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Bharat812
10-01-2011, 11:17 AM
If let say a hot body at 60 degC is placed in closed room and the temp. remains const. for 1 Hr. While calculating heat load of a room, how will acount for the hot body?

Tesla
10-01-2011, 12:23 PM
A hot body of what? and a mass of how much? Then which remains constant - the room temp or the body?
Please enlighten us for an in depth answer to your stars from refrigeration astrology (joke) lol

Bharat812
10-01-2011, 12:35 PM
body can be anything..a lump mass at 60 degC. temp remains constant for 1Hr...

NoNickName
10-01-2011, 12:52 PM
Depends on the heat transfer property of the body. Metal has a higher heat exchange than let's say water.
Your question has no answers.

Tesla
10-01-2011, 01:12 PM
Hi Bharat812
What we need is the type of body so we can work out how much heat will be transferred (we will apply the specific heat capacity of the substance for calculation multiplied by the mass) then we also will require the temperature of the room for the temperature difference to apply calculation. Also please tell us which remains constant - we must assume the room because I do not know what would remain at 60°C with out an energy source.

Bharat812
10-01-2011, 01:34 PM
I m just asking the base calculations or in simple terms formula for such type...Only Radiation equation is applied or any thing else needs to be included?

desA
10-01-2011, 03:53 PM
If the internal body remains at same mass & temperature, then no heat is transferred to the room, or its contents, during this period.

The body may safely be ignored.

A truly amazing 'body' by the way.

Tesla
10-01-2011, 04:02 PM
Q = M*SHC*TD
Q = Quantity of heat
M = Mass
SHC = Specific Heat Capacity
TD = Temperature Differance
If you search our forum you will find many examples of these calculations to help with your problem.

Watt = Joule/second

radiation?

Sandro Baptista
10-01-2011, 04:06 PM
Lets assume that the body have an energy source on them...so stopping that discussion :)

Despite the radiation heat which it could be very important (if it could be considered a "black body" aprox. and depending on the surroundings temperature) also the convective effect may have some importance.

Anyway the radiation surface of that body will influence the heat release.

NoNickName
10-01-2011, 06:16 PM
If the internal body remains at same mass & temperature, then no heat is transferred to the room, or its contents, during this period.


Not really. It just means that the heat balance of the room is nil, but not that the body doesn't transfer heat.