Sizing natural ventilation systems for cooling: The potential of NV systems to deliver thermal comfort while reducing energy demands of multi-storey residential buildings in India.
2018
This paper aims to identify the potential of natural ventilation for cooling a representative twobedroom residential apartment layout in India. India faces an unprecedented demand for residences and must
reduce energy consumption associated with air-conditioning. Three significant climates and cities in India are
investigated in this paper. The potential to extend the hours of the year for which thermal comfort is achievable
using natural ventilation strategies is tested. This potential is identified by employing analytical methods to design
and size ventilation capacity. Five natural ventilation design strategies are used over several scenarios varying
window free area and ceiling fan speed. Indoor temperature setpoints are based on the India Model for Adaptive
Comfort. Results are given as percentage of hours of the year for which natural ventilation is capable to remove
calculated heat gains. Percentages of hours are divided into day-time and night-time. Findings show that the
combination of large windows or balcony doors with additional ventilation openings and ceiling fan increases the
total percentages of hours of the year for which natural ventilation is effective impacting on substantial energy
consumption reduction with air-conditioning. Conversely, this potential varies with climate, and hence location.
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