Question
Download Solution PDFA steam power station uses 2 kg of coal per kWh of electrical energy generated. What is the calorific value of coal if the overall efficiency of the plant is 20%?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The efficiency of a coal is given by:
Let CV be the calorific value of coal in kcal/kg. The total energy input from n kg of coal:
Total Input Energy = n × CV
Calculation
Given, η = 20% = 0.2
Coal consumption = 2 kg per kWh
Output energy = 1 kWh = 860 kcal (since 1 kWh = 860 kcal of useful energy)
CV = 2150 kcal/kg
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