Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - Highest Relative Humidity Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

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

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resisitivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1492.6-1473)/1.92E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 24 C & 50% rh

Pvo is the outside vapour pressure @ 16C and 81%rh

Gt is the total vapour resistence (N s/kg)

D0052 29-Nov-14

1 of 2

TZ MK

MG

Thermal

Resistivity km/W

6.25

1.92E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

PlasterExterior Cladding

Assumed

Thickness

m

0.05

0.051.00

0.10

0.01

Layer

Rigid Insulation

Ventilated Air Gap 0.18

4.00

34.48

7.69

0.30

0.02

HardboardVapour Barrier

0.12

17.540.18

Sound Insulation Air Gap (1)

Gt

Vapour

Resistivity

GNs/Kg m

50.00

20.005.00

30.00

Inside Air

0.06

5.33

520.00

5.00

1.02E-09

50.00

Pvi-Pvo

1 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - Highest Relative Humidity Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

q = tai-tao = (24-16)/5.33

Rt

= 1.50 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 23.8 Pv2 = 1490 2985 1495 No Cond.

t2 = 23.4 Pv3 = 1489 2985 1496 No Cond.

t3 = 22 Pv4 = 1484 2645 1161 No Cond.

t4 = 21.8 Pv5 = 1481 2645 1164 No Cond.

t5** = 16.6 pv6 = 1476 1938 462 No Cond.

t6** = 16.5 pv7 = 1474 1938 464 No Cond.

t7** = 16.2 pv8 = 1473 1818 345 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 .

Result*Diffe

rence

Pa

Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

2 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - Highest Dew Point Temperature Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 24C and 50%rh

and outside conditions of 30.5C and 70%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resisitivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1492.6-2972)/1.92E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 24C and 50%rh

-7.71E-08

50.00

Pvi-Pvo

Gt

Plaster

0.06

50.00

20.005.00

30.00

0.12

Vapour

Resistivity

GNs/Kg m

Exterior Cladding

Thermal

Resitivity km/W

6.25

17.540.18

34.48

7.69

0.18

Inside Air

Sound Insulation Air Gap (1)

Rigid Insulation

Ventilated Air Gap

HardboardVapour Barrier

0.10

0.01

0.30

0.02

520.00

5.00

4.00

Assumed

Thickness

m

0.05

0.051.00

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

5.33

D0052 29-Nov-14

1 of 2

TZ MK

MG

Layer

1.92E+10

3 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - Highest Dew Point Temperature Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 30.5C and 70%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = (24-30.5)/5.33

Rt

= -1.22 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 24.1 Pv2 = 1686 2985 1299 No Cond.

t2 = 24.5 Pv3 = 1763 3169 1406 No Cond.

t3 = 25.6 Pv4 = 2148 3363 1215 No Cond.

t4 = 25.8 Pv5 = 2379 3363 984 No Cond.

t5 = 30 pv6 = 2780 4246 1466 No Cond.

t6 = 30.1 pv7 = 2895 4246 1351 No Cond.

t7 = 30.3 pv8 = 2972 4246 1274 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Differ

ence

Pa

Result*

4 of 22

Proj. No. :D0052

Computed by

Approved by

Inside Air +Σ(Thermal Resisitivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

29-Nov-14

MK

MG

5 of 22

Proj. No. :D0052

Computed by

Approved by

29-Nov-14

MK

MG

No Cond.

No Cond.

No Cond.

No Cond.

No Cond.

No Cond.

No Cond.

