A shell-and-tube heat exchanger with 2- shell passes and 12-tube passes is used to heat water (Cp = 4180 J/kg °C) with ethylene glycol (Cp = 2680 J/kg °C). Water enters the tubes at 22°C at a rate of 0.5 kg/s and leaves at 70°C. Ethylene glycol enters the shell at 110°C and leaves at 60°C. If the overall heat transfer coefficient based on the tube side is 280 W/m2 °C, determine the rate of heat transfer. Select one: a. 97.8 kW b. 94.1 kW c. 160.5 kW X d. 132.4 kW The correct answer is: 94.1 kW

A shell-and-tube heat exchanger with 2- shell passes and 12-tube passes is used to heat water (Cp = 4180 J/kg °C) with ethylene glycol (Cp = 2680 J/kg °C). Water enters the tubes at 22°C at a rate of 0.5 kg/s and leaves at 70°C. Ethylene glycol enters the shell at 110°C and leaves at 60°C. If the overall heat transfer coefficient based on the tube side is 280 W/m2 °C, determine the rate of heat transfer. Select one: a. 97.8 kW b. 94.1 kW c. 160.5 kW X d. 132.4 kW The correct answer is: 94.1 kW

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 10.14P

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?
To cool the lubricating oil, a concentric counter-flow heat exchanger is utilized, with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of 0.18 kg/s. The intake and output oil temperatures are 95ºC and 65ºC, respectively, as the oil runs through the outer annulus (0.04 m) at a flow rate of 0.12 kg/s. The water enters the heat exchanger at a temperature of 30ºC. Stating all the necessary assumptions, (a) determine required length of the pipe. (b) Considering the effect of fouling during operation through time and the heat transfer resistance would be affected, discuss the design and operation considerations to minimize the fouling problem on the opertion of the heat exchanger during design and operation stages. Consider average value of Engine oil property: Cp=2131 J/kgoC; μ=0.0325 Ns/m2; K=0.138 W/moC Consider average value of water properties: Cp=4174 J/kgoC; μ=725x 10-6 Ns/m2; K=0.138 W/moC; Pr=4.85 Please clear Answer words
To cool the lubricating oil, a concentric counter-flow heat exchanger is utilized, with the water flowing via an internal pipe with an internal diameter of 0.02 m and a flow rate of 0.18 kg/s. The intake and output oil temperatures are 95ºC and 65ºC, respectively, as the oil runs through the outer annulus (0.04 m) at a flow rate of 0.12 kg/s. The water enters the heat exchanger at a temperature of 30ºC. Stating all the necessary assumptions, (a) determine required length of the pipe. (b) Considering the effect of fouling during operation through time and the heat transfer resistance would be affected, discuss the design and operation considerations to minimize the fouling problem on the opertion of the heat exchanger during design and operation stages. Consider average value of Engine oil property: Cp=2131 J/kgoC; μ=0.0325 Ns/m2; K=0.138 W/moC Consider average value of water properties: Cp=4174 J/kgoC; μ=725x 10-6 Ns/m2; K=0.138 W/moC; Pr=4.85
Glycerin (cp=2400J/kgK) at 20oC and 0.5kg/s is heated by ethylene glycol (cp=2500J/kgK at 50oC at the same mass flow rate. The overall heat transfer coefficient for this thin-walled double-pipe parallel flow heat exchanger is 380W/m2K and the heat transfer surface area is 6.5m2. Determine heat transfer rate for the heat exchanger. Determine the outlet temperatures of both fluids.
A shell and tube heat exchanger is designed as a counter to cool a mass flow rate of 60 kg/h of engine oil (cp = 1060 J/kg oC) from 300oC to 150oC. The cooling water, cp = 4182 J/kgoC, enters the tube side (Length is 1.75 m and Outer diameter is 2.54 cm) at a temperature of 20oC. If the overall heat transfer coefficient, U, is 10.83 W/m2o C and the Capacity Ratio of the Heat Exchanger is 2.4, calculate the following: a)The heat transfer rate,b)The mass flow rate of the cooling water in the units of (kg/h),C)The surface area of the heat exchanger,
A shell and tube heat exchanger is designed as a counter flow type. Water (cp = 4182 J/kg.oC)enters the shell side at 30 oC with a mass flow rate of 12.5 kg/s. A mass flow rate of 19.5 kg/s of engine oil (cp = 1060 J/kg.oC), enters the tube side at 300 oC. Each tube is having an inner diameter of 36 mm and a wall thickness of 2 mm, and a length of 3 m. If the heat exchanger effectiveness is60 %, calculate the following: a) The tube side surface area if the overall heat transfer coefficient is 1586 W/m2. oC,b) The number of tubes used in the heat exchanger,
Determine the rate of heat transfer and the heat transfer surface area on the tube side if A shell-and-tube heat exchanger with 2-shell passes and 12-tube passes is used to heat water (Cp = 4180 J/kg · °C) with ethylene glycol (Cp = 2680 J/kg · °C). Water enters the tubes at 22°C at a rate of 0.8 kg/s and leaves at 70°C. Ethylene glycol enters the shell at 110°C and leaves at 60°C. If the overall heat transfer coefficient based on the tube side is 280 W/m2 · °C,
A double-pipe parallel-flow heat exchanger is used to heat water (cp = 4180 J/kg·K) from 25°C to 60°C at a rate of 0.2 kg/s. The heating is accomplished by geothermal water (cp = 4310 J/kg·K) available at 134°C at a mass flow rate of 0.3 kg/s. The inner tube is thin-walled and has a diameter of 0.8 cm. If the overall heat transfer coefficient of the heat exchanger is 550 W/m2·K, determine the length of the tube required to achieve the desired heating. (Round the answer to a single decimal place.) The length of the tube required to achieve the desired heating is ________ m.
A shell and tube heat exchanger is designed as a counter flow type. Water (cp = 4182 J/kg.oC) enters the shell side at 30 oC with a mass flow rate of 12.5 kg/s. A mass flow rate of 19.5 kg/s of engine oil (cp = 1060 J/kg.o C), enters the tube side at 300 oC. Each tube is having an inner diameter of 36 mm and a wall thickness of 2 mm, and a length of 3 m. If the heat exchanger effectiveness is 60 %, calculate the following:1. The heat transfer rate,2. The exit temperature for each fluid,
Consider a water-to-water double-pipe heat exchanger whose flow arrangement is not known. The temperature measurements indicate that the cold water enters at 20°C and leaves at 50°C, while the hot water enters at 80°C and leaves at 45°C. Do you think this is a parallel-flow or counter-flow heat exchanger? Explain.