7 replies to this topic

[SadiqChemy]

Hello

 

I have question regarding the refrigerant compressor ( which is part of refrigeration cycle ) .. if we use refrigerant to cool process gas stream for example to -30 oF .. What will happen to gas temperature if we reduce the power or the efficiency of the compressor? Is there a direct mathematical relationship ? 

 

I hope you help me

[Art Montemayor]

 

What gas temperature are you referring to?  --- the refrigerant’s or the process gas?

 

Your query is odd.  When you apply a refrigeration process (I must assume you mean a mechanical vapor compression system, since you don’t tell us), you don’t have the ability to vary or manipulate (reduce) the power or the efficiency of the compressor.

 

Perhaps you mean to state something else.

[SadiqChemy]

I mean process gas ..

 

The refrigerant compressor is driven by gas turbine and if the efficiency of gas turbine reduced , the power of refrigerant compressor is reduced also , right ?

[Art Montemayor]

How do you intend to reduce the efficiency of the gas turbine driver?   Or is yours an academic question?

[SadiqChemy]

Because gas turbine efficiency is effected by the ambient temperature . Increasing ambient temperature  will reduce the thermal efficiency of gas turbine which will reduce the power produced to refrigerant compressor I guess ??

[Bobby Strain]

I'm like Art. I don't understand your query. Turbine drives are typically designed so that they can provide the required power at higher ambient temperature. If the driver doesn't deliver power at the required speed, then the turbine/compressor speed is reduced. This is OK for most mechanical drive turbines, but larger single shaft machines, frame 7 and larger, will stall when the speed drops below 95% of the design speed. And I think your query is academic, indeed. You need to get a book that describes turbine operation. After you study a bit, return and ask your question.

 

Bobby

[SadiqChemy]

It is an industrial issue especially in the very hot countries like Middle East , they found that the propane recovery in the natural gas processing is affected by the ambient temperature because the feed gas is not cold enough before entering the absorber !

[SadiqChemy]

I cannot find the exact connection actually