This project is to develop the design of elements of construction for incorporation into a programme of low energy office buildings designed by Michael Hopkins & Partners. This is an extension of the existing Joule II Contract no. JOU2-CT92-0235.
The following deliverables will arise from the project:
1. Photovoltaic powered fan driven ventilation Assessment of the ability of PV cells mounted in a simple ventilated plane glazed cavity to produce electricity.
Three typical locations using actual climatic data will be studied; specifications of the PV mechanical layout and electrical layout will be produced.
2. Solar buoyancy driven ventilation Assessment of the value of these techniques in the design of active facade systems when considered as part of the design process. The model will be able to predict bulk airflows and temperatures within the facade and adjacent spaces due to the external climate.
3. Wind driven ventilation CFD run incorporating a numerical model of the physical wind tunnel test model. A comparison of the CFD and wind tunnel results will be undertaken. The evaluation of potential natural ventilation in terms of annual frequency of efficient flow ventilation; the quantification of the pressure suction generated by the wind towers and the flow rate in the chimmey will be done in association with visualisation techniques; rules of calculation, illustrations and examples, practice advice will be produced.
The project will address the following features:
1. Photovoltaic powered fan driven ventilation:
supply and extract fans serving air ducts running up the external wall run from electricity generated by photovoltaic cells placed on the roof of the building, or alternatively placed on a low-level canopy. The PV collectors could be combined with the air path of the exhaust ducts. 2. Solar buoyancy driven ventilation:
exhaust air shafts on the external wall are connected to ventilated window cavities and connect to rooftop heat recovery wheels within chimneys; the exhaust duct could be used as a hot air solar collector, using translucent insulation, increasing hot air buoyancy and the solar collecting surface area.
3. Wind driven ventilation: aerodynamic surfaces on exhaust chimneys catch wind and could provide forced ventilation when solar exposure is low in winter; the wind-driven ventilation chimney create negative pressure at the top of the exhaust flue, increasing exhaust airspeed.
Funding SchemeCSC - Cost-sharing contracts
95030 Catania, Piano D'arci
W1P 6BQ London