Condensation Calculation.xls

Highest RHProject No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - Highest Relative HumidityChecked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resistivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.300.185.00Exterior CladdingPlaster0.024.0050.00Outside Air0.06The calculation is based on inside conditions of 24C and 50%rhand outside conditions of 16C and 81%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding=1.92E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resisitivity x Thickness)+Air Gap+Ventilated Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air=5.33(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1492.6-1473)/1.92E+10Gt=1.02E-09Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 24 C & 50% rhPvo is the outside vapour pressure @ 16C and 81%rhGt is the total vapour resistence (N s/kg)q=tai-tao=(24-16)/5.33Rt=1.50W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=23.820052587Pv2=149029851495No Cond.t2=23.3514395322Pv3=148929851496No Cond.t3=22.0360344663Pv4=148426451161No Cond.t4=21.7661133468Pv5=148126451164No Cond.t5**=16.5952106738pv6=14761938462No Cond.t6**=16.4798597681pv7=14741938464No Cond.t7**=16.2099386485pv8=14731818345No Cond.Outside Dew Point 12.7 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.** Although the result is positivepressure difference,the difference is very low which indicates a riskof condensation .

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Highest DPProject No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - Highest Dew Point TemperatureChecked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.300.185.00Exterior CladdingPlaster0.024.0050.00Outside Air0.06The calculation is based on inside conditions of 24C and 50%rhand outside conditions of 30.5C and 70%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding=1.92E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resisitivity x Thickness)+Air Gap+Ventilated Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air=5.33(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1492.6-2972)/1.92E+10Gt=-7.71E-08Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 24C and 50%rhPvo is the outside vapour pressure @ 30.5C and 70%rhGt is the total vapour resistence (N s/kg)q=tai-tao=(24-30.5)/5.33Rt=-1.22W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=24.1462072731Pv2=168629851299No Cond.t2=24.5269553801Pv3=176331691406No Cond.t3=25.5957219961Pv4=214833631215No Cond.t4=25.8150329057Pv5=23793363984No Cond.t5=30.0163913275pv6=278042461466No Cond.t6=30.1101139385pv7=289542461351No Cond.t7=30.3294248481pv8=297242461274No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


Highest DBProject No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - Highest Dry Bulb TemperatureChecked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivity &Thermal Conductivity is assumed to be similar to:Assumed Thickness mThermal Resistivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.300.185.00Exterior CladdingPlaster0.024.0050.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 46C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding=1.92E+10(N s/kg)where Gt is the total vapour resistance (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air=5.33(N s/kg)where Rt is the total thermal resistance of the structuremv=Pvi-Pvo=(1322-2928.3)/1.92E+10Gt=-8.37E-08Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 46C and 29%rhGt is the total vapour resistance (N s/kg)q=tai-tao=22-46/5.33Rt=-4.50W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistance of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=22.5398422391Pv2=153128101279No Cond.t2=23.9456814033Pv3=161529851370No Cond.t3=27.891896601Pv4=203337821749No Cond.t4=28.7016599596Pv5=228440081724No Cond.t5=44.2143679785pv6=271991106391No Cond.t6=44.5604206958pv7=284595936748No Cond.t7=45.3701840544pv8=292895936665No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


80C & .1ins.Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - 80C (0.1insulation)Checked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resisitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.300.185.00Exterior CladdingPlaster0.024.0050.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 80C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding=1.92E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air=5.33(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1322-13749)/1.92E+10Gt=-6.47E-07Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 80C and 29%rhGt is the total vapour resistence (N s/kg)q=tai-tao=22-80/5.33Rt=-10.9W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=23.3046187444Pv2=29402810-130Cond.t2=26.7020633912Pv3=35873567-20Cond.t3=36.2387501192Pv4=68245947-877Cond.t4=38.1956782358Pv5=87656632-2133Cond.t5=75.6847226147pv6=121314023628105No Cond.t6=76.5210166816pv7=131024193828836No Cond.t7=78.4779447982pv8=137494552431775No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


80C & .15ins. Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - 80C (0.15insulation)Checked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resisitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1534.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.300.185.00Exterior CladdingPlaster0.024.0050.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 80C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding=2.07E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air=7.06(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1322-13749)/2.07E+10Gt=-6.00E-07Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 80C and 29%rhGt is the total vapour resistence (N s/kg)q=tai-tao=22-80/7.06Rt=-8.2W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=22.9859711809Pv2=28232810-13Cond.t2=25.5536044647Pv3=34233363-60Cond.t3=32.7609961383Pv4=64255034-1391Cond.t4=34.2399529097Pv5=91265323-3803Cond.t5=76.7387107092pv6=122484193829690No Cond.t6=77.3707435175pv7=131494193828789No Cond.t7=78.8497002889pv8=137494552431775No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


80C & .2ins. )Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - 80C (0.2insulation)Checked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resisitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.2034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.300.185.00Exterior CladdingPlaster0.024.0050.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 80C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding=2.22E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air=8.78(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1322-13749)/2.22E+10Gt=-5.60E-07Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 80C and 29%rhGt is the total vapour resistence (N s/kg)q=tai-tao=22-80/8.78Rt=-6.6W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=22.7924248029Pv2=2721281089No Cond.t2=24.8560310606Pv3=32813169-112Cond.t3=30.6486100294Pv4=60804496-1584Cond.t4=31.8372472338Pv5=94394759-4680Cond.t5=77.3789025749pv6=123504193829588No Cond.t6=77.8868671922pv7=131894370030511No Cond.t7=79.0755043966pv8=137494552431775No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


