Heating a room
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Posts: 46,084
Just wondering if anyone knows of a formula that relates how much the temp in
a room will increase, say, per unit time to things like the size of the room
and the power dissipated by an electric heater that is heating the room and
also ventilation eg. airflow?
Anything similar?
Any info will help
Thanks in advance,
Rob
[noparse][[/noparse]Non-text portions of this message have been removed]
a room will increase, say, per unit time to things like the size of the room
and the power dissipated by an electric heater that is heating the room and
also ventilation eg. airflow?
Anything similar?
Any info will help
Thanks in advance,
Rob
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
Don't know, but the biggest problem you got here is Heat Loss. R-Factor of
your Insulation, eh! And then there is the construction of the unit. Did
the carpenter make realy tight joints? Thickness of Drywall? Heat loss
around Electrical Boxes. (Actually I can feel the air coming out of the
wall outlets in my brother's house. Yikes!)
You might approach this problem in reverse. Heat room to known
temperature, track the temperature outside and figure out how long it takes
to drop temperature and then think about doing calculations. (if outside
temperature varies very much this might be difficult)
If I get more thoughts along these lines or find charts or program/s I'll
shoot you the info.
Best regards,
Original Message
From: <roboatboy@a...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, February 14, 2003 7:12 PM
Subject: [noparse][[/noparse]basicstamps] Heating a room
> Just wondering if anyone knows of a formula that relates how much the temp
in
> a room will increase, say, per unit time to things like the size of the
room
> and the power dissipated by an electric heater that is heating the room
and
> also ventilation eg. airflow?
> Anything similar?
> Any info will help
> Thanks in advance,
> Rob
>
>
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each wall, ceiling, floor, doors and windows. The outside temp and
required temp rise you require, and of course the volume of the room.
These are standard "double Glazing" and insulation calcs. Search the web
from room insulation products etc. You then can determine the energy
input required to raise a room above the outside ambient temp.
HTH
ROB
Original Message
From: roboatboy@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=59LqNL6LwBy_0Qy-W9aAPQAZuGDlkj7FqduQugzaQt2JhOcdBhGZXioqSFt3QpKDi1T0OgzvCekDRqg]roboatboy@a...[/url
Sent: 15 February 2003 02:12
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Heating a room
Just wondering if anyone knows of a formula that relates how much the
temp in
a room will increase, say, per unit time to things like the size of the
room
and the power dissipated by an electric heater that is heating the room
and
also ventilation eg. airflow?
Anything similar?
Any info will help
Thanks in advance,
Rob
[noparse][[/noparse]Non-text portions of this message have been removed]
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>Just wondering if anyone knows of a formula that relates how much the temp in
>a room will increase, say, per unit time to things like the size of the room
>and the power dissipated by an electric heater that is heating the room and
>also ventilation eg. airflow?
>Anything similar?
>Any info will help
>Thanks in advance,
>Rob
Rob -
Let me preface this by saying to get an accurate value, you need to know a lot
of information about the room, including the characteristics of the
building materials used in its construction. As stated by others, you also
need to
know the R-factors for the insulation, and type of glass (single, double
pane, etc) if there is any. You also need to know whether there is
insulation in the floor and/or ceiling. Once you have all the necessary
information, a "heat
loss" can be run on the room to determine the proper sized heater.
Short of that, if all you need is a quick approximation, cube the room (L x
W x H) and call that watts. That's an approximation of the heat loss of the
room
and will usually be about +/- 20 percent accurate for most newer homes. Areas
of extreme cold will need to be adjusted upwards. Continental USA only, YMMV !
Regards,
Bruce Bates
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http://www.diydata.com/planning/ch_design/example1_imperial.htm
Rob
(there seems to be a lot of Rob's in this forum !)
Original Message
From: roboatboy@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ccw4L-eQMXlQble3QNRZnMkS0-u970U1sjOkJaEcS-pTLof6c_MWdRdq2Qiqz6C1qm4QwEsXYq8]roboatboy@a...[/url
Sent: 15 February 2003 02:12
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Heating a room
Just wondering if anyone knows of a formula that relates how much the
temp in
a room will increase, say, per unit time to things like the size of the
room
and the power dissipated by an electric heater that is heating the room
and
also ventilation eg. airflow?
Anything similar?
