safety valve blowback calculation(optimization2)

of 16 /16
document.xls Vent pipe calculation Page 1 of 16 Project: 1 X 43 MW Coal Based Plant for Welspun System: Blow-back Calculations Tag: For validation PSV 415+425 PSV 351+451 Code As per ANSI B31.1-2001 / clause II-2.0 1 no 1 no 1 no 1 nos Sr No Symbol Parameter Unit Value Value Value Value Value Input Data Steam Data Kg/cm2(g) 64.00 18.80 18.80 13.06 8.96 Steam Quality S S S S S Steam Mass flow rate tph 190.04 139.34 139.34 96.91 13.55 Steam Pressure @ S/V Inlet bar(a) 63.74 19.42 19.42 13.79 9.77 Steam Temperature @ S/V Inlet C 537.80 317.50 317.50 317.50 317.50 Steam Pressure @ S/V Inlet psia 925.01 282.10 282.10 200.50 142.14 Steam Temperature @ S/V Inlet F 1000.04 603.50 603.50 603.50 603.50 Enthalpy at S/V inlet kJ/kg #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! Silencer back pressure ( From Silencer Vendor) Kg/cm2(g) 0.02 0.00 0.00 0.00 0.00 Pa Atmospheric pressure ( At discharge environment ) psia 14.98 14.70 14.70 14.70 14.70 D Discharge Elbow Size, NB mm 200.00 300.00 300.00 300.00 150.00 Thickness of elbow mm 8.18 9.50 9.50 9.50 7.10 Pipe OD mm 219.10 323.90 323.90 323.90 168.30 Pipe ID in 12.00 12.00 12.00 6.07 W Steam Mass flow rate lbm/s 116.38 85.33 85.33 59.35 8.30 Discharge elbow area 50.00 113.20 113.20 113.20 28.90 a Factor Btu/lbm 823.00 823.00 823.00 831.00 831.00 b Factor 4.33 4.33 4.33 4.33 4.33 ho Enthalpy @ S/V inlet Btu/lbm #VALUE! #VALUE! #VALUE! #VALUE! #VALUE! J ft-lbf/Btu 778.16 778.16 778.16 778.16 778.16 gc Gravitational constant 32.20 32.20 32.20 32.20 32.20 Installation data For Vent pipe Vent pipe diameter, NB mm 300.00 550.00 400.00 400.00 200.00 Thickness of vent pipe mm 8.38 9.53 9.53 9.53 8.18 Pipe OD mm 323.90 558.80 406.40 406.40 219.10 Vent pipe area 114.80 354.60 182.60 182.60 50.00 ID in 21.25 15.25 15.25 7.98 Calculations ASME test case Main Steam Header to 18 ata header Main Steam Header to 18 ata header 18 ata header to 13 ata header 18 ata header to 9 ata header PSV- 315A+315b+ 331 A+ 331B PSV 350A+ 350 b +450a +450 b A1 in 2 lbm-ft/lbf-s 2 A3 in 2

Author: durjoy-chakraborty

Post on 18-Dec-2015

205 views

Category:

Documents


23 download

Embed Size (px)

