Condensation Calculation
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Proj. No. :D0052 1 of 12 Project No. DESIGN CALCULATION D0052 Mechanical & Industrial Department SHEET Sheet No. C A I R O - E G Y P T 1 of 2 SubjectCondensation Calculation - Highest Dry Bulb Temperatur Checked by BuildinConcourse 2 - Dubai International Airport TZ Data Layer Inside Air 0.12 Interior Panels Plaster Board 0.05 0.16 50. Sound Insulation Ins. Fiberboard 0.05 0.06 20. Air Gap (1) 1.00 0.18 5. Rigid Insulation 0.10 0.03 30. Vapour Barrier Hardboard 0.01 0.13 520 Ventilated Air Gap 0.30 0.18 5. Exterior Cladding Plaster 0.02 0.25 50. Outside Air 0.06 The calculation is based on inside conditions of 22C and 50%rh and outside conditions of 46C Calculation of Heat Flow Rate and Vapour Mass Transfer Rate = Σ(Vapour Resistivity x Thickness) = Interior Panels + Sound Insulation + Air Gap + Rigid Insul Vapour Barrier + Ventilated Air Gap + Exterior Cladding = 1.92E+10 (N s/kg) = Inside Air +Σ(Thermal Conductivity x Thickness)+Air Gap+Ve = Inside Air + Interior Panels + Sound Insulation + Air Gap Vapour Barrier + Ventilated Air Gap + Exterior Cladding + = 0.56 (N s/kg) = Pvi-Pvo = (1322-2928.3)/1.92E+10 = -8.37E-08 Vaopur Resistivety &Thermal Conductivety is assumed to be similar to: Assumed Thickness m Thermal Conductivity W/mk Vap Resist GNs/ Gt Gt where Gt is the total vapour resistence (N s/kg) Rt Rt where Rt is the total thermal resistence of the structure mv Gt Kg/m 2 s
Transcript of Condensation Calculation
Proj. No. :D0052
1 of 12
Project No. DateDESIGN CALCULATION D0052 21-Apr-23
Mechanical & Industrial Department SHEET Sheet No. Computed byC A I R O - E G Y P T 1 of 2 MG
Subject Condensation Calculation - Highest Dry Bulb Temperature Checked by Approved byBuilding Concourse 2 - Dubai International Airport TZ
Data
Layer
Inside Air 0.12
Interior Panels Plaster Board 0.05 0.16 50.00
Sound Insulation Ins. Fiberboard 0.05 0.06 20.00Air Gap (1) 1.00 0.18 5.00
Rigid Insulation 0.10 0.03 30.00Vapour Barrier Hardboard 0.01 0.13 520.00Ventilated Air Gap 0.30 0.18 5.00Exterior Cladding Plaster 0.02 0.25 50.00Outside Air 0.06
The calculation is based on inside conditions of 22C and 50%rh
and outside conditions of 46C and 29%rh
Calculation of Heat Flow Rate and Vapour Mass Transfer Rate
= Σ(Vapour Resistivity x Thickness)
= Interior Panels + Sound Insulation + Air Gap + Rigid Insulation + Vapour Barrier + Ventilated Air Gap + Exterior Cladding
= 1.92E+10 (N s/kg)
= Inside Air +Σ(Thermal Conductivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +
Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air
= 0.56 (N s/kg)
= Pvi-Pvo = (1322-2928.3)/1.92E+10
= -8.37E-08
Vaopur Resistivety &Thermal
Conductivety is assumed to be
similar to:
Assumed Thickness
m
Thermal Conductivity W/mk
Vapour Resistivity GNs/Kg m
Gt
Gt
where Gt is the total vapour resistence (N s/kg)
Rt
Rt
where Rt is the total thermal resistence of the structure
mv
Gt
Kg/m2s
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Project No. DateDESIGN CALCULATION D0052 21-Apr-23
Mechanical & Industrial Department SHEET Sheet No. Computed byC A I R O - E G Y P T 1 of 2 MG
Subject Condensation Calculation - Highest Dry Bulb Temperature Checked by Approved byBuilding Concourse 2 - Dubai International Airport TZ
Pvi is the inside vapour pressure @ 22C and 50%rh Pvo is the outside vapour pressure @ 46C and 29%rh
q = tai-tao = 22-46/0.56
= -42.85where q is the rate of flow of heat per unit area tai is the inside air temp. tao is the outside air temp.
