The pressure exchange system (P.E.S.) - which was originally designed for the hydraulic transport of coal - represents the first step into the development of this technology.
The patented P.E.S. allows the alternate inflow or outflow, respectively, of water from a high pressure to a low pressure piping system and vice versa.
In underground mine or tunnel cooling, the P.E.S. system represents the interface between the cooling system on surface - which produces and provides the cold water via the shaft pipes at high pressure to the underground - and the underground piping network, which supplies the cold water at low pressure to the roadway coolers.
The particular advantage of the P.E.S. is the minimal temperature increase (<0.5 °C on an average) of the cold water during the transfer from high pressure to low pressure, resulting in a higher efficiency in the cold water transport and a constant efficiency level for the P.E.S. service life as well.
For more than 25 years now, the P.E.S. is applied in significant centralised mine cooling systems all over the world. In cooperation with end users and appropriately experienced companies, concepts for mine and tunnel cooling were designed and realised, best optimised with regard to operating costs and climate efficiency.
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