CT108 – Energy Audit Assignment
Top Down And Bottom Up
The Top Down Approach
The “top down” approach assesses the total energy inputs which are typically given as using my annual electricity bill to
calculate 20 cents /kWhr as a conversion. In the same vein, I will be using my annual heating oil bill and calculating 65
cent per litre for my heating oil.
The Bottom Up Approach
This approach requires a detailed analysis of the principal sources of energy usage in my home. The Bottom Up
approach will also tie into my Website created using Javascript to effectively read in data and give me statistical and
analytical information which will give me a good idea about how energy is being used in my home.
My Formula for working out Electrical
• (Wattage × Hours Used Per Day X Days Per
Year) / 1000
• So, for example, my 200w personal computer
(K45 Shuttle) will use:
• (200 Watts × 4 hours/day × 360
days/year) ÷ 1000
= 288 kWh × 20 cents/kWh
= E57.60 Per Year To Run
My Formula for working out Oil
• 1000L oil / 3 Radiators = 333 Litres of oil per
radiator per year.
• 4h per day usage X 360 = 1440 hours worth of
oil usage.
What I Hope To Learn / Explore From
This Assignment:
• I hope to be able to calculate (with some degree of
closeness) my house’ entire yearly energy consumption,
and that will relate to how much my annual heating and
fuel bill actually is. In other words, by nominating all
electrical appliances in my home, (and discovering their
wattage and power consumption) and calculating how
much I use them on a daily, weekly, and eventual annual
basis, I hope to come to a conclusion (kWh’s of energy
used, along with a monetary value for that) which is close
to the amount I am actually charged by the ESB and my oil
company. I also hope to learn which appliances are the
most power consuming within my home. Ultimately, by
finding this out on an overview level, I can attempt to use
them less, or even more wisely.
My ESB Bill VS Average
My Home – Cost Of Energy Per Room

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