## Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

## Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

(OP)

I am trying to calculate the pressure change due to temperature fluctuations of an incompressible fluid (Transmission Fluid) inside a closed reservoir tank.

According to an equation I have found, h2 - h1 = c(T2-T1) + v(P2-P1), provides property changes of incompressible fluids where:

h = enthalpy

c = specific heat

T = Temperature

v = specific volume

P = Pressure

First, is this this the correct equation? Second, is there a good place to find these values for Transmission Fluid?

THANKS!!

According to an equation I have found, h2 - h1 = c(T2-T1) + v(P2-P1), provides property changes of incompressible fluids where:

h = enthalpy

c = specific heat

T = Temperature

v = specific volume

P = Pressure

First, is this this the correct equation? Second, is there a good place to find these values for Transmission Fluid?

THANKS!!

## RE: Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

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P.E. Metallurgy, Plymouth Tube

## RE: Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

http://www.eng-tips.com/faqs.cfm?fid=1339

Liquids are not incompressible and you need to include the bulk modulus to get a sensible answer.

However even the smallest amount of compressible gas will nullify any liquid expansion case.

Remember - More details = better answers

Also: If you get a response it's polite to respond to it.

## RE: Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

The first equation listed gives the change in enthalpy, but I don't see that it immediately relates to the problem at hand.

## RE: Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

## RE: Pressure Change Due to Varying Temperature of a Closed Cell Oil Tank with No Expansion Chamber

Remember - More details = better answers

Also: If you get a response it's polite to respond to it.