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RANGER1
17-06-2017, 10:45 PM
A client asked some time ago how important pipework insulation is in regards to lost plant efficiency, power savings etc.
Has anyone any recommendations or papers to justify real world savings, heat loads.
Mainly talking about 2 stage ammonia refrigeration systems, coolstores.

Thanks

Segei
18-06-2017, 04:08 PM
I don't know any paper but I read long time ago that we use 5-10% of refrigeration to keep plant cool. So any improvement of pipe insulation will save a few percent of energy but it will be costly energy savings. Actually you can determine cold storage real life energy use for keeping plant cool by compare surface of pipes+vessels insulation to insulation surface of cold rooms. This is based on assumption that heat transfer through pipe insulation and freezer insulation is the same.

RANGER1
18-06-2017, 08:47 PM
Sgei,
Client asks about power savings, all air coolers blocked with dust, pipe insulation if roof space on -33 deg C wet return block of ice dripping on ceiling, probably $1000000 roof can only tell him what I see.
If you had a 100 metre pipe in 30 degC with 100mm thick ice on it, it has to be something, but what I don't know.

Segei
18-06-2017, 10:56 PM
You can do a test. Switch off all evaporators, manually open 1 or 2 liquid solenoids to make liquid/vapor flow and run the smallest compressor to measure real load to keep plant cool.

RANGER1
19-06-2017, 08:07 AM
You can do a test. Switch off all evaporators, manually open 1 or 2 liquid solenoids to make liquid/vapor flow and run the smallest compressor to measure real load to keep plant cool.
Thanks for help & reply Segei

FaultCode
19-06-2017, 05:16 PM
A document that may help...

http://bit.ly/2rIDdPX

RANGER1
19-06-2017, 08:51 PM
A document that may help...

http://bit.ly/2rIDdPX

Thanks, because it's a broad statement although useful, no one appears to have carried out a practical test that I can find.

FaultCode
19-06-2017, 10:15 PM
Agreed, there seem to be lots of docs saying it saves 5 - 10% on energy but without any backup facts.

weagle
25-07-2017, 03:40 AM
There have been several papers written on this by RETA. You may be able to find this info there.