. A double-pipe counter-flow heat exchanger is to cool ethylene glycol (Cp 2560 J/kg - 'C) flowing at a rate of 3.5 kg/s from 80°C to 40c by water (Cp 4180 J/kg "C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is 250 W/m2 . "C. Determine (a) the rate of heat transfer, (b) the mass flow rate of water, and (c) the heat transfer surface area on the inner side of the tube.

. A double-pipe counter-flow heat exchanger is to cool ethylene glycol (Cp 2560 J/kg - 'C) flowing at a rate of 3.5 kg/s from 80°C to 40c by water (Cp 4180 J/kg "C) that enters at 20°C and leaves at 55°C. The overall heat transfer coefficient based on the inner surface area of the tube is 250 W/m2 . "C. Determine (a) the rate of heat transfer, (b) the mass flow rate of water, and (c) the heat transfer surface area on the inner side of the tube.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Water (Cp = 4200 J/kg- °C) is used cool an unknown fluid (with a given Cp = 3810 J/kg.ºC) using a two-pass parallel flow double-pipe heat exchanger. The unknown fluid enters the heat exchanger at 66 °C with a flowrate of 1.46 kg/s. Water can be supplied at 10 °C and 1.32 kg/s. If the heat exchanger cool the unknown fluid to 39 °C, then the NTU of this heat exchanger is equal to O 0.79 1.59 O 3.18 O 4.77
2. In a counterflow double-pipe heat exchanger, the hot fluid enters at 149°C and exits at 76°C. The cold fluid enters at 33°C and exits at 87°C. What is the heat exchanger effectiveness? Express your answer as a decimal value.
A counter-flow heat exchanger is used to cool water from 60°C to 20°C. The water flows at 0.2 m/s through the inner tube and the cooling fluid flows in the enclosure. The inner tube is 6-cm in diameter and 15-m in length. It is thin and made of copper. The flow rate of the cooling fluid is 1.2 kg/s and convection coefficient is 360 W/m².°C. The specific heat of the cooling fluid is 1600 J/kg. °C. The surface temperature of the inner tube can be approximated as almost isothermal. (a) What is the mass flow rate of water? 0.56 kg/s (b) What is the effectiveness of this heat exchanger? 0.285
In a double-pipe, counter-flow heat exchanger, water entering at 1 kg/s is heated from 23°C to 69°C as it flows thru the inner pipe. Hot oil enters the heat exchanger at 2 kg/s and 110°C. The convection heat transfer coefficients in the cold- and hot-sides are 100 and 50 kW/m2.0C, respectively. Calculate the required heat transfer area in m?. Take cp = 4.18 kJ/kg.°C for water, and cCp = 1.67 kJ/kg.°C for oil. Round your answer to 2 decimal places. Add your answer
In a double-pipe, counter-flow heat exchanger, water entering at 1.5 kg/s is heated from 25°C to 70°C as it flows thru the inner pipe. Hot oil enters the heat exchanger at 2.5 kg/s and 115°C. The convection heat transfer coefficients in the cold- and hot-sides are 100 and 50 kW/m2.°C, respectively. Calculate the required heat transfer area in m2. Take Cp= 4.18 kJ/kg.°C for water, and cp = 1.67 %3D %3D kJ/kg.°C for oil.
Solve it correctly
Help needed with heat exchanger question
A shell-and-tube heat exchanger with 2 shell passes and 12 tube passes is used to heat water (cp = 4180 J/kg•K) in the tubes from 20 °C to 70 °C at a rate of 4, 5 kg/sec. Heat is supplied by hot oil (cp = 2300 J/kg•K) entering the shell side at 170 °C at a rate of 10 kg/s. For a total heat transfer coefficient on the tube side of 350 W/m²•K, determine the area of the heat transfer surface on the tube side. Mainly, I also need the solution from concepts of how the heat flow behaves in the system, it can be with a diagram.
How would you formulate this problem to obtain a more meaningful result which desired to cool a gas has [Cp = 0.35 Btu/(Ib)(°F)] from 190 to 95°F, using cooling water at 83°F. Water costs $0.30/1100 f, and the annual fixed charges for the exchanger are $0.60/ft of inside surface, with a diameter of 0.0775 ft. The heat transfer coefficient is U = 8 Btu/(h)(f)(F) for a gas rate of 2900 Ib/hr. Plot the annual cost of cooling water and fixed charges for the exchanger as a function of the outlet water temperature. What is the minimum total cost?
A long, thin-walled double-pipe heat exchanger with tube and shell diameters of 0.01 m and 0.025 m, respectively, is used to condense refrigerant-134a with water at 20°C. The refrigerant flows through the tube, with a convection heat transfer coefficient of hi= 4100 W/m² °C. Water flows through the shell at a rate of 0.3 kg/s. The thermal resistance of the inner tube is negligible since the tube material is highly conductive and its thickness is negligible. Both the water and refrigerant-134a flows are fully developed. Properties of the water and refrigerant-134a are constant. Water properties: p = 998 kg/m³, v=u/p-1.004x 10-6 m²/s, k = 0.598 W/m. °C, Pr = 7.01 Cold water D Do