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REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - walk in freezer hourly load
PROBLEM:
A 3 ton walkin freezer operates 24 hours a day and the defrosting system runs for 10 minutes every hour. Determine the hourly load in Btu/hr.
SOLUTION:
Total defrost time
= 10 minutes x 24
= 240 minutes
= 4 hours
Total Run-Time
= 24 - 4
= 20 hours
Walk in Freezer Condensing Unit capacity
= ( Hourly Load x 24 hr ) / 20 hr Run-Time
3 x 12,000 = Hourly Load x 24/20
Hourly Load = 36,000/1.2
Hourly Load = 30,000 Btu/hr
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