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hello welcome to another refrigeration and hbac mechanic red sale license exam review so in this problem we have a three ton walk-in freezer that operates 24 24 hours a day and the defrosting system runs for 10 minutes every hour the question is to determine the hourly load in btu per hour so in order in order to solve this we need to solve for the total defrost time so we have 10 minutes every hour and mean we need the total defrost time for the whole day which is uh 24 hours in a 24 hour period we have 10 minutes times 24 we have 240 minutes and we divide this by 60 is equal to 4 hours and so now that we know the the total the first time of four hours the total run time is the amount of time that the walk-in freezer actually run so this is 24-4 equal to 20 hours we subtracted the 4 hours of down time the defrost time because that is the time in which the walk-in freezer was not operating so weve got 20 hours as the total run time now in order to solve for the walk-in freezer [Music
