Pressure drop through the suction line accumulator?

[Magoo]

Interesting drawing, looks like a oil recovery bottle on a flooded ammonia evaporator.
If not ammonia, could be anyones guess.
I can see why you have a 2 bar delta P from evap to compressor, with 3/8 dry suction.

[Magoo]

OK, I went back and read the original ost again, its R134A. Could still be a scavenge oil recovery line that rises up in vessel to control level, the 1/4 "line would restrict flow and limit it. Also the 3/8 dry suction may be intentional to restrict carry over.
What controls liquid feed to flooded evaporator ?

[frank721]

frank if suction line diameter is fixed by size of accumulator port,what the hell happened.when anyone has a vague out i call it the autoduhh syndrome it can happen any time.

the inlet of accumulator is fixed, but you can use adaptor to reduce the diamter

[frank721]

I think your compressor is going to suffer the world of pain, sooner, rather than later...

why do you think so? sooner not later?

[frank721]

That's a flooded evaporator... and a whole different ball game.

as i said before, this system is taken over from other people. so i want to figure out the problem.
do u have any suggestion on this so-called flooded evaporator?
thanks a lot

[frank721]

OK, I went back and read the original ost again, its R134A. Could still be a scavenge oil recovery line that rises up in vessel to control level, the 1/4 "line would restrict flow and limit it. Also the 3/8 dry suction may be intentional to restrict carry over.
What controls liquid feed to flooded evaporator ?

what do u mean by "scavenge oil recovery line that rises up in vessel to control level"?
can u elaborate it?
before the evaporator, there is a manual valve to control the feeding liquid.

[desA]

why do you think so? sooner not later?

My concern is about liquid slugs getting into the compressor, if the system is not controlled carefully.

If that's all taken care of & guaranteed as a non-event, then rest easy - if not, then you may want to research further.

[lowcool]

dunno here we go years ago came across this sort of cascade system and i reckon that something like this was used on the expansion recovery,over run what ever circuit,come suction accumulator what ever to keep the feed up to the refrigerant pump.must say it was a little bit bigger on sizing but.ammonia blokes should have an idea
anybody else good for ideas

[D.D.KORANNE]

The 1/4 inch pipe you mentioned is usually a support pipe . I have in one instance noticed that one of the pipe tilts if you test the accumulator indepedently . So to my knowledge it is a support pipe . Just check with manufacturer . Besides, give me the following data to select the right model for you to compare.
Refrigerant
evap capacity
condensing temp
evaporation temp .

[frank721]

My concern is about liquid slugs getting into the compressor, if the system is not controlled carefully.

If that's all taken care of & guaranteed as a non-event, then rest easy - if not, then you may want to research further.

ok, then what do u think shoud be taken care?

[frank721]

dunno here we go years ago came across this sort of cascade system and i reckon that something like this was used on the expansion recovery,over run what ever circuit,come suction accumulator what ever to keep the feed up to the refrigerant pump.must say it was a little bit bigger on sizing but.ammonia blokes should have an idea
anybody else good for ideas

thanks, any experience on R134a?

[frank721]

The 1/4 inch pipe you mentioned is usually a support pipe . I have in one instance noticed that one of the pipe tilts if you test the accumulator indepedently . So to my knowledge it is a support pipe . Just check with manufacturer . Besides, give me the following data to select the right model for you to compare.
Refrigerant
evap capacity
condensing temp
evaporation temp .

Refrigerant : R134a
evap capacity:1~1.5kW
condensing temp:40~50 degree C
evaporation temp:15 degree C

Thanks a lot! by the way how to transfer cooling capacity in unit of "tons of R22" to "kW of R134a"?