[Greenbuilding] Max Temp Storage Water

[Lawrence Lile]

Yep, translating all that math means savings from shutting off your water heater = Doodly Squat. 

--Lawrence Lile, 

> -----Original Message-----
> From: greenbuilding-bounces at lists.bioenergylists.org [mailto:greenbuilding-
> bounces at lists.bioenergylists.org] On Behalf Of nick pine
> Sent: Tuesday, February 08, 2011 3:09 PM
> To: greenbuilding at lists.bioenergylists.org
> Subject: Re: [Greenbuilding] Max Temp Storage Water
> 
> Lawrence Lile <LLile at projsolco.com> writes:
> 
> > Haudy sez:  There will still be a minor savings from turning off the
> > heater overnight...
> 
> > Yep, this is definitely minor, if your water heater cools off from
> > 120 to 115F and your house is 70F, then your losses go down 10% from
> > the standby loss...
> 
> If the standby loss is constant at 120 F for 12 hours and then drops
> to to 90% of that at 115 after 12 more hours, the savings is only
> 2.5%, right?
> 
> But a 50 gallon water heater that supplies 40K Btu/day with a 0.95 EF
> would only cool to 120-0.05x40K/(50x8.33)x12h/24h = 117.6, with a 1.2%
> savings..
> 
> Nick
> 
> 
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