Calculation of Temperature And Vapour Pressure at Each Layer
Temperature (C) Result*
t1 = 29.14 Pv2 = 1702 4008 2306 No Cond.t2 = 29.49 Pv3 = 1786 4246 2460 No Cond.t3 = 29.61 Pv4 = 2204 4246 2042 No Cond.t4 = 37.32 Pv5 = 2455 6281 3826 No Cond.t5 = 37.45 pv6 = 2890 6281 3391 No Cond.t6 = 37.5 pv7 = 3016 6281 3265 No Cond.t7 = 45.21 pv8 = 3099 9593 6494 No Cond.
Outside Dew Point 24 C
* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.
where mv is the rate of vapour mass transfer per unit area
Gt is the total vapour resistence (N s/kg)
Rt
W/m2
Rt is the total thermal resistence of the structure
Vapour Pressure(calculated) Pa pv2= pv1-mvG1
Saturated Vapour Pressure(Pa) From Saturated Water Tables
Difference Pa
t1=tai-qRsi
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MG
Approved by
Inside Air +Σ(Thermal Conductivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air
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Result*
No Cond.No Cond.No Cond.No Cond.No Cond.No Cond.No Cond.
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Project No. DateDESIGN CALCULATION D0052 21-Apr-23
Mechanical & Industrial Department SHEET Sheet No. Computed byC A I R O - E G Y P T 1 of 2 MG
Subject Condensation Calculation - Highest Relative Humidity Checked by Approved byBuilding Concourse 2 - Dubai International Airport TZ
Data
Layer
Inside Air 0.12
Interior Panels Plaster Board 0.05 0.16 50.00
Sound Insulation Ins. Fiberboard 0.05 0.06 20.00Air Gap (1) 1.00 0.18 5.00
Rigid Insulation 0.10 0.03 30.00Vapour Barrier Hardboard 0.01 0.13 520.00Ventilated Air Gap 0.30 0.18 5.00Exterior Cladding Plaster 0.02 0.25 50.00Outside Air 0.06
The calculation is based on inside conditions of 24C and 50%rh and outside conditions of 16C and 81%rh
Calculation of Heat Flow Rate and Vapour Mass Transfer Rate
= Σ(Vapour Resistivity x Thickness)
= Interior Panels + Sound Insulation + Air Gap + Rigid Insulation + Vapour Barrier + Ventilated Air Gap + Exterior Cladding
= 1.92E+10 (N s/kg)
= Inside Air +Σ(Thermal Conductivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +
Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air
= 0.56 (N s/kg)
= Pvi-Pvo = (1492.6-1473)/1.92E+10
= 1.02E-09
Pvi is the inside vapour pressure @ 24 C & 50% rh
Vaopur Resistivety &Thermal
Conductivety is assumed to be
similar to:
Assumed Thickness
m
Thermal Conductivity W/mk
Vapour Resistivity GNs/Kg m
Gt
Gt
where Gt is the total vapour resistence (N s/kg)
Rt
Rt
where Rt is the total thermal resistence of the structure
mv
Gt
Kg/m2s
where mv is the rate of vapour mass transfer per unit area
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Project No. DateDESIGN CALCULATION D0052 21-Apr-23
Mechanical & Industrial Department SHEET Sheet No. Computed byC A I R O - E G Y P T 1 of 2 MG
Subject Condensation Calculation - Highest Relative Humidity Checked by Approved byBuilding Concourse 2 - Dubai International Airport TZ
Pvo is the outside vapour pressure @ 16C and 81%rh
q = tai-tao = (24-16)/0.56
= 14.28where q is the rate of flow of heat per unit area tai is the inside air temp. tao is the outside air temp.
