Determine Energy needed to heat propane?

I need to determine the amount of energy need to heat a tank of propane from a low temp to a warmer temp.

I can’t quite model the system.

Right now I’m just figuring a constant mass (18 kg of propane) in a tank with a constant volume (0.0433 m^3) at saturation (temps between 30*F – 120*F and 1 atm outside the tank).

I know that the propane is saturated. What I don’t know is if I should just use some specific heat and not wory about the phases or if I should determine the amount of liquid and the amount of gas and then use a specific heat for each one. But I also don’t know how to do this (determine amount of liquid and gas.)

Accuracy is not to important as long as I am within +/-15% of actual energy required.

Any help in getting set in the right direction would be greatly appreciated!

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Tagged with: accuracy • atm • kg • Propane • right direction • saturation • specific heat • tank

Filed under: Energy

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