1、制冷系統(tǒng)設(shè)計(jì)參數(shù)查詢與指導(dǎo)L、T圖為液態(tài)制冷劑過冷與眼氣過熱圧焙團(tuán)I1、已知條件如下面例某空調(diào)制冷裝蚤使用R12為制冷劑,制冷量巧CkW,冷擬溫度巴曲匕,蒸發(fā)溫度令匸，過冷溫度t4u麗匸，吸氣溫度川=門匸，試完成該工況下制冷循環(huán)的熟計(jì)阜。：、確走狀態(tài)點(diǎn)，找出蒸發(fā)壓力與冷凝壓力線。同時(shí)具有過冷過熱的循環(huán)如上團(tuán)中1：-丫丿：彳一1,根堀杓和tl在R.I2熱力性質(zhì)表上查出P3=).96MPa絕對(duì)壓力PIM).34MP【絕對(duì)壓尢1根據(jù)壓熔圖可知P2-j4-?3Pl：=p5-=rL-、由Z和L的交點(diǎn)確定i由I：沿等慵線向右上方延俾，與的交點(diǎn)為點(diǎn)2：;t4：與衛(wèi)的交點(diǎn)為-】點(diǎn).*垂直向下與E的交點(diǎn)為寧。仏

2、確定狀態(tài)參數(shù)根據(jù)已經(jīng)確定的各狀態(tài)位気在R匚壓焙圖上找到各點(diǎn)焙值，分別対hl:=36lkj/kgli2:=580kj/kgh-:=hji:=2.34kj/kgg熱力計(jì)算單位工質(zhì)制冷量為q2=hlJ-h51-234=127lj/kg單位工質(zhì)放熱量為ql=h-h_：=3加-d-=l曲kj/kg壓縮機(jī)消耗的凈功為w=h2:-hl=38()-361=IQkj/kg制冷利質(zhì)為qm=p/q2=5()/l27=0.394炬/s冷負(fù)荷為c=qm(h2?-h4?)=()394(38(K234i=57.524kj/s制冷系數(shù)為c=q2/w=l27/19=6.68壓縮機(jī)總消耗功量為P=qmih2Mi)=(l.394*

3、l9=7486kw人在既不過冷也不過熱時(shí)的計(jì)算與上述計(jì)算類似，這時(shí)的循環(huán)按I-2-4-5.1進(jìn)行，各狀態(tài)點(diǎn)及參數(shù)均不難確定i/yjK以下是各夢(mèng)救査找說明，(軟件fSolkanc)已知冷譙溫夏t3=4jficeXE*oxgtB倫2C*4in&17925W/環(huán)“力出龍遊曠$；性社豪芳.iaamw（Fxwk寸（h）|0rctp)已知詩換溫度40匸則對(duì)應(yīng)的拎匾壓力p3=().96MPa已知烝友溫康t)=3X2則對(duì)應(yīng)的惑友壓力p)=().34MPa打開軟件界面如下：1R.AZw.9XZ1R.AZw.9XZ本軟件在使用時(shí)需要進(jìn)行設(shè)定1、茅一步是改變?cè)镒鞯姆?hào)設(shè)定.下面把符號(hào)修改為容易謨IfiB常用符號(hào)Op

4、tionsLnitSelectUnitsTemperatuieKPressuieMPaJVolumem?Mss/Molekg;kmoi尬硼kJSoundSpeedm/sJViscoskj?叫$TbmalConductiviymW/m-KScifaceTemionPressuremN/mJDimensonUnts)0.101325teselUmts_1PgpediesCMolarBatisSIwithCel沁M(jìn)oterSI磁$ComposilionMassBssjsCMohrBa$i$cg$1_1Mixedoncd|EnglishUnitlessL廠U$eGageFresure(BrocUicP

5、ressureOEfcvathn接下來是況體設(shè)足，把徐休改憑為後媒各矣Snlxtancc_SpecifyfluidctSpecifyFluidSet點(diǎn)擊此處改芟為國標(biāo)符號(hào)Chooseflud$etAllfluidsCorjjmonFluidsRefiigei3r*$NMuralGasFluidsCryogensCalibrationFluidsGERGandAGAgFluid選醫(yī)拎嫄液體第三個(gè)單選按鈕好文檔.讓好朋友也看Jix本軟件在便用時(shí)需要迸行設(shè)罡1、第一步是改變攧作的符號(hào)設(shè)走，下面把符號(hào)修改為容勒讀懂的常用符號(hào)OptionsUnits播下來是流偉設(shè)罡.把流體改:戲?yàn)槔涿礁鲏鳶ubstan

