Environmentally friendly cooling – Is that even possible?

Yes, others have tried before us, but we refused to give up and were not discouraged by the early set-backs. It was a long process, but successful in the end. And it really works: Our eChiller uses direct evaporation of water in a vacuum-sealed, closed-loop system that is hydraulically separated from the cooler and refrigeration point by braze plate heat exchangers.

The clever process:

1. Water enters the eChiller evaporator. There, approximately only 1 % of the water evaporates in a vacuum atmosphere, which cools down the remaining water by about 6 K.

2. The ensuing water vapor is then compressed by the turbo compressors at up to 90,000 rpm to at most one third of its original volume, causing the pressure and temperature to rise.

3. In the condenser, the heated water vapor condenses directly into the circulating cooling water stream, which it heats up, also by about 6 K. The cycle is closed by a self-regulating expansion device.

The energy saving feature:

Thanks to the modular design of the system and the hydronic interconnection of the two modules, only those required to achieve the needed temperature lift go into operation.

The modular design of the system makes it possible to operate only those components needed to achieve the required temperature difference by interconnecting the cooling units as a function of the internal heat load and outside temperature.

The transitions are fluid and range from two-stage, full-load capacity to single-stage operation and even a pure free cooling mode. But, unlike other conventional refrigeration systems with “free cooling” modes, eChiller’s internal passive cooling kicks in even when outside temperatures are only marginally lower than the cold water intake temperature.

Feasible cold water temperatures start at 10 °C. As a result of the system design, cold water temperatures of 22 °C and above, which conventional cooling systems cannot work with, are especially efficient. Here, eChiller 2-35 achieves a cooling capacity of 35 kW.

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