Sustainable Energy
Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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Chapter 3, Problem 19P
To determine

Calculate the annual mass of the coal used.

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Calculate the Gross and Net calorific values of a coal having the following compositions, C = 63 %, H2 = 19 %, 02 = 03 %, S =13 % and ash=2.
At 260°C and 7.62 m/s, the products of combustion of 635 kg coal per hour travel through a breeching. Excess air, 50%.Assume square section breeching and find its dimensions. Sea level, and density of the flue gas-coal fired = 0.68 kg/m3 Ultimate Analysis of coal is as follows: Sulfur 0.55% ; Nitrogen 1.17% Hydrogen 4.5% ; Oxygen 6.03% Carbon 84.02% ; Ash 3.73%
The enthalpy of combustion of benzoic acid (C6 H5 COOH) is commonly used as the standard for  calibrating constant-volume bomb calorimeters;  its value has been accurately determined to be  −3226.7 kJ/mol. When 1.9862 g of benzoic acid are  burned in a calorimeter, the temperature rises from  21.84°C to 25.67°C. What is the heat capacity of the  bomb? (Assume that the quantity of water surrounding  the bomb is exactly 2000 g.)
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