electricity demand analysis - portland state...
TRANSCRIPT
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Electricity Demand Analysis
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Rural Electricity Demand
Ø In remote location where people never had electricity before, the power used by each household typically ranges from 80W to 120W or 200W. It varies by country, village, and project.
Ø In larger communities and for small businesses, the demand in electricity increases with refrigerators, motors, etc.
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Demand Profile - Example
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Powe
r (kW
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Time
MH Las Juntas, 2006
Source: Soluciones Practicas
Evening peak
Morning peak
Ø The maximum electricity use is usually at night for lighting and TV
Ø There is also electricity use in the morning for light for breakfast
Ø The rest of the day, usage is minimal, unless machinery or business uses it
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Power rating & Energy use examples
Load Description" Qty"
Power Rating
(W)"
Total Power
(W)"
Operating Time (hrs/
day)"
Energy Consumption
(Wh/day)"
Incandescent Light Bulb 5 60 300 5 1500
Compact Fluorescent 5 13 65 5 325
Refrigerator 1 170 170 12 2040
Radio 1 30 30 4 120
Television 1 100 100 3 300 Clock or cell
charger 1 4 4 24 96
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Qty Watts Total Power
Hours/day Inverter Efficiency
Wh / day
DC CFL 4 11W 44W 4 n/a 176 Wh
DC LED 2 1.5W 3W 11 n/a 33 Wh DC small TV 1 40W 40W 1.5 n/a 60 Wh
Total DC 87W 269 Wh AC load (Refrigerator)
1 170W 170W 12 85% 2400 Wh
TOTAL 193W 2669 Wh
Electrical Demand Analysis – Example 1
Notes: 1) Not all equipment is on at the same time, and some equipment have a surge when they start, so the total power rating needed maybe less or more than in this table. 2) This information needs to result from a credible survey of the user community, or be generated within the community
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Demand Analysis Example 2
Ø This is an example of a table to estimate how power use in a village can grow over time.
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Power Rating of Common Appliances Device Typical Rating (Watts)
Cell Phone charger 2-6W Light bulb - fluorescent 10W-15W Light bulb- incandescent 40W - 60W Radio 5-70W TV 20-100W Fan 10-30W Computer 80-150W Laptop Computer 20-80W Computer Printer 100-150W Coffee maker 1200W Iron for clothes 1500W Refrigerator (12 cu.ft) 90-400W, 1-4hr/day Drill (1/2”) 700W Circular saw 900W
Ø Use these typical values to estimate power in your own community or application
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Group Exercise & Discussion
Ø Estimate the demand in your village at night if every house uses 3 light bulbs, and one house out of every 5 uses a color television. Start by documenting how many houses are in your village, and assume the use of old 60W incandescent light bulb.
Ø What can be done to provide as much light in each house while using less electricity?
Ø In your village, how many people maximum could use an electrical iron at the same time during the day?
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