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User report


Control room fully air conditioned with well water.


Drewsen consistently relies on cooling the control rooms with well water. As a result, energy cost can be reduced drastically and the use of chemical refrigerants is completely redundant. By this measure, the environmental aspect is consistently implemented.


A special requirement in this project was that the control room was not air conditioned conventionally via a raised floor, and therefore other cooling possibilities had to be designed.


The switchgear in the control room on the ground absorbs the cooled air and emits the heated air back above the switchgear. The challenge to meet this particular requirement without a raised floor was given to BM Green Cooling. Furthermore, the alterations were carried out during operation of the switchgear.


Special climatic cabinets were installed above the room. These were connected to a ventilation duct system to the electrical room.



Picture: Construction of special climatic cabinets above the control room 



In the control room below the ceiling, a complex ventilation duct system was installed. It consists of several supply air ducts, which allow the air to flow down. The ventilation grids were designed so that the air volume flow can be aimed flexibly at hot spots in the room.


This technique can react flexibly to new demands in the control room in case of extensions to the switchgear.


In order to remove the warm air from the room, the ventilation ducts were installed directly above the switchgear.

Picture: Control Room with targeted supply air supply center and extraction above the cabinets in the control room



The heated air is then routed to and cooled at both climatic cabinets.

In order to keep the consumption of well water as low as possible and to increase the efficiency of the system, certain components have been installed, for example in the piping system. The entire control of the system components, such as fire shutters or valves, etc., is regulated and monitored by the climate cabinets with integrated Siemens control. Each climate cabinet has its independent Siemens control, each with a color touch panel.

These controls both work independently, so that a failure of one system does not lead to a complete shut-down. So a partial redundancy in systems engineering was achieved. Furthermore, the controls can be crosslinked with other control devices in the plant, since the plant was built according to the current factory standard.

The cooling with well water or river water is still the most effective and operationally cost-effective option for cooling control rooms in the paper industry. One aspect which should not be underestimated is that with this technique no mechanical cooling is required and the demand for electricity for cooling the control rooms will be reduced dramatically. The heated cooling water is then subsequently used for the paper production.


Main system advantages:
-    Highly energy efficient overall solution
-    Investment relatively low, as usually existing wells can be used
-    No site for cold generation with compressors necessary
-    No site for liquefier / recooler necessary
-    Considerably lower service costs than conventional compressor refrigeration systems because

     of fewer system components and no need for leak tests of refrigerant
-    No system components are exposed to possibly existing aggressive air
-    Use of heated cooling water for paper production
-    No use of any chemical refrigerants, ozone depletion potential = zero
-    Compliance with the work standards in the field of control technology (Siemens S7) ensures

     the incident processing through the customer’s on-site building services



Energy requirement comparison for different ways of cold generation


Power requirement compressor cooling 73 kW                                  Power requirement well cooling 15 kW



CO2 emission per year comparison for different ways of cold generation

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