REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - cooler/reefer tonnage capacity
Watch this video in my YouTube channel Eternalson17 YouTube link REFRIGERATION HVAC MECHANIC RED SEAL LICENSE EXAM REVIEWER - cooler/reefer tonnage capacity PROBLEM: An 8 x 20 ft sea container reefer walkin cooler has an hourly load of 22,500 Btu/hr and operates 24 hours a day. The defrost system runs for 15 minutes every hour. Calculate the tonnage capacity in Tons of Refrigeration and in Kilowatts. Given 22,500 Btu/hr hourly load 24 hours operation 15 minutes defrost per hour Unknown Reefer capacity in tons and KW SOLUTION: Total defrost time = 15 minutes x 24 = 360 minutes = 6 hours Total Run-Time = 24 - 6 = 18 hours Q = hourly load x 24/run time Walk in Cooler Condensing Unit capacity = ( Hourly Load x 24 hr ) / 18 hr Run-Time = ( 22,500 x 24 ) / 18 = 30,000 Btu/hr Tonnage capacity = 30,000/12,000 = 2.5 tons Capacity in Kilowatts = 2.5 x 3.5 = 8.8 KW *