Re: [GBlist] Zero Energy House on Washington Mall (fwd)

["John Herbert" <john.herbert@kelcroft.com>]

Hi,

I would flag your "efficiency" figures quoted
below:

> Dr. Carmine F. Vasile wrote:
<snip>
> a)     $255 to $892 @ 8.5-cents/kWh, 100% conversion (electric);
> b)     $231 to $808 @ $1.72/Gallon, 55% conversion (oil);
> c)     $167 to $586 @ $1.25/Therm 8.5-cents/kWh, 76% conversion (gas).
<snip>

You have not stated any detail, however one
should note:

1. The efficiency for fuel oil can be quite 
similar to Gas, depending on the actual fuel 
oil burnt and the type of burner utilized. 
80% is achievable, however 75% more likely.

2. Electricity is not and will never be 100%
efficient. 90 - 95% is expected.

3. Gas maybe natural gas, town gas or LPG,
(I guess in the US you would be using 
LPG or Town gas).

All "efficiency" data provided by manufacturer's
is based on "new" purchase. Without regular 
maintenance efficiency will decline
rapidly.

Just my 2 cents

Regards,
John Herbert


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