Hvac electric loads

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Mayimbe

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Horsham, UK
Hello, Im designing the auxiliary services for sub stations buildings. A few days ago, the mechanic engineer passed me the power needed for the HVAC system, for example:

AIR HANDLER UNIT: 25 HP @ 480V

CONDENSER UNIT: 95 KW @ 480V

SUM. FAN: 1 HP @ 208 V

CLEAN AGENT EXTRACTOR: 1 HP @ 208 V

BATTERY ROOM EXTRACTOR: 0.5 HP @ 208 V

and a note: assume 3 kw for 14 dampers at every substation.

so, when im designing the distribution boards for this loads, i found out that he (the mechanic engineer) didnt know the power factors of this loads, or why is it 3 kw for the electric motors for the dampers and how its feeded.

Has anyone here have worked with this types of loads??
What power factor did you assumed?
Whats the load for the control dampers? i went on wikipedia, and ruskins, but I did not find much information.

thanks
 
Mayimbe said:
Hello, Im designing the auxiliary services for sub stations buildings. A few days ago, the mechanic engineer passed me the power needed for the HVAC system, for example:

AIR HANDLER UNIT: 25 HP @ 480V
CONDENSER UNIT: 95 KW @ 480V
SUM. FAN: 1 HP @ 208 V
CLEAN AGENT EXTRACTOR: 1 HP @ 208 V
BATTERY ROOM EXTRACTOR: 0.5 HP @ 208 V

and a note: assume 3 kw for 14 dampers at every substation.

so, when im designing the distribution boards for this loads, i found out that he (the mechanic engineer) didnt know the power factors of this loads, or why is it 3 kw for the electric motors for the dampers and how its feeded.

Has anyone here have worked with this types of loads??
What power factor did you assumed?
Whats the load for the control dampers? i went on wikipedia, and ruskins, but I did not find much information.

thanks
Click to expand...

From the information provided, you can begin the design of the power distribution system for the ancilliary equipment, but it is preliminary until you get shop drawing/data sheets for the equipment provided. For example the damper actuators may be 24VAC.

For assumptions on power factor to convert to VA or Amps, I'd use .6 for the dampers and .8 for the condensor.
 
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