Well i am currently working as a project engineer for utilities at my factory .This is my first installation of chilled water system.So would be requiring some help in sizing the Chilled water supply and return tanks.I am attaching the picture along so that the system is easily understandable.
Water in Chilled water tank is at temperature of 5-6 C
Temperature of Water in Return Tank is around 18 C in Summer and around 14-15 C in winter
Chilled water generated is at 1228 m3/h i.e. 307m3/h by each chiller.
System requirement of chilled water is 856m3/h
I designed the Forward tank(140m3/h) with 10 minutes of buffer time that is the case if chillers go on shutdown due to power failure we would have 10 minutes to get system back online.
I calculated that all the time 131 m3 of water is inside the lines.
Now my concern is the Return Tank .How do i size it and on what basis.SHoudl i jsut keep it 140m3/h or need to size it and on what basis .