Transcript Conducting an Energy Usage Study for a Commercial Office

Panida Boonyaritdachochai
The 11th Annual PQSynergy International Conference
Le Meridien, Chiang Mai
19-21 September 2011
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 Assumption
 Light Sensor Technology
 Monitoring Result
 Cost Assessment
 Conclusions
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 Location:
Power Quality (Thailand) Co.,
Ramkamhaeng Rd. Soi 90, Bangkok, Thailand.
Ltd,
 Power Supply: Metropolitan Electricity Authority (MEA)
 Lamp Technology: 2 Fluorescent Lamps
 Two cases in this study.
 Operation Time of Light Sensor


Turn On Lamp: 18.00
Turn Off Lamp: 06.00
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 A light dependent resistor (LDR) or photoresistor is a resistor
whose resistance decreases with increasing incident light intensity.
 A photoresistor is made of a
high resistance semiconductor. If
light falling on the device is of high enough frequency, photons absorbed
by the semiconductor give bound electrons enough energy to jump into
the conduction band.
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 This case study uses “Energy Platform 1” from
Dranetz.
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RMS variation
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Waveform Samples
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Avg value is used to
calculate
the electricity cost.
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 From the MEA monthly bill, our revenue
meter read as 635 kWh with billing 2,415.70
Baht. So, the average cost is 3.8 Baht/kWh.
 As an hour measuring of energy consumption
has average by 0.152 kWh, so the energy
consumption cost is approximately
(3.8*0.152) ≈ 0.5 Baht.
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 Case I: 2 FL lamps without light sensor
24 hours are assumed for turn on the lamps.
 The monthly bill will be (0.5*24*30) = 360 Baht.

 Case II: 2 FL lamps with light sensor
The lamps are turned on for 12 hours (6 pm – 6 am).
 The monthly bill will be (0.5*12*30) = 180 Baht.

 The cost reduction is 180 Baht/month.
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 Light sensor cost is about 300 Baht.
 The 3 years warrantee
 Specification 1500 W
 Reference: (http://eofficethailand.com/product.php?id_product=1607)
 Fluorescent Lamps
 The cost of FL lamps is not considered due to it is the
same for both cases study.
 The life cycle is 12,00o hours ≈ 1.3 year. This is
advantageous for extended life.
 Installation Labor is 300 Baht referred by an
electrical worker.
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 Total investment cost of light sensor is
Labor
Light Sensor
(300 + 300) = 600 Baht.
 The electricity reduction cost is 180 baht/month
 The payback period can be calculated from
(180 x 3) = 540 Baht
(180 x 4) = 720 Baht
 Saved our money for a year as (180 x 8) =
!!!!! 1,440 Baht !!!!!
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 The light sensor type LDR is “Energy Saving Technology”
for security, outdoor or landscape lighting system.
 As a simplified case study, it is less than 5 months for
payback period.
 A study of energy saving is influenced by many factors i.e.






type of lamp or sensor technology
electrical design
life cycle of technology
electricity tariff
Labor cost
etc
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[email protected]
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