Any info will help
Thanks in advance,
Rob
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complex. The heat equation, which can be used to calculate heat transfer is
a partial differential equation (PDE). Solving PDE's is something that only
a few people do in their paid time, and fewer do in their spare time. This
link explains the heat equation, and will help you understand why even the
approximations that others mention are complicated.
http://www.mathworks.com/access/helpdesk/help/toolbox/pde/2examp20.shtml
Original Message
From: Rob [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=JdmC_ZEG1DsN2s1c1H-7ZyWuiiKFEWrGBqQyrb_u5oqjgFOXC1smvULjWVpYxhwnVX_2-Tcb3HFHyvB75D2r53dJ]robbed666@b...[/url
Sent: Saturday, February 15, 2003 6:30 AM
To: basicstamps@yahoogroups.com
Subject: RE: [noparse][[/noparse]basicstamps] Heating a room
Try this site
http://www.diydata.com/planning/ch_design/example1_imperial.htm
Rob
(there seems to be a lot of Rob's in this forum !)
Original Message
From: roboatboy@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4vcxmWlLRv6GRAECRgW2VbZhs7Ka8FP6m1UzjdopyJTs96xd5JR-exejkWIlfJmgnNmoS0I_qo0]roboatboy@a...[/url
Sent: 15 February 2003 02:12
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Heating a room
Just wondering if anyone knows of a formula that relates how much the
temp in
a room will increase, say, per unit time to things like the size of the
room
and the power dissipated by an electric heater that is heating the room
and
also ventilation eg. airflow?
Anything similar?
Any info will help
Thanks in advance,
Rob
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> Just wondering if anyone knows of a formula that relates how much the temp in
> a room will increase, say, per unit time to things like the size of the room
> and the power dissipated by an electric heater that is heating the room and
> also ventilation eg. airflow?
> Anything similar?
> Any info will help
I'm afraid this is not a trivial problem that can be boiled down to a single
formula. Your best bet to begin to get a handle on such a computation would be
to review the ASHRE (American Society of Heating and Refridgeration Engineers)
handbooks - many big city libraries have them in the reference section.
Many factors are involved including the R value of walls, ceiling, and floor,
air infiltration, humidity, and the specific heat of the various materials in
the room and outside/inside temps to name a few.
If possible, you would probably be much better off determining a room's specific
responses experimentally rather than attempting to compute it.
Good Luck,
Michael Burr
Original Message
From: <roboatboy@a...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, February 15, 2003 04:12
Subject: [noparse][[/noparse]basicstamps] Heating a room
> Just wondering if anyone knows of a formula that relates how much the temp
in
> a room will increase, say, per unit time to things like the size of the
room
> and the power dissipated by an electric heater that is heating the room
and
> also ventilation eg. airflow?
> Anything similar?
> Any info will help
> Thanks in advance,
> Rob
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
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>
Heat in (BTU)
Heat Loss (BTU)
Mass in Room, air, walls,furniture
Really I would look at some Air Conditioning or Heating system pages for
determining unit size.
Bob
> [noparse][[/noparse]Original Message]
> From: <roboatboy@a...>
> To: <basicstamps@yahoogroups.com>
> Date: 2/14/2003 9:12:47 PM
> Subject: [noparse][[/noparse]basicstamps] Heating a room
>
> Just wondering if anyone knows of a formula that relates how much the
temp in
> a room will increase, say, per unit time to things like the size of the
room
> and the power dissipated by an electric heater that is heating the room
and
> also ventilation eg. airflow?
> Anything similar?
> Any info will help
> Thanks in advance,
> Rob
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
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>
Heat loss by exfiltration, air escaping.
Heat in from external sources like the sun thru a window.
heat gain from internal sources, computer, people, coffee machine.
Mass in room includes fast reacting mass such as metal cabinets, or
slow reacting mass like concret floors and plaster(drywall) walls.
Heat is a sloooow process. the room temperature may not change for
20 minutes after the heat source is turned on.
A simple test is to data log room temp with also monitoring the
outside air temp.
Dave
--- In basicstamps@yahoogroups.com, "ROBERT PHILLIPS" <robertp@v...>
wrote:
> Simple,
> Heat in (BTU)
> Heat Loss (BTU)
> Mass in Room, air, walls,furniture
>
> Really I would look at some Air Conditioning or Heating system
pages for
> determining unit size.
> Bob
>
>
> > [noparse][[/noparse]Original Message]
> > From: <roboatboy@a...>
> > To: <basicstamps@yahoogroups.com>
> > Date: 2/14/2003 9:12:47 PM
> > Subject: [noparse][[/noparse]basicstamps] Heating a room
> >
> > Just wondering if anyone knows of a formula that relates how much
the
> temp in
> > a room will increase, say, per unit time to things like the size
of the
> room
> > and the power dissipated by an electric heater that is heating
the room
> and
> > also ventilation eg. airflow?
> > Anything similar?
> > Any info will help
> > Thanks in advance,
> > Rob
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
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> >
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> >