Discharge temperature for N2 vaporizer 4

[VFreshEngineer]

Hi all,

I'm a fresh mechanical engineer with no others in my company, so I don't really have anyone to discuss stuff with. I don't have much experience with thermodynamics, so I would really appreciate all the help I can get. I have to provide the minimum discharge temperature when at the highest rate and lowest pressure going through vaporizer. The vaporized medium will be Nitrogen. The pump specifications are as follows:

Any ideas how to approach this?

 

[VFreshEngineer]

Yeah, I did formulate my question completely wrong. I meant how do You calculate that the duty is 550kW @ 180 SCFH & 700bar.

 

[Caloooomi]

In this case I looked up the specific conditions in Coolprop and did:

Q = m dH

180K SCFH of LIN = 5915 kg/hr
inlet spec enthalpy = -65.3 kJ/kg
outlet spec enthalpy = 272.3 kJ/kg

which gives ~ 550 kW.

In reality the inlet temperature will be dependent on the tank pressure, how recently it was filled etc. Exactly at -196 degC / 700 barG we'd be above melting pressure according to Refprop, but we are in that region for duty.