I hold my hands up that I screwed the units early on and would like to point out that I'd already made clear that I was (now) aware of the relationship W=J/s - note also that my final calculations included kWh/day.
We've done that bit.
So NOW I'm asking if the numbers are correct, because...
Either way, 31.2 is the correct value to plug into the cost calculation considering gas usage is measured in kW, is it not? You said at the top that you "don't get what I get", but after that haven't debated this figure and it's still the only one I get:
i.e. 1300W = 1300J/s
1300 * 86400 =...
So heat energy required over 24 hours to cover the losses based on what's given IS 31kW? 1300 * 24 = 31,000
I make it that the 1300 is W/hr - or is that wrong?
This would go into heating cost calculation of 31kW*(£/kW / 0.8) = daily cost to cover losses ... The .8 accounting for efficiency...
I used Ht = U * A * dt and multiplied by 24 hours trying to calculate the heat input required to account for the losses.
So working towards "this much reduction in heat loss = this much reduction in heating cost".
As for the dt I was expecting that it could average out over time. I'm not...
Hi All,
Trying to get my head around some heat transfer calculations at the moment so I'm after a sanity check please on the daily heat loss in kW experienced through the following:
Material area: 28m2
U Value: 3.1
R Value: 0.32
Temp Dif: 15C
The info I have doesn't give the units, but given...
