Kaltra’s adiabatic cooling unit is a high-tech piece of equipment that can operate in a variety of operating modes. In low-temperature conditions, it operates as a standard closed-loop dry cooler. When the ambient temperature rises, a unique adiabatic chamber is activated that injects fine water to pre-cool the air before it enters the air heat exchanger. In high-temperature conditions, a third mode is activated, an auxiliary function where water is sprayed directly onto the cooling coil. The original and high-tech design prevents stagnant water and reduces the risk of legionella bacteria to a minimum.
The main characteristics of Kaltra dry coolers:
- The temperature of the cooled glycol inlet to the plate heat exchanger is controlled by an electronic controller built into the electrical panel of the BF main unit. It is recommended to set the glycol temperature at 4 ° C lower than the required leaving water temperature.
- To prevent water freezing in the plate heat exchanger when starting the free cooling system after a long stay at low ambient temperatures, a glycol tank is built into the hydraulic circuit of the main unit, and a bypass line is provided for manual start at outdoor air temperatures below “-20 C”.
- The BF free cooling unit is switched on manually by pressing the START button on the control panel (the control panel is built into the main unit). As a rule, they turn on the free cooling unit in the fall when the outdoor temperature drops to +5 C. As an option, it is possible to install a controller and an outdoor temperature sensor to automatically turn on the free cooling unit when the ambient temperature reaches the set point. If the outlet water temperature rises above, the compressor will turn on and cool the water to the set temperature.