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Extra credi current (t-1.0). Use a heat transfer coefficient of 95 kcal/m2-h- it: Calculate the surface...
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 1 Calculate the heat exchange surface area required in a heat exchanger comprised of tubes...
Question 1 Calculate the heat exchange surface area required in a heat exchanger comprised of tubes with an external diameter of 25 mm in order to cool a solution of ethyl alcohol (mass flow rate kg/h, heat capacity: 3.8 kJ/kg K) from 65 C to 40 °C using a water flow (mass flow rate: 22,680 kg/h, 24,948 , heat capacity: 4.18 kJ/kg K) entering at 5 °C. The overall heat transfer coefficient related to the outside tube surface is 566...
Help me!!!! Q2. Heat exchanger-NTU method (34 pt). An orange juice is being cooled from 85...
Help me!!!!
Q2. Heat exchanger-NTU method (34 pt). An orange juice is being cooled from 85 °C at a rate of 2000 kg/h in a counter-current heat exchanger by cold water. The juice has a specific heat of 3090 J/(kg.K). The cold water enters the heat exchanger at 8°C at a rate of 2950 kg/h、The overall heat transfer coefficient U-485 w/mK and the area A 4.2 m2. Assuming steady-state conditions, calculate: (a) the heat transfer rate (J/s), (b) the exit...
.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.
(40 pts) Shell-and-Tube Heat Exchanger to make Jell-O Cups A counter-current shell-and-tube heat exchanger is used...
(40 pts) Shell-and-Tube Heat Exchanger to make Jell-O Cups A counter-current shell-and-tube heat exchanger is used to heat Jell-O solution (water + gelatin) using saturated steam on the shell side. Jell-O solution must be heated to at least 80 oC, poured into individual plastic cups, and then cooled to make the solid Jell-O cups. The Jell-O solution is heated with steam that enters the shell at 2.0 bar (Tsteam = 120oC) and exits as a saturated liquid. At this temperature...
please solve these questions (a) Calculate the rate of heat transfer by radiation from a car...
please solve these questions
(a) Calculate the rate of heat transfer by radiation from a car radiator at 120 °C into a 55 °C environment, if the radiator has an emissivity of 0.75 and a 1.1-m surface area. Enter your answer in kilowatts. (b) Calculate the fraction of this radiative power to the total heat transfer by an automobile engine. Assume a mechanical horsepower of 200 hp (150 kW) and the efficienty of automobile engines as 25 %. Express your...
Page 2 of 3 Part II-Trivia (40%): check more than one if applicable Convective heat transfer...
Page 2 of 3 Part II-Trivia (40%): check more than one if applicable Convective heat transfer at a surface is affected by the air speed. Which of the following statements is true () Increasing the air speed increases convective heat transfer () the thickness of the air film (coefficient) increases with air speed a) ) the air film (coefficient) is like an insulating blanket over the surface () the air film (coefficient) offers resistance against heat transfer The Reynolds number...
An electric car travels at a constant highway speed of 60 mph, requiring a battery current...
An electric car travels at a constant highway speed of 60 mph, requiring a battery current draw of 50 A. The cooling system operates such that the average convection coefficient, h, is 25 W/m2 K. The coolant average temperature is 23°C. Suddenly a cooling system malfunction results in a decrease of the convection coefficient to 5 W/m2K. The pack has a heat transfer surface area of 1.2m2 and a mass of 50 kg. The pack specific heat is 600J/kg K...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assum...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
1. At an outdoor lot, there is a black-colored solar heat collection copper pipe. It is 50 meters...
Please answer question 2.
Quastion 1 answer is already provided in the photos.
1. At an outdoor lot, there is a black-colored solar heat collection copper pipe. It is 50 meters long, 10 cm in inner diameter and 10.2 cm in outer diameter. The pipe is set horizontally. Assume that solar radiation in 1.0 kW/m2 shines on the entire surface of the pipe and convert 90% of the solar energy on the pipe into heat. There is water in 25...
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 1 Calculate the heat exchange surface area required in a heat exchanger comprised of tubes with an external diameter of 25 mm in order to cool a solution of ethyl alcohol (mass flow rate kg/h, heat capacity: 3.8 kJ/kg K) from 65 C to 40 °C using a water flow (mass flow rate: 22,680 kg/h, 24,948 , heat capacity: 4.18 kJ/kg K) entering at 5 °C. The overall heat transfer coefficient related to the outside tube surface is 566...
Help me!!!!
Q2. Heat exchanger-NTU method (34 pt). An orange juice is being cooled from 85 °C at a rate of 2000 kg/h in a counter-current heat exchanger by cold water. The juice has a specific heat of 3090 J/(kg.K). The cold water enters the heat exchanger at 8°C at a rate of 2950 kg/h、The overall heat transfer coefficient U-485 w/mK and the area A 4.2 m2. Assuming steady-state conditions, calculate: (a) the heat transfer rate (J/s), (b) the exit...
.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.
please solve these questions
(a) Calculate the rate of heat transfer by radiation from a car radiator at 120 °C into a 55 °C environment, if the radiator has an emissivity of 0.75 and a 1.1-m surface area. Enter your answer in kilowatts. (b) Calculate the fraction of this radiative power to the total heat transfer by an automobile engine. Assume a mechanical horsepower of 200 hp (150 kW) and the efficienty of automobile engines as 25 %. Express your...
Page 2 of 3 Part II-Trivia (40%): check more than one if applicable Convective heat transfer at a surface is affected by the air speed. Which of the following statements is true () Increasing the air speed increases convective heat transfer () the thickness of the air film (coefficient) increases with air speed a) ) the air film (coefficient) is like an insulating blanket over the surface () the air film (coefficient) offers resistance against heat transfer The Reynolds number...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
Please answer question 2.
Quastion 1 answer is already provided in the photos.
1. At an outdoor lot, there is a black-colored solar heat collection copper pipe. It is 50 meters long, 10 cm in inner diameter and 10.2 cm in outer diameter. The pipe is set horizontally. Assume that solar radiation in 1.0 kW/m2 shines on the entire surface of the pipe and convert 90% of the solar energy on the pipe into heat. There is water in 25...
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