Condensing pressure

[wb]

Alright fellas,

Please make this painless....

Quote from Text Book:
"The Condenser is where the head pressure is created"

This insinuates that the head pressure is created by the refrigerant in the condenser and not by the compressor.


I don't really know how to ask this question for a painless answer, but here goes.......

If the head pressure is created by the condenser then what does the compressor do???

Yeah I know it pumps heat laden vapor from the evaporator to the condenser.... I know it compresses the refrigerant and increases the temperature by means of heat of compression. I know it circulates the refrigerant throughout the circuit. But,,,,Doesn't it also create the head pressure???

So which is it.... the compressor or the condenser that creates the head pressure??

Is this one of those...."which came first the egg or the chicken" things??

Thanks...

[absrbrtek]

You reading Doolans POS handbook?

[wb]

Refrigeration & Air Conditioning Technology

[frozensolid]

It could be argued, that head pressure is the result of condenser pressure on the discharge valve. The compressor is merely increasing volume in the condenser. It must exceed head pressure, before discharging its gas through the discharge valve.

[Shophound]

Note carefully the wording in the following sentences:

"The condenser is where head pressure is created."

"Head pressure is created by the condenser."

Is there a difference? How about this:

"Head pressure is created in the condenser, but it is created by the compressor."

Still not the most accurate wording, I would agree.

[NormChris]

Shophound has it right. WB, your straining a bit too much on this one. Of course the compressor raises the pressure and the condenser is just the container in which the high pressure refrigerant is sent. Just think of the condenser as a container with lots of surface area so heat can be rejected.

[Edmund Forsthe]

the compressor compresses a vapor to a high pressure ambigously say 500 pounds it then goes through the condenser and is changed to a liquid, you go down in pressure to say 200 you then take your reading at the disharge outlet of the condenser so is it wrong to say the efficiency of the condenser is directly proportional to the head pressure then?

[NormChris]

Originally posted by Edmund Forsthe
the compressor compresses a vapor to a high pressure ambigously say 500 pounds it then goes through the condenser and is changed to a liquid, you go down in pressure to say 200 you then take your reading at the disharge outlet of the condenser so is it wrong to say the efficiency of the condenser is directly proportional to the head pressure then?

Nearly everything you just posted is either incorrect or highly confused. What you described is not at all what happens. And, no the efficiency of the condenser is not proportional to pressure.

[Edmund Forsthe]

i guess its when the condenser is dirty head pressure is high clean pressure lower maybe i'm just misunderstanding the situation.

[wb]

Thanks very much to all....

Thanks Norm.

[wolfdog]

Norm was diplomatic about that, wasn't he.

[brettln]

Originally posted by shophound
Note carefully the wording in the following sentences:

"The condenser is where head pressure is created."

"Head pressure is created by the condenser."

Is there a difference? How about this:

"Head pressure is created in the condenser, but it is created by the compressor."

Still not the most accurate wording, I would agree.

And the pressure is maintained by restrictive action of your metering device. Thats how I see it anyway.

[Carnak]

Originally posted by NormChris

Originally posted by Edmund Forsthe
so is it wrong to say the efficiency of the condenser is directly proportional to the head pressure then?

And, no the efficiency of the condenser is not proportional to pressure.




Curious as to your definition of condenser efficiency.

I am wondering if you are looking at it as the ratio of the theoretical maximum heat transfer vs the actual heat transfer.

A small highly efficient heat exchanger can transfer the same amount of heat as a large innefficient one.

I would say the head pressure is proportional to the rate at which the condenser can transfer heat to the ambient.

It would be an inverse relationship but none the less proportional.

It just seems you are being a little too critical and anal here.

[top-notch-tek]

Inversely Proportionate.

Thank you, ladies and gentlemen. :)

[Green Mountain]

The compressor creates the discharge pressure. The condenser regulates the discharge pressure. Although it is not the the primary function of the condenser to regulate the pressure.

[top-notch-tek]

This thread should be moved to 'ENGINEER-Talk.com'.

:p Ha Ha He He :p

Who gives a shizzle???

A condenser condenses...

[Edmund Forsthe]

my impression is what bennie stated, too much you dont learn in school or just take for granted on a day to day basis till somebody bring something up and you find out how much you dont know.