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Author: Jeff D.Jeff D. Date: May 12, 2008 09:29
I'm considering installing electric baseboard heating in a building I just
finished, because I all ready have the heaters and adequate electrical
service to the building. The building is 20x30 and attached on the 30ft end
to an exiting building. The new building has R19 walls, R40 ceiling, and on
a slab with a perimeter thermal break. The only heat loss calculator I've
found online provided by a stand-alone heater manufacturer suggests I need
around a 4500kw heater. My area has around 5000 heating degree days. How do
I derive the electrical usage dollar estimate at .07/kwh.
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Author: phil-news-nospamphil-news-nospam Date: May 12, 2008 13:12
On Mon, 12 May 2008 11:29:48 -0500 Jeff D. hughes.net> wrote:
| I'm considering installing electric baseboard heating in a building I just
| finished, because I all ready have the heaters and adequate electrical
| service to the building. The building is 20x30 and attached on the 30ft end
| to an exiting building. The new building has R19 walls, R40 ceiling, and on
| a slab with a perimeter thermal break. The only heat loss calculator I've
| found online provided by a stand-alone heater manufacturer suggests I need
| around a 4500kw heater. My area has around 5000 heating degree days. How do
| I derive the electrical usage dollar estimate at .07/kwh.
Whatcha heating? An indoor football stadium?
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| Phil Howard KA9WGN (email for humans: first name in lower case at ipal.net) |
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Author: Gerald NewtonGerald Newton Date: May 12, 2008 16:20
On May 12, 8:29Â am, "Jeff D." hughes.net> wrote:> I'm considering installing electric baseboard heating in a building I just
> finished, because I all ready have the heaters and adequate electrical
> service to the building. The building is 20x30 and attached on the 30ft end
> to an exiting building. The new building has R19 walls, R40 ceiling, and on
> a slab with a perimeter thermal break. The only heat loss calculator I've
> found online provided by a stand-alone heater manufacturer suggests I need
> around a 4500kw heater. My area has around 5000 heating degree days. How do
> I derive the electrical usage dollar estimate at .07/kwh.
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Author: Jeff D.Jeff D. Date: May 13, 2008 07:32
Oops that's 4500W not 4500kw as you-all caught. I live in northern Indiana
and we get our power through and electric co-op utility. I'm trying to
understand how degree days and heat loss relate to power consumption. I also
have LPG to this building, but would have to purchase a heater of some type.
I think the recommendation I found for a LPG heater was in the 30,000btu
range. Unless cost is prohibitive I'd prefer the baseboard heat over LPG
because of the cleanliness and I don't have to punch a hole for a flue.
"Gerald Newton" hotmail.com> wrote in message
news:6e4282d4-c398-44af-85b5-4d2221e14d64@y22g2000prd.googlegroups.com...
On May 12, 8:29 am, "Jeff D." hughes.net> wrote:> I'm...
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Author: James SweetJames Sweet Date: May 13, 2008 09:34
Jeff D. wrote:
> Oops that's 4500W not 4500kw as you-all caught. I live in northern Indiana
> and we get our power through and electric co-op utility. I'm trying to
> understand how degree days and heat loss relate to power consumption. I also
> have LPG to this building, but would have to purchase a heater of some type.
> I think the recommendation I found for a LPG heater was in the 30,000btu
> range. Unless cost is prohibitive I'd prefer the baseboard heat over LPG
> because of the cleanliness and I don't have to punch a hole for a flue.
>
>
You can easily look up the BTUs per KW, I don't recall the value
offhand. Also keep in mind that most combustion heaters are 80%%, or more
recently 90%% efficient, so the BTU output will be lower than the rated
input. You could always install multiple baseboard heaters, put in one
or two, then if you find you need more heat, install additional heaters.
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Author: Gerald NewtonGerald Newton Date: May 13, 2008 11:44
On May 13, 6:45Â am, "Jeff D." hughes.net> wrote:> Oops that's 4500W not 4500kw as you-all caught. I live in northern Indiana
> and we get our power through and electric co-op utility. I'm trying to
> understand how degree days and heat loss relate to power consumption. I also
> have LPG to this building, but would have to purchase a heater of some type.
