(a) To determine:
The time taken by water to reach the boiling point.
Answer to Problem 29P
Solution:
4.43 hrs
Explanation of Solution
Given Info:
:
Mass of boiler is 180 kg. Mass of water is 730 kg. Initial temperature of water is 18°C. Energy supply is at a rate of 58000 kJh.
Formula used:
Where Q is heat, c is heat capacity, m is mass and T is temperature
Calculation:
Energy required to raise the temperature of water is given by
Heat energy required to change the temperature of water and boiler can be calculated as
Time to reach the boiling point can be calculated as
(b) To determine:
The time taken by water to convert to steam.
Answer to Problem 29P
Solution:
32.8 hrs
Explanation of Solution
Calculation:
Energy Q required to change water to steam is given by
L is the latent heat.
The boiling water changes to steam in 28.4 hrs. Total time taken to change water from initial temperature to steam is (28.4+4.43)or 32.8 hrs
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