Alternative Power sources - Re: has anybody compiled a list of rapid return energy saving measures?

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Re: has anybody compiled a list of rapid return energy saving measures?

BobG

2005-08-17, 9:21 am

Anyone ever put a neon light across the hot water heater element to
actually observe when the hot water heater was operating? Whats the
duty cycle with NO HOT WATER USE during the day? Is this calculatable
given an R rating for the hw heater, and air and water temp?

nicksanspam@ece.villanova.edu

2005-08-17, 1:21 pm

BobG <bobgardner@aol.com> wrote:

>...Whats the duty cycle with NO HOT WATER USE during the day? Is this
>calculatable given an R rating for the hw heater, and air and water temp?

It's estimatable. A 25 ft^2 50 gallon tank with R10 insulation and 110 F
water in a 70 F room needs (110-70)50ft^2/R10 = 200 Btu/h, ie 59 watts,
ie a 100x59/4500 = 1.3% duty cycle with a 4500 watt heater.

Nick

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