How spraying can improved heat exchanger performance
Spraying coils with water can significantly improve the performance of finned heat exchangers. Especially in refrigerating plants implementing free-cooling (e.g. for the cooling of server racks) considerable energy savings can be realised. The COP can be improved by up to 40 % through using a spraying system in high ambient temperatures to lower the condensing temperature.
These advantages may be fully exploited and maximised by using the appropriate fan and spray control system.
With the new, internally developed HydroSpray® System, Güntner offers a spraying system with numerous application advantages. For perfect control of this unique spraying system, Güntner Controls developed the Güntner Hydro Management – the controller GHM spray.
The controller GHM spray controls the water spraying depending on the demand from the heat exchanger and the measured temperature and pressure. Two systems are available, the Güntner Motor Management (GMM) with GHM spray basic and the GMM with GHM spray professional.
GHM spray basic
The basic variant is a single-stage system that activates spraying at a defined switching point and sprays all the fan chambers up to 300 h/a.
Depending on different parameters, e.g. pressure or temperature, the controller manages an even spraying of the heat exchanger to attain an increase in capacity in the peak load range. All GHM controllers are parameterized in accordance with the GPC calculation for the units, so the operating parameters are already adjusted to the geographical location of the units.
GHM spray professional
The GHM spray professional controller ensures that a maximum increase in performance is achieved over a spraying time of up to 1,000 h/a. The water consumed is 50% of conventional systems in the market. Another feature is the automatic vacuum drainage which ensures that spraying is always carried out with fresh water and that no water is left standing in the unit in the winter.
The highlight of the GHM spray professional, however, is the so-called Section Cycling, which is able to control up to 9 heat exchanger sections individually. This means that the heat exchanger is sprayed in sections, thus reducing water consumption. Moreover, the heat exchanger’s performance is thus adjusted in very small steps, maximizing the life of the heat exchanger.
H. Guntner (UK) Limited
Coliseum Business Centre,
Riverside Way,
Camberley, Surrey,
GU15 3YL
Telephone 0844 22 50 600
info@guntner.co.uk
www.guntner.co.uk
