Basic HTML Version

October 2012

4-13

Where:

••

Water Use Rate of Combination Oven (gallons per hour)

••

Daily Use Time (hours per day)

••

Days of Facility Operation (days per year)

Water Use After Replacement

To estimate the water use of a replacement combination oven, use Equation 4-3,

substituting the replacement combination oven’s hourly water use. Connectionless

combination ovens can use 15 gallons per hour or less.

Water Savings

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

bination oven, identify the following and use Equation 4-4:

••

Current water use as calculated using Equation 4-3.

••

Water use after replacement as calculated using Equation 4-3.

Where:

••

Current Water Use of Combination Oven (gallons per year)

••

Water Use of Combination Oven After Replacement (gallons per year)

Payback

To calculate the simple payback associated with the water savings from replacing

an existing combination oven, consider the equipment and installation cost of the

replacement combination oven, the water savings as calculated using Equation 4-4,

and the facility-specific cost of water and wastewater. A combination oven can cost

approximately $15,000.

27

By switching to a connectionless combination oven, facilities also save a significant

amount of energy by reducing the water use and steam generation associated with

27

Harris, Richard. EBMUD. March 5, 2008. “Turning up the Heat on Commercial Kitchen Water Savings.” Slide 26.