DESCRIPTION

Safety Valve

TRANSCRIPT

Vent pipe calculationProject:1 X 43 MW Coal Based Plant for WelspunSystem:Blow-back CalculationsASME test caseMain Steam Header to 18 ata headerMain Steam Header to 18 ata headerMain Steam Header to 18 ata headerMain Steam Header to 18 ata headerMain Steam Header to 18 ata header18 ata header to 13 ata header18 ata header to 13 ata header18 ata header to 13 ata header18 ata header to 13 ata header18 ata header to 9 ata headerIP MSSVLP Drum(Lower)LP Drum(Upper)LP SHTag:For validationPSV-315A+315b+ 331 A+ 331BPSV-315BPSV-331A+331bPSV-331BPSV 415+425PSV 350A+ 350 b +450a +450 bPSV 350BPSV 450A+ 450 bPSV 450BPSV 351+4511-AVM-206F1-BVM-206F1-AVM-207FA1-BVM-207FA1-AVM-207FB1-BVM-207FB1-AVM-208F1-BVM-208FCodeAs per ANSI B31.1-2001 / clause II-2.01 no1 no1 no1 no1 no1 nosSr NoSymbolParameterUnitValueValueValueValueValueValueValueValueValueValueValueValueValueValueValueRemarksInput DataSteam DataKg/cm2(g)64.0018.8017.8218.8017.8218.8013.0612.4113.0612.418.9623.908.679.0026.50Steam QualitySSSSSSSSSSSSSSSSSSSSteam Mass flow ratetph190.04139.3476.18139.3476.18139.3496.917.1796.917.1713.5511.4010.5810.964.30SSteam Pressure @ S/V Inletbar(a)63.7419.4218.4619.4218.4619.4213.7913.1513.7913.159.7724.439.509.826.10Steam Temperature @ S/V InletC537.80317.50317.50317.50317.50317.50317.50317.50317.50317.50317.50319.00157.20157.20265.70Steam Pressure @ S/V Inletpsia925.01282.10268.16282.10268.16282.10200.50191.21200.50191.21142.14354.64138.02142.71391.62Steam Temperature @ S/V InletF1000.04603.50603.50603.50603.50603.50603.50603.50603.50603.50603.50606.20314.96314.96510.268088.9Enthalpy at S/V inletkJ/kg3506.113063.983066.523063.983066.523063.983078.603080.233078.603080.233088.700.000.000.000.00100114.3Silencer back pressure ( From Silencer Vendor)Kg/cm2(g)0.020.000.000.000.000.000.000.000.000.000.001.200.450.500.30PaAtmospheric pressure ( At discharge environment )psia14.9814.7014.7014.7014.7014.7014.7014.7014.7014.7014.7031.7721.1021.8118.97DDischarge Elbow Size, NBmm200.00300.00250.00300.00250.00300.00300.00100.00300.00100.00150.0080.00150.00150.00100.00150168.3Thickness of elbowmm8.189.508.709.508.709.509.506.409.506.407.107.807.117.116.02200219.1Pipe ODmm219.10323.90273.10323.90273.10323.90323.90114.30323.90114.30168.3088.90168.30168.30114.30250273.1Pipe IDin12.0010.0712.0010.0712.0012.004.0012.004.006.07300323.9WSteam Mass flow ratelbm/s116.3885.3346.6585.3346.6585.3359.354.3959.354.398.306.986.486.712.63350355.6A1Discharge elbow areain250.00113.2079.60113.2079.60113.20113.2012.50113.2012.5028.906.5028.9028.9012.70400406.4aFactorBtu/lbm823.00823.00823.00823.00823.00823.00831.00831.00831.00831.00831.00823.00823.00823.00823.00Table II-2.2.1bFactor4.334.334.334.334.334.334.334.334.334.334.334.334.334.334.33Table II-2.2.1hoEnthalpy @ S/V inletBtu/lbm1507.41317.271318.371317.271318.371317.271323.561324.261323.561324.261327.900.000.000.000.00abJft-lbf/Btu778.16778.16778.16778.16778.16778.16778.16778.16778.16778.16778.16778.16778.16778.16778.1629111gcGravitational constantlbm-ft/lbf-s232.2032.2032.2032.2032.2032.2032.2032.2032.2032.2032.2032.2032.2032.2032.208234.338314.33Installation dataLC/L distance of S/V and Ventmm750.00750.00750.00750.00750.00750.00750.00750.00750.00750.00750.00750.00750.00750.00750.00For Vent pipeVent pipe diameter, NBmm300.00550.00300.00550.00300.00400.00400.00150.00400.00150.00200.00250.00200.00200.00150.00Thickness of vent pipemm8.389.539.539.539.539.539.537.119.537.118.189.278.188.187.11Pipe ODmm323.90558.80323.80558.80323.80406.40406.40168.30406.40168.30219.10273.10219.10219.10168.30A3Vent pipe areain2114.80354.60113.10354.60113.10182.60182.6028.90182.6028.9050.0078.9050.0050.0028.90ID in21.2512.0021.2512.0015.2515.256.0715.256.077.98CalculationsAPressure & Velocity for Discharge Elbow1P1Pressure @ Discharge Elbow outletFig. II-2-1psia117.6332.3825.2032.3825.2032.3822.4815.0622.4815.0612.370.000.000.000.002V1Velocity @ discharge elbowft/s2115.941798.241800.221798.241800.221798.241795.121796.391795.121796.391803.010.000.000.000.003S/V Outlet Pressure, "P1a" at inlet to discharge belowFig.II-2-13.1LC/L distance of S/V and VentL/DDisch pipe Length to dia ratioL/D for weld neck flange0.500.370.400.370.400.370.370.750.370.750.560.500.500.500.50Constant value used as layout is not knownL/D short radius elbow30.0030.0030.0030.0030.0030.0030.0030.0030.0030.0030.0024.0024.0021.007.00Ref: Crane' s handbook page A-29L/D for pipe1.500.561.000.561.000.790.791.980.791.981.502.662.663.386.71Total Lmax / D32.0030.9431.4030.9431.4031.1631.1632.7331.1632.7332.0727.1627.1624.8814.213.2fDarcy-Weisbach friction factor0.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.010.010.010.013.3kSpecific Heat ratio1.301.301.3001.301.3001.301.301.301.301.301.301.301.301.301.303.4f(L/D)0.420.400.410.400.410.410.410.430.410.430.420.350.350.320.183.5P/P*Read from CHART II-1, enter with value of fL/D1.651.651.651.651.651.651.651.661.651.661.651.611.611.501.34From Chart II-13.6P1aPressure at inlet of elbow or SRV outlet= P1 (P/P*) , Max pressure for the elbow designpsia193.7353.4241.5853.4241.5853.4237.0925.0037.0925.0020.410.000.000.000.00Pressure drop between Safety valve outlet flange and Elbow outletpsi21.0416.3821.0416.3821.0414.619.9414.619.948.040.000.000.000.00BFor Vent Pipe1P3Maximum working Pressure at Vent Pipe outletpsia51.2317.6017.7417.6017.7420.0715.476.5115.476.517.150.000.000.000.00Length of pipein200200200200200200200200200200L/DDisch pipe Length to dia ratioL/D for pipe19.859.4116.679.4116.6713.1213.1232.9713.1232.9725.0651.651.662.262.2Total Lmax / D19.859.4116.679.4116.6713.1213.1232.9713.1232.9725.0651.6351.6362.1662.16fDarcy-Weisbach friction factor0.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.0130.013kSpecific Heat ratio1.31.301.301.301.301.301.301.301.301.301.301.31.31.31.3f(L/D)Total Lmax / D0.260.120.220.120.220.170.170.430.170.430.330.670.670.810.81P/P*1.5061.431.451.431.451.431.441.661.441.661.551.81.81.91.9P2Max operating pressure ar Vent pipepsia77.225.225.725.225.728.722.310.822.310.811.10.00.00.00.0P2 = P3 ( P/P*)2Check for Blow back from vent pipeV3Velocity at exit of vent pipeV3 = V12115.91798.21800.21798.21800.21798.21795.11796.41795.11796.41803.00.00.00.00.0f(L/D)Total Lmax / D0.2580.1220.2170.1220.2170.1700.1700.4290.1700.4290.3260.6710.6710.8080.808V/V*From chart II - 10.7120.740.730.740.730.740.730.660.730.660.680.580.580.5750.575V2V3 X ( V/V*)1506.61330.71314.21330.71314.21330.71310.41185.61310.41185.61226.00.00.00.00.0Checking for inequality from para II-2.3.1.2W X ( V1-V2) / gc220319167041916704123995983959831490000(P2-Pa) X A2 - ( P1 - Pa ) X A1200517134101713410556504-117504-117-1140000Condition to be satisfiedTRUETRUETRUETRUETRUETRUETRUETRUETRUETRUETRUE0000Please check the formulas below this line from the ASME code . This portion is not completed. Once it corrected the sheet will become complete.3Reaction Force at Discharge Elbow exit_downwardF1Reaction force at discharge elbow exit _Downward forcelbf12780676634446766344467664189249418924939700004Forces and Moment at vent pipe anchorOnly straight face vent pipe is consideredF2F2 = W X V2 + ( P2 - Pa) X A2 _ upward forcelbf12582724031507240315060833799493799491350000gcF3F3 = W X V3 + ( P3 - Pa) X A3 _ downward forcelbf11808.825794.902951.625794.902951.625746.203449.628.223449.628.2287.210.000.000.000.00gcNet imbalance on the vent pipe in upward directionlbf773.4861445.039198.4221445.039198.422336.887349.86841.021349.86841.02147.8620.0000.0000.0000.000

