NH3 Piping

[GBRD]

G'day,

Does anyone have info on selection/design of vent line from receiver to condenser in a thermosyphon system?

regards

[josei]

You need this data:
compressor cooling capacity and shaft power, also condensing and suction conditions.

Procedure of sizing recommended by “Thermosyphon Oil Cooling,” guide from Frick-Imeco-York 1991

[charlie n]

This might help

[Magoo]

totally wierd question, receiver to condenser vent, with thermosyphon.
Thermosyphon what? oil cooler perhaps. Please clarify.
Thermo oil cooler oil side should be vented to compressor discharge, the liquid side should be vented to atmosphere. So requires two safety releif valves. To protect system from fire and some idiot that isolates the liquid side and liquid hydraulics the vessel.
magoo

[ref717]

yeah, pls. clarify your query GBRD.,why vent line from liquid receiver then back to condenser?,maybe non-condensible lines or relief valves from condenser & receiver.

[Peter_1]

I've seen a thermosyphon cooler of +/- 700 kW to precool cooked vegetables.
Then this question isn't that weird at all Magoo

[Peter_1]

@Charlie_N, may I ask, out of which book is this coming from?

[charlie n]

Peter_1, The table is from ASHRAE Refrigeration Handbook, 2006

[GBRD]

Hi Magoo, you seem to have got totally confused with this single line question. I'm talking of vent line FROM RECEIVER TO CODNENSER & not lines from safety valves etc.

[GBRD]

Hi Ref717,

You need vent line to keep receiver & condenser at same pressure & hence you try to equilize it through vent line. Its a must in a Thermosyphon Oil Cooling System, otherwise there could be issues like liquid drain from condenser to receiver & high system pressure...

regards

[GBRD]

Hi Josei,

You seem on the right track mate, can you elaborate further if possible.

regards

[RANGER1]

I would have thought charlie n chart was pretty good under 'VENT' vent for t/syphon lubricant cooling .
Also make it as big as possible as it can't hurt , only help .

[ref717]

yes GBRD you're definitely correct, we call this as the equalizing line.,this piping is required to relieve potential uneven pressure conditions inside the receiver. This pipeline is from the hot gas discharge line going to the top of the receiver tank as designed in our plant.We don't have a separate pilot receiver for the compressors' thermosyphon oil coolers.
You can check the website of "EVAPCO" bulletin 131-E" for the correct piping procedures.
I hope this aides you in your query..

best regards..

[josei]

You need this data:
compressor cooling capacity and shaft power, also condensing and suction conditions.

Procedure of sizing recommended by “Thermosyphon Oil Cooling,” guide from Frick-Imeco-York 1991

GBRD:

If You send data asked in my firt message Ill give you pipe diameter back.


04-13-2010

GBRD:

I checked Frick´s calculations vs diameters shown in attached table[Evapco´s Vessel].
Proximity of values is good enough for practical use.
You must use value of heat rejected by compressor to be oil cooled.


Josei

[josei]

04-13-2010

GBRD:

I checked Frick´s calculations vs diameters shown in attached table[Evapco´s Vessel].
Proximity of values is good enough for practical use.
You must use value of heat rejected by compressor to be oil cooled.


Josei

Please see this link..