Night cooling energy storage

What is night cooling?

In many climates and buildings types this can be done during the night using natural or mechanical ventilation to cool the thermal mass at night so that they can absorb heat during the day, thus requiring less energy for conditioning the air. This strategy has been termed ‘night cooling’ sometimes also called ‘night purging’.

Can night ventilation save energy?

A review of control systems, and supplementary cooling coupled with night ventilation. The rising costs of energy usage in the building sector have intensified research interest in passive energy saving strategies such as night ventilation (NV).

Is night ventilation a good cooling strategy?

Night ventilation is regarded as a promising cooling strategy by storing night cooling in the thermal mass of the building. However, night ventilation performance in hot summer is restricted by the climatic limits.

How does reducing daytime cooling load affect a building's ventilation potential?

3.2. Cooling load parameters and reducing daytime cooling loads The night ventilation potential is significantly improved by the increased cooling energy demand of the building as the increased cooling demand created at night results in more available energy stored in the building during the day.

Does night cooling reduce daytime cooling demand?

Mechanical cooling (air-conditioning and fan-forced ventilation) In many studies, the use of night ventilation reduced the daytime cooling demand of air-conditioners. Geros et al. found that night cooling created an average reduction of 3.0 °C when night air-conditioning was used (or 0.2 °C when passive ventilation was used).

Does night ventilation reduce peak cooling demand?

In warm climates peak cooling demand reduction of 13% can be achieved. For residential buildings, in tropical climates (Malaysia) it was reported that night ventilation reduces the peak indoor air temperature by 2.5 ℃ and nocturnal air temperature by 2.0 ℃ on average.