please show me the whole work for question 4) and 5),thank you so much
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please show me the whole work for question 4) and 5),thank you
so much
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Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
1. one wall is formed by two materials, the first one is 15cm thick and has...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2)...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
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...
4. (25 pts) Water is flowing inside a thin wall, smooth pipe of diameter 0.05 m...
4. (25 pts) Water is flowing inside a thin wall, smooth pipe of diameter 0.05 m at a mass flowrate of 0.3 kg/s. The water enters the pipe at a mean temperature Tm,i= 80 °C and exits at Tm,o= 80 °C while the pipe surface temperature is maintained at Ts= 20 °C along its entire length. a. Is the flow turbulent or laminar? b. Calculate the average convection heat transfer coefficient inside the tube. c. Calculate the length of the...
Consider an oil of density p 800 kg/m3, viscosity u 0.01 Pa.s (10 times the viscosity of water), ...
Consider an oil of density p 800 kg/m3, viscosity u 0.01 Pa.s (10 times the viscosity of water), heat capacity of Cp 2 k]/(kg K) and thermal conductivity of Koll -0.15 W/(mk). This oil flows at mass flowrate of 30 kg/minute through a copper pipe of d- 2 cm inner diameter, with wall thickness of t-1 mm. At the relevant conditions, copper has thermal conductivity of ke 400 W/(m.K). The copper pipe loses heat to the surroundings of Tsurr 20°C...
Air at T=25°C and pressure P=1 bar flows over a square plate with a velocity V=1...
Air at T=25°C and pressure P=1 bar flows over a square plate with a velocity V=1 m/s. This plate has a length L= 1 m and it is heated over its entire length; the plate temperature is constant Tp=100°C. The following data are given. For air: dynamic viscosity: mu = 1.9*10–5 kg/(m.s); density: rho = 1.05 kg/m3; conductivity k = 0.03 W/(m K); Specific heat Cp = 1.007 kJ/(kg K); Prandtl number Pr = 0.7 For laminar flow over a...
Please provide a step-by-step solution to this problem. Heat Transfer 1. The material should be f...
Please provide a step-by-step solution to this problem. Heat
Transfer 1. The material should be from the textbook (Fundamentals
of Heat and Mass Transfer) or similar
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw 0.58 kg/s. At the given position along the...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
[10] Design Problem As shown in the figure below, a double-pipe parallel-flow heat exchanger is used...
[10] Design Problem As shown in the figure below, a double-pipe parallel-flow heat exchanger is used to heat cold fluid which is water (Cp = 4180 J/(kg.K), p = 1000 kg/m) from 20°C to 80°C at a rate of 0.15 kg/s. The heating is to be accomplished by hot fluid, which is geothermal water (Cp = 4310 J/(kg.K), p = 1050 kg/m²) available at 130°C at a mass flow rate of 0.25 kg/s. The inner tube has an inner diameter...
Problem 3 (20 points) A cross-flow heat exchanger consists of a bundle of 32 tubes in a long duct. Hot water at 150°C and a mean velocity of 0.5 m/s enters the tubes having inner and outer diameters of 10.2mm and 12.5mm and has to be cooled to 136°C. The tubes are made of steel of thermal conductivity k-40 W/m.K. Air at 10°c enters the exchanger (unfinned) with a volumetric flow rate of 1.0 m3/s. The convective heat transfer coefficient...
1. one wall is formed by two materials, the first one is 15cm thick and has a thermal conductivity of 1W/mk and the second one is cork with an unknown thick. If the temperature of the inner wall is 22°C and the temperature of the outer surface is -10°C find: a) the necessary thick of the cork to maintain a heat loss of 8W. Consider an area of 1m2! b) the interface temperature. Note: use a scheme that represents the...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
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...
4. (25 pts) Water is flowing inside a thin wall, smooth pipe of diameter 0.05 m at a mass flowrate of 0.3 kg/s. The water enters the pipe at a mean temperature Tm,i= 80 °C and exits at Tm,o= 80 °C while the pipe surface temperature is maintained at Ts= 20 °C along its entire length. a. Is the flow turbulent or laminar? b. Calculate the average convection heat transfer coefficient inside the tube. c. Calculate the length of the...
Consider an oil of density p 800 kg/m3, viscosity u 0.01 Pa.s (10 times the viscosity of water), heat capacity of Cp 2 k]/(kg K) and thermal conductivity of Koll -0.15 W/(mk). This oil flows at mass flowrate of 30 kg/minute through a copper pipe of d- 2 cm inner diameter, with wall thickness of t-1 mm. At the relevant conditions, copper has thermal conductivity of ke 400 W/(m.K). The copper pipe loses heat to the surroundings of Tsurr 20°C...
Please provide a step-by-step solution to this problem. Heat
Transfer 1. The material should be from the textbook (Fundamentals
of Heat and Mass Transfer) or similar
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw 0.58 kg/s. At the given position along the...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
[10] Design Problem As shown in the figure below, a double-pipe parallel-flow heat exchanger is used to heat cold fluid which is water (Cp = 4180 J/(kg.K), p = 1000 kg/m) from 20°C to 80°C at a rate of 0.15 kg/s. The heating is to be accomplished by hot fluid, which is geothermal water (Cp = 4310 J/(kg.K), p = 1050 kg/m²) available at 130°C at a mass flow rate of 0.25 kg/s. The inner tube has an inner diameter...
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