New algae system cuts building's energy cost by absorbing indoor heat

Researchers at Murdoch University in Western Australia are developing microalgae-filled photobioreactors to integrate into buildings and urban structures, aiming to enhance energy efficiency and environmental health. These systems leverage microalgae's rapid carbon fixation and heat-absorbing properties to reduce indoor overheating, thereby lowering reliance on air conditioning and cutting energy costs. Western Australia's sunny climate is particularly suitable for cultivating microalgae, which can fix carbon dioxide at rates 10 to 50 times faster than terrestrial plants. A notable prototype, the Urban Algae Tree, mimics natural trees by providing shade, capturing rainwater, and operating on solar energy. This 1,500-liter system can scrub 1,000 kg of CO2 and release 700 kg of oxygen annually. The research is moving toward real-world applications, especially targeting rural mining accommodations ("dongas") where photobioreactors would offer passive cooling, air purification, and mental health benefits through nature-inspired design. Beyond remote sites, the technology could be