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Calculate the overall heat transfer coefficient for the following: 4. hi 1 100 W/(m2-K) 11/4-standard type...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
.0 W/m2-K, including the effec An anaerobic digester cover has an overall heat transfer coefficient U...
.0 W/m2-K, including the effec An anaerobic digester cover has an overall heat transfer coefficient U of 1.0 W/m2.K, including the effects of convection and radiation. The cover has a surface area of 325 m2. The temperature inside the digester is 33°C and the outside air temperature is 0.0°C. What is the rate of heat loss from the digester through the cover? Report your answer in kW, to the nearest 0.1 kW, without entering the units.
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...
A) Determine the convection heat transfer coefficient for the flow of air. [W/m2·°C] B) Determine the...
A) Determine the convection
heat transfer coefficient for the flow of air.
[W/m2·°C]
B) Determine the convection heat transfer coefficient for water.
[W/m2·°C]
The velocity of the fluid is 9 m/s in an 8-cm diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. Water or Air D 8 cm L=7 m Given: The properties of air at 25°C are: k 0.02551 W/m."C v 1.562 10-5 m2/s Pr =...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1 , 20 mm thick), fibreglass insulation (k = 0.045 W m-1 K -1 , 70 mm thick) and plasterboard (interior) (k = 0.25 W m-1 K -1 , 10 mm thick). Determine the total heat loss through the wall when the inside temperature is 20 °C, the outside temperature is -10 °C, the inside heat transfer coefficient is 15 W m-2 K -1, and...
Problem 1. (30 points) A double-pipe heat exchanger is used to condense steam at 7370 N/m2....
Problem 1. (30 points) A double-pipe heat exchanger is used to condense steam at 7370 N/m2. Water at an average bulk temperature of 10°C flows at 2.50 m/s through the inner pipe. which is made of copper and has a 2.54-cm ID and a 3.05-cm OD. Steam at its saturation temperature flows in the annulus formed between the outer surface of the inner pipe and an outer pipe of 5.08-cm-ID. The average heat transfer coefficient of the condensing steam is...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
Problem 4: Heat Exchangers Analysis (25 points) A counterflow plate-type heat exchanger as shown in the...
Problem 4: Heat Exchangers Analysis (25 points) A counterflow plate-type heat exchanger as shown in the figure below is used to cool propane fuel W 50 mm H 25 mm Saturated Vapor propane Thickness t =5 mm H 25 mm Cooling water Length L The flow rate of the cooling water is 0.2 kg/s, while the flow of the propane is 0.1 kg/s. The water enters the heat exchanger at a temperature of 20°C while the propane enters at its...
can you solve only last 4 questions Q3. Oil of unknown properties is heated in a...
can you solve only last 4
questions
Q3. Oil of unknown properties is heated in a shell-and-tube heat exchanger with one shell pass and 20 tube passes. The oil flows through the shell, and hot water flows inside the single copper tube that has an inner diameter of 20 mm, a wall thickness of 2 mm, and a length of 3 m per pass. The water enters at 360 Kat a mass flow rate of 0.2 kg/s and leaves at...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
Question Water at an average temperature of 110°C and an average velocity of 3.5 m/s flows through a 5-m-long Beryllium Copper (k-66 w/m.k) tube merge in a boiling water tank. Do NOT ignore the wall resistance. The inner and outer diameters of the tube are Di 1.0 cm and Do 2 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho- 8400 W/m2.K, a) Determine the overall heat...
.0 W/m2-K, including the effec An anaerobic digester cover has an overall heat transfer coefficient U of 1.0 W/m2.K, including the effects of convection and radiation. The cover has a surface area of 325 m2. The temperature inside the digester is 33°C and the outside air temperature is 0.0°C. What is the rate of heat loss from the digester through the cover? Report your answer in kW, to the nearest 0.1 kW, without entering the units.
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...
A) Determine the convection
heat transfer coefficient for the flow of air.
[W/m2·°C]
B) Determine the convection heat transfer coefficient for water.
[W/m2·°C]
The velocity of the fluid is 9 m/s in an 8-cm diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. Water or Air D 8 cm L=7 m Given: The properties of air at 25°C are: k 0.02551 W/m."C v 1.562 10-5 m2/s Pr =...
Problem 1. (30 points) A double-pipe heat exchanger is used to condense steam at 7370 N/m2. Water at an average bulk temperature of 10°C flows at 2.50 m/s through the inner pipe. which is made of copper and has a 2.54-cm ID and a 3.05-cm OD. Steam at its saturation temperature flows in the annulus formed between the outer surface of the inner pipe and an outer pipe of 5.08-cm-ID. The average heat transfer coefficient of the condensing steam is...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
Problem 4: Heat Exchangers Analysis (25 points) A counterflow plate-type heat exchanger as shown in the figure below is used to cool propane fuel W 50 mm H 25 mm Saturated Vapor propane Thickness t =5 mm H 25 mm Cooling water Length L The flow rate of the cooling water is 0.2 kg/s, while the flow of the propane is 0.1 kg/s. The water enters the heat exchanger at a temperature of 20°C while the propane enters at its...
can you solve only last 4
questions
Q3. Oil of unknown properties is heated in a shell-and-tube heat exchanger with one shell pass and 20 tube passes. The oil flows through the shell, and hot water flows inside the single copper tube that has an inner diameter of 20 mm, a wall thickness of 2 mm, and a length of 3 m per pass. The water enters at 360 Kat a mass flow rate of 0.2 kg/s and leaves at...
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