Vertical indoor greenings as a support for improving indoor climate in low-energy buildings
The study tested whether vertical indoor greenings (VIG) improve the room climate with focus on humidity in low energy-buildings. For the first screening, six different VIG systems were tested concerning their ability for water release under controlled conditions in a greenhouse. The amount of water that was released as vapor (evapotranspiration) by each VIG system was calculated from the loss of weight. Room climate was monitored continuously and correlated to the water release. The amount of water release varied between 25 and 56 g m-2 h-1. Systems 5 and 6 provided the highest evapotranspiration combined with the best water supply for the plantings. All VIG showed a trend of a self-regulatory effect related to air humidity. In the second part of the study the VIG system 6 was implemented into three offices (two of 17 m2, one of 33 m2) of a low-energy building with uncomfortable room climate. Again, the level of water release from VIG strongly correlated with the air humidity of the room. Thus, water release was high at low humidity and vice versa, indicating a self-regulatory effect. On average water release per planted area for VIG 6 was 50 g m-2 h-1 in offices and greenhouses. In small offices, in with closed door and windows most of the time, relative humidity increased by 20% compared to the control room (door open). With open doors air humidity was 14 and 8% higher in the small and the large office, respectively compared to the control rooms (door open).
Bucher, A. and Kohlrausch, F. (2017). Vertical indoor greenings as a support for improving indoor climate in low-energy buildings. Acta Hortic. 1189, 247-250
relative humidity, evapotranspiration, living walls, green walls, office