Expansion Tank Calculator

Input Parameters

Imperial (°F, BTU, ft)SI (°C, kW, m)

System Volume (cu ft)

Initial Temperature (°F)

Final Temperature (°F)

Initial Pressure (in WG)

Final Pressure (in WG)

Tank Volume gal

Expansion Volume gal

System Volume100 cu ft

ΔT160 °F

Initial Pressure12 in WG

Final Pressure60 in WG

Formula:

\Delta T = T_{final} - T_{initial}

Calculation:

\Delta T = 200 - 40

Result:

160.0 \text{ °F}

Formula:

V_{exp} = V_{sys} \times \alpha \times \Delta T

Calculation:

V_{exp} = 100.00 \times 1.20e-4 \times 160.0

Result:

1.920 \text{ gal}

Formula:

P_{abs} = P_{gauge} + P_{atm}

Calculation:

P_{initial,abs} = 12 + 14.7 = 26.7 psia\newline P_{final,abs} = 60 + 14.7 = 74.7 psia

Result:

\text{ }

Formula:

V_{tank} = \frac{V_{exp}}{1 - \frac{P_{initial}}{P_{final}}}

Calculation:

V_{tank} = \frac{1.920}{1 - \frac{26.7}{74.7}}

Result:

2.99 \text{ gal}