Enwave Energy Corporation, through partial financial backing from the City of Toronto as one of the two shareholders of Enwave, developed the Deep Lake Water Cooling system that uses the cool energy in cold water to air-condition high-rise buildings in downtown Toronto. The system benefits the City by:
- reducing energy consumption by up to 90 per cent (compared to conventional chillers)
- reducing carbon dioxide emissions
- improving the water supply by using new intake pipes that are deeper
- investing in a corporation in which the City is a shareholder
How the system works
Enwave’s three intake pipes draw water (4 degrees Celsius) from 5 kilometres off the shore of Lake Ontario at a depth of 83 metres below the surface. Naturally cold water makes its way to the City’s John Street Pumping Station. There, heat exchangers facilitate the energy transfer between the icy cold lake water and the Enwave closed chilled water supply loop.
The water drawn from the lake continues on its regular route through the John Street Pumping Station for normal distribution into the City water supply. Enwave uses only the coldness from the lake water, not the actual water, to provide the alternative to conventional air-conditioning.