Answered: Calculate the energy requirement to…

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

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Question

Calculate the energy requirement to raise the temperature of 1 kg of water from 60 ° C of water to 90 ° C using the following approach;

a. Average specific heat usage (Tab A Singh's Book. 4.1) = kJ

b. The enthalpy change in the water - vapor saturation table (Tab A Singh's Book. 4.2) = kJ

Expert Solution

Step 1:-Given data

$m a s s o f w a t e r = 1 k g; I n i t i a l t e m p e r a t u r e = 60^{°} C; F i n a l t e m p e r a t u r e = 90^{°} C;$

$∆ T = (F i n a l t e m p e r a t u r e) - (i n i t i a l t e m p e r a t u r e); ∆ T = T_{F} - T_{I}; ∆ T = (90^{°}) - (60^{°}); ∆ T = 30 ° C;$

$c_{w} = 4.186 \frac{k J}{k g -^{°} C};$

Step 2:-Average specific heat usage

$(A v e r a g e s p e c i f i c h e a t) = \frac{(A v e r a g e h e a t)}{(m)}; (q) = \frac{(Q)}{(m)}; (q) = \frac{(m \times c_{w} \times (∆ T))}{(m)}; (q) = (c_{w} \times (∆ T)); (q) = ((4.186) \times (30)); (q) = (125.58) k J / k g;$

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