Indirect Dynamic Free Cooling

The Free Cooling system with dynamic switching operation and control

In classic precision cooling, the necessary cold is created independently of the outside temperature by means of mechanical cooling. The most energy-intensive component here is the compressor.

To reduce mechanical cooling to a minimum, STULZ developed a Free Cooling system with dynamic switching operation and control for in-house units. This controls all active components, dependent on the outside air temperature and current heat load.

The dynamic switching operation and control reduces the compressor running time to a minimum and reduces the total energy consumption by up to 60%, taking into account all active components.

The system cools precisely and dynamically according to the current heat load. This means that only the required cooling capacity is ever generated and there is no energy-intensive oversupply. Taking into consideration outside temperature and current heat load, the dynamic switching operation and control selects the optimum operating mode without a fixed Free Cooling start value.

If the outside air temperature is 3 Kelvin under the return air, the outside air can even be used for cooling. The Free Cooling periods are maximized by the dynamic switching operation and control and extended Free Cooling, reducing operating costs to a minimum.