TANK Cooling Calculation

Calculation for 9000 Gallons Roof Tank Cooling System

Description

In Summer

Tank Volume, Gallons

9000 (34,000 lits)

Water Temperature Required Incoming Water Temperature

28 deg C/ 43 deg C

Desired Temperature Difference

15 C

o

Formulae

Q = m x Cp x (T2-T1) Cooling Capacity kW

=

o

Volume of Water lits x Sp x (T2-T1) C / 860 x T o

Sp , Specific heat of water

=

1.0 Kcal / Kg. x C

T, initial cooling period

=

6 hours COOLING LOAD o

T2 (Incoming water temp.)

=

43 C

T1 (reqd. water temp.)

=

28 C

T2-T1

=

15 C

Therefore, kW

= =

34,000 x 1 x 15/ 860 x 6 98.85 kW

To cool in 6 hour, TR

o

o

=

28.25 Tons (98.85 kW)

 Note: Total water flow rate can be calculated by = Total tank volume / cooling time i.e. 34000/6 = 5667 Lit/hr 

Units suggested 2 units of 50 kW each with flow 2.9 m3/hr and ∆T 15°C.

Calculation for 16000 Gallons Roof Tank Cooling System

Description

In Summer

Tank Volume, Gallons

16000 (60,600 lits)

Water Temperature Required Incoming Water Temperature

28 deg C/ 43 deg C

Desired Temperature Difference

15 C

o

Formulae

Q = m x Cp x (T2-T1) Cooling Capacity kW

=

o

Volume of Water lits x Sp x (T2-T1) C / 860 x T o

Sp , Specific heat of water

=

1.0 Kcal / Kg. x C

T, initial cooling period

=

6 hours COOLING LOAD o

T2 (Incoming water temp.)

=

43 C

T1 (reqd. water temp.)

=

28 C

T2-T1

=

15 C

Therefore, kW

= =

60,600 x 1 x 15/ 860 x 6 176.20 kW

To cool in 6 hour, TR

o

o

=

50.50 Tons (176.50 kW)

 Note: Total water flow rate can be calculated by = Total tank volume / cooling time i.e. 60,600/6 = 10,100 Lit/hr 

Units suggested 2 units of 80 kW each with flow 4.6 m3/hr and ∆T 15°C.