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Towers, Inc

Delta Cooling Towers, Inc, in 1971, designed the first polyethylene, non-corrosive cooling tower. Since then we have improved and expanded to provide complete systems for cooling process water in addition to manufacture of air stripper systems for process and groundwater remediation.


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  • Cooling Towers - Pioneer® Forced Draft
  • Cooling Towers - Paragon® Induced Draft
  • Request for Quotation - Cooling Tower
  • Request for Quotation - Air Stripper

Delta Cooling Towers

Principles of Cooling Towers

All cooling towers operate on the principle of removing heat from water by evaporating a small portion of the water that is recirculated through the unit. The heat that is removed is called the latent heat of vaporization. Each one pound of water that is evaporated removes approximately 1,000 Btu's in the form of latent heat.

What is?

A Cooling Tower?

Cooling towers are used to allow companies to remove heat from process water. By allowing companies to recirculate existing water, tremendous amounts (98%) of water usage and sewer costs can be saved. The packaged cooling tower systems Delta manufactures range from 10 to 250 tons in a single unit, systems up to 1000 tons are typical.

An Air Stripper ?

Air Strippers, a.k.a. packed towers, are typically used to remove volatile organic compounds (VOC's) from groundwater.


Cooling Tower Terms and Definitions

BTU (British Thermal Unit)

A Btu is the heat energy required to raise the temperature of one pound of water one degree Fahrenheit in the range from 32° F to 212° F

Cooling Range

The difference in temperature between the hot water entering the tower and the cold water leaving the tower is the cooling range.


The difference between the temperature of the cold water leaving the tower and the wet- bulb temperature of the air is known as the approach. Establishment of the approach fixes the operating temperature of the tower and is a most important parameter in determining both tower size and cost.


The water entrained in the air flow and discharged to the atmosphere. Drift loss does not include water lost by evaporation. Proper tower design can minimize drift loss.

Heat Load

The amount of heat to be removed from the circulating water within the tower. Heat load is equal to water circulation rate (gpm) times the cooling range times 500 and is expressed in Btu/hr. Heat load is also an important parameter in determining tower size and cost.


An evaporative cooling ton is 15,000 Btu's per hour.

Wet-Bulb Temperature

The lowest temperature that water theoretically can reach by evaporation. Wet-Bulb temperature is an extremely important parameter in tower selection and design and should be measured by a psychrometer

Pumping Head

The pressure required to pump the water from the tower basin, through the entire system and return to the top of the tower.


The amount of water required to replace normal losses caused by bleed off, drift, and evaporation.

Bleed Off

The circulating water in the tower which is discharged to waste to help keep the dissolved solids concentration of the water below a maximum allowable limit. As a result of evaporation, dissolved solids concentration will continually increase unless reduced by bleed off .

Delta Cooling Towers, Inc.

Technical Specifications for Delta Vanguard Air Strippers

Delta Air Strippers are designed to remove volatile organic chemicals and certain other substances from water.

A blower, ducted into the sump plenum provides air at a slight positive pressure and forces it to flow upward against the downward trickling water. This is a countercurrent forced draft design.

As the air passes over the water, spread over the packing surface as a thin film, the molecules of contaminant cross the air/water interface and enter the air stream. The air then exits the column either to atmosphere or to some means of vapor phase remediation process.

Delta Vanguard Air Strippers possess known, predetermined stripping performance and operational characteristics based upon field test data obtained from independent sources.

Stripper shell. The shell material is a hand lay-up FRP isophthalic polyester resin of sufficient thickness to withstand the specified operating conditions, as well as external loads imposed from earthquake Zone 4 and 120 mile/hour wind loading. Guy wiring is standard; free-standing design is available as an option. The shells are designed using the ASME/ANSI RTP-1-1989 Rev. 1991 Standards as a guide.

Treated water collection sump is integral with lower part of the shell, forming a one piece, seamless component. The sump is provided with outlet and other required connections, and incorporates a blower duct for air supply to the stripper. Access and inspection port is provided in the sump plenum.

Connections (outlet, inlet and others) are constructed of FRP and are fully gasketed with neoprene gaskets. 3" and larger connection sizes are flanged (150# flanges), smaller than 3" size connections are NPTF. All flanges up to and including 4"are gussetted.

Water distribution system is constructed of Type 1 PVC. Uniform water distribution is effected by a single full cone, non-clog PVC spray nozzle which provides uniform water loading to the entire packing surface. The typical nozzle flow turn - down ratio is 2/1. For flows up to 350 GPM the nozzle is threaded into the inlet header with an NPTM thread and can be readily removed and replaced. Nozzles for flows greater than 350 GPM are 6" 150# flange connections.

Packing. Delta-Pak

Mist eliminator is Delta AB mist eliminator, constructed of Type 1 PVC material, compounded with carbon black for UV resistance. The eliminator is designed to minimize drift loss to lower than 0.02% of the water flow.

Depth: 12 in. Type: Crimped plate, impingement type

Blower S1 and S1.5 use a cast aluminum/bronze radial bladed wheel. The unit is arrangement 4 and is directly driven by a 3450 RPM motor. S2 uses a backwardly inclined centrifugal blower wheel. The unit is arrangement 10 and is belt driven by a 3450 RPM TEFC motor. S3 through S5 uses an airfoil blade design for most efficient and quiet operation. The unit is arrangement 10 and is belt driven with an 1800 RPM TEFC motor.

Typical features:

  • Motors are TEFC design with a minimum 1.15 SF.
  • Provided with a motor/drive weather enclosure or guard
  • Belt drive units are provided with vibration isolation and blower to duct neoprene bellows.
  • Designed based upon tests made in accordance with ASHRAE Standard 51 and AMCA Standard 210-74, and are licensed to carry the AMCA SEAL.
  • Factory dynamically balanced and checked against the acceptable levels on the Rathbone Chart.
  • Standard coating is an industrial baked enamel. Other coatings are available and provided based upon AMCA Recommended Practice NO. 2601-66


Delta Cooling Towers, Inc
134 Clinton Road
Fairfield, NJ 07004,

1-800-BUY DELTA (289-3358)
Fax (201) 227-0458

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