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Thread: Volume of circulating receiver
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30-08-2007, 07:57 PM #1
Volume of circulating receiver
Please advise me - how to calculate needed volume of circulating receiver?
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30-08-2007, 08:43 PM #2
Re: Volume of circulating receiver
I am assuming you mean a receiver that has refrigerant pumps to circulate the liquid refrigerant...
The size is based on several critical elements:
- The volume of liquid to be stored
- The maximum liquid level desired
- The volume needed for separating liquid from vapor before the compressor
The volume of liquid to be stored determines how much volume you need below the maximum liquid level of 1/2 of the vessel diameter.
In addition you need a minimum liquid level to ensure the refrigerant pumps can prime and operate.
These are the basic fundamentals for either a vertical or horizontal vessel.
This is a complex subject and will stretch over many replies from others also. This is just a starting point.If all else fails, ask for help.
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31-08-2007, 08:39 AM #3
Re: Volume of circulating receiver
US Iceman
Thanks for you reply. Yes i wrote about receiver that has refrigerant pumps. I think it`s a very interesting subject too. From one side it`s very simlpe, but from other it`s have some features. How do you calculate needed volume for calculating receiver?
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31-08-2007, 04:12 PM #4
Re: Volume of circulating receiver
The more difficult problem is estimating the volume of the evaporators that will be in defrost at any one time. If the evaporators are using hot gas defrost, the volume of liquid in the coils has to be stored in the receiver during defrost. This is what I call the surge volume.
This volume occupies the area between the normal operating liquid level and the maximum liquid level (before the compressors are de-energized due to high liquid levels).If all else fails, ask for help.
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03-09-2007, 02:21 PM #5
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03-09-2007, 10:47 PM #6
Re: Volume of circulating receiver
I think the pump retention time should be based on the liquid volume to re-fill the evaporators after defrost. However, you also have the surge volume from the evaporator defrost liquid (and pumpdown) providing a lot of liquid in the vessel.
I have seen some recommendations that say you need at least five minutes of retention time for the pumping rate.
As a point of argument I would say it is more important to make sure the liquid make-up supply can maintain the minimum pump liquid level during normal operation.If all else fails, ask for help.
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