Basic HTML Version

4-8

October 2012

Current Water Use

To estimate the current water use from a water-cooled ice machine, identify the fol-

lowing information and use Equation 4-1:

••

The ice machine’s harvest rate, or how many pounds of ice it produces per day.

••

The ice machine’s maximum water use rate. EPAct of 2005 provides different

water use maximums for water-cooled, self-contained units with harvest rates

less than 200 pounds per day and those with harvest rates greater than or equal

to than 200 pounds per day. It also provides different water use maximums for

water-cooled, ice-making head units with harvest rates less than 500 pounds

per day; those with harvest rates greater than or equal to 500 pounds per day

and less than 1,436 pounds per day; and those with harvest rates greater than or

equal to than 1,436 pounds per day.

19

••

Days of facility operation per year.

Where:

••

Harvest Rate (pounds of ice per day)

••

Water Use Rate (gallons per 100 pounds of ice)

••

Days of Facility Operation (days per year)

Water Use After Replacement

To estimate the water use of a replacement air-cooled model, use Equation 4-1,

substituting the harvest rate (if it will change) and the new water use per hundred

pounds of ice. ENERGY STAR provides different water use maximums for qualified air-

cooled models depending on the machine type and the harvest rate.

20

Water Savings

To calculate the water savings that can be achieved from replacing an existing water-

cooled ice machine, identify the following information and use Equation 4-2:

••

Current water use as calculated using Equation 4-1.

••

Water use after replacement as calculated using Equation 4-1.

19

Energy Policy Act of 2005. Public Law 109–58. August 8, 2005.

20

EPA and DOE’s ENERGY STAR. Commercial Ice Machines Key Product Criteria,

op. cit.