PFL306 - Employee awareness poster - Lighting
Assumption
"Office lights left on overnight use enough energy in a year to heat a home for almost 5 months."
Calculation
This fact is based on a typical small office space of 100m2 with 18 x 6ft (1800mm) T8 tubes at 70W each. Assuming lights are left on when the building is unoccupied for 14 hours (6pm-8am).
14(hours) x 70(Watts) / 1000 x 18(tubes) x 365(days) = 6438.6kWh.
Annual heating for a typical 3 bed semi-detached is 16,308kWh (Source: http://www.north-dorset.gov.uk).
Based on these calcutions you would be able to heat a 3 bedroom semi-detached home for 4 months and 22 days.
16,308kWh / 12(months) = 1359kWh per month / 31(days) = 43.84kWh per day.
6438.6kWh / 43.84kWh = 146.9 days (4 months and 22 full days).
PFL307 - Employee awareness poster - Heating
Assumption
"A 2°c increase in office temperature creates enough CO2 in a year to fill a hot air balloon."
Calculation
This fact is based on a typical office space of 1500m2 heated to 20°C using 226,500kWh gas for heating and hot water (Source: Carbon Trust - ECG019 - Energy use in offices). Assuming 75% energy is used for heating.
226,500kWh x 0.75(percent) = 169,875kWh.
Assuming outside temperature is 7°C during the heating season.
22°C (office temperature) - 7°C (outside temperature) / 20°C (office temperature) - 7°C (outside temperature) = 0.1538 (15.38% difference).
15.38% x 169,875kWh = 26,134.62kWh.
26,134.62kWh x 0.191kWh/kgCO2 (conversion factor for gas to weight in CO2) = 4991.711538kgCO2 / 1.98 (conversion factor for CO2 weight to volume) = 2521.07m3CO2.
Average hot air balloon volume is 2500m3 (Source: http://en.wikipedia.org).
PFL308 - Employee awareness poster - Refrigeration
Assumption
"A chiller door left open for 30 minutes a day wastes enough energy in a year to power a lighthouse for nearly 4 days."
Calculation
Assuming chiller is 5m3 single door refrigerated display cabinet. Standard power use is 0.2kWh (Source: http://www.eca.gov.uk).
0.2kW x 0.5(hour) x 365(days) = 36.5kWh.
Lighthouse 0.4kW x 24(hours) x 4(days) = 38.4kWh (Source: http://homepages.manx.net/fredd/autolight.html).
Based on these calculations you would be able to power the lighthouse for 3 days, 19.25 hours.
PFL309 - Employee awareness poster - Computer
Assumption
"Leaving a computer on overnight for a year creates enough CO2 to fill a double-decker bus."
Calculation
Assuming computer is energystar category 'A' and monitor is flatscreen 1280 pixels by 1024 pixels, it will use 0.107kWh when active. Assuming computer is left on when the building is unoccupied for 14 hours (6pm-8am).
0.107kWh x 14(hours) = 1.498kWh x 365(days) x 0.43kgCO2/kWh = 235.1111kgCO2.
235.1111 / 1.98 (conversion factor for CO2 weight to volume) = 118.74m3CO2.
Estimated volume of double decker bus = 102.12m3.
PFL310 - Employee awareness poster - Photocopier
Assumption
"A photocopier left on standby overnight wastes enough energy to make 30 cups of tea."
Calculation
Assuming a photocopier on standby uses 0.042kW, and is left on when the building is unoccupied for 14 hours (6pm-8am). Assuming cup of tea is 0.25 litres.
0.042kW x 14 hours = 0.588kWh.
Average cup of tea = 0.25 litres = 0.25kg.
Energy used to make cup of tea = 0.25kg x heat capacity of water (4200j/kg/˚C) x temperature rise (90˚C - 20˚C) = 73,500 joules = 0.02kWh.
0.588kWh/0.02kWh = 29.4 cups of tea.
PFL311 - Employee awareness poster - Air conditioning
Assumption
"Air conditioning an office for 1 extra hour a day uses enough energy in a month to power a TV for over a year."
Calculation
Assuming typical office floor area = 1500m2. Average air conditioning system uses 0.03kW/m2 (Source: http://www.cribe.uk.com). Assuming 32" widescreen LCD TV using 0.14kW.
0.03kW/m2 x 1500m2 x 1(extra hour) x 31(days) = 1395kWh.
Television energy use 0.14kW x 24(hours) x 365(days) = 1226.4kWh.
Based on this calculation you would be able to power television for 1 year, one month, and 19 days.
PFL312 - Employee awareness poster - Compressed air
Assumption
The energy wasted from a compressed air leak the size of a match head is responsible for yearly CO2 emissions equal to the weight of an elephant.
Calculation
Based on a typical 110kW compressor running 24/7 producing 18m3/minute = 635ft3/minute (18 x 35.3147 - conversion from cubic metres to cubic feet) at 7.5BAR (108psi). Match head is 1.6mm. Air lost through 1.6mm hole is 6.49cfm.
6.49/635.7 = 0.0102 proportion of compressor power needed to replace air lost.
110kWh x 0.0102 = 1.12kW x 24(hours) x 365(days) = 9838.15kWh.
9838.15kWh x 0.43kgCO2/kWh (conversion factor for kWh to CO2 weight) = 4230.40kgCO2.
An Asian Elephant weighs between 3000 and 5000kg (Source: http://www.wikipedia.org).
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