Calculation of Temperature And Vapour Pressure at Each Layer
Temperature (C) Result*
t1 = 22.29 Pv2 = 1490 2645 1155 No Cond.t2 = 22.17 Pv3 = 1489 2645 1156 No Cond.t3 = 22.13 Pv4 = 1484 2645 1161 No Cond.t4 = 19.56 Pv5 = 1481 2339 858 No Cond.t5** = 19.52 pv6 = 1476 2339 863 No Cond.t6** = 19.5 pv7 = 1474 2339 865 No Cond.t7** = 16.93 pv8 = 1473 1938 465 No 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 risk
of condensation .
Gt is the total vapour resistence (N s/kg)
Rt
W/m2
Rt is the total thermal resistence of the structure
Vapour Pressure(calculated) Pa pv2= pv1-mvG1
Saturated Vapour Pressure(Pa) From Saturated Water Tables
Difference Pa
t1=tai-qRsi
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MG
Approved by
Inside Air +Σ(Thermal Conductivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air
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Result*
No Cond.No Cond.No Cond.No Cond.No Cond.No Cond.No Cond.
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Project No. DateDESIGN CALCULATION D0469 21-Apr-23
Mechanical & Industrial Department SHEET Sheet No. Computed by
1 of 2
Subject Condensation Calculation - August peak conditions Checked by Approved byBuilding Tiara Residences-condensation check for staircase walls
Data
Layer
Inside Air 0.12
plaster plastering material 0.02 1.40 50.00
concrete wall 0.25 0.56 37.00
plaster 0.02 1.40 50.00inside air 0.12
The calculation is based on inside conditions of 24C and 50%rh
and outside conditions of 38C and 75%rh
Calculation of Heat Flow Rate and Vapour Mass Transfer Rate
= Σ(Vapour Resistivity x Thickness)
= interior plaster + concrete wall + interior plaster
= 1.13E+10 (N s/kg)
= Inside Air +Σ(Thermal Conductivity x Thickness)+inside Air = Inside Air + plaster + concrete wall+plaster
= 0.44 (N s/kg)
= Pvi-Pvo = (1492.9-4975)/1.13E+10
= -3.10E-07
Vaopur Resistivety &Thermal
Conductivety is assumed to be
similar to:
Assumed Thickness
m
Thermal resistivity mK/W
Vapour Resistivity GNs/Kg m
heavy weight concrete
Gt
Gt
where Gt is the total vapour resistence (N s/kg)
Rt
Rt
where Rt is the total thermal resistence of the structure
mv
Gt
Kg/m2s
where mv is the rate of vapour mass transfer per unit area
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Project No. DateDESIGN CALCULATION D0469 21-Apr-23
Mechanical & Industrial Department SHEET Sheet No. Computed by
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Subject Condensation Calculation - August peak conditions Checked by Approved byBuilding Tiara Residences-condensation check for staircase walls
Pvi is the inside vapour pressure @ 24C and 50%rh Pvo is the outside vapour pressure @ 38C and 75%rh
q = tai-tao = (24-38)/0.44
= -32.11where q is the rate of flow of heat per unit area tai is the inside air temp. tao is the outside air temp.
Calculation of Temperature And Vapour Pressure at Each Layer
Temperature (C) Result*
t1 = 28 Pv2 = 1803 3810 2007 No Cond.t2 = 29 Pv3 = 4666 4025 -641 condensation occurs
t3 = 33 Pv4 = 4975 5110 135Outside Dew Point 32.8C
* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.
Gt is the total vapour resistence (N s/kg)
Rt
W/m2
Rt is the total thermal resistence of the structure
Vapour Pressure(calculated) Pa pv2= pv1-mvG1
Saturated Vapour Pressure(Pa) From Saturated Water Tables
Difference Pa
t1=tai-qRsi
condensation very likely to occur
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Approved by
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Result*
No Cond.condensation occurs
* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.
condensation very likely to occur
