Design, construction and performance evaluation of a constant air volume device for HVAC systems

Kiper, Caner Ekin
Everything that is used by humans in daily life is designed to increase the quality of life of people. This shows that comfort may be the last thing human beings are willing to give up. Heating, Ventilating and Air Conditioning (HVAC) systems are also designed to increase life standards in enclosed environments such as meeting rooms, offices, concert halls etc. People feel more comfortable when the ventilation system and ambient temperature is set properly. However, in some situations, setting the operating conditions to the right value is not an easy task. This might require a more detailed analysis employing different type of ventilating methods. Sometimes combining various methods could be a solution or even designing a completely new system that satisfies the need of the people may be necessary. This thesis aims to provide a design and test procedure for constant air volume (CAV) device for Heating Ventilating and Air Conditioning (HVAC) systems. CAV unit closely resembles a butterfly valve. Pressure loss and moment characterization according to blade angles are obtained by means of several experiments and numerical studies. These experiments are explained in detail. Obtained data from experiments are compared to validate CFD analysis results. The CAV unit supplies constant air flow rate even if differential pressure over the unit changes. In order to obtain a constant air flow rate, a control mechanism is proposed and details of it is given.


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Citation Formats
C. E. Kiper, “Design, construction and performance evaluation of a constant air volume device for HVAC systems,” M.S. - Master of Science, Middle East Technical University, 2018.