Building a CO2 Thermosyphon: Tips for Compressing Gas to 7MPa Pressure

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Discussion Overview

The discussion centers around the construction of a CO2 thermosyphon and the methods for compressing CO2 gas to a pressure of approximately 7MPa. Participants explore various approaches to achieve the necessary high pressure for convection, including considerations of gas state and equipment options.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about building a rig to compress CO2 gas to 7MPa for a thermosyphon project.
  • Another participant references a vapor pressure graph, noting that CO2 liquefies at 70 bar (7MPa) at 300K, questioning the feasibility of the initial inquiry.
  • Suggestions are made for using high pressure cylinders if only a small amount of CO2 is needed, or for industrial users to purchase liquid CO2 and store it in a refrigerated tank.
  • A participant emphasizes that high pressure will cause CO2 to liquefy and notes the temperature at which this phase change occurs, sharing their status as a student with limited experience and budget.
  • Another suggestion involves buying CO2 at 1 atm and warming it in a closed system to achieve the desired pressure while noting the cooling effect of gas expansion.

Areas of Agreement / Disagreement

Participants express differing views on the best approach to achieve the desired CO2 pressure, with no consensus reached on a single method. There are also questions about the feasibility of compressing CO2 to the specified pressure and the implications of phase changes.

Contextual Notes

Participants mention specific temperature and pressure conditions for CO2 but do not fully resolve the implications of these conditions on the project. There are indications of limited experience and budget constraints affecting the proposed methods.

Who May Find This Useful

This discussion may be useful for students or hobbyists interested in thermodynamic systems, gas compression techniques, or those working on similar projects involving CO2. It may also benefit individuals exploring industrial applications of CO2 in thermosyphon systems.

Avis
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Is there a way to build a rig so that I could compress CO2 gas to apressure of roughly 7MPa?

I am building a CO2 Thermosyphone and need high pressure CO2 in order to get convection to occur.

Any help or advice would be greatly appreciated
 
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At 70b it liquefies at 300K.
http://encyclopedia.airliquide.com/images_encyclopedie/VaporPressureGraph/Carbon_dioxide_Vapor_Pressure.GIF
Are you pulling our leg?
 
Last edited by a moderator:
If you only need a relatively small amount, high pressure cylinders would be the way to go. If you're an industrial user, purchasing it as a liquid and maintaining it in a refrigerated liquid storage tank is common. The liquid can be pumped by a single stage reciprocating machine.

Talk to your industrial gas supplier to see what's best for you.
 
Enthalpy said:
At 70b it liquefies at 300K.
http://encyclopedia.airliquide.com/images_encyclopedie/VaporPressureGraph/Carbon_dioxide_Vapor_Pressure.GIF
Are you pulling our leg?

Exactly high pressure will cause CO2 to liquefy thus at roughly 31 degrees it will change state and evaporate.

I am a student and I am building this as part of my degree project. We do not need much. We have a very limited budget. I haven't had any experience in doing this so I'm basically learning from scratch.
 
Last edited by a moderator:
Buy CO2 ice cold at 1atm, enclose it (with free volume!) cold at 1atm and warm it enclosed to room temperature so it gets liquid+vapour at 70b, use it.

You're aware that expanding the gas will cool it and the rest of the tank as well, are you?
 

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