Quote:
Originally Posted by Daniel Durrant
kg CO2/year from appliances and cooking:
99.9 x (TFA x N)0.4714 - (3.267 X TFA) + (32.23 x N) + 72.6
Where TFA is the Total Floor Area and N is the Number of Occupants
For TFA < 43m2; N = 1.46
TFA ≥ 43m2; N = 2.844 x (1 - exp(-0.000391 x TFA2))
I have cut and pasted this and the figure 0.4714 is written in smaller numbers as is 2 in m2 so I asume this means 0.4714 squared
I am using 70.98m2 as the floor area so need to understand what exp means to calculate number of occupants.
I also don't understand how to apply 0.4714
|
We can do math equations here using
latex which you don't need to know, but it will let you see if what we think you're saying is the same as what your problem is! So translating, it looks like your equation is:
Where:
Now, "exp(x)" is normally the natural logarithmic value
(which is approximately 2.71828...), so translating, that last line would be:
On a calculator built to do these kinds of computations, you need two operations. The first one is a key labeled something like
, and that's used for the part:
or in English "TFA times N to the 0.4714 power".
The other key you need is usually labeled
and is used for the
or in English "e to the -0.000391 times TFA squared power", and what you need to do is square TFA, multiply times -0.000391 and then hit the
key.
This may or may not have answered your question, but keep asking if it didn't!
Cooking with powered arrowroot,
Buffy
