According to the International Energy Agency in 2006 nearly 36% of the total world energy was consumed by buildings and urbanization. This paper dimensions the effect of passive design corrections on the envelope of a new corporate office building in the temperate climate of Mexico City’s central area. It confirms that these are the most cost effective measures to reduce HVAC peak load, minimize system size and improve performance. It used thermal analysis to evaluate the impact of three corrective strategies: low E double glassing, adjusting shading coefficient (SC) and insulation of walls and ceiling. Results show that if low E double glassed windows are installed, heating requirements are cut by half, while peak cooling load is reduced one fifth. A 50% Shading Coefficient (SC) has also a significant effect, reducing peak cooling load in May an additional 26%.

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