I am very new to askmehelpdesk.com. My question is,

The building height is 300m. There are 6 chilled water risers going up to 125m height. The chilled water flow rate of each riser as follows.

Riser 1 & 2 - 150l/s
Riser 3 & 4 - 180l/s
Riser 5 & 6 - 100l/s

Chilled water is coming from District cooling plant. and feed to the Primary Heat exchanger. Then it feed to Level 31 (125m) via Chilled water pump through above riser.

Please confirm followings requirement
Pressurization Unit requirement
Dearator Requirement
Expansion tank Requirement


Thanks

Lowtax4eva

I'm confused, if this is homework then as a rule we dont give you the answer, if you want to start working on this and come back when you get stuck we could defiantely try and help.

If your actaully constructing and building and looking for the answer here, i am scared

tsnhvac

You have mentioned the height of the tower is 300 m, whereas all your chw risers are serving upto 125 m, i can imagine it is with intermediate plant rooms and 125 m is the maximum height of one of the risers , if i am right then you can select the pressurization unit as follows,

density x acc due to gravity x height / 100000 = 1000x9.81x125 / 1000 = 12.25 bars this should be your cut in pressure and your cut off pressure shall be around 1 bar or even more based on the pressure increase imparted by your pump. However this much high pressure is not required if the pump and pressurization tank shall be located at the top of the riser i.e the water column will not act on it.
trust it clarifies.