A double-pipe-counter-flow heat exchanger has an overall heat transfer coefficient of 284". K when it's new. The hot fluid enters this heat exchanger with a temperature of 93°C and comes out with a temperature of 71°C, while the cold fluid enters with a temperature of 27°C and comes out with a temperature of 38°C. If during use, there is a fouling factor of Re = 4x10-4m². Count : a. Log Mean Temperatur Difference (ATim) b. The rate of heat transfer when the heat exchanger is new c. The rate of heat transfer when the Heat Exchanger has a buildup of impurities d. Changes in the rate of heat transfer due to use Teản Thin Trout Teout C,out

A double-pipe-counter-flow heat exchanger has an overall heat transfer coefficient of 284". K when it's new. The hot fluid enters this heat exchanger with a temperature of 93°C and comes out with a temperature of 71°C, while the cold fluid enters with a temperature of 27°C and comes out with a temperature of 38°C. If during use, there is a fouling factor of Re = 4x10-4m². Count : a. Log Mean Temperatur Difference (ATim) b. The rate of heat transfer when the heat exchanger is new c. The rate of heat transfer when the Heat Exchanger has a buildup of impurities d. Changes in the rate of heat transfer due to use Teản Thin Trout Teout C,out

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.40P

See similar textbooks

Similar questions

Water flowing in a long, aluminum lube is to be heated by air flowing perpendicular to the exterior of the tube. The ID of the tube is 1.85 cm, and its OD is 2.3 cm. The mass flow rate of the water through the tube is 0.65kg/s, and the temperature of the water in the lube averages 30C. The free-stream velocity and ambient temperature of the air are 10m/sand120C, respectively. Estimate the overall heat transfer coefficient for the heat exchanger using appropriate correlations from previous chapters. State all your assumptions.
10.1 In a heat exchanger, as shown in the accompanying figure, air flows over brass tubes of 1.8-cm 1D and 2.1-cm OD containing steam. The convection heat transfer coefficients on the air and steam sides of the tubes are , respectively. Calculate the overall heal transfer coefficient for the heal exchanger (a) based on the inner tube area and (b) based on the outer tube area.
What is the main difference between a copper and a cupronickel coaxial heat exchanger, and where is each used?
In a double pipe heat exchanger if the wall resistance can be neglected and the convective heat transfer coefficient on inner diameter basis of inner pipe is 1W/m2K and convective heat transfer coefficient on basis of outside diameter is 600W/m2K, then overall heat transfer coefficient is
1. A double-pipe parallel-flow heat exchanger is used to heat cold tap water with hot water. Hot water (Cp = 4.25 kJ/kg. K) Enters the tube at 85°C at a rate of 1.4 kg/s and leaves at 50 °C The heat exchanger is not well insulated, and it is estimated that 3 percent of the heat given up by the hot fluid is lost from the heat exchanger. If the overall heat transfer coefficient and the surface area of the heat exchanger are 1150 W/m2K and 4 m2, respectively, determine the rate of heat transfer to the cold water and the log mean temperature difference for this heat exchanger.
In an industrial facility a counter-flow double-pipe heat exchanger uses superheated steam at a temperature of 250°C to heat feed water at 30°C. The superheated steam experiences a temperature drop of 70°C as it exits the heat exchanger. The water to be heated flows through the heat exchanger tube of negligible thickness at a constant rate of 3.47 kg/s. The convective heat transfer coefficient on the superheated steam and water side is 850 W/m2·K and 1250 W/m2·K, respectively. To account for the fouling due to chemical impurities that might be present in the feed water, use an appropriate fouling factor for the water side. Determine (a) the heat exchanger area required to maintain the exit temperature of the water to a minimum of 70°C, and (b) what would be the required heat exchanger area in case of parallel flow arrangement?
A body-and-tube heat exchanger with 2 shells and 8 tubes is used to heat ethyl alcohol (cp=2670J/kg.°C) from 25 °C to 70 °C with a flow rate of 2.1 kg/s in pipes with a diameter of 3 cm. Heating It is made with water that enters the body at 95 °C and leaves at 60 °C (cp=4190J/kg.°C). If the total heat transfer coefficient is 800 W/m2.°C, calculate the total length of the heat exchanger using the Ɛ-NTU method.
Water enters at 110 ℃ at a rate of 2 kg/s in a double-pipe parallel flow heat exchanger to heat a chemical whose inlet temperature is 20 ℃ and at a rate of 3 kg/s. The overall heat transfer coefficient of the heat exchanger is 1200 W/m2. ℃. The heat transfer surface area of the heat exchanger is 7.6 m2. What is the actual heat transfer rate of the heat exchanger? The specific heats of the water and chemical are given to be 4.18 and 1.8 kJ/kg.℃, respectively. Select one: a. 277 kW b. 255 kW c. 207 kW d. 305 kW
In a facility, a counter-flow double-pipe heat exchanger is used to cool the fluid at a flow of 10.0 kg / s (Cp = 3.15 kJ / kgK) with an inlet temperature of 90 0C, and the surface area of the heat exchanger is As = 9 m2. The refrigerant (Cp = 4.2 kJ / kgK) enters the heat exchanger at a temperature of 10 ° C and a flow rate of 8.0 kg / h. Total heat transfer coefficient according to system data; ? = equation is given image. a) Calculate the heat transfer and heat exchanger exit temperatures.b) Existing heat exchanger is wanted to be changed. A seller offers an attractive discount to the plant authorities for two heat exchangers of the same property with a surface area of As = 5 m2. Since the pipe diameters in existing and new heat exchangers are the same, it is expected that the total heat transfer coefficient equation given above will also be valid for new heat exchangers. The vendor suggests that both heat exchangers can be operated in parallel in a counter-flow fashion, so that…