GEA Heat Exchangers has upgraded its Adia-DENCO central cooling system, designed for climate control of computer.
The new version is claimed to be more compact and requires less energy than the first version. The new models are said to save up to 70% in cooling energy, depending on design temperatures.
Based on the GEA CAIR air-handling units, it exploits both free cooling as well as indirect adiabatic cooling to dissipate heat. As a result, operation of an additional refrigeration system is claimed to be often unnecessary, or can be restricted to only a few hours per year.
Adiabatic cooling – cooling by evaporation – takes place with the GEA Adia-DENCO in a large double-plate heat exchanger. This heat exchanger humidifies warm outdoor air, which cools it.
This air cools the hot return air from the computer center by means of hermetically sealed heat exchange in the recuperator. The air in the computer center is therefore cooled in recirculated-air mode, and it is hygienically separated from the flow of outdoor air.
Previously in such systems, the humidification of outdoor air took place in front of the plate heat exchanger. The new, improved nozzle configuration directly sprays the water onto the plates of the heat exchanger. This direct process procedure not only increases the cooling duty of the adiabatic system, but also reduces the dimensions of the system casing.