The maximum amount of water an adult in temperate climates can perspire in one h

Question

The maximum amount of water an adult in temperate climates can perspire in one hour is typically 1.8L degree C , the emissivity is 0.23. What is the surface area of the filament? W . At the filamenta??s temperature of 1500 ? C Lv = 24 X 10^5 J/Kg . The glowing filament in a lamp is radiating energy at a rate of 60 W L/hr . At what rate, in watts, is energy being removed when perspiring that rapidly? Assume all of the perspired water evaporates. At body temperature, the heat of vaporization of water is L v =24?10 5 J/kg L . However, after several weeks in a tropical climate the body can adapt, increasing the maximum perspiration rate to 3.5L/hr

Explanation / Answer

You are given that how much heat is removed by one kg of water (24 x 10^2 J) and are given how much water is there in 1 second (3.5 L in 1 hr so 3.5 / 3600 = 0.000972 L in 1 s) and you have to find how much heat is removed in 1 second. It's just a simple math question.

R = rate of removal of heat = 2400000 J/kg x 0.000972 kg /s (1 L of water = 1 kg of water)

= 2 333.33 J/s or watt

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