1 The freezer time shown is for best quality only â foods kept constantly frozen at 0Â° F will keep safe indefinitely.  How long does baked ham last at room temperature? Bacteria grow rapidly at temperatures between 40 Â°F and 140 Â°F; baked ham should be discarded if left for more than 2 hours at room temperature.
Using this to calculate theoretical water-chilling capacity: 1 ton of refrigeration (12,000 BTUs per hour) will chill. 12,000 lbs. water/fish 1Â°F in 1 hour. Theoretically, then, a sample application to chill seawater and fish: 40 tons refrigeration (480,000 BTUs per hour) will chill. 120,000 lbs. water/fish 20Â°F in 5 hours.
One ton of cooling is equal to the amount of heat it requires to melt one ton of ice in one day. That equals 288,000 btu's per 24 hours, 12,000 btu's per one hour or 200 btu's per minute. One ton of cooling is equal to 12,000 BTU/hour. Well, first of all, the cooling ton is a measure used to represent the capacity of an air conditioning or refrigeration system.