Re-use of cold in refrigeration system

[bart43]

Hello,

I am a process engineer currently working on a project concerning a low temperature operation. I try to make a proces scheme for an energy efficient cooling system in which part of the refrigrant-condensation is accomplished by using 'waste-cold' from a cold product stream. However not enough cold is available for the complete condensation and so additional cooling is required (preferrably) with an air condensor. This means two compressors and a 'high' and 'low' temperature condensation steps.

Is there someone who can tell me something about commercially available systems for the above described situation?

Thank you in advance,

Bart

[bart43]

I am afraid that my above written post is not very clear. In fact I am also curious to hear about any kind of options that are available to have a refrigeration cycle with two different condensing temperatures.

Thank you,
Bart

[Rob White]

.

You don't need two compressors you need two condensers.

The first condenser will remove the superheat and then the second
could do the actual condensing, maybe using a water cooled condenser
as a de-superheater and then you get the added bonus of heat recovery.

Then once you have de-superheated the discharge vapour you can then
use your waste cold process to condense the refrigerant.

Regards

Rob

.

[Segei]

Hello,

I am a process engineer currently working on a project concerning a low temperature operation. I try to make a proces scheme for an energy efficient cooling system in which part of the refrigrant-condensation is accomplished by using 'waste-cold' from a cold product stream. However not enough cold is available for the complete condensation and so additional cooling is required (preferrably) with an air condensor. This means two compressors and a 'high' and 'low' temperature condensation steps.

Is there someone who can tell me something about commercially available systems for the above described situation?

Thank you in advance,

Bart
What do you mean by "waste cold"? Can you clarify this or give example?

[mad fridgie]

Are you talking about a CO2 vapouriser/ re-condeser