Buildings take a great share on the total energy consumption and CO2 emissions in Portugal. Poorly thought buildings pollute the urban space, and contribute to the increasing buildings sector energy demand. When thinking in retrofitting old buildings, the common thought is that huge amounts of money must be spent on it. This paper, presents a case study on a poorly energy performing commercial building, where a hybrid ventilation free-cooling technique is used to demonstrate its potentiality to efficiently decrease building energy consumption, without requiring huge investments. The original building configuration, without free-cooling, originates high inside temperatures throughout the year. The energy needed for space cooling represents 48% of total building annual consumption.Generally, results show that hybrid ventilation free-cooling, using the cold mountain air at nighttime has a great potential for reducing energy consumption, of the order of 10% of total building climatization energy demand. Sensitivity analysis provided parametric knowledge about the performance of the technique when applied to this building under different conditions. A reduction of 142 tCCVyear, in the total building Carbon emission is estimated.
展开▼
