This research incorporates two passive technologies selected to offer thermal comfort
conditions in a room exposed to extreme desert climatic conditions (Hermosillo, Sonora,
Mexico). On the one hand, a rectangular earth-air heat exchanger assisted with PCM
(REAHE+ PCM) is implemented. Its job is to supply cooled air to the room at temperatures
below the comfort temperature. On the other hand, a room with PCM on its ceiling (room+
PCM) is proposed, to reduce the thermal load towards the room and shift the thermal peak …

This paper reports a detailed transient study of a room's airflow and thermal behavior with a
phase change material (PCM) in the roof, coupled with a rectangular earth-air heat
exchanger assisted with PCM (EAHE-PCM) in a city with a desert climate. The effect of
position, thickness, latent heat, and phase change temperature of the PCM in the room was
investigated. Also, the different room configurations reported the time evolution of heat
fluxes, temperatures, coefficient of performance (COP), and the liquid fraction. A comparison …