Unbalanced Chilled Water Piping

[naifmbo]

we have a main chilled water pipe branched to tow circuits , one of these circuits has been canceled and by passed. when we try to close that bypass and keeping the all water go in the other circuit the cooling capacity of that circuit is decreasing. Is that physicaly accepted!!?

any response will be appreciated.

 

[TD2K]

If I understand you correctly, when you close off the chilled water flow to the un-used leg forcing all the chilled water to the leg in service, the cooling capacity goes down?

That doesn't sound right to me, there's got to be something else going on in your system if that is what you are seeing.

 

[DMcMahan]

You have changed the system curve significantly. You may have gone far enough back on your pump curve to have reduced flow to your remaining online system.

You had a total water flow = flow to circuit one + flow to circuit two. Now you are taking flow to circuit two out of the system. Not knowing how your piping network is designed. You may have less flow to circuit one now than you did before.

 

[ChasBean1]

MIN (more info needed)

 

[quark]

DMc has a point.You should tell us discharge pressure of pump before and after bypass, give name plate details(head and capacity) and line sizes.

 

[canox23]

check the chilled water loop pressure on the system eather is to much or not enough check before and after pressure if is to much the water travel to fast or to slow trough the system and you will loose the cooling efficiency like DMC and quark sed check the pump inlet and outlet pressure. also will be good if you can install a gage to see the diferensial pressure in and out of the chiller. go by the design pressure drop across the coil and at the further point on your system.