Abstract：The proposed project is located in Tianjin, subject to cold winters and hot summers.  The site area is approximately 60,000 m2, with Phase one occupying 6,000m2.  The GFA for Phase one is approximately 20,000 to 23,000 m2.  The existing conceptual scheme includes provision of passive ventilation and stack effect.  The design concept for the Tianjin Technology Park is to respond to the microclimate and the outcome will be an energy efficient development which brings users closer to the natural environment.  The Tianjin Technology Park intends to be a low energy building utilising natural / passive ventilation, solar shading and diffused north light. Sixteen cases were tested by Computational fluid dynamics (CFD) for no wind and three wind directions with a combination of geometrical arrangements including the number and size of skylights and atria.  The annual energy consumptions were determined by dynamic thermal modelling.  The current paper presents a case study demonstrating the energy savings in terms of heating and cooling loads offered by the natural / passive ventilation modes compared to a fully air conditioned mode.

Keywords: natural ventilation, free cooling, energy saving