Análise da eficiência energética do sistema de condicionamento de ar com distribuição pelo piso em ambiente de escritório, na cidade de São Paulo, utilizando o modelo computacional Energyplus. / Energy efficiency analysis of underfloor air distribution (ufad) system for office rooms, at São Paulo city, using the ENERGYPLUS software.




The purpose of this research is to evaluate the energy performance of the Underfloor Air Distribution (UFAD) system at office buildings, considering different air loops design and economizer cycles while keeping thermal comfort for the weather data of São Paulo city, Brazil. Simulations were held using the EnergyPlus software version, since its numerical models can well represent UFAD systems and economizer cycles. One chamber representing an office room was used as reference for the simulation models. This chamber was developed by Leite (2003) to evaluate the thermal comfort conditions provided by the UFAD system. The curves of temperature distribution obtained from simulation were similar to those experimentally obtained by Leite (2003). Simulations were performed for two different air loops (with and without return air bypass) combined with three different outside air controls. The São Paulo weather data analysis demonstrates that the outside air flow can be increased with the use of economizer cycles, reducing electric energy consumption of the UFAD system. The results of this research indicate that there is a tight relationship between the system air loop design, economizer cycle control and weather data, which reveals that the combination between these parameters can reduce about 34,5% the electric energy consumption of UFAD system at São Paulo city.


economizer cycles sistemas de refrigeração e ar condicionado energy building simulation distribuição de ar pelo piso underfloor air distribution programa energyplus ventilating air conditiong (hvac) system heating simulação energética