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

LEVEL 4 ENERGY ASSESSOR TRAINING Lighting - Industry structure and light colour

LEVEL 4 ENERGY ASSESSOR TRAINING Lighting – Tungsten Fittings

LEVEL 4 ENERGY ASSESSOR TRAINING Halogen Tri-phosphate T – 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) 18w/ 3518w/8.27 3,500 = temperatureRa 8 = 80-90, 27 = 2,700 = temperature Fluorescent Fittings

LEVEL 4 ENERGY ASSESSOR TRAINING Lighting – Fluorescent Fittings T12 = 12/8ths = 38mm T8 = 8/8ths = 25mm T5 = 5/8ths = 15mm

LEVEL 4 ENERGY ASSESSOR TRAINING Lighting – Mercury and Sodium Fittings Mercury Lamps Low Pressure Sodium Lamps

LEVEL 4 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 * 0.5 * 0.8

LEVEL 4 ENERGY ASSESSOR TRAINING ANY QUESTIONS OR FEEDBACK