The surface of a furnace wall is at a temperature of 1350oC. The outside wall temperature...
The surface of a furnace wall is at a temperature of 1350oC. The outside wall temperature is 42oC. The furnace wall is made of 25 cm of refractory material having a thermal conductivity of 1.4 W/moK. The outside wall is steel, 1 cm thick with thermal conductivity of 47 W/moK. Calculate the thickness in meters of brick to be installed in between the refractory material and steel if its thermal conductivity is 0.28 W/moK and the heat loss is not to exceed 750 W/m2.
. A counterflow heat exchanger is designed to cool 0.65 kg/sec of oil with specific heat Cp = 3.4 KJ/kgoK from 150oC to 70oC. Water for cooling, Cp = 4.18 KJ/kgoK is available at 20oC and flow rate of 0.6 kg/sec. Calculate the length of a 3.5 cm inside diameter tubing in meters. The overall coefficient of heat transfer is 90 W/m2 oK.
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The surface of a furnace wall is at a temperature of
1350oC. The outside wall temperature...
Question 11 (15 points) The wall of a liquid-to-gas heat exchanger has a surface area on...
Question 11 (15 points) The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m * 3.0 m) with a heat transfer coefficient of 255 W/m2 K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m * 3.0 m) with a heat transfer coefficient of 255 W/m2K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m long and the heat transfer...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m 3.0 m) with a heat transfer coefficient of 255 W/m2K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m long and the heat transfer coefficient...
The wall of a furnace consists of two parts, a ceramic brick lining (k=1.1 W/m C,....
The wall of a furnace consists of two parts, a ceramic brick lining (k=1.1 W/m C,. l=20 mm) and an outer steel wall (k=50 W/ m C, l=10 mm). The inner heat transfer coefficient is 29 W/ m2 C and the outer heat transfer coefficient is 14 W/ m2 C. Taking the bulk temperature of the furnace to be 1000 C and the air temperature outside the furnace as 15 C calculate the temperature of the outer steel wall exposed...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose wall...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
2. A separation column at a temperature of 100C is subjected for cooling for a certain...
2. A separation column at a temperature of 100C is subjected
for cooling for a certain period of time. If the separation column
is 1500 mm high and 18 cm in diameter, and eventually exposed to an
environment temperature of 35C, determine the following with a
neat diagram:
a) Heat Transfer Coefficient (in J/s m2C and kJ/s m2C)
b) Heat transfer Rate (in W and kW)
Assume the properties of air at mean temperature as density
(ρ) = 1.06 kg/m3,...
The hot combustible gasses of a furnace are separated from the ambient air and its surrounding,...
The hot combustible gasses of a furnace are separated from the ambient air and its surrounding, which are 28oC, by a brick wall 120 mm thick. The brick has a thermal conductivity of 1.23 W/m-oK and a surface emissivity of 0.82. At steady state conditions the outer surface temperature is 120oC. Air surface film conductance is 15 W/m2-oK. What is the total heat transmitted for 20 square meter area.The hot combustible gasses of a furnace are separated from the ambient...
A concrete wall of a house is 45 cm thick and has a surface area 20m...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
The heat exchanger in a heat lung machine is constructed so that blood flows through an...
The heat exchanger in a heat lung machine is constructed so
that blood flows through an array of tubes controlled temperature
water circulated through an outer exterior shell.
e heat exchanger in a heat lung machine is constructed so that blood flows through an array of tubes with controlled temperature water circulated through an outer exterior shell. Although the temperature of the blood varies as it passed through the heat exchanger, during the cool down cycle when a patient is...
Question 11 (15 points) The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m * 3.0 m) with a heat transfer coefficient of 255 W/m2 K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m * 3.0 m) with a heat transfer coefficient of 255 W/m2K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m long and the heat transfer...
The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6 m 3.0 m) with a heat transfer coefficient of 255 W/m2K. On the other side of the heat exchanger wall a gas flows, and the wall has 96 thin rectangular steel fins 0.5 cm thick and 1.25 cm high (k = 3 W/m K) as shown in the figure below. The fins are 3 m long and the heat transfer coefficient...
QUESTION 1 Quarter of the area of a 5m x 3m outside wall of a house is made of glass windows. The wall is 15 cm thick and has an average thermal conductivity of 0.8 W/m K. The window glass is 8 mm thick and has an average thermal conductivity of 0.15 W/m K. On a winter day the inside temperature of the wall and the glass is 20°C, and the outside air temperature is -10°C. The outside convection heat...
4- A steel strip of thickness 6-12 mm is annealed by passing it through a large fumace whose walls are maintained at a temperature Tw corresponding to that of combustion gases flowing through the fumace (Iw Tp). The stip, whose density, spcific thermal conductivity, and emissivity are 79 kg/m3, cp -640 J/kg K, k 30 W/m K and 0.7, respectively, is to be heated from 300°C to 600°C Furnace walls, Combustion gases For a unifom convection coefficient of h-100 W/m2...
2. A separation column at a temperature of 100C is subjected
for cooling for a certain period of time. If the separation column
is 1500 mm high and 18 cm in diameter, and eventually exposed to an
environment temperature of 35C, determine the following with a
neat diagram:
a) Heat Transfer Coefficient (in J/s m2C and kJ/s m2C)
b) Heat transfer Rate (in W and kW)
Assume the properties of air at mean temperature as density
(ρ) = 1.06 kg/m3,...
A concrete wall of a house is 45 cm thick and has a surface area 20m x 5 m. The inside temperature of the wall is 47 °C and the outside air temperature is 14 °C. Thermal conductivity of the concrete wall is 0.8 W/mK. Calculate the heat transfer rate through the wall by conduction and its thermal resistance.
The heat exchanger in a heat lung machine is constructed so
that blood flows through an array of tubes controlled temperature
water circulated through an outer exterior shell.
e heat exchanger in a heat lung machine is constructed so that blood flows through an array of tubes with controlled temperature water circulated through an outer exterior shell. Although the temperature of the blood varies as it passed through the heat exchanger, during the cool down cycle when a patient is...
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