Heat loss Give step-by-step calculation and explanationConsider a person sitting nude on a beach in Florida. On a sunny day, visible radiation energy from thesun is absorbed by the person at a rate of 30 kcal/h or 34.9 W. The air temperature is a warm 30 °C andthe individual’s skin temperature is 32 °C. The effective body surface exposed to the sun is 0.9 m².(Assume this same area for sun absorption, radiative transfer, and convective loss. Is this a goodassumption?)a. Find the net energy gain or loss from thermal radiation each hour. (Assume thermal radiativegain and loss according to the equation 6.51 in Herman and an emissivity of 1.) Answeer a 21kcal/hror 2YD-(4).Eguadion(6.51)- (40 Tin)Eskin Askin (Tskin – Troom)dt= (4 x 5.67 x 10¬8 w/m²–K*x (307 K)³)€skin Aşkin (Tskin – Troom) -(6.52)b. If there is a 4 m/s breeze, find the energy lost by convection each hour. (Use Eq. 6.61 with eq.6.63.) Àns48 kcal /hr or 24W1Equationh.(Tskin – Tair),(6.61)Adthe10.45 – w + 10w0.5(6.63)-c. If the individual’s metabolic rate is 80 kcal/h (93.0 W) and breathing accounts for a loss of 10kcal/h (11.6 W), how much additional heat must be lost by evaporation to keep the body coretemperature constant? Aas = 43 kcal/h or 50wd. How would you suggest that he loses this energy? Explain your answer clearly and convincingly.

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Consider a person sitting nude on a beach in Florida. On a sunny day, visible radiation energy from the sun is absorbed by the person at a rate of 30 kcal/h or 34.9 W. The air temperature is a warm 30 °C and the individual's skin temperature is 32 °C. The effective body surface exposed to the sun is 0.9 m². (Assume this same area for sun absorption, radiative transfer, and convective loss. Is this a good assumption?) a. Find the net energy gain or loss from thermal radiation each hour. (Assume thermal radiative gain and loss according to the equation 6.51 in Herman and an emissivity of 1.) Anseera 21kcal/hr or 24 -(). Eguadion (6.51) - (40Tin)Eskin Askin (Tskin – Troom) dt = (4 x 5.67 × 10-8 w/m²–Kª x (307 K)')eskin Aşkin (Tskin – Troom). (6.52) b. If there is a 4 m/s breeze, find the energy lost by convection each hour. (Use Eq. 6.61 with eq. 6.63.) Àns = 48 kcal/hr or 24W 1 (dQ Equation = h.(Tskin – Tair), (6.61) - - A dt he 10.45 – w + 10w" ,0.5 (6.63) c. If the individual's metabolic rate is 80 kcal/h (93.0 W) and breathing accounts for a loss of 10 kcal/h (11.6 W), how much additional heat must be lost by evaporation to keep the body core temperature constant? Ans = 43 kal/h or sow

Consider a person sitting nude on a beach in Florida. On a sunny day, visible radiation energy from the sun is absorbed by the person at a rate of 30 kcal/h or 34.9 W. The air temperature is a warm 30 °C and the individual's skin temperature is 32 °C. The effective body surface exposed to the sun is 0.9 m². (Assume this same area for sun absorption, radiative transfer, and convective loss. Is this a good assumption?) a. Find the net energy gain or loss from thermal radiation each hour. (Assume thermal radiative gain and loss according to the equation 6.51 in Herman and an emissivity of 1.) Anseera 21kcal/hr or 24 -(). Eguadion (6.51) - (40Tin)Eskin Askin (Tskin – Troom) dt = (4 x 5.67 × 10-8 w/m²–Kª x (307 K)')eskin Aşkin (Tskin – Troom). (6.52) b. If there is a 4 m/s breeze, find the energy lost by convection each hour. (Use Eq. 6.61 with eq. 6.63.) Àns = 48 kcal/hr or 24W 1 (dQ Equation = h.(Tskin – Tair), (6.61) - - A dt he 10.45 – w + 10w" ,0.5 (6.63) c. If the individual's metabolic rate is 80 kcal/h (93.0 W) and breathing accounts for a loss of 10 kcal/h (11.6 W), how much additional heat must be lost by evaporation to keep the body core temperature constant? Ans = 43 kal/h or sow

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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