A rooftop unit is rated at 6 tons of cooling. What capacity is that in Btu/h?
Correct Answer
D) 72,000 Btu/h
Cooling capacity is 6 tons x 12,000 Btu/h per ton = 72,000 Btu/h.
Why This Is the Correct Answer
Cooling capacity is 6 tons x 12,000 Btu/h per ton = 72,000 Btu/h.
Why the Other Options Are Wrong
Option A: 60,000 Btu/h
cooling capacity conversion, choice b: 60,000 Btu/h backs into 10,000 when divided by 6; the accepted setup gives 12,000 on that same base.
Option B: 36,000 Btu/h
cooling capacity conversion, choice c: 36,000 Btu/h backs into 6,000 when divided by 6; the accepted setup gives 12,000 on that same base.
Option C: 120,000 Btu/h
cooling capacity conversion, choice d: 120,000 Btu/h backs into 20,000 when divided by 6; the accepted setup gives 12,000 on that same base.
Memory Technique
Remember cooling capacity conversion as "base, adjustment, final unit"; the last unit should read 72,000 Btu/h.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use by topic index - HVAC capacity / airflow / air changes / TAB to confirm that Cooling capacity is 6 tons x 12,000 Btu/h per ton = 72,000 Btu/h.
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