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Water-Cooled Equipment utilizing cooling towers has always had substantial energy savings over Air-Cooled Equipment.

Now more than ever, given the typical energy savings of 40%, water-cooled equipment is the design of choice. One misconception is that air-cooled will save significant water compared to water-cooled, when in fact, the additional energy required for air-cooled equipment will consume water at the power plant energy source and will require more water.

Energy Efficiency

Recently adopted addedum 1 to ASHRAE 90.1 added minimum efficiency standards for both axial and centrifugal fan cooling towers.  The minimum efficiency values are greater than 38.2 gpm/hp for axial fan and 20.0 gpm/hp for centrifugal fan cooling towers 95 deg. F. entering water, 85 deg. F. leaving water, and 75 deg. F. wet bulb temperature.  All Delta standard cooling tower models exceed these energy efficiency performance levels.  U.S. Green Building Council LEED credits are available for buildings complying with ASHRAE 90.1 minimum efficiency standards above.  Delta was also the first cooling tower manufacturer to standardize NEMA ® Premium Efficiency Motors.


The ultimate in sustainability is a cooling tower that can outlast the building it services.  Delta’s non-corroding engineered plastic design, bakced by 20 – Year shell warranty, will not rust, corrode, or require the downtime for service that traditional metal towers require.  Traditional metal towers that last 7 to 15 years or less in many applications, confront owners with disposal issues including environmental impact, higher maintenance cost, and replacement cost.

Designed Green

Delta’s engineered plastic design allows the most aggressive water treatment options available.  This can allow users to run at higher cycles of concentration, thereby, saving make-up water.  These savings can be very large and help solve water issues.  The counterflow designs have less of an environmental impact than crossflow designs because of inherently better thermal performance.  Crossflow designs will have greater water splash out with high winds, especially when fans are off at low-load or low wet-bulb situations.  Delta towers keep the water totally enclosed and free from sunlight lessening opportuniyt for biological growth requiring extra water treatment chemicals.  Couinterflow models also can incorporate the industry’s best drift eliminators at .001% or even our optional .0005% of recirculating flow.

Carbon Footprint

While HDPE production emits 5.07 lbs of CO2 per pound during production and American carbon steel produces only .99 lbs (foreign steel as high as 2.01 lbs/co2) let’s keep in mind that a pound of steel has over eight times the densitry of HDPE.  The density of carbon steel is 490 lb/ft3, that’s right 490 pounds per cubic foot!  While the density of HDPE is only 59.3 lb/ft3.  Given these numbers, the carbon emissions of a steel cooling tower is over 57% greater than a Delta Cooling Tower.

Fun Facts

  • 490/59.3 = 8.26
  • HDPE — LBS/CO2 = 5.07*
  • STEEL — LBS/CO2 = 7.98*
  • If a Delta Tower is as much as 50% lighter, will the carbon Footprint be smaller?  Let’s see:
  • Diesel Fuel = 22.284 lbs CO2 per gal.*
  • Average diesel truck fuel mileage = 6 mpg*
  • EPA estimates trucks lose 0.5% fuel efficiency per 1000 lbs of additional weight*
  • If a truck hauls a Delta Cooling Tower 1000 miles it will burn 162.5 gallons of diesal fuel while the same truck haulin ga steel tower will burn 166.6 gal.  Doesn’t sound like a lot?  Let’s say Delta and a competitor ships 500 cooling towers a year, the trucks that haul steel towers emit 45,887.2 pounds more CO2 than the trucks hauling Delta Cooling Towers.  That’s almost 23 TONS OF CARBON!!!

Electricity Consumption

Let’s look at energy consumptions, in this case electricity usage.  Delta Cooling Tower’s innovative design runs less horsepower.  Remember from earlier that Delta uses only NEMA Premium Efficiency Motors.  Let’s use Delta’s 3 cell TM model as an example;

              Delta Cooling Towers:

  • 6-5 hp motors
  •  Horsepower: 30
  •  % full load: 90%
  •  Annual operating hours: 8760
  •  Electric cost: .05/kwh
  •  Annual operating cost: $10,570.00**


  • 4-15 hp standard motors
  • Horsepower: 60
  • % full load: 90%
  • Annual operating hours: 8760
  • Electric cost: .05/kwh
  • Annual operating cost: $22,600.00*