&L&F&C&A&RPage &P of &N30 ft vent stack of sch 30 considered30 ft vent stack of sch 30 considered30 ft vent stack of sch 30 considered30 ft vent stack of sch 30 considered30 ft vent stack of sch 30 considered30 ft vent stack of sch 30 considered50 ft vent stack 14" Consideredin absence of info 27 inch consideredin absence of info 27 inch consideredin absence of info 27 inch consideredin absence of info 27 inch consideredin absence of info 27 inch consideredin absence of info 27 inch consideredin absence of info 27 inch consideredin absence of info 27 inch consideredRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowSame as test case as no data is avaialableSame as test case as no data is avaialableSame as test case as no data is avaialableSame as test case as no data is avaialableSame as test case as no data is avaialableSame as test case as no data is avaialableSame as test case as no data is avaialableSame as test case as no data is avaialableSch 30 consideredSch 40 consideredSch 40 consideredSch 40 consideredSch 40 consideredSch 40 consideredSch 40 consideredSch 40 consideredSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steam50 ft vent stack 14" ConsideredSS= for saturated steam

S = for Superheated steamSch 40 consideredSame as test case as no data is avaialableRefe from cranes' shandbook A-29 for standard elbowin absence of info 27 inch considered50 ft vent stack 14" ConsideredRefe from cranes' shandbook A-29 for standard elbowSS= for saturated steam

S = for Superheated steamSch 40 consideredSame as test case as no data is avaialableRefe from cranes' shandbook A-29 for standard elbowin absence of info 27 inch considered30 ft vent stack of sch 30 consideredSS= for saturated steam

S = for Superheated steamSch 40 consideredSame as test case as no data is avaialableRefe from cranes' shandbook A-29 for standard elbowin absence of info 27 inch considered30 ft vent stack of sch 30 consideredSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSch 40 consideredSch 40 consideredSame as test case as no data is avaialableSame as test case as no data is avaialableRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowin absence of info 27 inch consideredin absence of info 27 inch considered50 ft vent stack 14" Considered50 ft vent stack 14" ConsideredSS= for saturated steam

S = for Superheated steamSS= for saturated steam

S = for Superheated steamSch 40 consideredSch 40 consideredSame as test case as no data is avaialableSame as test case as no data is avaialableRefe from cranes' shandbook A-29 for standard elbowRefe from cranes' shandbook A-29 for standard elbowin absence of info 27 inch consideredin absence of info 27 inch considered30 ft vent stack of sch 30 considered30 ft vent stack of sch 30 considered6578

