An 8000 horsepower diesel engine has a...

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Question 1 of 205eccefa2bacbc34ba4d47b9a

An 8000 horsepower diesel engine has a specific fuel consumption of 0.4 lbs. of fuel per horsepower hour. If each pound of fuel contains 18,500 BTU's and 25% of the available heat leaves the engine with the exhaust, how many BTU's per hour are theoretically available for use in a waste heat boiler?

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🔍 Key Concepts

• Specific fuel consumption (SFC) – how to convert hp and lb/hp-hr into total pounds of fuel burned per hour • Using BTU content of the fuel (18,500 BTU/lb) to find the total heat input per hour • Applying the percentage of heat in the exhaust (25%) to the total heat to find what is theoretically available for a waste heat boiler

💭 Think About

• First, how can you use 8000 hp and 0.4 lb/hp-hr to find the total pounds of fuel burned in one hour? • Once you know pounds of fuel per hour, how do you use 18,500 BTU/lb to get BTU/hr? • If only 25% of the available heat leaves with the exhaust, what fraction of the total BTU/hr is available to the waste heat boiler?

✅ Before You Answer

• Be sure your fuel burn rate is in lb/hr before multiplying by 18,500 BTU/lb • Confirm that you apply the 25% factor to the total BTU/hr, not to horsepower directly • Compare your final BTU/hr result with the answer choices, paying attention to millions of BTU/hr and place value (e.g., 7.4 vs 14.8 million)

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