MISCELLANEOUS INTERNAL HEAT GAINS

HEAT GAIN FROM COMMON ELECTRICAL EQUIPMENTSource: www.engineeringtoolbox.com

Transformers

150 kVA and smaller : 50 Watts/kVA 150 - 500 kVA : 30 Watts/kVA 500 - 1000 kVA : 25 Watts/kVA 1000 - 2500 kVA : 20 Watts/kVA larger than 2500 kVA : 15 Watts/kVA

Switchgear

Low voltage breaker 0-40 Amps : 10 Watts Low voltage breaker 50-100 Amps : 20 Watts Low voltage breaker 225 Amps : 60 Watts Low voltage breaker 400 Amps : 100 Watts Low voltage breaker 600 Amps : 130 Watts Low voltage breaker 800 Amps : 170 Watts Low voltage breaker 1600 Amps : 460 Watts Low voltage breaker 2000 Amps : 600 Watts Low voltage breaker 3000 Amps : 1100 Watts Low voltage breaker 4000 Amps : 1500 Watts Medium voltage breaker/switch 600 Amps : 1000 Watts Medium voltage breaker/switch 1200 Amps : 1500 Watts Medium voltage breaker/switch 2000 Amps : 2000 Watts Medium voltage breaker/switch 2500 Amps : 2500 Watts

Motor Control Centers

Section : 500 Watts per section Low voltage starters size 00 : 50 Watts Low voltage starters size 0 : 50 Watts Low voltage starters size 1 : 50 Watts Low voltage starters size 2 : 100 Watts Low voltage starters size 3 : 130 Watts Low voltage starters size 4 : 200 Watts Low voltage starters size 5 : 300 Watts Low voltage starters size 6 : 650 Watts Medium voltage starters size 200 Amp : 400 Watts Medium voltage starters size 400 Amp : 1300 Watts Medium voltage starters size 700 Amp : 1700 Watts

Variable Frequency Drive

Variable frequency drive : 2 - 6% of kVA rating

Others

Bus duct : 0.015 Watts /ft Amp Capacitors : 2 Watts / KVAR

HEAT GAINS FROM OFFICE EQUIPMENTSource: Duska, M., Lukes, J., Bartak, M., Drkal, F., & Hensen, J. 2007. "Trend in heat gains from office equipment", Proceedings of Indoor Climate of Buildings, Strbske Pleso, 28 Nov - 1 Dec, SSTP, Bratislava, p. 6 pages on CD.

Table 1: Updated typical (peak) heat gains from a monitor

Table 2: Updated typical (peak) heat gains from a PC (without monitor)

HEAT GAINS FROM OFFICE EQUIPMENTSource: Environmental Design, CIBSE Guide A (London: Chartered Institution of Building Services Engineers) (2006)

Table 6.9: Heat gains from laser printers [CIBSE Guide A]

Table 6.10: Heat gains from photocopiers [CIBSE Guide A]

Table 6.11: Heat gains from office equipment [CIBSE Guide A]

Table 6-13: Average efficiencies of electric Motors [CIBSE Guide A]

Table 6-15: Average Drive Efficiencies [CIBSE Guide A]

Table 6-15: Measured Average Power Consumption of Passenger Lift Motors [CIBSE Guide A]

HEAT GAINS - MISCELLANEOUS

Table 6-17: Estimated sensible and Latent Heat Emissions from Animal Bodies at Normal Body Temperature [CIBSE Guide A]