Calculation of heat exchange area for water bath vaporizers
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Calculation of heat exchange area for water-bath type gas vaporizer: Hot side (water): Fluid flow rate: 30,000 Kg/h (flowing state); specific heat capacity: 4.2 KJ/Kg*℃; inlet temperature: 22℃; outlet temperature: 18.8℃ (calculated value); heat transfer rate: 112 KW. Cold side (CO2): Fluid flow rate: 1,000 Kg/h; specific heat capacity: 0.96 KJ/Kg*℃; vaporization heat: 360 KJ/Kg; inlet temperature: -30℃; outlet temperature: 15℃; heat transfer rate: 112 KW. The average logarithmic temperature difference after calculation is approximately 21 degrees Celsius； Assuming the heat transfer coefficient taken for water to air is 6–18 W/㎡·℃ (I’m not sure if this coefficient is appropriate for liquid CO2 at the inlet) ； The calculated heat exchange area is several hundred square meters; I think there must be an error in the calculations for that area, so I’d like to ask everyone for their advice
Consultation? ? ? ? ? ? ? ? ? ?
Assuming the heat transfer coefficient for water to air is 6–18 W/㎡·°C, if 6 is used versus 18, the area difference is three times. Therefore, estimating the heat transfer coefficient is now dismissed as worthless!
CO2 has undergone a phase change, so the heat transfer coefficient won’t be this low