Effects of Living Walls in the Removal of Indoor CO2 and Energy Conservation in Office Buildings
CO2 is not only an indicator of indoor ventilation,but also a direct pollutant.To explore the effects of living walls in the removal of indoor CO2 and energy conservation in office buildings,this paper first conducted experiments to study the influence of plants'photosynthetic pathways,light intensity,and substrate moisture content,which can be adjusted in single office space,on CO2 removal rate of livings walls in comparison experiment rooms.Then,it analyzed mathematically the effects of living walls on fresh air load in a single-person office in Guangzhou.The results show that the plant's carbon assimilation pathways and substrate moisture content had no significant effects on the CO2 removal rate of living walls.However,the lack of water in the substrate would reduce the net photosynthetic efficiency of living walls.CAM plants can assimilate carbon dioxide to a certain extent under dark conditions,while hardly balancing the respiration of soil microorganisms.In single office spaces in Guangzhou,with the increase of 1 m2 of Epipremnum aureum living wall,the fresh air cooling load in summer and heat load of air conditioning in winter fall by 18.67 W and 8.77 W respectively under high light intensity.Under moderate light intensity,the fresh air cooling load in summer and air conditioning heat load in winter are reduced by 6.70 W and 3.15 W respectively.The E.aureum living wall per unit area can achieve a building energy saving rate of 3.6％～7.7％.Under high light intensity,13.0 m2 of E.aureum living walls are expected to replace the CO2 removal effect of a fresh air system in a single office space.
living wallsoffice buildingscarbon dioxide concentrationindoor air qualitybuilding energy conservation
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