Evaluation of Energy Savings for Buildings with Green Roofs Having Different Vegetation
نویسندگان
چکیده
Thermal benefits of different green roof samples were analyzed and compared. Experimental data from ongoing green roof projects was used in a theoretical analysis of air-conditioning energy savings with different green roof applications. Thermal data was collected from a typical non-reflective (EPDM) roof membrane and model green roof systems with three types of growth media (lava, arkalyte, and hadite) matched with three sedum types (Sedum kamtchaticum, S. spurium, and S. sexangulare). Temperature readings underneath the growth media and from the non-reflective roof membrane were recorded for 32 months continuously. For the green roof systems, a complete thermal analysis model was achieved by combining the plant canopy and growth medium with heat flux continuity conditions through the surfaces and at the interface between the adjacent layers. The energy consumption comparisons were performed based on heat flux calculations, and the results demonstrated that the right combination of growth media and vegetation can yield significant energy savings for air-conditioning applications.
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