分析了制冷压缩机的工作特性，即分析其制冷量、耗功率以及需要在冷凝器排出的热量与蒸发温度和冷凝温度所呈的函数关系，进而分析了压缩机-冷凝器-蒸发器联合工作时的性能，即制冷量、耗功率与冷凝器冷却水进口温度及蒸发器进口空气温度的函数关系，还分析了整个制冷机组与外界因素冷凝器冷却水进口温度、蒸发器进口空气温度和冷却水流量、蒸发器进口空气流量的函数关系，拟合出制冷剂R22的热物性系数的公式算法并由C语言写出计算机软件对其进行计算，得出关系曲线。以R22为制冷剂，制冷量为116kW为案例，用此程序对其进行机组设计并对其进行性能分析，本文从冷凝器构造及冷凝器面积、蒸发器构造及蒸发器面积、压缩机容量方面对其进行设计，并分析了该机组与外界因素的关系。关键词：制冷，性能分析，软件，热力学性质，R22重庆大学本科学生毕业设计（论文）ABSTRACTIIABSTRACTWiththedevelopmentofscienceandtechnology,peoplehavemoreandmorerequirementsforthelivingenvironment.Air-condition,refrigeratorandotherrefrigerationdeviceshavebeenboughtbymanyfamilies.Sotheanalysisabouttheperformanceofthoserefrigerationdevicesisnecessary,andtheperformancetuningtoachievethepurposeofenergysaving,highefficiency,andenvironmentalfriendlyhasattractedtheattentionofexpertsandthepublic.Withtherefrigerationunitforobjectcombinecomputerprogramming,thisarticleanalysesthethermodynamicpropertiesoftheR22refrigerantandobtaintheformulasofit.Firstofall,thearticleanalysesthecharacteristicsofcompressor,suchastherefrigeratingcapacity,consumptionpower,heatfromcondenser,evaporationtemperatureandcondensatetemperature,therelationshipbetweenthem.Alsogeneratechartsofit.Thenthisarticleanalysescompressor-condenser-evaporatorassociatedworkingcharacteristicsthatrefrigeratingcapacity,consumptionpower,heatfromcondenser,evaporationtemperature,inlettemperatureofcoolingwaterinthecondenser,importtemperatureofairintheevaporator,therelationshipbetweenthem,besides,analysestherelationshipofthewholerefrigerationsystemwithexternalfactors.Atlast,inthecasethatR22forrefrigerantsandtherefrigeratingcapacityis116kW,usingthecomputerprogrammingtoanalysesthiscase.Gettheareaofcondenserandevaporator.Besides,gettherelationshipofthewholerefrigerationsystemwithexternalfactors.Keywords：Refrigeration,performance,software,thermodynamicproperties,R22重庆大学本科学生毕业设计（论文）目录III目录摘要......................................................................................................................................IABSTRACT..............................................................................................................................II1绪论：...................................................................................................................................11.1研究背景............................................................................................................................11.2实现制冷的方式.......................................................................................................21.3电子计算机技术在制冷上的应用............................................................................42活塞式制冷机组工作原理及组成........................................................................62.1工作原理...........................................................................................................................62.2制冷机组的组成...............................................................................................................63制冷机组性能与内外部参数的函数关系........................................................93.1制冷压缩机.......................................................................................................................93.1.1活塞式制冷压缩机的活塞排量...........................................................................93.1.2制冷压缩机的制冷量和耗功率..........................................................................103.2冷凝器.............................................................................................................................103.2.1冷凝器中的传热过程.......................................................................................103.2.2管壁与垢层的热阻.............................................................................................153.2.3冷凝器的设计计算.............................................................................................163.3蒸发器...........................................................................................................................173.3.1蒸发器的传热过程...........................................................................................173.3.2蒸发器的设计计算...............