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School of Civil Engineering

School of Civil Engineering. Integrating Heat Transfer Devices Into Wind Tower Systems to provide Thermal Comfort in Residential Buildings. John Kaiser S. Calautit Supervisors: Dr. B. Hughes and Prof. N. Wright 3 rd CFD Group Meeting. School of Civil Engineering. (Macro Climate) ( (.

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School of Civil Engineering

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  1. School of Civil Engineering Integrating Heat Transfer Devices Into Wind Tower Systems to provide Thermal Comfort in Residential Buildings John Kaiser S. Calautit Supervisors: Dr. B. Hughes and Prof. N. Wright 3rd CFD Group Meeting

  2. School of Civil Engineering (Macro Climate) ( ( - Leeward (Macro Climate) ( ( + Windward Wind Tower – Natural Ventilation Device Traditional Architecture Commercialized Re-Engineering Fresh Air In Windward (+) Leeward (-) Stale Air Out Buoyancy and displacement effect (driving forces) (Micro Climate) • Originated from the Middle East (hot and arid regions). • Bring the technology back to the Middle East using heat transfer devices powered system. • Incorporated with advance technology (control dampers, ceiling diffusers , solar panels) John Kaiser S. Calautit

  3. School of Civil Engineering Looking into Wind Tower Systems – Airflow Analysis • Two 4-sided wind tower system (2 floor residential building) • Average indoor airflow of 0.4 m/s • Supplies airflow at ceiling level • Increased the indoor airflow by up to 60% John Kaiser S. Calautit

  4. School of Civil Engineering Traditional Evaporative Cooling (Controlled Test): Existing Cooling Technology 310K Inlet 310K Injected Water 0.05 kg/s, 293K 297 K Disadvantages: Water - scarce Pump – continuous power supply High Tower – not feasible in urban areas 297 K Outlet Wind Tower Channel with Evaporative Cooling (Published Data) John Kaiser S. Calautit

  5. School of Civil Engineering Aims and Objective: 1. Integrate heat transfer devices into a commercial wind tower system for the Middle East. Top Hat Condenser Louver Heat exchanger system Adjustable Dampers Evaporator John Kaiser S. Calautit

  6. School of Civil Engineering 2. Optimize the thermal comfort of a Qatari residence using the proposed wind tower system. Predicting thermal comfort using PMV model software. Hottest Month • Predict Thermal Comfort • Required Indoor Temperature? • Required Indoor Velocity? John Kaiser S. Calautit

  7. School of Civil Engineering Challenges: Reduce the indoor temperature by 10-12K to achieve thermal comfort during summer periods. Achieve minimal restriction in the external air flow stream while ensuring maximum contact time. Supply up to 400 L/s Compact Design - Fit the heat transfer devices and cool sink inside wind tower. Cool Sink Dust John Kaiser S. Calautit

  8. School of Civil Engineering CFD Results : Airflow Analysis – Louver Angle (Components) 1 m/s 1 m/s Unavoidable due to the louvers and 90˚ bend 45˚ 35˚ 3.31m/s 2.55 m/s High Air Circulation Reduced Air Circulation John Kaiser S. Calautit

  9. School of Civil Engineering • Research Output: Publications • B R Hughes, J K Calautit, S A Ghani, The development of commercial wind towers for natural ventilation: A review, Applied Energy, 92, 606-627, 2012 • J K Calautit, B R Hughes, S A Ghani, A Numerical Investigation into the Feasibility of Integrating Green Building Technologies into Row Houses in the Middle East, Architectural Science Review, 55, 1-18, 2012. • Future Work: • CFD (Transient Modeling, UDF, Solar Loading, Dynamic Mesh) • Experimental Work (Wind Tunnel Design, Scaled-Model Testing) • Qatar Visit (Duct Testing and Full Scale Testing) John Kaiser S. Calautit

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