The discussion revolves around understanding convective heat transfer, specifically the implications of the convective heat transfer equation and its application to a scenario involving heating air above a hot surface. Participants are exploring the meaning of calculated values and the factors influencing heat transfer rates.
Participants do not appear to reach a consensus, as there is ongoing confusion about the implications of the calculations and the necessary factors for understanding convective heat transfer.
Limitations include the initial lack of detail regarding the specific scenario and assumptions about air mixing and heat capacity that may affect the interpretation of the results.
This discussion may be useful for individuals seeking to understand the fundamentals of convective heat transfer and the application of related equations in practical scenarios.
hc is called the heat transfer coefficient. This equation tells you how much heat is passing through the surface into the air above. If the air is pretty well mixed and you are heating it from the surface, you can determine the rate of temperature rise of the air by also knowing the mass and heat capacity of the air: $$MC_p\frac{dT_a}{dt}=h_cA(T_s-T_a)$$dmehling said:Maybe I don't quite understand the point of the equation: q = hc A dT . I plugged in values of hc = 100, A = .01, dT = 40 and the answer was q = 40 w per second. I just want to know what that answer tells me about how much a given volume of air above a hot surface will increase over a given amount of time. Are there other values and factors that I need to know in order to figure this out.