age house man per day $ 6.00

Total per day $ 24.00

92 days at $ 24.00 equals $ 2,208.00

1 shipping clerk per day $ 8.00

330 days x 8 equals. $ 2,640.00

Total Labor Cost. $ 14,202.00

or 14202 / 60450 = 23.49 cent per ton

compared to 46.27 cent per ton, A SAVING OF 22.78 CENT PER TON.

[7]

[Illustration: Typical Design of a 160 Ton Steam Driven Ice Plant.
Interior Details.]

[8]

[Illustration: Typical Design of a 160 Ton Steam Driven Ice Plant.]

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 p