Modulo lingua

Centrifugal cooling towers series TRCParticular of the evaporative package and nozzles benchSingle aspiration centrifugal tower series TRC

TECHNICAL SPECIFICATIONS OF WATER COOLING TOWERS WITH CENTRIFUGAL FANS – TRC SERIES

PANELING

Construction in galvanized plate, minimum thickness 20/10. All the panels are edged to make the unit more robust and they are assembled through galvanized bolts. A special silicon mastic, which permanently maintains its elasticity, is used to seal the panels together.

 

WATER COLLECTING BASIN

Even the water collecting basin is made up of galvanized plate panels of the same thickness as the casing, assembled through galvanized bolts.

A special waterproofing material is applied inside to ensure its seal. The basin is complete with junctions for the make-up water inlet,  for the “overflow”, the chilled water outlet and the drain. The inflow of make-up water is controlled by a copper floating valve. A bypass between the water inlet and the “overflow” allows the continuous drainage of part of the return water, thus controlling the concentration of salts in the circuit.

 

CARPENTRY CORROSION PROTECTION

To increase corrosion resistance, already ensured by the use of galvanized plate, all the cooling towers are painted externally (SCAMBOND/HYB protection cycle) and bitumen coated inside.

 

HEAT EXCHANGE FILLING

The heat exchange filling is made up of a PVC honeycomb structure. The honeycomb structure with vertical grooves ensures a low pressure loss on the air flow and eliminates the possibility of stagnant water. The exchange filling is suitable for temperatures below 50°C, it is resistant to decomposition from biological or fungal attacks, and it is self-extinguishing.

 

RACK OF SPRAYING NOZZLES

Made up of a supply manifold (two on the double models) and nozzles galvanized steel racks, with removable nylon nozzles. The diameter of the nozzles is large enough to avoid any blockages. The nozzles rack ensures an uniform distribution of the water to cool on the heat exchange filling.

 

DRIFT ELIMINATORS

The drift eliminator is made up of PVC and is fitted above the nozzles rack, with the purpose of preventing the entrainment of water drops, due to the air flow, outside the tower. The shape of the eliminator minimizes the pressure loss on the air flow.

 

FAN SECTION

Dual intake centrifugal fans, made up of galvanized plate, with impeller keyed on a cadmium-plated steel shaft, supported by ball bearings, and coupled to the electric motor by a V-belt and pulley drive. Closed IP54 electric motor, of external ventilation, fitted on belt tightening slides inside the fan section.

 

ACCESSORIES

  • - Electric anti-freeze resistances
  • - Room thermostat for anti-freeze system control
  • - Oversized fan motors for a useful static pressure of 100 Pa on the air flow
  • - Dual polarity fan motors (4/8 poles or 4/6 poles)
  • - Type “A” silencers for noise attenuation equal to 10 dB(A)
  • - Type “B” silencers for noise attenuation equal to 20 dB(A)

In the case of a series of towers operating in parallel, it is foreseen a predisposition for the equalizing connection between the water collecting basins.

The cooling tower is not equipped with an electrical panel, therefore the electric motors have to be connected by the customer.

 

WORKING DESIGN CONDITIONS OF COOLING TOWERS

The cooling towers for air-conditioning are normally chosen for standard water temperatures: conventionally we accept a water inlet temperature of 35°C, with an outlet temperature of 29.5° C. The temperature difference is thus fixed at 5.5° C. In any case, the minimum outlet water temperature will never be less than the wet bulb temperature of the outside air plus 2 - 3° C. As it is known, the tower is chosen with reference to the heat that must be dispersed and the wet bulb project temperature outside. At this regard, it is nonetheless necessary to consider possible brief increases in temperature that may occur in the summer, in the period of maximum cooling demand. To avoid the risk of refrigerating units overloading, it is good practice to select the tower for a wet bulb temperature around 2°C higher than the project temperature of the location. This detail, as well as preventing overloads, will allow operation with less energy consumption by the refrigerating unit over the entire season. For the process cooling, in the industry are frequent warm water temperatures up to 85°C. These may require the replacement of the standard honeycomb media and of the drift eliminator, with the special model for high temperatures.

 

Download PDF datasheet