compressor desuperheating

[Dowadudda]

What do we call the valve that we use that you strap the thermostatic bulb to the discharge, and we regulate liquid to the suction. Y something. Desuperheats. Sort of like demand cooling but not. I need a PDF on the specs of these but I can't think of the darn name.

[intellitech]

What do we call the valve that we use that you strap the thermostatic bulb to the discharge, and we regulate liquid to the suction. Y something. Desuperheats. Sort of like demand cooling but not. I need a PDF on the specs of these but I can't think of the darn name.

It is a Sporlan Y1037 Temperature Responsive Expansion Valve. Bulletin 10-10-2.

[the mojo]

http://sporlan.jandrewschoen.com/10-10-2.pdf

[ascj]

What do we call the valve that we use that you strap the thermostatic bulb to the discharge, and we regulate liquid to the suction. Y something. Desuperheats. Sort of like demand cooling but not. I need a PDF on the specs of these but I can't think of the darn name.

You mean when you have hot gas bypass to to the suction of the compressor? And you need liquid injection to compensate for the increase suction temp?

[ascj]

http://sporlan.jandrewschoen.com/10-10-2.pdf

I never have run across that. This replaces the TXV? I don't see how this is piped.

[thermofridge]

Ive always called it a Y-10 valve, taken from the model number. I dont have too many left in service.

[thermofridge]

Ascj, the valve is piped between the liquid line and compressor crankcase. It senses discharge temperature and opens to allow liquid bypass to keep disharge temp. down. I have only seen its use on low temp. R22 racks.

[the mojo]

http://sporlan.jandrewschoen.com/10-207_082005.pdf

Page 7

[ascj]

Ascj, the valve is piped between the liquid line and compressor crankcase. It senses discharge temperature and opens to allow liquid bypass to keep disharge temp. down. I have only seen its use on low temp. R22 racks.

So it doesn't replace the evap TXV. It's just to try to keep discharge temps down and the same time lowering your capacity?

[intellitech]

So it doesn't replace the evap TXV. It's just to try to keep discharge temps down and the same time lowering your capacity?

For every 1 degree increase in suction vapor equates to an approximate 1 degree increase in discharge vapor temperature. So the Y1037 desuperheats the superheated vapor to keep discharge temperatures safe.

This would not decrease your capacity. Compressor capacity is increased by lowering your compression ratio. This is done by running a system with the maximum allowable suction pressure and minimum allowable discharge pressure. Basically this equates to more dense vapors being compressed and the compressor piston discharging to a lower discharge pressure (increase in volumetric efficiency).

It is all about keeping the compressor healthy.

[ascj]

For every 1 degree increase in suction vapor equates to an approximate 1 degree increase in discharge vapor temperature. So the Y1037 desuperheats the superheated vapor to keep discharge temperatures safe.

This would not decrease your capacity. Compressor capacity is increased by lowering your compression ratio. This is done by running a system with the maximum allowable suction pressure and minimum allowable discharge pressure. Basically this equates to more dense vapors being compressed and the compressor piston discharging to a lower discharge pressure (increase in volumetric efficiency).

It is all about keeping the compressor healthy.

Anything that bypasses the load is decease in efficiency. Does it keep the the system operating in its design parameters, yes. But it decrease efficiency.

I misplaced my words. I meant efficiency not capacity.

[intellitech]

Anything that bypasses the load is decease in efficiency. Does it keep the the system operating in its design parameters, yes. But it decrease efficiency.

I misplaced my words. I meant efficiency not capacity.

I think a study on the application of this valve would determine if a decrease in efficiency is taking place. I do agree with you though. One thing to think about though......on a TXV/receiver system with perhaps some liquid being stored in the receiver, would it not be safe to say that some of the liquid being stored could be being used to satisfy the Y1037 feeding the suction line?

Just something to think about.

[jpsmith1cm]

I think a study on the application of this valve would determine if a decrease in efficiency is taking place. I do agree with you though. One thing to think about though......on a TXV/receiver system with perhaps some liquid being stored in the receiver, would it not be safe to say that some of the liquid being stored could be being used to satisfy the Y1037 feeding the suction line?

Just something to think about.

No matter what, the compressor still has to do the work.