View Full Version : Effect of Suction Super heat in flooded evaporator using Ammonia
pushkar sharma
22-01-2012, 06:26 AM
Dear all,
hello
i want to ask what is the effect of Suction Superheat in flooded evaporator using ammonia ?
does it same as in case of dry evaporator ?
how to handle it if i have a manual expansion valve ?
RANGER1
22-01-2012, 09:17 AM
pushcar, no superheat on this type of system.
Liquid recirculation or overfeed has a rate of example 4 to 1
4 kg of refrigerant sent to evaporator, 3 comes back as liquid & 1 kg converted to saturated gas.
No real superheat is measured, only air on/off temps as per design or if surge drum, correct level is achieved
by approx liquid feed solonoid on 70% of the time under full load conditions. Set manual expansion valve to meet above requirments.
NH3LVR
22-01-2012, 05:46 PM
There was a really good thread on this sometime back.
http://www.refrigeration-engineer.com/forums/showthread.php?4239-Liquid-Overfeed-Systems&highlight=brining
US Iceman wrote a paper on this. One of the best I have read. It is on the Internet, and a link is probably in the thread. I have it on my computer and will find it sooner or later.
RANGER1
23-01-2012, 10:23 AM
There was a really good thread on this sometime back.
http://www.refrigeration-engineer.com/forums/showthread.php?4239-Liquid-Overfeed-Systems&highlight=brining
US Iceman wrote a paper on this. One of the best I have read. It is on the Internet, and a link is probably in the thread. I have it on my computer and will find it sooner or later.
Some of it starts from post number 97 on above thread.
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