Exterior Cross Section In connection with Otto Luhr Consulting Engineer & Herman Fridel Architect Ice Making System Patent Applied For [9] NUMBER THREE Manufacturing Costs Per Ton of Ice Using Steam Power at Medium-Sized-Town Rates for Labor 160-ton capacity per day. 1,728--400-lb. cans. 333 days continuous full output. 12,000-ton storage house. COST OF POWER: A modern, highly efficient and economical steam driven high speed compressor plant must be installed so as to get the maximum power out of coal. The boiler room will contain two 250-H. P. water-tube boilers with automatic stokers and coal bin overhead holding two weeks' supply of coal. Steam pressure 175 lbs. As the firing of the boilers is automatic and requires practically no work on the part of the engineers, no firemen are needed. Ashes will also be removed automatically. The engine room equipment will consist of two 175-ton high speed compressors, direct connected to two Simple Condensing Una-flow Engines; also two generators, two cooling tower water pumps, two air compressors, switchboard, etc. All to be equipped with the latest labor and power-saving devices. Equipped as above, 25 tons of refrigeration can be easily obtained from one ton of ordinary 12,500 B T U coal. 1.8 ton of refrigeration is required to produce one ton of ice including the required cooling of storage house. Therefore the power cost of making one ton of ice with coal at $5.00 per ton equals $5.00 divided by 25/1.8 = 37 cent. (One cent per ton of ice is added for heating of dipping tank water.) Assuming one month's shut-down for inspection and repairs, the total output of 160 tons of ice for 333 days amounts to 53,280 tons of ice. The total power cost of making 53,280 tons of ice is therefore, 53,280 x 37 cent = $ 19,713.60 [10] ENGINE ROOM AND ICE PLANT LABOR COST: 1 chief engineer per day $ 8.00 3 engineers per day $ 6.00 1 shipping clerk per day $ 6.00 3 men in Storage House per day $ 4.00 Total per day $ 44.00 365 days at $44.00 per day equals $ 16,060.00 Additional labor cost for putting 12,000 tons into winter storage and taking out at $4.00 per day $ 1,200.00 Total Labor Cost $ 17,260.00 or 17260 / 53280 = 32.4 cent per ton Engineers will do their own firing of boilers and will pull all the ice. One pull required every 43 minutes. OFFICE EXPENSE: 1 Office Man (Manager and Bookkeeper) $ 3,000.00 Stationery, Telephone, etc. (per year) $ 300.00 Total Office Expense $ 3,300.00 or 3300 / 53280 = 6.2 cent per ton of ice Cost of Ammonia at 2 cent per ton $ 1,065.60 Cost of Oil and Waste at 2 cent per ton $ 1,065.60 Cost of Water at 3 cent per ton $ 1,598.40 Cost of Salt at 1/2 cent per ton $ 266.40 Plant Maintenance and Repairs $ 2,200.00