Result*

6 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - Highest Dry Bulb Temperature Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

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

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding

= (N s/kg)

where Gt is the total vapour resistance (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air

= (N s/kg)

where Rt is the total thermal resistance of the structure

mv = = (1322-2928.3)/1.92E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

1.92E+10

Outside Air

Vaopur

Resistivity

&Thermal

Conductivity is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Layer

Ventilated Air Gap

0.10

0.01

0.30

Hardboard

Inside Air

Sound Insulation Air Gap (1)

Rigid Insulation

6.25

17.540.18

34.48

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resistivity km/W

Assumed

Thickness

m

0.06

0.05

0.051.00

5.33

5.00

30.00

520.00

5.00

Exterior Cladding

7.69

0.18

4.00

-8.37E-08

50.00

Pvi-Pvo

Gt

0.02Plaster

7 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - Highest Dry Bulb Temperature Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 46C and 29%rh

Gt is the total vapour resistance (N s/kg)

q = tai-tao = 22-46/5.33

Rt

= -4.50 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistance of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 22.5 Pv2 = 1531 2810 1279 No Cond.

t2 = 23.9 Pv3 = 1615 2985 1370 No Cond.

t3 = 27.9 Pv4 = 2033 3782 1749 No Cond.

t4 = 28.7 Pv5 = 2284 4008 1724 No Cond.

t5 = 44.2 pv6 = 2719 9110 6391 No Cond.

t6 = 44.6 pv7 = 2845 9593 6748 No Cond.

t7 = 45.4 pv8 = 2928 9593 6665 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Diffe

rence

Pa

Result*Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

8 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 80C (0.1insulation) Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 22C and 50%rh

and outside conditions of 80C and 29%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1322-13749)/1.92E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

-6.47E-07

50.00

Pvi-Pvo

Gt

0.02Plaster

0.06

5.33

5.00

30.00

520.00

5.00

Exterior Cladding

7.69

0.18

4.00

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resisitivity

km/W

Rigid Insulation

6.25

17.540.18

34.480.10

0.01

0.30

Hardboard

0.05

0.051.00

Layer

Inside Air

Sound Insulation Air Gap (1)

Assumed

Thickness

m

1.92E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Ventilated Air Gap

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

9 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 80C (0.1insulation) Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 80C and 29%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = 22-80/5.33

Rt

= -10.9 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 23.3 Pv2 = 2940 2810 -130 Cond.

t2 = 26.7 Pv3 = 3587 3567 -20 Cond.

t3 = 36.2 Pv4 = 6824 5947 -877 Cond.

t4 = 38.2 Pv5 = 8765 6632 -2133 Cond.

t5 = 75.7 pv6 = 12131 40236 28105 No Cond.

t6 = 76.5 pv7 = 13102 41938 28836 No Cond.

t7 = 78.5 pv8 = 13749 45524 31775 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

Differ

ence

Pa

Result*

10 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 80C (0.15insulation) Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 22C and 50%rh

and outside conditions of 80C and 29%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1322-13749)/2.07E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

2.07E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Ventilated Air Gap

Layer

Inside Air

Sound Insulation Air Gap (1)

0.01

0.30

Rigid Insulation

6.25

17.540.18

34.480.15

0.05

0.05

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resisitivity

km/W

0.06

Hardboard

Assumed

Thickness

m

7.06

5.00

30.00

520.00

5.00

Exterior Cladding

7.69

0.18

4.00

1.00

-6.00E-07

50.00

Pvi-Pvo

Gt

0.02Plaster

11 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 80C (0.15insulation) Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 80C and 29%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = 22-80/7.06

Rt

= -8.2 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 23 Pv2 = 2823 2810 -13 Cond.

t2 = 25.6 Pv3 = 3423 3363 -60 Cond.

t3 = 32.8 Pv4 = 6425 5034 -1391 Cond.

t4 = 34.2 Pv5 = 9126 5323 -3803 Cond.

t5 = 76.7 pv6 = 12248 41938 29690 No Cond.

t6 = 77.4 pv7 = 13149 41938 28789 No Cond.

t7 = 78.8 pv8 = 13749 45524 31775 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Differ

ence

Pa

Result*Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

12 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 80C (0.2insulation) Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 22C and 50%rh

and outside conditions of 80C and 29%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Ventilated Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Ventilated Air Gap + Exterior Cladding + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1322-13749)/2.22E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

