Passive cooling techniques for ventilation: an updated review Dhafer Al-Shamkhee, Anwer Basim Al-Aasam, Ali H.A. Al-Waeli, Ghaith Yahay Abusaibaa and Hazim Moria Renew. Energy Environ. Sustain., 7 (2022) 23 Published online: 02 August 2022 DOI: 10.1051/rees/2022011