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Commissioning DRV on Domestic Hot Water

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Engpat

Mechanical
Joined
Jun 20, 2016
Messages
10
Location
GB
Hello,

I am currently working on a large hotel…

What is the correct way of setting the flow rate on double regulating valves (DRV) on the return legs of domestic hot water pipework?

Capture_hfscez.png


The image (click link above) shows the location of each DRV – There is one on the return of each room and then another on the main riser return before it connects back into the main domestic return circuit.

I believe the aim is to achieve just enough flow rate, to combat heat loss, in order to keep a minimum of 55 degrees circulating. If someone was able to provide a worked example it would help a lot. I have CIBSE guide C and G to hand.

(I realise that the automatic thermostatic throttle valves would have been an easier choice)

Thanks,
 
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