Danfoss VLT 6000 HVAC Servisní příručka stáhnout pdf (Strana 20)

VLT

6000 HVAC

MG.60.B1.02 - VLT is a registered Danfoss trademark

Water Inlet

Water Outlet

CHILLER

Temperature

Sensor

BASIN

Conderser

Water pump

Supply

■■

■ Cooling Tower Fan

Cooling Tower Fans are used to cool condenser

water in water cooled chiller systems. Water cooled

chillers provide the most efficient means of creating

chilled water. They are as much as 20% more efficient

than air cooled chillers. Depending on climate,

Cooling towers are often the most energy efficient

method of cooling the condenser water from chillers.

They cool the condenser water by evaporation.

The condenser water is sprayed into the cooling

tower onto the cooling towers “fill” to increase its

surface area. The tower fan blows air through the fill

and sprayed water to aid in the evaporation.

Evaporation removes energy from the water dropping

its temperature. The cooled water collects in the

cooling towers basin where it is pumped back into

the chillers condenser and the cycle is repeated.

■■

■ The new standard

With a VLT frequency converter, the cooling towers

fans can be controlled to the required speed to

maintain the condenser water temperature. VLT

frequency converters can also be used to turn the fan

on and off as needed.

Several features of Danfoss HVAC dedicated drive, the

VLT 6000 HVAC can be utilized to improve the

performance of your cooling tower fans application.

As the cooling tower fans drop below a certain speed,

the effect the fan has on cooling the water becomes

small. Also, when utilizing a gear-box to VLT

frequency converter the tower fan, a minimum speed

of 40-50% may be required.

The customer programmable minimum frequency

setting of the VLT is available to maintain this

minimum frequency even as the feedback or speed

reference calls for lower speeds.

Also as a standard feature, you can program the VLT

frequency converter to enter a “sleep” mode and stop

the fan until a higher speed is required. Additionally,

some cooling tower fans have undesireable

frequencies that may cause vibrations. These

frequencies can easily be avoided by programming the

bypass frequency ranges in the VLT frequency

converter.

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