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HEAT LOSS CALCULATION - TANK FARM [HOW MUCH INSULATION/HEAT REQUIED TO MAINTAI
Description: Basically it’s a tank farm located in a room maintained at 13oC. There are 6 tanks located very close to each othe
can say resistance to heat flow is negligible. These tanks contain hot organic liq at 45oC and as its viscous we can't afford to dr actually taking out this liquid for processing. Firstly we need to calculate the thickness of insulation requied. We can also give th bottom using heater [lets say natural gas heater] by keeping them uninsulated from the bottom and just insulate other surfaces without any stirrers inside. HEAT LOSS AFFORDABLE BY LIQUID
Units
Length of tank ,l width of tank ,b height of tank ,h thickness of tank ,x
= = = =
2.3 3.1 2.55 0.006
m m m m
Total Surface area of one tank Surface area of 6 tanks, A
= =
2 42 m 2 251 m
Volume of the metalic stucture (consider the surface area as one plane surface to calculate weight) =
3 2m 3 7980 kg/m
Density of steel metal [Assumed]
=
Mass of the metal tanks
=
12008 kg
Temperature inside the tanks
=
o 45 C
Temperature required to be maintained in the tank
=
o 35 C
Specific heat capacity of liquid inside the tank [Assumed- it would be less than Cp of water as the liquid is organic liquid] = Mass of the tank liquid (Added for all the 6 tanks)
2 kJ/kg C
= =
102 T 102000 kg
Heat loss from the tank fluid to tank walls - affordable heat loss =
HEAT REQUIRED TO HEAT UP THE METAL TANKS [AS THEY ARE AT ROOM TEMP AT THE BEGINNING] 0.49 kJ/kg K
Specific heat capacity of carbon
=
Inside maximum temp in the tank [tank liquid temp]
=
o 45 C
Inside surface temp of tank [initial temp]
=
o 13 C
Mass of the metal tanks
=
12008 kg
Heat required to heat up the metal surface
=
188290 kJ
Inside tank wall temp at equilibrium
=
o ???? C
********************************************************************************************************** HEAT LOSS THROUGH TANK METAL SURFACE => q=kAdT/x Thermal conductivity of carbon steel [Assumed at 50C], k
= =
Inside surface temp of tank
=
o ??? C
Outside surface temp of tank
=
o ??? C
54 W/m K 54 J/m.sec.K
************************************************************************************************************* HEAT LOSS THROUGH CONVECTION BY AIR [AIR AT ROOM TEMP =13C] Air temp in the room
=
13 C
Convective heat transfer coefficient of air [10-100 W/m 2 K]
******************************************************************************************************** HEAT LOSS THROUGH TANK METAL SURFACE AND INSULATION Thermal conductivity of glass wool insulation
=
0.04 W/m K
O
ION/HEAT REQUIED TO MAINTAIN 35 C TEMPERATURE?]
are 6 tanks located very close to each other, let's say no gap in between them, so you
5oC and as its viscous we can't afford to drop down the temp below 35oC when we s of insulation requied. We can also give the provision to heat up the liquid from the he bottom and just insulate other surfaces (no insulation at top). Tanks are storage tanks
Remarks
Considered all sides to get the max surface area
I THINK WE NEED TO CONSIDER THIS HEAT LOSS AS WELL (Am I correct?)
