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<br />4. <br /> <br />The microfilm vault cooling unit is a 3 ton cooling unit that utilizes a once through flow of <br />water. It is estimated that this unit runs for about 3 hours per day during the summer <br />months. Using a 10 gpm flowrate, water usage for this unit is estimated at 162,000 gallons <br />per year. <br /> <br />Two large swamp coolers were added onto the building in 1978, and were intended to <br />provide cooling for the facility. The larger of the two has a fan capacity of 69,500 CFM <br />while the smaller has a 54,000 CFM capacity. Due to the relative humidity in the Denver <br />area and other design deficiencies, these units have proven only marginally capable of <br />cooling this building. It is presently operated in the early spring and fall in the early <br />morning hours, approximately 4 hours per day. Water use calculations were made, based <br />on a 30% humidity and dry bulb temperature of 65 degrees F in the spring and 70 degrees <br />F in the fall. A 3.7 gpm evaporation rate for the spring and a 4.2 gpm evaporation rate for <br />fall were calculated. It is estimated that 57,000 gallons per year evaporation are associated <br />with this unit. Bleed-off would be an additional usage for this unit, estimated at 10,000 <br />gallons per year. <br /> <br />Total water usage for cooling at the Centennial Building is estimated at 229,000 gallons per <br />year. <br /> <br />Kitchen Use - The cafeteria located in this building is open from 6:00 AM to 3:30 PM <br />Monday through Friday. Approximately 150 meals are served per day. Using a .3 gallon <br />per meal for food preparation, 11,700 gallons per year are used to prepare meals. Other <br />kitchen uses, such as ice making, dishwashing, and general cleaning would amount to <br />another 5,000 gallons per year. A total water usage of 16,700 gallons per year is attributed <br />to the cafeteria. <br /> <br />Landscape Irrigation - The landscaped area adjacent to this building is minimal, estimated <br />at 4,000 square feet. It is planted with Kentucky bluegrass. Watering of this area is done <br />early in the morning, utilizing an automatic sprinkler system. Annual water use of about <br />20,000 gallons is applied to this landscape. <br /> <br />Unaccounted Use - The remaining water use, approximately 111,000 gallons was not <br />accounted for in this report. This represents approximately 4% of the total water use at this <br />facility. <br />