08 April 2009
Abbey National Bletchley
A continual challenge is the supply low noise Dry Coolers to various hospitals and hotels, where the night time noise levels of our equipment had to be considerably lower than the background noise levels due to proximity of equipment to hospital wards and guest rooms. To achieve these critically low noise levels on our units, Guntner's Research and Development department developed new electronic noise filters to reduce fan motor noise. By fitting filters to our units in conjunction with Guntner variable speed controllers, extremely low noise levels can thus be achieved.
For a project for Abbey National Bank the design criteria was set at 33dB(A) due to proximity of site to a residential area nearby. The noise level required equates to noise levels similar to that of a fan coil in a hotel bedroom at night time. The twelve dry cooler fans running at 100% speed rotate at 340rpm drawing a mere 0.44A per fan with a combined power consumption of 2.22kW giving the unit an energy efficiency class rating A. If one can now visualise 4 of these condensers (which were required on this project) with each unit being the size of a 40ft lorry, one can perhaps appreciate the technology that goes into our engineering and the design of products to achieve such low noise levels.