Elderly Care Facilities
Sustainability audits performed at a number of elderly care facilities have provided valuable insights. At Susan Strijdom home for the elderly in Pretoria the annual energy usage in 2016 was more than 313,000 kWh. The kitchen was the largest single user of electricity, followed by water heating and the laundry. Monthly municipal water consumption was typically in excess of 800kl with about 25% of the water supply used for bathing and the laundry and up to 35% used for the garden. However more than 35% was flushed down the drain by toilets and leaking infrastructure while only about 5% of the water was used for drinking and in the kitchen. The municipal electrical smart meter billing was accurate initially however since the smart meters were removed in 2019 billing is manipulated by the municipality frequently using estimated consumption and over-charging.
A 10-year Service Agreement was signed in 2017 for a GreenTower Microgrid at SAVF Susan Strijdom home for the elderly. The aim was to validate the performance of the GreenTower Microgrids and demonstrate its capacity to support a sustainable business model for energy and water security as a service.
Baseline maximum demand peaked in June 2017 at 130.9 kVA which was reduced to 79.3 kVA in June 2019, a 51.6 kVA (40%) saving, with energy usage for June reduced by 5,987 kWh (18%), while saving ±2.2 million litres of municipal water by using treated borehole water for hot water supply and irrigation. GreenTower is currently on track to pass on net savings of around R1million over a decade while enhancing energy and water security at Susan Strijdom home.
In 2019 the GreenTower Microgrid at Susan Strijdom home was expanded to improve food security with an aquaponics greenhouse with fish and vegetable production. In August 2019 Coventry University (UK) completed performance validation of the GreenTower Microgrid circular economy model.
During 2020, in response to covid-19, GreenTower technology will also provide health security to elderly care facilities by providing ozone treated water for disinfection of surfaces and groceries along with 3D printed face masks for care givers.