Cooling

Central cooling supply

In order to supply your on-site operation in the Kalle-Albert Industrial Park with process and ambient cooling, InfraServ Wiesbaden operates a central ammoniac-refrigeration unit with an installed cooling capacity of 24 MW.

Cooling is generated by seven ammoniac screw compressors with cooling capacity units of 2.5 to 6.5 MW.

Cooling is supplied to you by two ammoniac refrigerant circuits (-5 °C  and -15 °C) and one chloride brine refrigerant agent circuit (-8 °C).

The implementation of these generators is redundant, meaning that supply is secured even if one of the generating units should fail.

Cooling process

In a hot and gaseous state, the saturated ammoniac gas aspirated by the compressors gets compacted and is cooled and liquefied under pressure in the water-cooled tubular liquefiers. The heat generated in this process is released to the ambience.

The liquid ammoniac is conducted to the evaporators via the refrigerant tubes. In the evaporator, the liquid ammoniac gets devolatilized. The evaporator is designed as a sole cooling unit (heat exchanger). In the course of the evaporation of the liquefied ammoniac, heat is detracted from the sole circuits that circulate between the evaporator and the operative unit (cooling of the sole circuits). The gaseous ammoniac generated in the evaporators is conducted to the saturation cylinders via a liquidity separator and an additional heat exchanger through the refrigerant suction tube (suction gas net).

The overheated stream of gas in the heat exchangers of the evaporators has to be transformed into saturated steam again prior to compression. This happens in the ammoniac saturation cylinders by way of injecting liquid ammoniac. The saturated gas is conducted to the compressor, where the cooling process concludes and starts over.

Cooling distribution

Refrigerants (evaporator stations) are distrubuted via a shared ammoniac-liquidity network (flow line) and two gas-suction networks (-5 °C and -15 °C, return flow).

The distribution of refrigerant agents is conducted via a chloride brine network (flow line/return flow), which is limited to the proximity of the central cooling unit.

The distribution of refrigerants and refrigerant agents to you as a customer is done via a pipeline network supported by pipe racks. The networks are partially circuit-shaped and partially radiant. Every evaporator or device is subject to a quantity measurement to allow for an individual accounting for consumption. Consumption is monitored online and charged according to the reference measurement.