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Thread: Cold Room
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01-05-2010, 03:32 PM #1
Cold Room
Currently, I am working on refrigeration and do study’s at the same time to expand my knowledge. The more I know, the better service I can give to my clients.
Could you assist me on the following questions please?
How do I know what size compressor and coil do I have to use on different sizes cold rooms or freezer rooms? For example: My client asked me he wanted a freezer room, length 10m, width 6m, height 2.4m. This size is just an example.
How do I know what size of liquid line and suction do I have to use on the above mentioned?
How do I know at what settings do I set my LP / HP switch to on the above mentioned?
What is the purpose of the solenoid on the liquid line? I assume it’s to cut off the gas, and then build up the pressure to the LP /HP switch, which is switching off the compressor. Is there any other reason for the solenoid? For example: Is the cold room switched off by the thermostat and do you still need the solenoid? If yes, why?
I would really appreciate it if somebody can help me out with the correct info.
Thanking you in advance for your time and help.
Regards,
Chris van der Walt
South Africa
E-Mail: cc.vanderwalt@gmail.com
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01-05-2010, 05:39 PM #2
Re: Cold Room
Hi bro. Vanderwalt, if you're into ammonia refrigeration design and installation I strongly suggest that you should have your own Refrigeration handbook, codes and standards. The IIAR ammonia ref. piping handbook, ASHRAE handbook and ASME std. B31.5 would really help you in expanding your knowledge.
As basics, to be able to know the compressor or condenser equipment size, you should first compute your Net refrigeration capacity for a specific room or system(Total room heat loads + Product load). From this, you can also properly select the size of your evaporator cooler.
The liquid line solenoid valve is typical in all evaporator valve stations. This solenoid valve closes when your rm. temp reaches its required temp. as called by the rm. thermostat or temp. sensor. It will open as the temp. inside the rm. rises again. Nowadays, evaporator valve stations are also controlled by a PLC or SCADA system packaged with the whole ref. system.
I hope I gave you an idea. Good luck in your career.<"No one is so smart, they just stay with problems longer and use their imagination">
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01-05-2010, 05:40 PM #3
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Re: Cold Room
http://www.refrigeration-engineer.co...ad.php?t=19701
How do I know what size compressor and coil do I have to use on different sizes cold rooms or freezer rooms? For example: My client asked me he wanted a freezer room, length 10m, width 6m, height 2.4m. This size is just an example.
http://www.refrigeration-engineer.co...ad.php?t=24673
How do I know what size of liquid line and suction do I have to use on the above mentioned?
Buy some ASHRAE books.
How do I know at what settings do I set my LP / HP switch to on the above mentioned?
If LP is used as PUMP-DOWN control than it is set according to working pressures/temperatures.
http://www.ra.danfoss.com/TechnicalI...chapter_03.pdf
What is the purpose of the solenoid on the liquid line? I assume it’s to cut off the gas, and then build up the pressure to the LP /HP switch, which is switching off the compressor. Is there any other reason for the solenoid? For example: Is the cold room switched off by the thermostat and do you still need the solenoid? If yes, why?
Research on Google with PUMP-DOWN keyword.Last edited by nike123; 01-05-2010 at 05:51 PM.
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01-05-2010, 05:52 PM #4
Re: Cold Room
Thanks for all the info!!!!!!!!!!!
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