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I. A finned-tube, cross-flow heat exchanger (F 0.96) is to use the exhaust of a gas...
Please use the NTU method. I am having trouble. 2. A cross-flow heat exchanger with surface...
Please use the NTU method. I am having trouble.
2. A cross-flow heat exchanger with surface area A, , is desd with inlet conditions The = 350°C and T,,i = 20°C, and outlet condition Te,o-14°C. If hot air with miass flow mh = 2.2 -g is used to heat pressurized water flowing at mc = 0.6 kg, what is the overall heat transfer coefficient of the exchanger? The water remains in the liquid state and evaluate thermal properties of the...
please do 11.33 11.32 A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat...
please do 11.33
11.32 A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30 to 80°C at a rate of 3 kg/s. The exhaust gases, hav- ing thermophysical properties similar to air, enter and exit the exchanger at 225 and 100°C, respectively. If the overall heat transfer coefficient is 200 W/m2.K, estimate the required surface area. 11.33 Consider the fluid conditions and overall heat transfer coefficient of Problem 11.32 for a concentric tube heat...
A concentric tube heat exchanger for cooling lubricating oil consists of a thin-walled inner tube of...
A concentric tube heat exchanger for cooling lubricating oil
consists of a thin-walled inner tube of 25 mm diameter carrying
water and an outer tube of 45 mm diameter carrying the oil. The
exchanger operates in countercurrent flow with an overall heat
transfer coefficient of 55 W/m2 K and the tabulated average
properties given below. Mass flow rates of oil and water are both
0.1 kg/s, oil enters the exchanger at 100°C, and water enters the
exchanger at 30°C. (a)...
Design a heat exchanger for a gas turbine exhaust A paper mill has just purchased a...
Design a heat exchanger for a gas turbine exhaust A paper mill has just purchased a 5.7 MW gas turbine for electrical power generation. To increase the overall plant efficiency and reduce the payback time it has been decided to use the exhaust gases to heat water in a heat exchanger. The company requires 12.7 tonnes/hr of steam at a pressure of 18.9 Bar and at a temperature of 315oC. The temperature and pressure at inlet to the heat exchanger...
A cross-flow heat exchanger used in a cardiopulmonary bypass procedure cools blood flowing at 4 L/min...
A cross-flow heat exchanger used in a cardiopulmonary bypass procedure cools blood flowing at 4 L/min from a body temperature of 37°C to 25°C in order to induce body hypothermia, which reduces metabolic and oxygen requirements. The coolant is ice water at 0°C, and its flow rate is adjusted to provide an outlet temperature of 13°C. The heat exchanger operates with the blood flow unmixed and the water flow mixed, and the overall heat transfer coefficient is 750 W/m2.K. The...
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...
6. A shell-and-tube heat exchanger with 2-shell passes and 12-tube passes is used to heat water...
6. A shell-and-tube heat exchanger with 2-shell passes and 12-tube passes is used to heat water (c 4,180 J/kg K) flowing at a rate of 4.5 kg/s in the tubes from 20°C to 70°C. Heat is supplied by hot oil (cp 2300 J/kg K) that enters the shell side at 170°C at a rate of 10 kg/s. If overall heat transfer coefficient on the tube-side is 350 W/m-K, determine the heat transfer surface area on the tube side.
QUESTION 2 2. A shell and tube heat exchanger with two shell passes and four tube...
QUESTION 2 2. A shell and tube heat exchanger with two shell passes and four tube passes cools a chemical with a specific heat of 2385 J/kg K at a rate of 1.25 kg/s from 140°C to 80°C, using water at 35°C. The outlet temperature of the water is 85°C. Determine the area of heat exchanger if U= 800 W/m2-K. If the unit is operated with flow rates doubled, determine the heat transfer. Also determine the heat transfer if the...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the sam...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
4. A Cross-Flow Air-to-Water Heat Exchanger with an effectiveness of 0.58 is used to heat water, ...
4. A Cross-Flow Air-to-Water Heat Exchanger with an effectiveness of 0.58 is used to heat water, entering at 20°C at a rate of 4 kg/s, using hot air, entering at 127oC at a rate of 10 kg/s. The Overall Heat Transfer Coefficient for the Heat exchanger is 275 W/m'K. Assuming both fluids are unmixed, determine; (i) The Heat Capacity rates for both the air and the water (ii) The heat transfer surface area. ii) The exit temperature of the water...
Please use the NTU method. I am having trouble.
2. A cross-flow heat exchanger with surface area A, , is desd with inlet conditions The = 350°C and T,,i = 20°C, and outlet condition Te,o-14°C. If hot air with miass flow mh = 2.2 -g is used to heat pressurized water flowing at mc = 0.6 kg, what is the overall heat transfer coefficient of the exchanger? The water remains in the liquid state and evaluate thermal properties of the...
please do 11.33
11.32 A single-pass, cross-flow heat exchanger uses hot exhaust gases (mixed) to heat water (unmixed) from 30 to 80°C at a rate of 3 kg/s. The exhaust gases, hav- ing thermophysical properties similar to air, enter and exit the exchanger at 225 and 100°C, respectively. If the overall heat transfer coefficient is 200 W/m2.K, estimate the required surface area. 11.33 Consider the fluid conditions and overall heat transfer coefficient of Problem 11.32 for a concentric tube heat...
A concentric tube heat exchanger for cooling lubricating oil
consists of a thin-walled inner tube of 25 mm diameter carrying
water and an outer tube of 45 mm diameter carrying the oil. The
exchanger operates in countercurrent flow with an overall heat
transfer coefficient of 55 W/m2 K and the tabulated average
properties given below. Mass flow rates of oil and water are both
0.1 kg/s, oil enters the exchanger at 100°C, and water enters the
exchanger at 30°C. (a)...
A cross-flow heat exchanger used in a cardiopulmonary bypass procedure cools blood flowing at 4 L/min from a body temperature of 37°C to 25°C in order to induce body hypothermia, which reduces metabolic and oxygen requirements. The coolant is ice water at 0°C, and its flow rate is adjusted to provide an outlet temperature of 13°C. The heat exchanger operates with the blood flow unmixed and the water flow mixed, and the overall heat transfer coefficient is 750 W/m2.K. The...
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...
6. A shell-and-tube heat exchanger with 2-shell passes and 12-tube passes is used to heat water (c 4,180 J/kg K) flowing at a rate of 4.5 kg/s in the tubes from 20°C to 70°C. Heat is supplied by hot oil (cp 2300 J/kg K) that enters the shell side at 170°C at a rate of 10 kg/s. If overall heat transfer coefficient on the tube-side is 350 W/m-K, determine the heat transfer surface area on the tube side.
QUESTION 2 2. A shell and tube heat exchanger with two shell passes and four tube passes cools a chemical with a specific heat of 2385 J/kg K at a rate of 1.25 kg/s from 140°C to 80°C, using water at 35°C. The outlet temperature of the water is 85°C. Determine the area of heat exchanger if U= 800 W/m2-K. If the unit is operated with flow rates doubled, determine the heat transfer. Also determine the heat transfer if the...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
4. A Cross-Flow Air-to-Water Heat Exchanger with an effectiveness of 0.58 is used to heat water, entering at 20°C at a rate of 4 kg/s, using hot air, entering at 127oC at a rate of 10 kg/s. The Overall Heat Transfer Coefficient for the Heat exchanger is 275 W/m'K. Assuming both fluids are unmixed, determine; (i) The Heat Capacity rates for both the air and the water (ii) The heat transfer surface area. ii) The exit temperature of the water...
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