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The first thing to do is to try to get a ballpark estimate of the answer to this problem. According to Bird, Stewart, and Lightfoot, Transport Phenomena, typical values for heat transfer coefficients to gases in natural convection are 3-20 W/m^2K and in forced convection are 10-100 W/m^2K.
1 Answer. Sorted by: 2. Heat loss can be calculated using this equation. dQ dt = hA(Tsurface −Tfluid) d Q d t = h A (T s u r f a c e − T f l u i d) The difference between the water and air is likely to be h, the heat transfer coefficient. So the equation for air temperature calculation will be, hairA(37 −Tair) =hwaterA(37 − 11) h a i r ...
Here is a link to a calculator for heat loss through vaporization. Add the rate of heat loss from vaporization and radiation. Subtract that from the rate of thermal conductivity through the glass bottom, and see if it explains the temperature difference. Convection carries heat through the water, and once it leaves the surface, through the air.
The general procedure for the convection part for this type of pipe through room problem is: 1 - Calc. Coefficient of thermal expansion 2 - calc. Rayleigh number 3 - calc. Nusselt number 4 - calc. convective heat transfer coefficient 5 - calc. convective heat transfer. As for your main question, yes you do just add the heat transfer from the ...
For the second part of your question, you simply need to figure out the heat loss over 8 hours and supply that much heat to the air. Som practical issues that will complicate things: 1) Outside air temperature. The greater the difference, the faster the heat transfer (into or out of the room). 2) Solar heating of room's exterior walls.
That depends on what you mean by "heat". If you mean energy then you can calculate the energy required to cause the temperature change using the following equation: Energy = mass * specific heat capacity * temperature change (Q = mcθ).
$\begingroup$ To calculate this accurately you would need a load of information that you probably don't have (like the conductivity and heat capacity of each material involved). It would make more sense to take an experimental approach: just measure the temperature of the cakes every 1 hour, say, for a 12 hour period.
Jan 19, 2016 at 11:32. @CuriousOne - "rejected" is a common phrase for the heat that is released from the high temperature end of a heat pump to the environment. – Floris. Jan 19, 2016 at 16:33. @Floris: Didn't know that... some of the uses of the 1+ million words of the English language are still not in my repertoire, I guess (I would ...
Calculate the rate at which a hollow cylinder with a heating element inside will lose heat, specifically through both conduction and radiation. My goal is to find the temperature inside this cylinder. I realize that the total heat loss per second will be equal to the total amount of power that the heating element consumes.
Calculating heat loss to environment while an object is being heated up using Newton's Law of Cooling 0 Thermal Conductivity and Specific Heat Capacity: Calculating the Time Required for a Volume of Water to Cool
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