Air Handling Unit with Rotary Heat Exchanges Basic

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Technology Category:
Technology Supplier:
Viking Airtech Pte Ltd
Suitability in Existing Building/New Development:
New Development
Suitability Climate Zones
Hot and humid , Hot and dry
Last Update Date
08/24/2018 17:46:24
Technology Keywords
Energy Recovery, Rotary Heat Exchanger, Energy Savings, Angstrom 3A Sieve, Indoor AirQuality
Technology Description
All exhaust air can be returned to the AHU and the energy previously used to cool or heat the indoor air can be re-cycled and used to re-cool or re-heat incoming fresh air without contaminating the supply air. This will significantly reduce cooling and heating capacity requirements and lowers Energy costs significantly. The cost for a Rotary Heat exchanger are usually saved by reduced size of Chiller and Coils which also direct impact the total investment inform of down sized electrical installations.
Estimated Life Time
15 years
Estimated Lead Time
0 month
Technology Features

Savings in Cooling Capacity 20-50% 

Smaller AHU Evaporator. 

The required cooling capacity will decrease by 10-25kW/m^3/s air flow compared to sensible (temperature only) energy recovery systems.

Smaller compressors, condensers or cooling towers or higher evaporation and lower condensing temperature. 

Smaller electrical connection costs and power consumption in cooling system. 

Lower water flows to cooling coils and smaller pipe works and valves. 

Savings in cooling equipment investments are higher than additional cost of sorption treatment of the rotor. 

Supply air humidification equipment will be smaller, due to high rate of humidity recovery from the exhaust air. 

Lower Running costs for ventilation, cooling and heating. 

Almost constant humidity efficiency provides effective dehumidification of outside air in extreme summer and smaller requirement for raised water temperature to unit gives better working conditions. 

Pay back is 9-36 months compared to no recovery at all subject to % fresh air used and price of energy

Technology Advantages
The Ostberg OM Molecular Sieve 3 Angstrom provides high selectivity for water molecule absorption (2.7Angstrom).

Performance of 3 Angstrom technology is proven in international and independent studies. 

It is recommended in cases where cross contamination needs to be minimized such as hospitals exluding operating theatres that use a separate unit. 

It is used at many hospitals in China, Europe and the USA where there is a need for high fresh air ratio. 

Hospitals in Sweden using the rotary heat exchanger from Ostberg include Falu, Linkoping, Boras hospitals. In Holland Deventer, Maastad Hospital. It is estimated that rotary heat exchangers with 3A technology has been used at 1000 hospitals alone in the USA as well as in Saudi Arabia, UAE. Ostberg has their rotary heat exchanger at The First Hospital of China Medical University, Tianjin Medical University General Hospital, Beijing Children’s Hospital, Shanghai Huashan Hospital and many more as well as government buildings, casinos, hotels, commercial buildings, industry projects, cruise vessels and other marine projects. Minimized Carry Over of VOC’s from exhaust air to supply air.

Technology Limitation
Energy required to drive the belt that rotate the rotary heat exchanger and for additional extract fan in the AHU but this is small compared to savings involved.