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CO2 Heating and Condensation

CO2 Heating and Condensation

CO2 Heating and Condensation

(OP)
Hi all,

I am involved in designing a supercritical pilot plant. I have a two part question.

1) Finding the heat duty for heating liquid CO2 from -20C to 60C which is flowing at 300kg/hr at 100 bar. I came up with 48,000kJ by finding the specific heat (cp) from NIST tables for 100 bars at -20C and plugging it into Q=m*cp*dT. I just wanted to check if this is the right equation to use since there is also a phase change from liquid to supercritical.

2) Finding the cooling duty required to condense gaseous CO2 at 25 bar and 0C back to -20C.

I appreciate any help.

Thanks.

RE: CO2 Heating and Condensation

you can use tables and assume contant cp but I would suggest tools as NIST Refprop or Prode Properties, given two operating conditions these calculate directly the enthalpy difference with the help of a equation of state, you can use one of these tools to verify your result.

RE: CO2 Heating and Condensation

(OP)
Thanks for both replies.

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