Figures

PropertiesX Steam TablesExcel macros, IF-97 Steam tables.The excel scripts are stored inside this workbook. A complete list of functions for use is available on the "Calling functions" worksheetBy: Magnus HolmgrenThe steam tables are free and provided as is. We take no responsibilities for any errors in the code or damage thereby.www.x-eng.comOBS: This workbook uses macros. Set security options in Tools:Macro:Security to enable macros.Saturation properties given temperatureSaturation properties given pressureTemperature227.17CPressure28.060bar a1kg/cm2=0.980665barSaturation pressure26.547bar aSaturation temperature230.18C4.3kg/cm2=4.2168595barLiquidLiquid1.0204081633Enthalpy977.0kJ/kg233.39030611Enthalpy991.1kJ/kg236.7538422992Density830.89kg/m3Density826.88kg/m3Entropy2.58kJ/kgKEntropy2.61kJ/kgK152.96VapourVapour-37.7Vapour enthalpy2802.6kJ/kgVapour enthalpy2803.0kJ/kg669.6195756226Vapour density13.28kg/m3Vapour density14.03kg/m3Vapour Entropy6.23kJ/kgKvapour Entropy6.21kJ/kgKEvaporation energy1825.7kJ/kgEvaporation energy1812.0kJ/kg92992215.7190635452Properties given pressure and temperatureProperties given pressure and enthalpy2221.45246058298790.6Pressure37.44bar aPressure12.57bar aTemperature250.00CEnthalpy2788.00kJ/kgEnthalpy2815.5kJ/kgTemperature191.0C672.5917473576Density18.50kg/m3Density6.39kg/m3Entropy6.12kJ/kgKEntropy6.51kJ/kgKVapour fraction100%Vapour fraction100%IF97 Region2IF97 Region2PhaseSteamPhaseSteamHP HEATER2Isobaric heat capacity3.7198707386kJ/kgIsobaric heat capacity2.8194794225kJ/kgSpeed of sound507.0494563356m/sSpeed of sound503.5512171421m/sEXTRACTION PRESSURE7.2KG/CM2TTD0.00SAT.0.0029.20FW INLWT69.9FW OUTLET95.3FLOW495TPHDRAIN99.1137.5KG/SM3/SPIPE SIZE400NBOD406mm(m2/s2)/(m/s2)THICK36.5mmID333mmAREA0.0870920169m2VELOCITY0m/sV2/2G0mwsc0kg/m20kg/cm20gm/cm2Weight of particle50gmArea0.2cm2250gm/cm2

