4 replies to this topic

[MicheleB]

Do you have some advice concerning ranges of temperature and of heat flux for glycol baths (TEG or glycol or mixtures with water)? 

[Art Montemayor]

 

You fail to tell us the details of your application.  Is it for cooling or heating?  Is it for use in chemical or food processing?  It is difficult – if not impossible – to give specific or valued advice when one isn’t furnished more than a sentence of a query.

 

I would not use a glycol heating fluid for a heating application and if forced to do it, I would limit it to 100 ^oC.  I would never use TEG as a heating fluid – it is expensive and forms corrosive by-products.

 

Glycol solutions are used as cooling mediums – especially if the application is in food processing.  Refer to the attached brochure and article.

 

 Dowtherm Inhibited Glycols.pdf   1MB   1793 downloads

 Selecting Heat Transfer Fluids.docx   24.13KB   240 downloads

 

[MicheleB]

The application is an Indirect Bath Heater which has to heat crude oil. I usually design water bath heater for natural gas heating but now one of my clients ask me to design an indirect heater with a Glycol bath in order to increase bath temperatures over 100°C.

 

My doubts concern the limit temperatures of various type of glycol (pure one or mixture with water) and the limit concerning the heat flux from the firetube to the bath.... 

[processengbd]

The best thing would be to contact an indirect heater manufacturer who has already designed one with glycol. Then you just need to prepare a datasheet specifying your process needs.

 

The thing is if you or your company is designing the hater then it means that you are going to take full responsibility of the equipment. Without prior experience you have nothing to rely upon.

 

Even suppose someone give you the heat transfer coefficients and other calculation even then it will not be enough for you and your company to manufacture the equipment and guarantee it. You will not be able to ensure that will work according to expectation of your client.

 

 

For future post please specify your requirement in detail, with drawing.

 

Regards

[Jiten_process]

You may like to refer  API-12K and GPSA. You will find some useful info. For Water Bath Heater as per API heat flux should be 10k-13k in FPS unit. For glycol API has not specified, but it should be lesser than water medium as the conductivity is less for glycol than water. 8k is a figure somewhere i have seen on onet for glycol. but its not authenticated.  

 

good luck