Given human body core temperature=37C, skin surface temperature=33C, surface area of body=1.5m^2, and average thickness=1.0cm. Thermal...
Given human body core temperature=37C, skin surface temperature=33C, surface area of body=1.5m^2, and average thickness=1.0cm. Thermal conductivity is 0.2J/(s*m*degree). If one takes into account heat conduction through the skin as the only mechanism for energy dissipation from the body how long would it take to dissipate all the energy contained in a food consisting of 140 Calories?
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Given human body core temperature=37C, skin surface
temperature=33C, surface area of body=1.5m^2, and average
thickness=1.0cm. Thermal...
The core is at 37C , skin-fat layer thermal conductivity k_s = 0.3 W/m-K, skin emissivity...
The core is at 37C , skin-fat layer thermal conductivity k_s =
0.3 W/m-K, skin emissivity E_s = 0.95, skin-fat thickness l_s = 3
mm, and convection coefficient ℎ_air = 2 W/m2 -K. The jacket has
thermal conductivity of k_j = 0.5 W/m-K, jacket emissivity E_j =
0.02, and jacket thickness l_j = 2 cm.
a) Write two energy balances, one at the skin-jacket interface
and another at the jacket-air interface. Can any of the terms in
your energy balances...
Assume a human body has 100W(J/sec) of baseline metabolism rate (BMR), 1.5m^2 of surface area, and...
Assume a human body has 100W(J/sec) of baseline metabolism rate (BMR), 1.5m^2 of surface area, and emissivity of 0.9. Note that for homeostasis the thermal energy of BMR must be balanced with an equal loss of radiation energy to the environment. Ignore the convection in this problem. If one layer of cloth that has an emissivity of 0.9 as well is covered on the skin (34C), How thick a layer will we need of for the thermal conductivity, k, equal...
Calculate the rate of energy loss due to thermal radiation from an unclothed person if the average skin temperature is...
Calculate the rate of energy loss due to thermal radiation from an unclothed person if the average skin temperature is 37 °C and the room temperature is 20 °C. You may sume a total surface area of 1.5 m and a skin emissivity value of 0.9. How much energy (from food) must be consumed per day to compensate for this loss? If the person is surrounded by a layer of insulation of thickness 1.0 cm with a thermal conductivity of...
The core is at 37C , skin-fat layer thermal conductivity k_s =
0.3 W/m-K, skin emissivity E_s = 0.95, skin-fat thickness l_s = 3
mm, and convection coefficient ℎ_air = 2 W/m2 -K. The jacket has
thermal conductivity of k_j = 0.5 W/m-K, jacket emissivity E_j =
0.02, and jacket thickness l_j = 2 cm.
a) Write two energy balances, one at the skin-jacket interface
and another at the jacket-air interface. Can any of the terms in
your energy balances...
Calculate the rate of energy loss due to thermal radiation from an unclothed person if the average skin temperature is 37 °C and the room temperature is 20 °C. You may sume a total surface area of 1.5 m and a skin emissivity value of 0.9. How much energy (from food) must be consumed per day to compensate for this loss? If the person is surrounded by a layer of insulation of thickness 1.0 cm with a thermal conductivity of...
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