A packaged cooling unit is scheduled for 180,000 Btu/h total cooling capacity. How many tons of cooling is that?
Correct Answer
D) 15 tons
Cooling tons are 180,000/12,000 = 15 tons. Other choices use a 15,000 Btu/h conversion, divide by 10,000, or round to a larger nominal size.
Why This Is the Correct Answer
Cooling tons are 180,000/12,000 = 15 tons. Other choices use a 15,000 Btu/h conversion, divide by 10,000, or round to a larger nominal size.
Why the Other Options Are Wrong
Option A: 12 tons
cooling tons, choice a: 12 tons backs into 0.8 when divided by 180000/12000; the accepted setup gives 1 on that same base.
Option B: 18 tons
cooling tons, choice c: 18 tons backs into 1.2 when divided by 180000/12000; the accepted setup gives 1 on that same base.
Option C: 20 tons
cooling tons, choice d: 20 tons backs into 1.33 when divided by 180000/12000; the accepted setup gives 1 on that same base.
Memory Technique
Say the cooling tons rule aloud as a chain; the chain ends at 15 tons, not an intermediate stop.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use the index entry or section for "Cooling tons conversion" to confirm that Cooling tons are 180,000/12,000 = 15 tons.
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