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2. A cross-flow heat exchanger with surface...
Consider a cross-flow heat exchanger with a surface area of 10 m². The cold fluid has...
Consider a cross-flow heat exchanger with a surface area of 10 m². The cold fluid has a heat capacity rate of 2310 W/K and inlet and outlet temperatures of 25°C and 150°C respectively. The hot fluid has a heat capacity rate of 2000 W/K and an inlet temperature of 325°C. If the cold fluid can be considered mixed and the hot fluid unmixed, find the overall heat transfer coefficient, u, in W/m2.K, and the outlet temperature, in °C, of the...
heat exchanger , NTU method 2.6. Assume that in a condenser, there will be no subcooling,...
heat exchanger , NTU method
2.6. Assume that in a condenser, there will be no subcooling, and condensate leaves the condenser at saturation temperature, T, Show that variation of the coolant temperature along the con- denser is given by 2.7. In a boiler (evaporator), the temperature of hot gases decreases from Ty to Th2, while boiling occurs at a constant temperature T. Obtain an expression, as in Problem 2.6, for the variation of hot- fluid temperature with the surface area....
Consider a very long, concentric tube heat exchanger having hot and cold water inlet temperatures of...
Consider a very long, concentric tube heat exchanger having hot and cold water inlet temperatures of 85 and 15°C. The flow rate of the hot water is twice that of the cold water. Assuming equivalent hot and cold water specific heats, determine the hot water outlet temperature for the following modes of operation: (a) counterflow and (b) parallel flow. (a) Determine the hot water outlet temperature for counterflow operation, in °C. Thy0 = | i °C (b) Determine the hot...
I. A finned-tube, cross-flow heat exchanger (F 0.96) is to use the exhaust of a gas...
I. A finned-tube, cross-flow heat exchanger (F 0.96) is to use the exhaust of a gas turbine to heat pressurized water. Laboratory measurement are performed on a prototype version of the exchanger, which has a surface area of 8 m2, to determine the overall heat transfer coefficient as a function of operating conditions. Measurements made under particular conditions, for which in-5 kgs. Thi-350 ℃, m.-0.5 kg/s, and Tu-25℃, reveal a water outlet temperature of Tso-150℃. What is the overall heat...
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...
Oil of unknown properties is heated in a shell-and-tube heat exchanger with one shell pass and...
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 K at a mass flow rate of 0.2 kg/s and leaves at 300 K. The inlet and outlet temperatures...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids are (200°C) and (60°C) gave outlet temperature of (110°C) for both sides as the surfaces were clean. After long time of use for same the inlet temperatures and flow rate, the hot fluid outlet was (130°C). Find the change in the overall heat transfer coefficient and the heat transfer values by percentage. Ans.: -37.4%, -22.2% 11.21 A liquid with a specific heat of (3200J/kg....
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and...
Hot water flows thorough a parallel flow heat exchanger at a rate of 10 kg/min and is cooled by a cold water stream of flow rate 25 kg/min. The inlet temperatures of hot and cold water streams are 70 oC and 25 oC, respectively. The outlet temperature of the hot water is expected to be 50 oC. The individual convective heat transfer coefficient on both sides of the heat transfer area is 600 W/m2 .K. Take the specific heat for...
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 concentric tube heat exchanger of length L = 2 m is used to thermally process...
A concentric tube heat exchanger of length L = 2 m is used to thermally process a pharmaceutical product flowing at a mean velocity of u_m,c = 0.1 m/s with an inlet temperature of T_c,i = 20 degree C. The inner tube of diameter D_i = 10 mm is thin walled, and the exterior of the outer tube (D_0 = 20 mm) is well insulated. Water flows in the annular region between the tubes at a mean velocity of u_m,h...
Consider a cross-flow heat exchanger with a surface area of 10 m². The cold fluid has a heat capacity rate of 2310 W/K and inlet and outlet temperatures of 25°C and 150°C respectively. The hot fluid has a heat capacity rate of 2000 W/K and an inlet temperature of 325°C. If the cold fluid can be considered mixed and the hot fluid unmixed, find the overall heat transfer coefficient, u, in W/m2.K, and the outlet temperature, in °C, of the...
heat exchanger , NTU method
2.6. Assume that in a condenser, there will be no subcooling, and condensate leaves the condenser at saturation temperature, T, Show that variation of the coolant temperature along the con- denser is given by 2.7. In a boiler (evaporator), the temperature of hot gases decreases from Ty to Th2, while boiling occurs at a constant temperature T. Obtain an expression, as in Problem 2.6, for the variation of hot- fluid temperature with the surface area....
Consider a very long, concentric tube heat exchanger having hot and cold water inlet temperatures of 85 and 15°C. The flow rate of the hot water is twice that of the cold water. Assuming equivalent hot and cold water specific heats, determine the hot water outlet temperature for the following modes of operation: (a) counterflow and (b) parallel flow. (a) Determine the hot water outlet temperature for counterflow operation, in °C. Thy0 = | i °C (b) Determine the hot...
I. A finned-tube, cross-flow heat exchanger (F 0.96) is to use the exhaust of a gas turbine to heat pressurized water. Laboratory measurement are performed on a prototype version of the exchanger, which has a surface area of 8 m2, to determine the overall heat transfer coefficient as a function of operating conditions. Measurements made under particular conditions, for which in-5 kgs. Thi-350 ℃, m.-0.5 kg/s, and Tu-25℃, reveal a water outlet temperature of Tso-150℃. What is the overall heat...
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...
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 K at a mass flow rate of 0.2 kg/s and leaves at 300 K. The inlet and outlet temperatures...
11.20 Heat exchanger of counter flow arrangement with temperatures at inlet of hot and cold fluids are (200°C) and (60°C) gave outlet temperature of (110°C) for both sides as the surfaces were clean. After long time of use for same the inlet temperatures and flow rate, the hot fluid outlet was (130°C). Find the change in the overall heat transfer coefficient and the heat transfer values by percentage. Ans.: -37.4%, -22.2% 11.21 A liquid with a specific heat of (3200J/kg....
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 concentric tube heat exchanger of length L = 2 m is used to thermally process a pharmaceutical product flowing at a mean velocity of u_m,c = 0.1 m/s with an inlet temperature of T_c,i = 20 degree C. The inner tube of diameter D_i = 10 mm is thin walled, and the exterior of the outer tube (D_0 = 20 mm) is well insulated. Water flows in the annular region between the tubes at a mean velocity of u_m,h...
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