70C & .1ins. Vent.Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - 70C (0.1insulation) (Ventilation Effect)Checked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resisitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.000.000.00Exterior CladdingPlaster0.000.000.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 70C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier=1.67E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Outside Air=5.07(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1322-9047)/1.67E+10Gt=-4.63E-07Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 70C and 29%rhGt is the total vapour resistence (N s/kg)q=tai-tao=22-70/5.07Rt=-9.5W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=23.1349995407Pv2=24782810332No Cond.t2=26.0907275113Pv3=29413363422No Cond.t3=34.3875077797Pv4=5254532470No Cond.t4=36.0900070907Pv5=66425947-695Cond.t5=68.7049364215pv6=90472987320826No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


70C & .15ins. Vent. Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCondensation Calculation - 70C (0.15insulation) (Ventilation Effect)Checked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resisitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1534.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.000.000.00Exterior CladdingPlaster0.000.000.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 70C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier=1.82E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Outside Air=6.80(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1322-9047)/1.82E+10Gt=-4.24E-07Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 70C and 29%rhGt is the total vapour resistence (N s/kg)q=tai-tao=22-70/6.8Rt=-7.1W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=22.8471796896Pv2=23832810427No Cond.t2=25.0533767979Pv3=28083169361No Cond.t3=31.2462107862Pv4=49304496-434Cond.t4=32.5169803206Pv5=68405034-1806Cond.t5=69.0333462516pv6=90472987320826No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


60C & .1ins. Vent. Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectCritical Condensation Calculation - 60C (0.1insulation) (Ventilation Effect)Checked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKDataLayerVaopur Resistivety &Thermal Conductivety is assumed to be similar to:Assumed Thickness mThermal Resisitivity km/WVapour Resistivity GNs/Kg mInside Air0.12Interior PanelsPlaster Board0.056.2550.00Sound InsulationIns. Fiberboard0.0517.5420.00Air Gap (1)1.000.185.00Rigid Insulation0.1034.4830.00Vapour BarrierHardboard0.017.69520.00Ventilated Air Gap0.000.000.00Exterior CladdingPlaster0.000.000.00Outside Air0.06The calculation is based on inside conditions of 22C and 50%rhand outside conditions of 60C and 29%rhCalculation of Heat Flow Rate and Vapour Mass Transfer RateGt=(Vapour Resistivity x Thickness)Gt=Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier=1.67E+10(N s/kg)where Gt is the total vapour resistence (N s/kg)Rt=Inside Air +(Thermal Resistivity x Thickness)+Air Gap+Outside AirRt=Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +Vapour Barrier + Outside Air=5.07(N s/kg)where Rt is the total thermal resistence of the structuremv=Pvi-Pvo=(1322-5784)/1.67E+10Gt=-2.67E-07Kg/m2swhere mv is the rate of vapour mass transfer per unit areaPvi is the inside vapour pressure @ 22C and 50%rhPvo is the outside vapour pressure @ 70C and 29%rhGt is the total vapour resistence (N s/kg)q=tai-tao=22-60/5.07Rt=-7.5W/m2where q is the rate of flow of heat per unit areatai is the inside air temp.tao is the outside air temp.Rt is the total thermal resistence of the structureCalculation of Temperature And Vapour Pressure at Each LayerTemperature (C)Vapour Pressure(calculated) Pa pv2= pv1-mvG1Saturated Vapour Pressure(Pa) From Saturated Water TablesDifference PaResult*t1=tai-qRsit1=22.8985413031Pv2=19902810820No Cond.t2=25.2384926131Pv3=22573169912No Cond.t3=31.8067769922Pv4=359347591166No Cond.t4=33.1545889468Pv5=43955034639No Cond.t5=58.9747413337pv6=57841903913255No Cond.Outside Dew Point 24 C* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.


60C & .1ins. Vent. Air Req (2)Project No.DateDESIGN CALCULATIOND005213-Jul-14Mechanical & Industrial DepartmentSHEETSheet No.Computed byC A I R O - E G Y P T1 of 2MGSubjectVentilation Air Required - Not To Exceed 60CChecked byApproved byBuildingConcourse 2 - Dubai International AirportTZMKHeat Gain To The Ventilated Air Gap:Q = U A TWhereQ is the heat gain to the ventilated air gap in WU is the overall heat transfer coeffient in W/m2kA is the area in m2T is the temperature difference in KelvinQ = (3.85)(6.25)(353.15-333.15)481W=1642.615BTU/hrVentilation air required:Q = cfm(1.08)TWhereQ is the heat gain to the ventilated air gap in BTU/hrcfm is the required ventilation airT is the temperature difference in Fahrenheit1648.615 = cfm(1.08)(176-140)cfm =42=20l/s=30l/s(For Safety)Therefore ventilation air requird is 5 l/s for each 1 m2Area through which air flow = 4*2.5*0.03/2= 0.15 /2 = 0.075 m2For air to enterVelocity =0.03/.075=0.4 m/s=80 ft/min


Condensation Calculation.xls

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