Thermal performance assessment of double hollow brick walls filled with hemp concrete insulation material through computational fluid dynamics analysis and dynamic thermal simulations

•Hemp filled bricks effective thermal conductivity determined equal to 0.28 W/m K.•Moroccan thermal regulation is respected only by 12 and 16-holed hemp filled bricks.•Annual heating and cooling loads are reduced from 73.92 to 27.19 kWh/m2 year.•Hemp filled bricks insulation technique led to a cost saving of 73.80 $/m2.•Annual GHG emissions are mitigated by a percentage of 74.39%.