The surface area of an average naked human adult is 2.2 m^2 and the average skin...
The surface area of an average naked human adult is
2.2 m^2 and the average skin temperature is 33 degrees C. The
emissivity of human skin is 0.95. Determine the radiation heat
transfer rate from the human to the walls of a room if they are at
22 degrees C. This is why naked person feels chilly at room
temperature.
Homework Answers
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The surface area of an average naked human adult is
2.2 m^2 and the average skin...
10. (10pts) The surface area of an adult human being is 1,8 m2. Suppose a person with a skin tem ...
10. (10pts) The surface area of an adult human being is 1,8 m2. Suppose a person with a skin tem omperature of 34°C is standing with bare skin in a room where the air is 22°C but the walls are 21°C. (ơ 5.67" 104 J / (sm"к"). There is a "dead ai lay ran around you next to your skin that acts as insulation. This dead-air layer is 5.0 mm thick. a) Draw b) What is the person's rate of...
3. A water heater is covered with insulation boards over a total surface area of 3...
3. A water heater is covered with insulation boards over a total surface area of 3 m. The board is 5.3 centimeter thick. The inside board surface is at 69'C, and the board material has a conductivity of 0.08 W/m-K. If the heat loss is 200 W, determine the outside surface temperature. Given A= 3m? T= 69°C Tonto? K= 0.08 W/mk Q=2oow 4. Determine the total rate of heat transfer from a person standing in a breezy room at 20°C...
Consider a person with a surface area of 2.00 m and a skin temperature of 33.0°C....
Consider a person with a surface area of 2.00 m and a skin temperature of 33.0°C. The person is in a room at 20.0°C. What is the net rate of heat transfer by radiation? Hint: See Example 12.23. Submit Request Answer
a person steps out of the shower and dries off. the person's skin with an emissivity...
a
person steps out of the shower and dries off. the person's skin
with an emissivity of 0.70 has a total area of 1.2 m^2 and a
temperature of 33°C. what is the net rate at which energy is lost
to the room through radiation by the naked person if the room
temperature is 24°C?
TIDLALLLL LA LILIILI JIAIL WHITUURE DOING WHAT PUU VUI "THEORY"), AND SHOW ALL WORK. 1. A person steps out of the shower and dries off....
11. With the window blinds closed, creepy Joey likes to stand naked in his living room...
11. With the window blinds closed, creepy Joey likes to stand naked in his living room for hours at a time. The surface of his body is 1.5m2, his skin temperature maintains a constant temperature of 34.0°C and his skin emissivity is 0.62. a. Calculate the rate of heat loss due to radiative heat transfer from Joey's skin surface. b. It turns out that, for comfort, Joey keeps his living room at a constant room temperature of 23.0°C. Calculate the...
The total surface area of the human body is 1.20 m2 and the surface temperature is...
The total surface area of the human body is 1.20 m2 and the surface temperature is 30∘C=303∘K. If the surroundings are at a temperature of 6.0 ∘C , what is the net rate of heat loss from the body by radiation? The emissivity of the body is very close to unity, irrespective of skin pigmentation. Express your answer using two significant figures.
An animal's body has a skin temperature of 33 °C and is the room temperature where...
An animal's body has a skin temperature of 33 °C and is the room temperature where the walls are at temperature 29 °C. If the emissivity is 1 and the body area is 1.5 m2. What is the rate of heat transfer by radiation? ( Stefan-Boltzmann constant = 5.67 x 10 -8 J/s m?k4) 42 W 38 W 72 W O 54 W O 63 W
Radiation from the head is a major source of heat loss from the human body. Model...
Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the body's surface temperature is 36 ∘C , what is the net rate of heat loss on a chilly 5 ∘C day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95. Express your answer to two significant figures and include...
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...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of 32°C during operation. The temperature of ambient air is 22°C. Assuming the door has an emissivity of 0.8 and the surroundings are also at 22°C, determine the heat transfer by free convection and the heat transfer by radiation. 1) What is the volumetric thermal expansion coefficient of air at the film temperature outside the oven door, in 1/K? 2) What is the Rayleigh number...
10. (10pts) The surface area of an adult human being is 1,8 m2. Suppose a person with a skin tem omperature of 34°C is standing with bare skin in a room where the air is 22°C but the walls are 21°C. (ơ 5.67" 104 J / (sm"к"). There is a "dead ai lay ran around you next to your skin that acts as insulation. This dead-air layer is 5.0 mm thick. a) Draw b) What is the person's rate of...
3. A water heater is covered with insulation boards over a total surface area of 3 m. The board is 5.3 centimeter thick. The inside board surface is at 69'C, and the board material has a conductivity of 0.08 W/m-K. If the heat loss is 200 W, determine the outside surface temperature. Given A= 3m? T= 69°C Tonto? K= 0.08 W/mk Q=2oow 4. Determine the total rate of heat transfer from a person standing in a breezy room at 20°C...
Consider a person with a surface area of 2.00 m and a skin temperature of 33.0°C. The person is in a room at 20.0°C. What is the net rate of heat transfer by radiation? Hint: See Example 12.23. Submit Request Answer
a
person steps out of the shower and dries off. the person's skin
with an emissivity of 0.70 has a total area of 1.2 m^2 and a
temperature of 33°C. what is the net rate at which energy is lost
to the room through radiation by the naked person if the room
temperature is 24°C?
TIDLALLLL LA LILIILI JIAIL WHITUURE DOING WHAT PUU VUI "THEORY"), AND SHOW ALL WORK. 1. A person steps out of the shower and dries off....
11. With the window blinds closed, creepy Joey likes to stand naked in his living room for hours at a time. The surface of his body is 1.5m2, his skin temperature maintains a constant temperature of 34.0°C and his skin emissivity is 0.62. a. Calculate the rate of heat loss due to radiative heat transfer from Joey's skin surface. b. It turns out that, for comfort, Joey keeps his living room at a constant room temperature of 23.0°C. Calculate the...
An animal's body has a skin temperature of 33 °C and is the room temperature where the walls are at temperature 29 °C. If the emissivity is 1 and the body area is 1.5 m2. What is the rate of heat transfer by radiation? ( Stefan-Boltzmann constant = 5.67 x 10 -8 J/s m?k4) 42 W 38 W 72 W O 54 W O 63 W
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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