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Posted by rjensen on June 19, 2007, 2:14 am
All
I recently installed an on-demand hot water heater and use it for both
domestic and space heating. Details are in the document at
www.consol.ca/downloads/Dual_heating_system.pdf
I would appreciate your comments on this article.
Please send your comments via email as I do not subscribe to this
newsgroup.
Thanks!
Roy Jensen
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Posted by mm on June 19, 2007, 3:00 am
On Mon, 18 Jun 2007 23:14:19 -0700, rjensen@consol.ca wrote:
show/hide quoted text
>All
>I recently installed an on-demand hot water heater and use it for both
>domestic and space heating. Details are in the document at
>www.consol.ca/downloads/Dual_heating_system.pdf
>I would appreciate your comments on this article.
For what purpose?
show/hide quoted text
>Please send your comments via email as I do not subscribe to this
>newsgroup.
>Thanks!
Don't thank us too soon. It's hard enough to get people to read a pdf
file, and then all you want are comments? Don't you have any
questions? What are you trying to do and what problems do you need to
solve in order to do it?
And then you want people to email you. No one will do that but me,
but I don't like pdf's and I'm not going to read it.
Subscribing to a newsgroup is not as difficult as hanging from a rope
and rescuing a woman from an active volcano. If Indiana Jones can do
that, you can subscribe to a newsgroup.
P&M
show/hide quoted text
>Roy Jensen
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Posted by Proctologically Violated©® on June 19, 2007, 3:16 am
I wonder why a guy installs a heating system, writes a whole goddamm
analysis about it, and then crows about not being remunerated.
Sheeit, iffin I'm gonna write a whole big shpiel about sumpn, I'd wanna be
remunerated....
Inyway, after all his analysis/crowing, his own table shows efficiencies no
greater than many other systems.
His claim of 100% efficiency in the text is 1. impossible and 2.
inconsistent with his own table, of 84-96%.
Personally, I don't think any gas-fired system can come anywhere near 90%,
but I could be wrong.
In addition, the btu/hr of 200,000 is fairly whopping. My near-5,000 sq ft
hovel is heated by a 70,000 btu gas forced-air system, and cooled by a 5 ton
(60,000 btu) system. Sep. Sears HWT, gas fired.
I wonder how efficient how such a 200K system can be so efficient, esp. when
the very premise of "on-demand" requires fairly high "instantaneous" energy
input.
I gather that what is nice about this On-demand stuff is that you never have
to worry about running out of HW, which, if you got a showering SIL like I
got, can come in handy. I'm thinking of making her shower coin-operated.
Anyway, not saying on-demand is not efficient or a good idea, just wonder...
If I had my druthers, I'd get rid of forced air, and do a nice hot
water/chilled water heating/A/C system, like what you see in some high-rise
condos. Quiet, easily zoned, no big-assed noisy fan motors/duct work, etc.
You then have various choices of how to heat/chill the water for the system.
Anyway, semi-inneresting read, if a little dense and hard to follow.
Mr. Jensen is obviously perty pleased with hisself.
If he deigns to come back here, he should post to alt.hvac. Hope he's got
thick skin. :)
--
------
Mr. P.V.'d (formerly Droll Troll), Yonkers, NY
Stop Corruption in Congress & Send the Ultimate Message:
Absolutely Vote, but NOT for a Democrat or a Republican.
Ending Corruption in Congress is the *Single Best Way*
to Materially Improve Your Family's Life.
The Solution is so simple--and inexpensive!
entropic3.14decay at optonline2.718 dot net; remove pi and e to reply--ie,
all d'numbuhs
show/hide quoted text
> All
> I recently installed an on-demand hot water heater and use it for both
> domestic and space heating. Details are in the document at
> www.consol.ca/downloads/Dual_heating_system.pdf
> I would appreciate your comments on this article.
> Please send your comments via email as I do not subscribe to this
> newsgroup.
> Thanks!
> Roy Jensen
>
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Posted by rjensen on June 22, 2007, 1:00 am
Yeah, I have thick skin. To answer your questions:
show/hide quoted text
> ...then crows about not being remunerated.
Because I want to emphasize that it is not a biased evaluation.
show/hide quoted text
> His claim of 100% efficiency in the text is 1. impossible and 2.
> inconsistent with his own table, of 84-96%.
The fan-coil is not listed in Table 1. The fan-coil IS 100 % efficient
because there is no heat loss. Any residual heat is simply heats the
room with the fan-coil.
show/hide quoted text
> Personally, I don't think any gas-fired system can come anywhere near 90%,
> but I could be wrong.
Yep, you're wrong.
show/hide quoted text
> In addition, the btu/hr of 200,000 is fairly whopping. My near-5,000 sq ft
> hovel is heated by a 70,000 btu gas forced-air system, and cooled by a 5 ton
> (60,000 btu) system. Sep. Sears HWT, gas fired.
WOW, an EXECELLENT observation. Which, btw, is what got me thinking
about using the on-demand unit to heat the house.
show/hide quoted text
> I wonder how efficient how such a 200K system can be so efficient, esp. when
> the very premise of "on-demand" requires fairly high "instantaneous" energy
> input.
Up to 96 % efficient, according to the manufacturers.
show/hide quoted text
> Anyway, semi-inneresting read, if a little dense and hard to follow.
Thanks. Where is it hard to follow?
show/hide quoted text
> Mr.Jensen is obviously perty pleased with hisself.
Not particularly. Thought others might like the idea.
And btw, it is DR. JENSEN. (PhD in physical chemistry, that I am
pleased about!)
show/hide quoted text
> If he deigns to come back here, he should post to alt.hvac. Hope he's got
> thick skin. :)
Roy Jensen
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Posted by Bob F on June 22, 2007, 2:24 am
show/hide quoted text
> Yeah, I have thick skin. To answer your questions:
>> ...then crows about not being remunerated.
> Because I want to emphasize that it is not a biased evaluation.
>> His claim of 100% efficiency in the text is 1. impossible and 2.
>> inconsistent with his own table, of 84-96%.
> The fan-coil is not listed in Table 1. The fan-coil IS 100 %
> efficient
> because there is no heat loss. Any residual heat is simply heats the
> room with the fan-coil.
But as the water temp of the returning water increases, the efficiency
of the water heater decreases. More heat goes out the stack because
the differential is less.
Bob
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>I recently installed an on-demand hot water heater and use it for both
>domestic and space heating. Details are in the document at
>www.consol.ca/downloads/Dual_heating_system.pdf
>I would appreciate your comments on this article.