TECHNOLOGY | TEMPERATURE CONTROL
Right: The GWK Integrat 80 modular multiple-circuit temperature control system for segmented mould temperature control ensures a high degree of freedom for all temperature control applications
is also possible to supply small- and medium-sized injection moulds with cooling water. The company has also integrat-
Below: Compact temperature control units of the GWK Teco C series with indirect water cooling up to 225°C
ed the Protemp Advanced and Protemp Selection series from Hahn Enersave into its own product portfolio. The Enersave series are temperature control units based on efficient centrifugal pump technology for temperature ranges up to 140°C and a heating capacity from 6-50 kW. This compact series, which has been mainly developed for applications with medium and high flow rates and for combination with water distributing systems, has been using high quality stainless steel centrifugal pumps for many years. Apart from their high flow performance and relatively low energy costs, these pumps are characterised by a long service life and reduced maintenance costs. Due to the design, dimensions and selection of components, the temperature control units are claimed to be efficient, offering comparatively high flow rates. By using an optional frequency convert- er, the efficiency of the standard version can be increased further, and the pump characteristic can be optimally adapted to the actual operating conditions. While compact devices normally use peripheral pumps, these units use centrifugal pumps, enabling high energy cost savings. At a flow rate of 50 l/min and a differential pressure of 3.8 bar, comparative measurements of both pump technologies have shown a reduction in energy consumption of 86% or 1.9 kW. The Enersave series also offers high flow rates of up to 440 l/min at a back pressure of 3 bar, significantly increasing the flow rate range of the GWK compact devices portfolio. In many cases, particularly with medium- and large-sized ma- chines, fewer units per machine are required if Enersave systems are used compared to solutions with peripheral pumps. As a result, savings can also be achieved in installation and maintenance costs. In addition, the units have a small footprint, says the company. Protemp Advanced is available in four sizes
44 INJECTION WORLD | June 2019
(series 1 to 4) and all of them can be offered with direct or indirect cooling. The temperature control units have been specifically de- signed for applications requiring a high level of heat transfer and high flow rates at the operating point – in the presence of back pressure.
Protemp Selection is available in two sizes (series 1 to 2), one with indirect cooling and one with direct. The temperature control units include a selection of the most important equipment features and functions of the Protemp advanced models. The standard version features an
electronic flow rate, pressure and feed and return flow temperature measurement system, touch screen control panel with plain text display,
pump bypass, IP 54 control cabinet, dirt traps
in the return flow from the connected device and in the cooling water inlet, and ball valves in the feed and return flow of the connected device. GWK has also developed the Integrat 80 multiple-circuit temperature control system. The company says that it includes constant cooling water control that is resistant to soiling with a newly developed flow rate measurement unit up to 140°C that does not require moving components. If required, frequency control of the seal-less, magnetically coupled stainless steel pumps is possible. The system has the new GWK ModulCon- trol controller with fast 32 bit processor. It has the logotherm display and control unit that has been independently developed with a 7-inch touch screen on which the most important parameters of up to 24 temperature control circuits are set and adjusted. The processor board has also been designed separately for improved safety and reliability. The inputs and outputs of different circuit boards can be chosen as desired. Other features include the separation of the
hydraulic circuits from the electrical functional parts, a high level of flexibility, as well as low space requirement. The use of IE-3 motors on the magnetically coupled stainless steel pumps as well as the option to now operate up to 24 temperature control circuits via a single interface to the process- ing machine have been added. The temperature control system can be expand- ed to a maximum of 96 temperature control circuits with the aid of the VTC 4-way distributor, where the actual values of the flow rate and the temperature
www.injectionworld.com
PHOTO: GWK
PHOTO: GWK
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