Expansion Tank Sizing

 

Sizing of Expansion Tanks
1.  Total Capacity of Expansion Tanks in Dormitory
 
Given:
Boiler Capacity                     250 gals
Radiators                             455 gals
Air Handling Unit                 50 gals
Heat Exchanger                    135 gals
Water Inside Pipe                 170 gals
 
Total Gallons            1060 gals
 
Solution: 
Pf  = Static Pressure of the Fluid in the Tank when the system is filled (psig)
H  = Distance of the inlet of expansion Tank to the top of the system (ft)
Dc = Density of the Fluid at its initial temperature (ib/ft3)
Vt = Minimum required Tank volume (gals)
Vs = Fluid Volume in the system (gals)
 
Vt = Vs (Dc/Dh-1)
        14.7 (1/Pf+14.7  - 1/Prv+9.7)
 
Where :
 
Pf    = H (Dc/144)+5
H     = 46Ft
Vs   = 1060 gals
Prv  = 90 psi
Dc   = 62.4lb/ft3 @ 50 0F
Dh  = 61.25lb/ft3 @ 150 0F
Pf    = 46(62.4/144)N
       = 24.9~25psi
 
Vt    = 1060 (62.4/61.25-1)
          14.7 (1/25+14.7  - 1/90+9.7)
 
       = 19.9/0.22
 
Vt    = 90.45 gals plus 10%
       = 99.5 gals
       = Say 100 gals
 
최소 필요 용량 100 gals.

 

첨부자료

 

Expansion Tanks.xls

0.10MB

Expansion tank sizing sheet.xlsx

0.10MB

Expansion tank water.xls

0.04MB

 

 

 

Calculation for expansion tank.xlsx

0.01MB