Transcript level 4 energy assessor training

LEVEL 4
ENERGY ASSESSOR TRAINING
8. Level 3 re-cap lighting
and
Power Factor Correction
LEVEL 4
ENERGY ASSESSOR TRAINING
Power factor:
Φ = Power Factor = kVA/ kW, should be >0.9
LEVEL 4
ENERGY ASSESSOR TRAINING
Electrical Tariffs:
• 01 to 02 – Domestic, 01 day rate, 02 night rate, normally quarterly
accounts
• 03 to 04 - Industrial, 03 day rate, 04 night rate, normally quarterly
accounts
• 05 to 08 – Industrial but also monthly demand (MD), normally
monthly accounts
• 00 – Industrial and only on 100 kVA sites, with a CoP (Code of
practise) electricity meter. The meter could have either be a radio,
GPRS or GSM system whereby the Supplier can dial up the site or
pick up the radio signal without entering the building
LEVEL 4
ENERGY ASSESSOR TRAINING
• Definitions :• Luminous Intensity –
candela cd. A measurement of the magnitude
of luminance or light reflected from a surface ie. cd/sq.m.
• Luminous Lux – lumen (lm) a measurement of the visible light energy
emitted.
• Illuminance – lumens per square metre lm/sq.m or lux (lx) a
measurement of the light failing on the surface.
• Efficacy – efficiency of lamp in lumens per watt (lm/W) Luminous efficacy
– Luminous flux output Electrical power input.
• Glare Index – a numerical comparison ranging from about 10 for
shaded light to about 30 for an exposed lamp. Calculated by considering
the light source size, location, luminances and effect of its surroundings
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ENERGY ASSESSOR TRAINING
Lighting - Industry
structure and light colour
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ENERGY ASSESSOR TRAINING
Lighting – Tungsten Fittings
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ENERGY ASSESSOR TRAINING
Fluorescent Fittings
Halogen
Tri-phosphate
18w/ 35
3,500 = temperature
18w/8.27
Ra 8 = 80-90, 27 = 2,700 = temperature
T12 600 – 2FT = 55W halogen
VS
T5 2 = 24W
+ 10% for starter = 65W
+ 3 to 4 watts
‘Discharge’ means no filament
for electronic ballast
Can dim on this type of fitting
Saving in Watts = 37, 57% saving in Energy and CO2
Colour = 9,000 = Blue light
= 5,500 = Summer light
= 2,500 = 100w bulb natural
= 1,500 = Son = (Street light)
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ENERGY ASSESSOR TRAINING
Lighting – Fluorescent Fittings
T12 = 12/8ths = 38mm
T8 = 8/8ths = 25mm
T5 = 5/8ths = 15mm
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ENERGY ASSESSOR TRAINING
Lighting – Mercury and Sodium Fittings
Mercury
Lamps
Low
Pressure
Sodium
Lamps
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ENERGY ASSESSOR TRAINING
Lighting – Sodium and Metal Halide Fittings
High
pressure
Sodium
Lamps
Metal
halide
Lamps
LEVEL 4
ENERGY ASSESSOR TRAINING
Low voltage supply to buildings 11kVolts
LEVEL 4
ENERGY ASSESSOR TRAINING
Single phase supply is 240 volts is to most domestic and small commercial
buildings
Three phase supply 400 volts is most large commercial and public buildings
LEVEL 4
ENERGY ASSESSOR TRAINING
•To convert electrical power into Watts
= Volts * Amps = Watts
Example1
What size of fuse would you need for a 7.2kW shower? When supplied electricity is 240
volts
7.2 kW = 7200 watts
Amps = Watts/ Volts = 7,200/ 240 = 30 Amps
• To calculate the number of lights needed in an office =
Lux level *Area of Office (l * w)
=
Flux (Lumens/ fitting) * utilisation factor * maintenance
Example 2
An Office 8m long by 7m wide requires an illumination level of 400 lux on the working
plane. It is proposed to use 80 Watt fluorescent fittings having a rated output of 7375
lumens each. Assuming a utilisation factor of 0.5 and a maintenance factor of 0.8, design
the lighting scheme.
Number of fittings = 400 *8 * 7
= 7.59 = say 8
7375 * 0.5 * 0.8
LEVEL 4
ENERGY ASSESSOR TRAINING
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