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While running a 65 kg student generates additional thermal heat at a rate of 1200 W. To keep a constant body temperature of 37 "C, the heat has to be removed e.g. by sweating. a) How much water per minute has to evaporate from the skin of the student to keep a constant body temperature of 37 "C? Use heat of vaporization Lywater = 2260 kJ/kg. b) Assume that the cooling mechanisms fail and the student heats up. How long could the student run until irreversible body damage will occur at a body temperature of about 42 °C? Assume a specific heat of a human body of 3480 J/(kg K). Hint: You are given energy per time - you can e.g. define a certain time period for your calculations and then at the end devide the result by that period to get the required water per minute.

While running a 65 kg student generates additional thermal heat at a rate of 1200 W. To keep a constant body temperature of 37 "C, the heat has to be removed e.g. by sweating. a) How much water per minute has to evaporate from the skin of the student to keep a constant body temperature of 37 "C? Use heat of vaporization Lywater = 2260 kJ/kg. b) Assume that the cooling mechanisms fail and the student heats up. How long could the student run until irreversible body damage will occur at a body temperature of about 42 °C? Assume a specific heat of a human body of 3480 J/(kg K). Hint: You are given energy per time - you can e.g. define a certain time period for your calculations and then at the end devide the result by that period to get the required water per minute.

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Problem 5.3
While running a 65 kg student generates additional thermal heat at a rate of 1200 W. To keep a constant body temperature of 37 °C, the heat has to be removed e.g. by sweating. a) How much water per minute has to evaporate from the skin of the student to keep a constant body temperature of 37 °C? Use heat of vaporization Lywater = 2260 kJ/kg. b) Assume that the cooling mechanisms fail and the student heats up. How long could the student run until irreversible body damage will occur at a body temperature of about 42 °C? Assume a specific heat of a human body of 3480 J/(kg K). Hint: You are given energy per time - you can e.g. define a certain time period for your calculations and then at the end devide the result by that period to get the required water per minute.
Transcribed Image Text:While running a 65 kg student generates additional thermal heat at a rate of 1200 W. To keep a constant body temperature of 37 °C, the heat has to be removed e.g. by sweating. a) How much water per minute has to evaporate from the skin of the student to keep a constant body temperature of 37 °C? Use heat of vaporization Lywater = 2260 kJ/kg. b) Assume that the cooling mechanisms fail and the student heats up. How long could the student run until irreversible body damage will occur at a body temperature of about 42 °C? Assume a specific heat of a human body of 3480 J/(kg K). Hint: You are given energy per time - you can e.g. define a certain time period for your calculations and then at the end devide the result by that period to get the required water per minute.
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Hii, I want to ask how final body temperature was calculated in step 1?

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