Homework Answers
UESTION 1: Energy balance (50 points) Humans are able to control their heat production rate their...
UESTION 1: Energy balance (50 points) Humans are able to control their heat production rate their heal production rate and heat loss rate to maintain a nearly constant Core temperature of T-37°C under a wide range of environmental conditi under a wide range of environmental conditions. This process is called on th e heut transfer between a human body and its between hum summ e focus on a layer in the eur am m ature 308 Considera per with a...
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...
Steady-State Conduction 3.25 Approximately 10° discrete electrical components can single integrated circuit (chip), with 30,000 W/m...
Steady-State Conduction 3.25 Approximately 10° discrete electrical components can single integrated circuit (chip), with 30,000 W/m 27 abe- be placed electrical heat dissipation The chip, which is very thin, is exposed to a tric liquid at its outer surface, with h, = 1000 W/m2 K and T inner surface. The thermal contact resistance between the chip and the board is 10 m K/W, and the board thickness and thermal conductivity are L and kp 1 W/m K, respectively. The other...
heat and mass transfer (20 points) Air at 25°C cools a 2170 cylindrical battery (with a diameter of 21 mm and a length of 70 mm) with a cross flow velocity of 6 m/s. a) Determine the average conv...
heat and mass transfer
(20 points) Air at 25°C cools a 2170 cylindrical battery (with a diameter of 21 mm and a length of 70 mm) with a cross flow velocity of 6 m/s. a) Determine the average convective heat transfer coefficient. (b) If the battery's internal heat generation is 5W and its thermal conductivity is 0.6 w/m-k, the determine the battery surface temperature and the maximum temperature in battery
(20 points) Air at 25°C cools a 2170 cylindrical battery...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
4. A silicon chip is attached with a copper pin fin in order to enhance the...
4. A silicon chip is attached with a copper pin fin in order to enhance the heat transfer. The square shape silicon chip has a width of W=10 mm on each side. The length and diameter of the copper pin are L=20 mm and D=4 mm, respectively. During the operation, the surface of the chip, as well as the base of the pin, are maintained at the temperature of To=375 K. The thermal conductivity of the copper pin fin is...
4. A silicon chip is attached with a copper pin fin in order to enhance the...
4. A silicon chip is attached with a copper pin fin in order to enhance the heat transfer. The square shape silicon chip has a width of W=10 mm on each side. The length and diameter of the copper pin are L=20 mm and D=4 mm, respectively. During the operation, the surface of the chip, as well as the base of the pin, are maintained at the temperature of To=375 K. The thermal conductivity of the copper pin fin is...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with a plastic insulation (thickness 2.0 mm; thermal conductivity: 0.4 W/m K) is exposed to air at 300 K. The heat loss per meter of wire generated is 200 W/m. Determine: ) Convective heat-transfer coefficient between the insulation and the surrounding air, h (25 pt) 2) Temperature of the insulation surface T2. (15 pt) HINT: T2 is a value between 320K and 400K To T2...
4. A silicon chip is attached with a copper pin fin in order to enhance the...
4. A silicon chip is attached with a copper pin fin in order to enhance the heat transfer. The square shape silicon chip has a width of W=10 mm on each side. The length and diameter of the copper pin are L=20 mm and D=4 mm, respectively. During the operation, the surface of the chip, as well as the base of the pin, are maintained at the temperature of To=375 K. The thermal conductivity of the copper pin fin is...
Homework 3 The figure below shows a very simple model of your skin on a very...
Homework 3 The figure below shows a very simple model of your skin on a very cold day in Wisconsin. The skin is composed of two lavers. The inner laver is the dermis which has a thickness of tha-3 mm and conductivity k- 0.32 W/m-K. The epidermis is the outer layer which has a thickness of thed0.12 mm and conductivity kod 0.14 W/m-K. The inner surface of the dermis is exposed to blood flow and therefore remains at Tiod34°C. The...
UESTION 1: Energy balance (50 points) Humans are able to control their heat production rate their heal production rate and heat loss rate to maintain a nearly constant Core temperature of T-37°C under a wide range of environmental conditi under a wide range of environmental conditions. This process is called on th e heut transfer between a human body and its between hum summ e focus on a layer in the eur am m ature 308 Considera per with a...
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...
Steady-State Conduction 3.25 Approximately 10° discrete electrical components can single integrated circuit (chip), with 30,000 W/m 27 abe- be placed electrical heat dissipation The chip, which is very thin, is exposed to a tric liquid at its outer surface, with h, = 1000 W/m2 K and T inner surface. The thermal contact resistance between the chip and the board is 10 m K/W, and the board thickness and thermal conductivity are L and kp 1 W/m K, respectively. The other...
heat and mass transfer
(20 points) Air at 25°C cools a 2170 cylindrical battery (with a diameter of 21 mm and a length of 70 mm) with a cross flow velocity of 6 m/s. a) Determine the average convective heat transfer coefficient. (b) If the battery's internal heat generation is 5W and its thermal conductivity is 0.6 w/m-k, the determine the battery surface temperature and the maximum temperature in battery
(20 points) Air at 25°C cools a 2170 cylindrical battery...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
4. A silicon chip is attached with a copper pin fin in order to enhance the heat transfer. The square shape silicon chip has a width of W=10 mm on each side. The length and diameter of the copper pin are L=20 mm and D=4 mm, respectively. During the operation, the surface of the chip, as well as the base of the pin, are maintained at the temperature of To=375 K. The thermal conductivity of the copper pin fin is...
4. A silicon chip is attached with a copper pin fin in order to enhance the heat transfer. The square shape silicon chip has a width of W=10 mm on each side. The length and diameter of the copper pin are L=20 mm and D=4 mm, respectively. During the operation, the surface of the chip, as well as the base of the pin, are maintained at the temperature of To=375 K. The thermal conductivity of the copper pin fin is...
III. Convective coefficient (40 pt). An electric wire having diameter of 6.0 mm and covered with a plastic insulation (thickness 2.0 mm; thermal conductivity: 0.4 W/m K) is exposed to air at 300 K. The heat loss per meter of wire generated is 200 W/m. Determine: ) Convective heat-transfer coefficient between the insulation and the surrounding air, h (25 pt) 2) Temperature of the insulation surface T2. (15 pt) HINT: T2 is a value between 320K and 400K To T2...
4. A silicon chip is attached with a copper pin fin in order to enhance the heat transfer. The square shape silicon chip has a width of W=10 mm on each side. The length and diameter of the copper pin are L=20 mm and D=4 mm, respectively. During the operation, the surface of the chip, as well as the base of the pin, are maintained at the temperature of To=375 K. The thermal conductivity of the copper pin fin is...
Homework 3 The figure below shows a very simple model of your skin on a very cold day in Wisconsin. The skin is composed of two lavers. The inner laver is the dermis which has a thickness of tha-3 mm and conductivity k- 0.32 W/m-K. The epidermis is the outer layer which has a thickness of thed0.12 mm and conductivity kod 0.14 W/m-K. The inner surface of the dermis is exposed to blood flow and therefore remains at Tiod34°C. The...
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