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29-04-2024, 11:06 AM #3
Re: Design pressure for cascade systems according to ASHRAE 15
Thank you MrFreez, for your answer!
If I understand correctly you did system witch CO2 on the second stage. My design is quite different, I'm going to use R23+R14 blend (R14 to go below -80 celsius without using 3rd stage). Currently I expect operating high pressure to be up to 21 barg (305 psig). So giving 20% buffer my Desing pressure should not be lower than 25.2 barg (366 psig). The system is also designed as a "limited charge system", I have a buffer tank to store evaporated refrigerant while the system is turned off, so there is no need for extra chillers to keep it liquefied.
I would like to not exceed 400psig design pressure. Most UL and ASME certified components which are available in Europe have 400pisg rating. Importing components from US takes a lot of time and usually cost a lot.
Does my system design sounds good to you and I can stay with 400psig design pressure?
Thanks,
Adrian