GEA

GEA Heat Exchangers | GEA Polacel Cooling Towers

GEA Polacel designs, manufactures and maintains cooling towers. Our company is synonymous with quality and innovation in this area. We have been building cor¬rosion-free cooling towers since 1967, and we are still in the lead when it comes to efficiency and noise reduc¬tion. GEA Polacel backs up the quality it delivers with all the appropriate guaran¬tees and a complete service organi¬zation. This is how we offer our customers the reas¬surance of complete security.


GEA Polacel designs and manufacturers cooling towers with long lifetimes and minimal maintenance needs. This is achieved through the materials used stainless steel combined with glass fibre and plastic, the sound design and the experience of our engineers.The result is a cooling tower that is low maintenance, energy efficient and able to supply constant excellent problem-free performance.


The GEA Group, headquartered in Bochum, Germany, is a globally successful technology group with more than 250 companies in 50 countries.


The company now focuses on specialty mechanical engineering especially process engineering and equipment. GEA Group technologies are applied in the food, chemical and petrochemical industries, the energy sector, air treatment and shipbuilding as well as the pharmaceutical and cosmetic industries. The GEA Group is one of the world`s market and technology leaders in 90 per cent of its businesses.


GEA is a solid foundation for the Polacel activities and it provides us with greater scope. Good contacts with affiliated organizations that are leaders in our field provide an ongoing stimulus to our own development. This is what makes Polacel a leader in the introduction of technological improvements. GEA is a solid foun¬da¬tion for the Polacel activities and it provides us with a greater scope. Good con-tacts with leading affiliated organizations in our field provide an ongoing stimulus to our own development. This is another reason why Polacel is a leader in the introduction of technological improvements.


GEA Polacel Cooling Towers has demonstrated it has a documented and implemented quality management system that conforms to the standard NEN-EN-ISO 9001:2008. The quality management system has been evaluated in accordance with the procedures for systems certification of TUV Nederland for the scope of activity: Design, production, sales, assembly and maintenance of cooling equipment.


GEA Polacel Cooling Towers has demonstrated a SCC-system (SCC = Safety Certificate Contractors) which complies with the requirements of the guideline SCC** (2008/05). The SCC-systems has been evaluated according to TUV Nederland's certification procedure for the following scope: Production, assembly and maintenance of cooling equipment.



CTI Certificate



Cooling tower models


    Cooling tower models                            Type   Technique Description

CMC Counterflow GRP walls, SS support, transportable by truck



                                                                         CMDR Counterflow GRP walls, SS support, geared motor
                                 



CMDI Counterflow GRP walls, SS support, motor outside airflow
 
                                                                         
 
                                                                            XT   Crossflow Trans­portable by truck, excellent noise performance



                                                                          XL       Crossflow    Large version of XT, also trans­por­table by truck





                                                                XM Crossflow Modular tower, mounted on site, for large water flows




Cooling tower technology


Open evaporative cooling tower


The extensive name for cooling tower is open evaporative cooling tower. Cooling towers are able to draw off heat from a process or a cooling cicle in an efficient way. In a cooling tower, water is put in direct contact with surrounding air. A small part of the cooling water, i.e. 1-2%, evaporates. This evaporation causes an increase in temperature and humidity of the air and a decrease of the temperature of the water. By using the evaporation, it is possible to cool below the normal air temperature. The minimal realisable temperature is the wet bulb temperature.


Forced draught cooling tower


Fans cause a continuous air draught. When the fan is blowing, the apparatus is on overpressure, which is called forced draught. In contrast, when the fan is sucking, we have underpressure, which is called induced draught. For cooling towers with a forced draught, 2 types of fans are possible: axial (plate with blades) or radial fans (snail-shell). The disadvantage of a radial fan is that it produces more sound and that it has worse profits. The figure below shows the possible configurations of a counterflow cooling tower.


Counter flow


CMC and CMD cooling towers work on the prin¬ciple of counter flow. This means that the water flows down while the air is pulled upwards by a fan. As the water flows further through the system, the air it encoun¬ters is fresher, in other words cooler and less saturated with moisture. Counter flow cooling towers can approach the wet bulb temperature better compared with cross flow cooling towers.


Cross flow


Using the cross flow principle, warm water flowing down through a cooling unit is cooled by air drawn upwards by a fan. Evapo¬ration and direct heat exchange cause a rapid drop in tem¬pera¬ture. Compared to counter flow cooling towers, induced-draught cross flow cooling towers are much quieter and smaller. The perfor¬mance figures are next to perfect. Beside counterflow cooling towers, Polacel developed 4 types of crossflow cooling towers. In these cooling towers the water contacts the air in crossflow. The exchange efficiency is lower, so that the cooling tower needs to be larger. However, crossflow cooling towers are often preferred because they produce less sound (no sound of falling water), are lower and use less capacity.