Appliance energy saving

The reduced energy use never pays back the added purchase price on a new LCD TV.

How would you go about calculating that ?

First you need to know the power consumption of the 2 sets you want to compare. The label on the set indicates the max consumption, and figures can be calculated from those. If you want more precision, you'd hook the 2 upto an energy consumption meter (killawatt etc) and measure their consumption exactly.

Example:

Say a CRT TV eats 100w and you watch it for 2 hr per day. (I'm picking easy figures)

1. Consumption = 0.1kW x 2hrs = 0.2kWh per day = 73kWh / yr
2. Price of electricity = 12p/kWh
3. So annual energy cost = 73 x 12p = £8.76 / yr
4. If typical life expectancy of appliance = 8 yrs, thats £70 of electricity per life of the product.

Now compare an LCD with 70w consumption

1. elec cost = £6.13/yr = £49/ 8yrs
2. Difference = 70-49 = £21

The purchase price is greater than the electricity saving, so the LCD never pays its savings back.

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