The impact of phase change materials assisted night purge ventilation on the indoor thermal conditions of office buildings in hot-arid climates

Abstract

14Night purge ventilation is an effective technique for passive cooling, which is typically used 15 in office buildings with the aim of reducing the daytime temperature, and thereby reducing 16 the cooling load of HVAC systems. This method uses the cool of the night to release the 17 warmth stored in the thermal mass during the day. That is, this system optimizes the energy 18 storage properties of thermal masses to provide thermal comfort in interior spaces. The 19 purpose of this study is to determine the impact of the use of night purge ventilation in 20 conjunction with PCMs on the indoor thermal conditions of a typical office building located 21 in hot-arid climates. In this article, the impacts of optimal night ventilation on the heat 22 flushing operation, inside room temperature and element thermal conditions are all evaluated. 23It was found that combining PCMs with night ventilation will significantly improve indoor 24 thermal conditions; however, results vary for different days in general and different structural 25 elements in particular. Moreover, the application of PCMs can reduce night ventilation 26 system problem of occupants feeling cold in the morning, whereas in the majority of work 27 hours the temperature of inside element faces is approximately 0.5°C lower than the room 28 temperature, both of which improve thermal comfort. 29 30 31 Keywords 32 Night ventilation, Phase change materials, Office buildings, Hot-arid climates, Indoor thermal conditions 33 34 35 36

Uso de PCM para edificações em região de clima quente

“…Quanto a ventilação noturna, Nazi et al (2017) determinou que seu uso possuiu melhor desempenho quando associado a PCMs nas paredes externas. A ventilação noturna também é valorizada por Solgi et al (2017Solgi et al ( , 2019a como uma técnica produtiva de resfriamento passivo que demonstra um alto potencial de redução de cargas de resfriamento.…”

Energy Saving through Connection of Sunken Garden with Nature and Passive Cooling in Traditional Buildings of Hot and Dry Climate of Iran

“…In the night ventilation thermal materials are used to absorb daytime heat and to discharge this stored heat through ventilation and cooling at night [7]. It is directly related to thermal mass characteristics used in the walls of the buildings and the surface of the openings [7,9].…”

A literature review of night ventilation strategies in buildings

“…Al-Ain city, United Arab Emirates (BWh) Low-Rise heavy residential buildings Improving NV with a combined wallroof solar chimney [31,32] A full-scale model (EnergyPlus) derived form an experimental model in Arizona [33] Yazd, Iran (BWh) A typical office building with lightweight structure Combined use of PCMs to optimise NV [17] Simulations of EnergyPlus and the flow solver of Design Builder Nicosia, Cyprus (BSh) Vernacular buildings…”

“…Solgi et al [31,32] combined PCMs and NV in office buildings of a hot-arid climate, resulting in a 45.5% reduction of the annual cooling load. It illustrated that the application of PCMs throughout the whole building contributed to reducing the cooling load, except for ground floors, where the addition of PCMs resulted in an increase of the cooling load.…”