Which kinds of heat transfer (radiation, convection and evaporation) from a huma
ID: 1885561 • Letter: W
Question
Which kinds of heat transfer (radiation, convection and evaporation) from a human body are dominant when the room temperature is a.comfortable, b.warm and c.hot? Explain why?”Not very long answers, and don’t write for hand Plz”
Which kinds of heat transfer (radiation, convection and evaporation) from a human body are dominant when the room temperature is a.comfortable, b.warm and c.hot? Explain why?
”Not very long answers, and don’t write for hand Plz”
”Not very long answers, and don’t write for hand Plz”
Explanation / Answer
Convection relies on the flow of a fluid to transport heat from the object being cooled to the surrounding environment. In free convection, this fluid motion is the result of the buoyancy of warmer fluid in the cooler surrounding fluid. If there is an externally imposed flow, such as a wind, the convective rate is enhanced. At the very least, heat will be removed at the rate due to free convection.Convection accounts for about 1/3 the thermal loss of the human body in cool, still air.
The radiation heat loss for each part normally decreases as the operative temperature increases. The radiation heat losses of thigh and leg change greater with the operative temperature than those of the other parts, because the areas of thigh and leg are bigger than the other parts. In 37 °C, the radiation heat loss for the most parts is less than zero, and the heat loss becomes heat gain for the local body.
The local heat losses show that the radiation and convection heat losses are mainly affected by the area of local body, and the heat loss of the thigh is the most in the ten parts. The evaporation heat loss is mainly affected by the distribution of sweat gland, and the heat loss of the chest is the most. The total heat loss of the local body shows that in low temperature, the thigh, leg and chest have much heat loss, while in high temperature, the chest, abdomen, thigh and head have great heat loss, which are useful for clothing design. The heat losses of the whole body show that as the operative temperature increases, the radiation and convection heat losses decrease, the heat losses of conduction, respiration, and diffusion are almost constant, and the evaporation heat loss increases
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