> I think the recommendation I found for a LPG heater was in the 30,000btu
> range. Unless cost is prohibitive I'd prefer the baseboard heat over LPG
> because of the cleanliness and I don't have to punch a hole for a flue.
>
> "Gerald Newton" hotmail.com> wrote in message
>
> news:6e4282d4-c398-44af-85b5-4d2221e14d64@y22g2000prd.googlegroups.com...
> On May 12, 8:29 am, "Jeff D." hughes.net> wrote:
>>> I'm considering installing electric baseboard heating in a building I just
>> finished, because I all ready have the heaters and adequate electrical
>> service to the building. The building is 20x30 and attached on the 30ft
>> end
>> to an exiting building. The new building has R19 walls, R40 ceiling, and
>> on ...
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Author: daestromdaestrom Date: May 13, 2008 14:00
> Oops that's 4500W not 4500kw as you-all caught. I live in northern Indiana
> and we get our power through and electric co-op utility. I'm trying to
> understand how degree days and heat loss relate to power consumption. I
> also have LPG to this building, but would have to purchase a heater of
> some type. I think the recommendation I found for a LPG heater was in the
> 30,000btu range. Unless cost is prohibitive I'd prefer the baseboard heat
> over LPG because of the cleanliness and I don't have to punch a hole for a
> flue.
>
>
Okay I know I'm being a bit pendantic here, but your heater is probably
rated not in BTU but in BTU/hr. BTU is a measure of energy, and BTU/hr is a
measure of power. Similarly W or kw is a measure of power.
Anyway, 1 kw is 3413 BTU/hr. So if you have an LPG heater rated at 30,000
BTU/hr, that's about equivalent to 8.8 kw.
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Author: Paul Hovnanian P.E.Paul Hovnanian P.E. Date: May 13, 2008 19:57
"Jeff D." wrote:
>
> I'm considering installing electric baseboard heating in a building I just
> finished, because I all ready have the heaters and adequate electrical
> service to the building. The building is 20x30 and attached on the 30ft end
> to an exiting building. The new building has R19 walls, R40 ceiling, and on
> a slab with a perimeter thermal break. The only heat loss calculator I've
> found online provided by a stand-alone heater manufacturer suggests I need
> around a 4500kw heater. My area has around 5000 heating degree days. How do
> I derive the electrical usage dollar estimate at .07/kwh.
The size of the heaters depends on the minimum design temp your local
codes require. You didn't state that, so I'm skipping it. A rough
estimate of energy use is:
ceiling: 600 s.f. / R40 = 15 BTU/hr-°F
unheated walls: 560 s.f. / R19 = 29.4 BTU/hr-°F
slab*: 600 s.f. / R10 = 60 BTU/hr-°F
----
104.4 BTU/hr-°F
104.4 BTU/hr-°F * 24 hr/day * 5000 degree-days = 1.25x10^7 BTU/year
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Author: phil-news-nospamphil-news-nospam Date: May 13, 2008 19:58
On Tue, 13 May 2008 09:45:41 -0500 Jeff D. hughes.net> wrote:
| Oops that's 4500W not 4500kw as you-all caught. I live in northern Indiana
| and we get our power through and electric co-op utility. I'm trying to
| understand how degree days and heat loss relate to power consumption. I also
| have LPG to this building, but would have to purchase a heater of some type.
| I think the recommendation I found for a LPG heater was in the 30,000btu
| range. Unless cost is prohibitive I'd prefer the baseboard heat over LPG
| because of the cleanliness and I don't have to punch a hole for a flue.
If I were building this from the ground up, I'd prefer to go with some kind
of water or mineral oil based thermal distribution system. A central heating
and cooling facility heats or chills the liquid. Then you can put the heat
and chilling source at a central point, maybe even in a separate building.
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