How to do a home energy audit
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The Friends of NELHA presented a 3 part workshop called Energy Efficiency and Auditing Workshop in Hawaii. This slideshow presentation by Dr. Roderick Hinman is the first section which discusses what electricity is, how it is measured, and how you can measure the electrical loads of each appliance in your home to make decisions that can save on your home electric bill.
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How to do a home energy audit
- 1. Electrical Energy: What it is and how to measure it Rod Hinman Energy Efficiency Workshops, Spring 2009
- 16. Example * $0.34/kWh was the effective residential rate for my bill spanning most of September and a couple of days in October 60 60 1000 8.3 label Coffee maker TED measurement HELCO pamphlet HELCO pamphlet “ Kill-A-Watt” measurement HELCO pamphlet Data Source 496.9 = $170 at $0.34/kWh Total 1.3 90 14 CFL 11.8 540 22 32” LCD HDTV “off” 43.2 180 240 32” LCD HDTV on 120.6 Refrigerator 260.0 4500 Hot Water Heater kWh/mo. = W*H/1000 Hours in use/mo. Watts = V*A (usually 120V) Amps Appliance
- 20. AC Power Watts = Volts * Amps Note: power is not constant, but is always one direction
- 21. Units comparison =kiloWatt · Hour = 100 kWh * Hour * 100 hours kiloWatts 1 kW Electricity = Miles = 600 miles * Hour * 10 hours Miles Hour 60 mph Distance Quantity * Time Rate Measurement
Notas del editor
- Electrons are moving all the time, but haphazardly. Only when you have both moving electrons and a pressure behind them to you have power (Watts).
- Power is how fast we are using energy, or how fast we are filling that bucket in the previous slide. If we wash the dishes with the faucet turned on full blast, we are using water quickly. The wattage of a light bulb (say 100W) is telling you how fast you are using energy, not how bright it is, though they are related.
- Although called “current”, direct/alternating applies to the voltage as well.
- Energy is what accomplishes “useful work”. When you do a task, say washing your dishes, you use a certain amount of energy.
- Since Watts measure how fast we are using energy, energy is Watts times the amount of time the device is on. The basic unit we use is kilowatt-hours, or one thousand Watt-hours. A 10W compact fluorescent lamp running for 100 hours uses 1 kWh, as does a 100W incandescent lamp running for only 10 hours. Remember this term kilowatt-hour, as you will be seeing it a lot later today.
- The high level look is to measure your total use. To get more detail, you can break it down
- Measures whole house, but you can also use it to measure portions of your house. You can make a fun family activity out of it.
- Photos of three appliances: a 300W rice cooker, a DVD player, and a compact fluorescent lamp. Note that the DVD player uses 20W when on, but may still use 5W when “off”. The CFL has a current rating as well as a voltage rating, and 120V*0.2A=24W, not 14W. The lamp probably uses about 14W on average, but in some cases may draw 0.2A, so they are required to label it that way.
- I may want to edit this list somewhat
- Watts is still the product of Volts times Amps. For simple loads, the current (Amps) goes the same direction as the pressure.
- The purpose of this slide is to show that units of electrical energy and power are unlike other quantities we come across in daily life. Most rates include the nomenclature “per hour” or “per minute”. However, Watts are a rate, and to get the quantity of energy, you must multiply by time. Just as you would not ordinarily say “I drove 600 miles/hour last month,” you would also not typically say, “My refrigerator used 100 kilowatts last month.” Either of those statements might be true at a particular time during the month (though I doubt it), but are not reflective of the quantity used.