electrical load calculations
DESCRIPTION
Electrical Load CalculationsTRANSCRIPT
electricalloadcalculationsjan2009 Page 1 of 10 10/27/2015
Electrical Load Calculations
Date:
Project No.:
Project Name:
Project Design Firm:
Project Designer:
Building Size (SF):
Actual Connected Load of Various Systems:
Group of Loads Connected Load in KW Watts/SF
Lighting
General Purpose Receptacles
Air Handling System
Smoke Removal System
Heating Equipment
Air Conditioning System
Computer Room Air Conditioning System
Computer Room/Server Room Equipment
Plumbing System
Fire Suppression System
Kitchen Equipment
Laboratory Equipment
Elevator Equipment
Misc. Load (______, ______, ______, ______)
Other Loads
Total Connected Load
Overall Connected Watts/SF: _________________
Project No: ____________
Page 2 of 10
Demand Load
Demand Factor (D.F.) % = Actual Maximum Demand of a Group
Connected Group Load
= < 1
**Diversity Factor = Maximum Demand of Various Group of Loads
Maximum Demand of Entire System
= > 1
Diversity Factor of 1.1 to 1.5 is applicable to most types of buildings.
Demand Load in kW = Maximum Demand of Various Group of Loads
(Over-all) Diversity Factor
Group of Loads
Connected
Load in KW
Demand Factor
D.F.
Group Demand
Load in KW
Lighting
General Purpose Receptacles
Air Handling System
Smoke Removal System
Heating Equipment
Air Conditioning System
Computer Room Air Conditioning System
Computer Room/Server Room Equipment
Plumbing System
Fire Suppression System
Elevator Equipment
Kitchen Equipment
Laboratory Equipment
Other Loads
Maximum Demand of Various Group of
Loads (Total of Last Column)
**Diversity Factor =
Project No: ____________
Page 3 of 10
Present Total Groups Demand Load = KW --- ¬
Future Capacity @ 20% = KW ---
Overall Demand = KW --- ¬ + ÷ Diversity Factor
Overall Demand in Watts/SF = W/SF
Service Size in Amps = Overall Demand KW
√3 x VL x IL x P.F
Service Voltage System: � 277/480V, 3P, 4W
� 120/208V, 3P, 4W
� 120/240V, 1∅, 4W
Service Ampacity: _______________ Amps
@ _____________ PF
Transformer Type: � Dry Type
� Liquifill
Transformer Size: _______________ KVA
Connected Watts/S.F. _______________
Demand Watts/S.F. _______________
*Historical Watts/S.F.
from Similar Building ________________________________________________________ (Building Name and Location)
*DSF can provide this data.
Connected Watts/SF
Calculated Maximum Demand in Watts/SF
Historical Maximum Demand in Watts/SF
Project No: ____________
Page 4 of 10
Air Handling System
Equipment Connected Load in KW
Supply Air Fans (SF’s)
Return Air Fans (RF’s)
Exhaust Fans (EF’s)
Circulating Fans
Relief Fans
Lab Exhaust Fans
Roof Top Units (RTU’s)
Other Fans
Destratification Fans
Unit Ventilators (UV)
Fan Coil Units (FCU)
Total Connected Load
Largest Motor HP: _________________
Largest Motor Name: _________________
Connected Load in Watts/SF = __________________
Review with mechanical designer for break HP rating of each motor load and stand-by motors.
Smoke Removal System
Equipment Connected Load in KW
Smoke Removal Fans
Largest Motor HP: _________________
Largest Motor Name: _________________
Connected Load in Watts/SF = __________________
Project No: ____________
Page 5 of 10
Heating Equipment
Equipment Connected Load in KW
Boiler (Minor Control Power)
Heating Hot Water Circulating Pumps
Boiler Water Pumps (Local Hot Water Boiler)
Steam Condensate Pumps
Boiler Feed Water Pumps
Electric Duct Heaters
Electric Humidifiers
Cabinet Unit Heaters
Electric Base Board Heaters
Snow Melting
Other
Total Connected Load
Largest Motor HP: _________________
Largest Motor Name: _________________
Connected Load in Watts/SF = __________________
Review with mechanical designer for break HP rating of each motor load and stand-by motors.
Use largest of heating or cooling load for service size.
Project No: ____________
Page 6 of 10
Air Conditioning System – Cooling Load
Equipment Connected Load in KW
Chilled Water System
-Chillers
-Chilled Water Pumps
-Cooling Tower (Condenser Water) Pumps
Air Cooled System
-Condensor/Compressor
Other Loads
Total Connected Load
Connected Load in Watts/SF = __________________
Use largest of heating or cooling load for service size.
Computer Room Air Conditioning System
Equipment Connected Load in KW
Dry Cooler Fans
Glycol Pumps
Room Air Conditioning Units
Other Loads
Total Connected Load
Connected Load in Watts/SF = __________________
Project No: ____________
Page 7 of 10
Computer Room/Server Room Equipment
Equipment List name plate data of each piece of equipment:
Connected Load in KW
Total Connected Load
Connected Load in Watts/SF =
Demand Load in Watts/SF =
Project No: ____________
Page 8 of 10
Plumbing System
Equipment Connected Load in KW
Domestic Water Booster Pumps
Sump Pumps
Electric Water Coolers
Electric Water Heaters
Other Loads
Total Connected Load
Connected Load in Watts/SF =
Fire Suppression System
Equipment Connected Load in KW
Fire Pumps
Booster Pumps
Other Loads
Total Connected Load
Connected Load in Watts/SF =
Coordinate with the mechanical control system designer for the interlocking of mechanical equipment
when fire pump runs (for proper diversity of load).
Project No: ____________
Page 9 of 10
Kitchen Equipment
Equipment Connected Load in KW
Electric Ranges
Electric Ovens
Walk-in Coolers
Walk-in Freezers
Dishwasher Heaters
Dishwasher Pumps
Dishwasher Motors
Kitchen Hood Fans
Electric Fryers
Other Load
Total Connected Load
Connected Load in Watts/SF = __________________
Laboratory Equipment
Equipment Connected Load in KW
Refrigerators
Fume Hoods
Other Equipment
Total Connected Load
Connected Load in Watts/SF = __________________
Project No: ____________
Page 10 of 10
Elevator Equipment
Equipment Connected Load in KW
Passenger Elevators
Service Elevators
Escalators
Total Connected Load
Number of elevators in the lobby:
Connected Load in Watts/SF =
Miscellaneous Equipment
Equipment Connected Load in KW
Temperature Control Panels
Duplex Air Compressors
Compressor Air Dryers
F.A. Power Supply
Other Loads
Total Connected Load
Connected Load in Watts/SF =