Mechanical Engineering - Steam Boilers and Engines - Discussion

Discussion Forum : Steam Boilers and Engines - Section 1 (Q.No. 47)
47.
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be
56%
63%
74%
78%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
6 comments Page 1 of 1.

Shubham said:   2 years ago
Agree with your answer @Punam.

Vrt said:   6 years ago
Agree @Adjumani.

Adjumani tawiah said:   7 years ago
Boiler efficiency=ms(hs-hw)/mfxcv.
205(145)/23 x 2050,
= 0.63x100,
= 63%.

mf- mass of fuel.
cv- calorific value.
ms-mass of steam.
hs-enthalpy of steam > net enthalpy.
hw-enthalpy of feedwater.
(5)

Punam said:   8 years ago
Boiler efficiency = ms (h - hfi )/mf X C,
= 205 (145)/23 X 2050,
= 0.63,
= 63%.
(1)

Rohit said:   10 years ago
Output/Input in terms of heat.

Amar said:   1 decade ago
Eff: Net heat produced/ heat provided by coal.

: 205 X 145 / 2050 X 23.

: 63.00%

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