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HXI 1 2 3 4 5 6 7 8 9 10 11 12 13
  • 1

    Manifolds and Interconnecting Pipework

    • With orifice plate.
    • With hydraulic by-pass.
  • 2

    Three Way Valve

    • With actuator.
    • With connection box.
  • 3

    Hinged Access Doors

    • Inward swinging door.
  • 4

    Cold Water Basin

    • Sloped water basin for easy cleaning.
    • Suction strainer with anti-vortex hood.
    • Adjustable Water make-up assembly with air inlet side.
    • Integral internal walkway as standard.
  • 5

    Combined Inlet Shield Technology

    • Corrosion resistant.
    • Easily removable.
    • UV resistant plastic material.
  • 6

    Heavy Duty Construction

    • Z600 hot-dip galvanised steel panels.
  • 7

    Water Distribution System

    • Overlapping spray patterns ensure proper water coverage.
    • Large orifice, non-clog nozzles.
  • 8

    Dry Finned Coil

    • Copper Tubing with high density aluminium fins.
    • Designed for max. 10 bar operating pressure according to PED.
    • Staggered tubes coil arrangement
  • 9

    * Prime Surface Coil (Not Shown)

    • Continuous serpentine, steel tubing.
    • Hot-dip galvanised after fabrication (HDGAF)
    • Sloped tubes for free drainage of fluid.
    • Designed for maximum 10 bar operating pressure according to PED.
  • 10

    * Fan Drive System (Not Shown)

    • Premium quality belts.
    • Corrosion resistant sheaves.
    • Heavy-duty bearings.
    • Adapted fan motor for operation in saturated conditions.
  • 11

    * Low kW Axial Fan (Not Shown)

    • Quiet operation.
    • Corrosion resistant aluminum.
  • 12

    * BACross Wet Deck Surface with Integral Drift Eliminators(Not Shown)

    • Plastic material.
    • Impervious to rot, decay and biological attack.
    • Designed and manufactured by BAC.
  • 13

    * Recirculating Spray Pump (Not Shown)

    • Close coupled, bronze fitted centrifugal pump.
    • Totally enclosed fan cooled (TEFC) motor.
    • Bleed line with metering valve installed from pump discharge to overflow.

Series 1500 HXI

Hybrid Wet/Dry

Key Features

  • Dual Coil Construction
  • Multiple Fan Construction
  • Full Internal Access

Key Benefits

  • Plume abatement
  • Reduced Water Consumption
  • Reduced footprint compared with other water saving products


Combined flow, Axial Fan, Induced Draft

Key Features

Dual Coil Construction

Dual coil construction allows for varying flow through each coil and the ability to use one coil or the other. This is useful for both efficiency during operation and down time during maintenance.

Multiple Fan Construction

Multiple fans provide redundancy as well as energy efficiency when working on VSD based controls.

Full Internal Access

Open internal area provided for ease of access to all components within the unit for maintenance.

Key Benefits

Plume Abatement

Through modifications to the coil arrangements and discharge design potential for plume from the unit is reduced significantly.

Reduced Water Consumption

Clever design and control strategies allow for significant reduction in water consumption compared with a conventional open system.

Up to 70% water saving

Patented intelligent flow control system. With a 3-way valve for precise setting of outlet fluid temperature and unrivalled annual water-saving. Load profile-adaptable to dry, adiabatic or combined wet-dry operation.

Principle of Operation

hxi dry

Dry operation:
The spray water pump (1) is turned off and the modulating flow control valve (3-way valve) (2) remains fully open. The warm process fluid (3) flows both through the finned discharge coil (4) and the prime surface coil (5). An axial fan (6) draws the ambient air (7) over the coil and the heat is rejected from the fluid inside the coil. In this mode neither water consumption nor plume occurs



hxi adiabatic

Adiabatic operation:
The flow control valve (3-way valve) (1) lets the warm process fluid (2) flow through the finned discharge coil (3), by-passing the wet prime surface coil (4). The prime surface coil and the fill pack (5) are wetted by the spray water (6) but there is no water evaporation for heat rejection purposes. Some water will however evaporate. This will humidify the incoming ambient air (7) that is blown over the finned discharge coil by an axial fan (8). This saturated air (9) has a better cooling capacity to cool down the process fluid in the finned coil. The spray water drops into a sloping basin or sump (10). A pump recirculates the water to the spray system. Visible plume and water consumption are greatly reduced while the design fluid outlet temperature is kept.



hxi wetdry

Wet-dry operation:

The warm process fluid (1) flows both through the finned discharge coil (2) and the prime surface coil (3). An axial fan (4) draws the air (5) over both coils and fill pack (6). At the top where the warm fluid enters the tower, the discharge air (7) is saturated and pre-cools already the fluid. Then a next heat transfer process occurs in the prime surface coil which is wetted by the spray system (8). The cooled fluid exits (9) the tower. The spray water flows further over a fill pack, improving the heat transfer process by sub-cooling the spray water. The water is collected in a sloping basin (10) and a pump (11) recirculates the cooled water again over the prime surface coil. When there is less heat load or the ambient temperature drops, the modulating valve (12) will control the flow through the prime surface coil in a way that the design fluid outlet temperature is kept and water is saved. Plume is also minimized because there is less evaporated water and the discharge air is heated with the dry finned coil.


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