gwk puts its climate-friendly products in the focus of the K 2019 trade fair

In the "K Efficiency Lounge", the specialist for cooling and temperature control systems informs about the available technologies, associated government-provided subsidies and future trends.

Due to the current discussions about climate change, resource-efficient products are at the centre of interest at this year's leading trade fair. Innovation and efficiency have always been a major aspect of the product development at gwk Gesellschaft Wärme Kältetechnik mbH from Meinerzhagen. At this year's trade fair stand, visitors will receive special information about CO2-reducing measures and the associated government-provided subsidies in a gwk efficiency lounge which has been specially designed and set up for this purpose.

A single gwk enersave temperature control unit can reduce CO2 corresponding to the emissions of 62 domestic flights


A medium-sized temperature control unit with enersave technology, for example, reduces the CO2 emissions by the amount that is caused by one person on 62 domestic flights from Cologne to Munich.


A temperature control unit with a standard 120 l/min peripheral pump supplies approximately 88 l/min with a pressure loss of 3 bar and requires 2.15 kW of electricity to do so. A temperature control unit with a 120 l/min centrifugal pump also supplies 88 l/min with a pressure loss of 3 bar, but this pump requires only 0.82 kW of electricity to do so. As a result, the difference in current consumption is 1.33 kW or 7,714 kWh/year based on 5,800 annual operating hours. With a conversion factor of 0.537 kg CO2/kWh, this results in an equivalent CO2 emission of 4,142 kg/year.


For comparison: According to the ICAO carbon emissions calculator (ICAO = International Civil Aviation Organization), the average CO2 emission value of a domestic flight from Cologne to Munich is a mere 65.9 kg/person.
Although the gwk enersave technology with centrifugal pumps is not a brand new technology, it is becoming increasingly important due to the high energy saving potential that has been proved time and again by measurements conducted by actual users. Due to this effect, the highly efficient enersave series will be at the focus of interest of this year's trade fair presentation.


The government funding that is available when using this highly efficient technology is another new aspect. Since the beginning of this year, up to 40% of the eligible costs can be subsidised by an efficiency programme established by the German Federal Ministry for Economic Affairs and Energy.

Highly efficient series already available with OPC-UA/EUROMAP 82.1


The entire enersave series of temperature control units is already available with the new EUROMAP 82.1 interface. This means that integrated speed-controlled pumps and other specified set values can be controlled via the machine control system. Data and alarm logging is now also possible within the control system of the production machine.


Water distribution systems with ultrasound flow measurement technology can be connected directly to the unit


Thanks to the special connectivity of the enersave system, proflow water distribution systems with non-contacting and maintenance-free ultrasound flow sensors can be connected directly to the unit without an additional operating panel. The system can be visualised not only by the temperature control unit, but also by the control system of the machine thanks to the data transfer via OPC-UA. Byextending the communication cable, the distribution system can be installed inside the machine close to the mould without any problems.

Efficiency as a key feature of numerous gwk products


gwk will also present products for special applications, e.g. variothermal processes, which stand out from the market thanks to their special efficiency features, for example the teco vario and integrat evolution systems.


The teco vario system, which is mainly intended for planar applications, has an innovative valve switching unit that enables the low-loss switching between hot water and cold water close to the mould. High heat output, for example for larger segments or moulds, is also easily possible with this system. In the case of the integrat evolution system, which has been developed for the elimination of weld lines, the short-term temperature increase, which is necessary for the process, is realised by way of special ceramic heating elements directly inside the mould and thus close to the cavity. With this approach, the heating energy can be introduced in a targeted manner and with a particularly low level of heat loss, thereby enabling rapid heating and cooling.


The integrat direct water distribution system with an active control system is characterised by its particularly robust and energy-efficient control valves. Compared to standard proportional valves, the valves used in the gwk system require up to 48 times less energy and are less sensitive in terms of contaminants in the circulating water.  

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