Twelve-hour flight. Finally get to the hotel. Check in and then take a little snooze. The room is pleasantly cool, in contrast to the warm night outside. But there’s no chance of getting to sleep: The air-conditioning unit under the window is droning endlessly. Then a little less cooling will just have to do. The room gets warmer, but the noise remains. The receptionist apologetically shrugs his shoulders and offers you another room with modernised air-conditioning technology. Absolute silence rules there. And yet it is comfortably cool. No air-conditioning unit is in sight.
Good climate, low costs
The air-conditioning technology is integrated into the ceiling in the entrance area. The cooled air flows into the room through a narrow grille. And it does so without any sound at all. Concealed behind the ventilation slots there is a convector, which is called a fan coil unit. It consists of a GreenTech EC centrifugal fan and a heat exchanger. The fan circulates the room air and causes it to flow over the heat exchanger. In summer it cools using cold water, and in winter it heats using warm water. This way the room temperature can be controlled as desired. If the systems are connected to air ducts, they bring in fresh air. Air-conditioning devices installed under the window also use fan coils to circulate and control the temperature of the room air. In hotels, the devices are switched on an average of 292 days a year, usually in partial-load operation. As important components, therefore, efficient fans are particularly in demand. Investment in new fan coil units with GreenTech EC centrifugal fans pays off: They get by with up to 70 percent less energy. “As a result, the extra investment for GreenTech EC technology is amortised in a short time,” emphasises Uwe Sigloch, Ventilation and Air-conditioning Technology Market Manager at ebm-papst. Aside from this, the compact fans can be quickly and easily integrated into the existing air-conditioning technology as a pre-assembled plug-and-play solution.
The centrifugal fans have outputs between 40 and 250 watts for integration into air-conditioning systems. They deliver air volumes of up to 2,200 cubic metres per hour. Depending on the room size, there are individual, twin or triplet fans available with various motor outputs. The objective is to generate the most uniform air flow possible. If only one fan with high output is used, the outflow is too limited to one location. For very large spaces, multiple individual or double centrifugal blowers are combined and then work in parallel. GreenTech EC centrifugal fans master their task reliably and quietly. The fan unit consisting of impeller, motor and control system, specially tuned to one another, significantly reduces the noise level. The lightweight but robust plastic housings not only protect the convectors, but also act as acoustic insulation. By means of infinitely variable control, the hotel guest can easily adjust the room temperature to his or her personal needs. Then there is nothing more to stand in the way of a restful sleep – so your meeting can start as planned the next morning.