&C&A&CPage &Pwww.x-eng.com

FunctionsX Steam Tablesv2.6http://www.x-eng.comSteam tables by Magnus Holmgren according to IAPWS IF-97The excel scripts are stored inside this workbook. (No extra files are needed. Start from a copy of this workbook. This page can be removed)For error-reporting, feedback, other units etc. contact:[email protected] steam tables are free and provided as is. We take no responsibilities for any errors in the code or damage thereby.OBS: This workbook uses macros. Set security options in Tools:Macro:Security to enable macros.TemperatureTsat_p1bar99.6059186113CSaturation temperatureT_ph1bar100kJ/kg23.8448190753CTemperture as a function of pressure and enthalpyT_ps1bar1kJ/(kg K)73.7085942144CTemperture as a function of pressure and entropyT_hs100kJ/kg0.2kJ/(kg K)13.8493351119CTemperture as a function of enthalpy and entropyPressurepsat_T100C1.0141797792barSaturation pressurep_hs84kJ/kg0.296kJ/(kg K)2.2954982693barPressure as a function of h and s.p_hrho2000kJ/kg5kg/m36.0464690305barPressure as a function of h and rho (density). Very unaccurate for solid water region since it's almost incompressible!EnthalpyhV_p1bar2674.9496408322kJ/kgSaturated vapour enthalpyhL_p1bar417.4364858162kJ/kgSaturated liquid enthalpyhV_T100C2675.5720292208kJ/kgSaturated vapour enthalpyhL_T100C419.0991549977kJ/kgSaturated liquid enthalpyh_pT1bar20C84.0118111671kJ/kgEntalpy as a function of pressure and temperature.h_ps1bar1kJ/(kg K)308.6107170829kJ/kgEntalpy as a function of pressure and entropy.h_px1bar0.51546.1930633242kJ/kgEntalpy as a function of pressure and vapour fractionh_Tx100C0.51547.3355921093kJ/kgEntalpy as a function of temperature and vapour fractionh_prho1bar2kg/m31082.77339076kJ/kgEntalpy as a function of pressure and density. Observe for low temperatures (liquid) this equation has 2 solutions. (Not valid!!)Specific volumevV_p1bar1.6940225229m3/kgSaturated vapour volumevL_p1bar0.0010431478m3/kgSaturated liquid volumevV_T100C1.6718606011m3/kgSaturated vapour volumevL_T100C0.0010434555m3/kgSaturated liquid volumev_pT1bar100C1.6959594074m3/kgSpecific volume as a function of pressure and temperature.v_ph1bar1000kJ/kg0.4379256581m3/kgSpecific volume as a function of pressure and enthalpyv_ps1bar5kJ/(kg K)1.0346353902m3/kgSpecific volume as a function of pressure and entropy.DensityrhoV_p1bar0.5903109235kg/m3Saturated vapour densityrhoL_p1bar958.636889676kg/m3Saturated liquid densityrhoV_T100C0.5981359925kg/m3Saturated vapour densityrhoL_T100C958.3542772859kg/m3Saturated liquid densityrho_pT1bar100C0.5896367541kg/m3Density as a function of pressure and temperature.rho_ph1bar1000kJ/kg2.2834926007kg/m3Density as a function of pressure and enthalpyrho_ps1bar1kJ/(kg K)975.6236788482kg/m3Density as a function of pressure and entropy.Specific entropysV_p0.006117bar9.1554655557kJ/(kg K)Saturated vapour entropysL_p0.0061171bar0.000018359kJ/(kg K)Saturated liquid entropysV_T0.0001C9.1557567159kJ/(kg K)Saturated vapour entropysL_T100C1.3070143278kJ/(kg K)Saturated liquid entropys_pT1bar20C0.2964829208kJ/(kg K)Specific entropy as a function of pressure and temperature (Returns saturated vapour entalpy if mixture.)s_ph1bar84.0118111671kJ/kg0.2968138447kJ/(kg K)Specific entropy as a function of pressure and enthalpySpecific internal energyuV_p1bar2505.5473885419kJ/kgSaturated vapour internal energyuL_p1bar417.3321710323kJ/kgSaturated liquid internal energyuV_T100C2506.0153076916kJ/kgSaturated vapour internal energyuL_T100C418.9933298552kJ/kgSaturated liquid internal energyu_pT1bar100C2506.171426466kJ/kgSpecific internal energy as a function of pressure and temperature.u_ph1bar1000kJ/kg956.207434187kJ/kgSpecific internal energy as a function of pressure and enthalpyu_ps1bar1kJ/(kg K)308.5082185457kJ/kgSpecific internal energy as a function of pressure and entropy.Specific isobaric heat capacityCpV_p1bar2.0759380252kJ/(kgC)Saturated vapour heat capacityCpL_p1bar4.2161494308kJ/(kgC)Saturated liquid heat capacityCpV_T100C2.0774918685kJ/(kgC)Saturated vapour heat capacityCpL_T100C4.2166451189kJ/(kgC)Saturated liquid heat capacityCp_pT1bar100C2.0741085546kJ/(kgC)Specific isobaric heat capacity as a function of pressure and temperature.Cp_ph1bar200kJ/kg4.1791357317kJ/(kgC)Specific isobaric heat capacity as a function of pressure and enthalpyCp_ps1bar1kJ/(kg K)4.1906070379kJ/(kgC)Specific isobaric heat capacity as a function of pressure and entropy.Specific isochoric heat capacityCvV_p1bar1.5526969793kJ/(kgC)Saturated vapour isochoric heat capacityCvL_p1bar3.7696996827kJ/(kgC)Saturated liquid isochoric heat capacityCvV_T100C1.553698696kJ/(kgC)Saturated vapour isochoric heat