Thank you Daox,
So
4 kWh in my example, is in fact a thermal energy, not an electric energy:
Quote:
a) electricity:
volume * (deliveryT-mainsT) / EF
100 * (45-10) / 1.0 = 3500 kcal
3500kcal / 860 ≈ 4 kWh of thermal energy?
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And what is 5kWh in my example:
Quote:
b) natural gas
volume * (deliveryT-mainsT) / EF
100 * (45-10) / 0.8 = 4375 kcal
4375kcal / 860 ≈ 5 kWh of ?
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?