6、ceSpecifyfluidset0SpecifyFluidSetCheesefluidsetAlllluidsCcfnmcnFluid$RefrigerantsNaluialGa?FUd&C(5fogen$CaibidionFluidsGERGandAGA8FluidsCancelAddNeiwSetRename選圣冷媒液體弟三個(gè)單迓按鈕好文檔.讓好馭也看到XhEditSetfieJeteSet在下圖中遠(yuǎn)擇想更的詒無然后點(diǎn)擊OK損毎荻件便運(yùn)行在本痕體的撰作上面，之后便可對(duì)本幀體進(jìn)行數(shù)抿計(jì)算弓査找luisrancefluidinrormationRli-CCI2F2dicRiwodifluor

7、omethane(CAS#75-71-8)Molarmass|120.91kg/kmolTriplepttemp1161KNormalboclngpt2434K&GephasedipoleatNBPI0.51debyeCriticalPointTemperature385.12KDensityPressure4.136MPa|565.0kg/m?Acertffcfactor017948Ranosofappfability116.1KMinimumtemp.Maximumtemp.MaxrnumpressureMaximumdendiy5250K|200.0MPa|1829.4kg/m?NI$T

8、Rec:FEQHelmho吃equationofslateforR12ofMarx8laH19$2lLITERATUREREFERENCEMarx.V,Piuss.A.andWgnei.W,MNeueZuslandtgleichungenfuerR12ZR22,R11undR113BeschreibungdestheimodynamishchenZustandsverhaltenbeiTemperaturenbis525KundDrueckenbis3)0MPa,Duesseldofl,VDIVeilag,Seties19(V/aermetechnikKaeltetechnikNo5乙1992

9、EquationofStateViscosityIhermalConduclrvitySurfacetensionMellingLineSubSmalionLineTheinceflainliesindensityare02belovlhecriticdpointlemperatureand|Copy緲QKPjinl下面就可以査找憩吏的數(shù)據(jù)了CalculateSaturationtabicSpecifySaturationTableGVeporlquidsati/ataDn廣Sdidu：dsluraliDn(Mdlhgline)Sdi-vapofsatuiaiion(SuUraatonline

10、)VaiyTerrpefatufeCPrecoiieCQu&ilyalfixedICQuityalfixedp選擇逞度時(shí)inputPropertyRangeInitialTemperature12O.OKFinalTemperature3300KIncfejaenl50K廠Leaveaclwe廠AddtocucenttableOKCancel選擇壓力時(shí)選擇溫度持性時(shí)InputPropertyRange廠AddtocurrenttableQKdncd選擇壓力特性時(shí)InputPropertyRange廠AddtocunenttableOKICancelI/V-J則對(duì)應(yīng)的莖發(fā)壓力pl=O.34MPa

11、對(duì)應(yīng)的飽和壓力是0.95S82MPa己知冷凝盅度(3=40X2則對(duì)應(yīng)的冷漣壓力p3=0.96MPa已知烝友溫度HbC當(dāng)冷凝溫度為4()度時(shí)，口回岡Temperature(C)Pressure(MPa)LiquidDensity(k如3)VaporDensity(kg/m3)LiquidEnthalpy(kJ/kg)VaporEnthalpy(kJ/kg)LiquidEntropy(kJ/kg-K)VaporEntropy(kJ/kg-K)1360000.867911269.949.152235.12367541.11921.547G237.0000890021266.150.426236.14

12、367901.12251.5473338.0000912531262.251.727237.16368.261.12571.54704390000935471258253.057238.19368611.12891.54685400000958821254354416239.22368961.13221.5465叵當(dāng)菱發(fā)溫度為3度時(shí).對(duì)應(yīng)的飽和壓力是0.33968MPaTemperaturePressure(MPa)LiquidDensity(kg/m：)VaporDensity(kg/nnV)LiquidEnthalpy(kJ/kg)VaporEnthalpy(kJ/kg)LiquidEntropy(kJ/kg-K)VaporEntropy(kJ/kg-K)1300000339681386.419.611202.82354131.01021.55812400000.350711383.120219203.76354571.013G1.55773500000362011379.820.84220471355011.01691.55734600000.