-5.60E-07

50.00

Pvi-Pvo

Gt

0.02Plaster

8.78

5.00

30.00

520.00

5.00

Exterior Cladding

7.69

0.18

4.00

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resisitivity

km/W

Hardboard

Assumed

Thickness

m

6.25

17.540.18

34.480.20

0.05

0.051.00

0.06

Layer

Inside Air

Sound Insulation Air Gap (1)

0.01

0.30

Rigid Insulation

2.22E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Ventilated Air Gap

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

13 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 80C (0.2insulation) Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 80C and 29%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = 22-80/8.78

Rt

= -6.6 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 22.8 Pv2 = 2721 2810 89 No Cond.

t2 = 24.9 Pv3 = 3281 3169 -112 Cond.

t3 = 30.6 Pv4 = 6080 4496 -1584 Cond.

t4 = 31.8 Pv5 = 9439 4759 -4680 Cond.

t5 = 77.4 pv6 = 12350 41938 29588 No Cond.

t6 = 77.9 pv7 = 13189 43700 30511 No Cond.

t7 = 79.1 pv8 = 13749 45524 31775 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

Differ

ence

Pa

Result*

14 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 70C (0.1insulation) (Ventilation Effect) Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 22C and 50%rh

and outside conditions of 70C and 29%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1322-9047)/1.67E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

1.67E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Ventilated Air Gap

Layer

Inside Air

Sound Insulation Air Gap (1)

0.01

0.00

Rigid Insulation

6.25

17.540.18

34.480.10

0.05

0.05

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resisitivity

km/W

0.06

Hardboard

Assumed

Thickness

m

5.07

5.00

30.00

520.00

0.00

Exterior Cladding

7.69

0.00

0.00

1.00

-4.63E-07

0.00

Pvi-Pvo

Gt

0.00Plaster

15 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 70C (0.1insulation) (Ventilation Effect) Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 70C and 29%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = 22-70/5.07

Rt

= -9.5 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 23.1 Pv2 = 2478 2810 332 No Cond.

t2 = 26.1 Pv3 = 2941 3363 422 No Cond.

t3 = 34.4 Pv4 = 5254 5324 70 No Cond.

t4 = 36.1 Pv5 = 6642 5947 -695 Cond.

t5 = 68.7 pv6 = 9047 29873 20826 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Differ

ence

Pa

Result*Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

16 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 70C (0.15insulation) (Ventilation Effect) Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 22C and 50%rh

and outside conditions of 70C and 29%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1322-9047)/1.82E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

-4.24E-07

0.00

Pvi-Pvo

Gt

0.00Plaster

6.80

5.00

30.00

520.00

0.00

Exterior Cladding

7.69

0.00

0.00

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resisitivity

km/W

Hardboard

Assumed

Thickness

m

6.25

17.540.18

34.480.15

0.05

0.051.00

0.06

Layer

Inside Air

Sound Insulation Air Gap (1)

0.01

0.00

Rigid Insulation

1.82E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Ventilated Air Gap

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

17 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Condensation Calculation - 70C (0.15insulation) (Ventilation Effect) Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 70C and 29%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = 22-70/6.8

Rt

= -7.1 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 22.8 Pv2 = 2383 2810 427 No Cond.

t2 = 25.1 Pv3 = 2808 3169 361 No Cond.

t3 = 31.2 Pv4 = 4930 4496 -434 Cond.

t4 = 32.5 Pv5 = 6840 5034 -1806 Cond.

t5 = 69 pv6 = 9047 29873 20826 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

Differ

ence

Pa

Result*

18 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Critical Condensation Calculation - 60C (0.1insulation) (Ventilation Effect)Checked by Approved by

Building Concourse 2 - Dubai International Airport

Data

The calculation is based on inside conditions of 22C and 50%rh

and outside conditions of 60C and 29%rh

Calculation of Heat Flow Rate and Vapour Mass Transfer Rate

Gt = Σ(Vapour Resistivity x Thickness)

Gt = Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier

= (N s/kg)

where Gt is the total vapour resistence (N s/kg)

Rt = Inside Air +Σ(Thermal Resistivity x Thickness)+Air Gap+Outside Air

Rt = Inside Air + Interior Panels + Sound Insulation + Air Gap + Rigid Insulation +

