Air Climate System ? Twin Wheel Reducing the cost of humidity control
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Air Climate System – Twin Wheel Reducing the cost of humidity control

Twin Wheel system – humidity control and energy saving The Twin Wheel might not be as important to humanity as the wheel. But within the air treatment business we still consider this system a landmark innovation, and it creates a high indoor air quality as well as energy savings for the benefit of our common environment.

Air quality Today we demand a comfortable environment when inside a building. One important parameter for a good indoor environment is the air quality. Good indoor air quality in turn is a combination of factors like oxygen level, humidity, absence of odor and pollution and obviously the right temperature. Energy costs Cooling and heating processes typically demand high levels of energy supply. In modern buildings air treatment is often the biggest consumer of power. This fact, together with constantly increasing global energy prices, call for systems optimized for best overall efficiency....

How does the Twin Wheel system work? Fläkt Woods has designed the Twin Wheel system to improve on cooling and humidity control versus other solutions on the market. The purpose is to produce cool and dry air while lowering the cost for these processes compared to conventional systems.

The components of a Twin Wheel system Rotary heat exchanger Rotary heat exhangers are used for heating and cooling recovery in air handling systems and typically enhances their efficiency. The rotary heat exchangers main component is the rotor, which is made of either thin folded sheet aluminium or micro-glass, formed as triangular pipes. Sensible rotor When spinning, the rotor transfers heat or cold between supply and exhaust airstreams. In this case, where the exchange is restricted to temperature transfer, it is called a ‘sensible’ rotor. Hygroscopic rotor Through surface treatment the...

Twin Wheel advantages in overview The Twin Wheel system contains three main parts; the hygroscopic rotor, a cooling coil and a sensible rotor. When outdoor air is warmer than the exhaust airflow there is a need for cooling. The hygroscopic rotor then reduces temperature of the incoming air. Simultaneously it transfers moisture from the inbound to the outbound air flows (in cases where absolute humidity is higher outdoors) After passing through the hygroscopic rotor the air passes through the cooling coil, where the temperature is reduced further and moisture is condensated down to required...

Relative moisture content, x/xs 0·90 Moisture content per kg dry air x, kg/kg Count on savings Now let’s see what the Twin Wheel system can achieve in real life! The situation is a typical setup where there are specific demands on both temperature and humidity to maintain a good indoor climate. Enthalpy per kg dry air, kJ/kg, kcal/kg Air flow rate 5 m3/s • Outdoor condition: 29°C dry bulb, 50% relative humidity Required supply air condition: 20°C with 8 g/kg absolute humidity Exhaust air design condition: 23°C with 9 g/kg absolute humidity 5.0 m3/s 16.1 9.5 The total cooling demand is 184.4...

When the pieces fit, you get the big picture With our broad range of products and century-old experience, one thing is obvious to us; You have to look at the big picture. It is by carefully combining products into systems, utilizing smart controls, one can achieve the best energy solutions. Air handling units Our comprehensive Air Handling Unit offering allows us to deliver optimised solutions for any customer. Our R&D work focuses on reducing energy consumption and creating factory complete air handling system solutions with controls. Our experience in the marine, off-shore, pharmaceutical...

Chilled beams In systems with Chilled Beams, the indoor air is cooled by means of cold water. Chilled beams create a stable and comfortable environment by supplying draught free cooling. By using Chilled Beams up to 75% of the total cooling capacity will be handled by the water. Apart from the energy saving it also means less ductwork for air, smaller air handling units and lower noise. e3 – Fläkt Woods Integrated advantages Chillers The Fläkt Woods range of chillers are designed to minimise the overall annual energy consumption in all types of buildings. Fläkt Woods’ heat and cooling...

By means of the twin rotor system the cooling demand on the chiller is reduced by one third to 300kW and the reheat demand is eliminated. Akropolis shopping center Kaunas, Lithuania Kaunas AKROPOLIS will be the biggest shopping centre in Kaunas and in central Lithuania, with a wide selection of national and international stores. The AKROPOLIS shopping centre in central Lithuania will attract customers from all over Lithuania and neighbouring countries. The Akropolis shopping centre in Kaunas, Lithuania includes an ice rink. To avoid fog in the area around the rink it is necessary to supply...

Further references Unilever, Kingston, UK Manchester Metropolitan University, UK Fitzrovia, London, UK M W Kellog, London, UK 227 Tottenham Court Road, London, UK Bidborough House, London, UK Greenwich Peninsula, London, UK John Dalton Building Manchester, England Four Twin Wheel systems were supplied to the John Dalton Building at Manchester Metropolitan University. This building is for the Department of Computing and Mathematics which houses their own teaching and research laboratories offering person-centred working and learning environment for staff and students. Research is carried out...

Our constant aim is to provide systems that precisely deliver required function and performance, as well as maximise energy efficiency. Solutions for all your air climate and air movement needs Fläkt Woods is providing solutions for ventilation and air climate for buildings as well as fan solutions for Industry and Infrastructure. Air Handling Units (AHUs) Modular, compact and small AHU units. Designed to ensure optimisation of indoor air quality, operational performance and service life. Advanced axial, centrifugal and boxed fans for general and specialist applications. Comprehensive range...