Evaluation of Design Strategies for Improving Summer Comfort Conditions in a Low-Energy Residential Building

The aim of the present study is to evaluate the design strategies for improving the summer thermal comfort conditions in a low-energy residential building located near Rome. The evaluated strategies include the natural air-flows through the windows: a) opening of windows for 24 hours and b) opening of windows during night hours only. The evaluations have been carried out by means of simulations using EnergyPlus building energy simulation programme. Results have shown that the comfort level can be improved substantially by adopting the intelligent strategies in the use of windows (close during the day in the warmer days and always open during the night); moreover, the limited use of ceiling fans (mechanical ventilation) results only few hours of condition of discomfort. Further the evaluations have also been made regarding the use of ground source cold water through a heat pump and radiant floor system for ensuring the comfort in all the days, also the hot one, without the requirement of air-conditioning system.