Vapour Barrier + Outside Air

= (N s/kg)

where Rt is the total thermal resistence of the structure

mv = = (1322-5784)/1.67E+10

= Kg/m2s

where mv is the rate of vapour mass transfer per unit area

Pvi is the inside vapour pressure @ 22C and 50%rh

-2.67E-07

0.00

Pvi-Pvo

Gt

0.00Plaster

5.07

5.00

30.00

520.00

0.00

Exterior Cladding

7.69

0.00

0.00

0.12

Vapour

Resistivity

GNs/Kg m

Thermal

Resisitivity

km/W

Hardboard

Assumed

Thickness

m

6.25

17.540.18

34.480.10

0.05

0.051.00

0.06

Layer

Inside Air

Sound Insulation Air Gap (1)

0.01

0.00

Rigid Insulation

1.67E+10

Outside Air

Vaopur

Resistivety

&Thermal

Conductivety is

assumed to be

similar to:

Plaster Board

Ins. Fiberboard

Interior Panels

Vapour Barrier

Ventilated Air Gap

D0052 29-Nov-14

1 of 2

TZ MK

MG

50.00

20.00

19 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Critical Condensation Calculation - 60C (0.1insulation) (Ventilation Effect)Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

Pvo is the outside vapour pressure @ 70C and 29%rh

Gt is the total vapour resistence (N s/kg)

q = tai-tao = 22-60/5.07

Rt

= -7.5 W/m2

where q is the rate of flow of heat per unit area

tai is the inside air temp.

tao is the outside air temp.

Rt is the total thermal resistence of the structure

Calculation of Temperature And Vapour Pressure at Each Layer

Temperature (C)

t 1 =t ai -qR si

t1 = 22.9 Pv2 = 1990 2810 820 No Cond.

t2 = 25.2 Pv3 = 2257 3169 912 No Cond.

t3 = 31.8 Pv4 = 3593 4759 1166 No Cond.

t4 = 33.2 Pv5 = 4395 5034 639 No Cond.

t5 = 59 pv6 = 5784 19039 13255 No Cond.

Outside Dew Point 24 C

* No condensation occurs when saturation vapour pressure is greater than the calculated vapour pressure.

Vapour

Pressure(calculated) Pa

pv2= pv1-mvG1

Saturated Vapour

Pressure(Pa) From

Saturated Water

Tables

Differ

ence

Pa

Result*

20 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Ventilation Air Required - Not To Exceed 60C Checked by Approved by

Building Concourse 2 - Dubai International Airport

Heat Gain To The Ventilated Air Gap:

Where

= 1642.62 BTU/hr

Ventilation air required:

Where

cfm = 42

= 20 l/s

= 30 l/s (For Safety)

Area through which air flow = 4*2.5*0.03/2

= 0.15 /2 = 0.075 m2 For air to enter

Velocity =

=

=

cfm is the required ventilation air

481

Therefore ventilation air requird is 5 l/s for each 1 m2

ΔT is the temperature difference in Fahrenheit

1648.615 = cfm(1.08)(176-140)

D0052 29-Nov-14

1 of 2

TZ MK

MG

Q = U A ΔT

Q is the heat gain to the ventilated air gap in BTU/hr

Q is the heat gain to the ventilated air gap in W

U is the overall heat transfer coeffient in W/m2k

A is the area in m2

ΔT is the temperature difference in Kelvin

Q = cfm(1.08)ΔT

W

Q = (3.85)(6.25)(353.15-333.15)

80 ft/min

0.03/.075

0.4 m/s

21 of 22

Proj. No. :D0052

Project No. Date

DESIGN CALCULATION

Mechanical & Industrial Department SHEET Sheet No. Computed by

C A I R O - E G Y P T

Subject Ventilation Air Required - Not To Exceed 60C Checked by Approved by

Building Concourse 2 - Dubai International Airport

D0052 29-Nov-14

1 of 2

TZ MK

MG

22 of 22