HOW YOU CAN CALCULATE CHILLED WATER EXPANSION TANK ?

If you are using some software from some expansion manufacturers then it is very easy just put some parameters like temperatures at max and min and volume of system which you have to calculate by adding voulme of all piping and equipments OR

you can make an excel sheet and put the formulae and it will serve but the formula is

Vt = volume of expansion tank, m3

Vs = volume of water in system, m3

v1 = specific volume of water at lower temperature, m3/kg

v2 = specific volume of water at higher temperature, m3/kg

P1 = pressure at lower temperature, kPa

P2 = pressure at higher temperature, kPa

α = linear coefficient of thermal expansion, m/(m · K)

Δt = (t2 − t1), K

t1 = lower temperature, °C

t2 = higher temperature, °C

Location : theoratically you can put anywhere in the loop but the normal location is in between chiller and pump on suction side of pump.

Hope this will work

 the expansion tank can be calculated through sample equation with this parameter

Vt=Volume of expansion tank

 Vs=Volume of water in system

 t1=Lower temperature 

 t2=Higher Temperature 

 Pa=Atmospheric Pressure 

Pi=Initial Fill or minumium Pressure at tank

P1=Absolute Pressure at lower   temperature (Pi + Pa) 

Pmax=Maximum System Allowable Pressure

P2=Absolute Pressure at higher   temperature (Pmax + Pa) 

n1=Specific volume of water   at lower temperature 

 n2=Specific volume of water   at higher temperature

 

 

Vt =         Pressure vessel volume Qmax =  Pump delivery capacity or system consumption A =          Number of pump starts – stops per hour (15 to20) Ps =         Pump stop (absolute) pressure Pa =        Pump starting (absolute) pressure Pp =        Absolute pre-charge pressure (Pa-0.5)

WHAT THE KIND OF EXPANSION TANK FOR HIGH RISE TOWER AND WHERE THE INSTALLATION LOCATION?