Expansion tanks for solar energy systems

Tanks sizing calculation of expansion tanks for heating systems

Volume of Fluid in the Collectors

litres

Volume of Fluid in the Pipes between tank and collectors

litres

Volume of Fluid remaining in the Solar Circuit

litres

Volume of heat

litres

V fl =

Total Volume of FLUID (water + antifreeze) in the Circuit Collectors + Pipes + Heat Exchanger + others components

litres

tmin

Minimum water temperature (system start)

°C

tmax

Maximum water temperature (system peak)

°C

Glycol percentage

e =

Expansion Coefficient for Water and Glycol

Vw =

Water reservoir (min 3 litres)

litres

ΔV =

Expansion of the fluid volume

litres

Vt =

Total volume

litres

pi =

Starting pressure (static pressure + 0,5 bar)

bar

pf =

Final pressure (pressure of the safety valve opening - 0,5 bar)

bar

Vn =

Nominal volume of the expansion tank

litres

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