capacityCvL_T100C3.7677002201kJ/(kgC)Saturated liquid isochoric heat capacityCv_pT1bar100C1.5513972495kJ/(kgC)Specific isochoric heat capacity as a function of pressure and temperature.Cv_ph1bar200kJ/kg4.0351763636kJ/(kgC)Specific isochoric heat capacity as a function of pressure and enthalpyCv_ps1bar1kJ/(kg K)3.9029194681kJ/(kgC)Specific isochoric heat capacity as a function of pressure and entropy.Speed of soundwV_p1bar472.054157106m/sSaturated vapour speed of soundwL_p1bar1545.451947534m/sSaturated liquid speed of soundwV_T100C472.2559492389m/sSaturated vapour speed of soundwL_T100C1545.0922491939m/sSaturated liquid speed of soundw_pT1bar100C472.3375235249m/sSpeed of sound as a function of pressure and temperature.w_ph1bar200kJ/kg1542.6824750115m/sSpeed of sound as a function of pressure and enthalpyw_ps1bar1kJ/(kg K)1557.8585355322m/sSpeed of sound as a function of pressure and entropy.Dynamic ViscosityViscosity is not part of IAPWS Steam IF97. Equations from "Revised Release on the IAPWS Formulation 1985 for the Viscosity of Ordinary Water Substance", 2003 are used.Viscosity in the mixed region (4) is interpolated according to the density. This is not true since it will be two fases.my_pT1bar100C0.0000122704Pa sViscosity as a function of pressure and temperature.my_ph1bar100kJ/kg9.1400E-04Pa sViscosity as a function of pressure and enthalpymy_ps1bar1kJ/(kg K)3.8422E-04Pa sViscosity as a function of pressure and entropy.PrandtlCalcualted as Cp*my/tcpr_pT1bar200C9.5781E-01-pr_ph1bar2875.4750649489kJ/kg9.5781E-01-Thermal ConductivityRevised release on the IAPS Formulation 1985 for the Thermal Conductivity of ordinary water substance (IAPWS 1998)tcL_p100bar0.5245401946W/(m K)Saturated vapour thermal conductivitytcV_p1bar0.0247536676W/(m K)Saturated liquid thermal conductivitytcL_T100C0.6777575116W/(m K)Saturated vapour thermal conductivitytcV_T100C0.0247938714W/(m K)Saturated liquid thermal conductivitytc_pT100bar350C0.0685453038W/(m K)Thermal conductivity as a function of pressure and temperature.tc_ph1bar350kJ/(kg K)0.6692963322W/(m K)Thermal conductivity as a function of pressure and enthalpytc_hs100kJ/(kg K)0.34kJ/(kg K)0.6062831238W/(m K)Thermal conductivity as a function of enthalpy and entropySurface TensionIAPWS Release on Surface Tension of Ordinary Water Substance, September 1994st_T100C0.0755076616N/mSurface tension for two phase water/steam as a function of Tst_p1bar0.0589877842N/mSurface tension for two phase water/steam as a function of TVapour fractionx_ph1bar1000kJ/kg0.2580554239Vapour fraction as a function of pressure and enthalpyx_ps1bar4kJ/(kg K)0.4453979607Vapour fraction as a function of pressure and entropy.Vapour Volume FractionObserve that vapour volume fraction is very sensitive. Vapour volume is about 1000 times greater than liquid volume and therfore vapour volume fractiongets close to the accurancy of steam IF-97vx_ph1bar418kJ/kg0.2885Vapour volume fraction as a function of pressure and enthalpyvx_ps1bar4kJ/(kg K)0.9992Vapour volume fraction as a function of pressure and entropy.Version historyNews in V2.6* Error in valid region for function tc_ptrho* Error in function h3_pt for temperatures near the saturation point.News in V2.5* DLL distrubution for use in other applications* Freebasic translation* Fixed small error in Cv Region 5 p>1000barNews in V2.4a* ToSIUnit for h_ps region 4. (No effect in SI unit version).News in V2.4* Functions by p,rho inplemented in matlab also.* Many missing ; in matlab causing printouts detected.* OpenOffice version introduced. (Fixed calculation differences in open office and excel)* Matlab error giving varaible undefined in some backwards solutions fixed.News in V2.3* Option Explicit, gives more efficient calculations.* Extensive testing* my_ph not defined in region 4.* Problems at region border for h4V_p to adress solver problems at the exact border.* Problem at fast border check in region_ph fixed.News in V2.2* Extensive testing* Fixed error in Cp_ph* Function p_hrho added. (Very good for calcualting pressure when heating a volume with water/steam mixture.)* Fixed error in T_hs return no value for vet region bellow the water saturation line.* Prandtl number addedNews in V2.1* Calling function h_prho* Fixed problem with Cv reporting NaN in region 5.* Equivivalent to the Matlab version. (Downloadable from www.x-eng.com)News in V2* Calling functions of h and s added.* Thermal conductivity, Surface tension added* Calling functions h_px and h_tx added.* Cp, Cv and w undefined in the mixed region. (Before interpolation with the vapor fraction was used.)* A work sheet "Properties" for simple lookups added.

http://[email protected]