NewmanRef
20-11-2015, 08:46 AM
Gents,
I hope you are all well!
I have been asked to design a refrigeration system to connect to an AHU supplying a food production factory. The client wants 100% back up should the system fail. The AHU has only 1 DX coil but I need to connect 2x 66kw multi compressor packs to it. 1 pack will do the duty whilst healthy and the 2nd pack is to be solely for 100% back up should the 1st pack fail. I am wondering if any of you guys have any ideas as to how we could configure this?
Obviously we have just one DX Coil and so just 1 refrigerant circuit, to which we need to connect both packs. I am thinking along the lines of motorised ball valves at the pack end to shut off whichever is not in use. My concern is with the refrigerant charge and how much refrigerant could potentially be trapped in the pack which is shut down, leaving the circuit short of gas. If we do not isolate the pack which is not in use then obviously we are likely to fill it up with oil from the other one?!
Any ideas please would be very much appreciated!!!
Thank you in advance!
I hope you are all well!
I have been asked to design a refrigeration system to connect to an AHU supplying a food production factory. The client wants 100% back up should the system fail. The AHU has only 1 DX coil but I need to connect 2x 66kw multi compressor packs to it. 1 pack will do the duty whilst healthy and the 2nd pack is to be solely for 100% back up should the 1st pack fail. I am wondering if any of you guys have any ideas as to how we could configure this?
Obviously we have just one DX Coil and so just 1 refrigerant circuit, to which we need to connect both packs. I am thinking along the lines of motorised ball valves at the pack end to shut off whichever is not in use. My concern is with the refrigerant charge and how much refrigerant could potentially be trapped in the pack which is shut down, leaving the circuit short of gas. If we do not isolate the pack which is not in use then obviously we are likely to fill it up with oil from the other one?!
Any ideas please would be very much appreciated!!!
Thank you in advance!