(a) Explanation Given: Hot fluid is ethylene glycol and cold fluid is water Hot and cold fluid inlet temperature T h , i = 333 K and T c , i = 283 K Mass flow rate of the hot and cold fluid are m ⋅ h = 2 k g / s and m ⋅ c = 5 k g / s Overall heat transfer coefficient = U = 800 W / m 2 ⋅ K Total heat transfer area of the shell and tube heat exchanger is A=15 m 2 Explaination: No. of transfer unit = N T U = U A C min Heat loss by heat fluid is equal to heat gained by the cold fluid by performing an energy balance. Accordingly we have q = C h ( T h , i − T h , o ) = C c ( T c , o − T c , i ) ........ ( 2 ) Where heat capacity of the cold fluid is C c = m ⋅ c c p , c And, heat capacity of hot fluid C h = m ⋅ h c p , h For cold fluid = (at T ¯ ≈ 288 K ): Specific heat of cold fluid is C p , c = 4186 k J / k g ⋅ K By putting the values of parameter into C c , C c = 5 k g / s × 4.186 k J / k g ⋅ K Or C c = 20930 W/K For hot fluid = (at T ¯ ≈ 313 K ): Specific heat of cold fluid is C p , h = 2.474 k J / k g ⋅ K By putting the values of parameter into C h , 2 k g / s × 2.474 k J / k g ⋅ K Or C h = 4948 W / K By putting C c , C h and the operating temperatures into (2) 4948 W / K ( 333 − T h , o , ) K = 20930 W / K ( T c , o − 283 ) K T c , o − 361.723 = 0.2364 T h , o T c , o + 0.2364 T h , o = 361.723....... ( 3 ) By observing C min = C h a n d C max = C c Heat capacity ratio = C r = C min C max Accordingly, C r = 4948 W / K 20930 W / K = 0.2364 By putting the values of parameter into 1 N T U = 800 W / m 2 ⋅ K × 15 m 2 4948 W / K = 12000 4948 W / K o r N T U = 2.425 For a shell and tube heat exchanger with one shell pass and (2,4…. Tube passes) effectiveness from the effectiveness relatons is ε = 2 { 1 + C r + ( 1 + C r 2 } 0 (b) To determine The fluid outlet temperatures

7th Edition

ISBN: 9780470917855

Author: Bergman, Theodore L./

Publisher: John Wiley & Sons Inc

See similar textbooks

Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Videos

Question

Chapter 11, Problem 11.84P

(a)

To determine

Rate of heat transfer

(b)

To determine

The fluid outlet temperatures

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 11, Problem 11.82P

Chapter 11, Problem 11.90P

Students have asked these similar questions

Part 1 The storage tank contains lubricating oil of specific gravity 0.86 In one inclined side of the tank, there is a 0.48 m diameter circular inspection door, mounted on a horizontal shaft along the centre line of the gate. The oil level in the tank rests 8.8 m above the mounted shaft. (Please refer table 01 for relevant SG, D and h values). Describe the hydrostatic force and centre of pressure with the aid of a free body diagram of the inspection door. Calculate the magnitude of the hydrostatic force and locate the centre of pressure. 45° Estimate the moment that would have to be applied to the shaft to open the gate. Stop B If the oil level raised by 2 m from the current level, calculate the new moment required to open the gate. Figure 01

From thermodynamics please fill in the table show all work step by step

The 150-lb skater passes point A with a speed of 6 ft/s. (Figure 1) Determine his speed when he reaches point B. Neglect friction. Determine the normal force exerted on him by the track at this point. 25 ft B = 4x A 20 ft x

Chapter 11 Solutions

Fundamentals of Heat and Mass Transfer

Ch. 11 - In a fire-tube boiler, hot products of combustion...Ch. 11 - A shell-and-tube heat exchanger is to heat an...Ch. 11 - A steel tube (k=50W/mK) of inner and outer...Ch. 11 - A heat recovery device involves transferring...Ch. 11 - A novel design for a condenser consists of a tube...Ch. 11 - The condenser of a steam power plant...Ch. 11 - Thin-walled aluminum tubes of diameter D = 10mmare...Ch. 11 - A tinned-tube, cross-how heat exchanger is to use...Ch. 11 - Water at a rate of 45,500kg/h is heated from 80...Ch. 11 - A novel heat exchanger concept consists of a...

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Rate of heat transfer

Solution Summary: The author explains that heat loss by heat fluid is equal to heat gained by the cold fluid by performing an energy balance.

Concept explainers

Videos

Rate of heat transfer

The fluid outlet temperatures

Want to see the full answer?

Chapter 11 Solutions