The Deep Lake Water Cooling System or DLWC is a

deep water source cooling Deep water source cooling (DWSC) or deep water air cooling is a form of air cooling for process and comfort space cooling which uses a large body of naturally cold water as a heat sink. It uses water at 4 to 10 degrees Celsius drawn from deep area ...

project in

Toronto Toronto ( ; or ) is the capital city of the Canadian province of Ontario. With a recorded population of 2,794,356 in 2021, it is the most populous city in Canada and the fourth most populous city in North America. The city is the ancho ...

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

. As a

renewable energy Renewable energy is energy that is collected from renewable resources that are naturally replenished on a human timescale. It includes sources such as sunlight, wind, the movement of water, and geothermal heat. Although most renewable energy ...

project, it involves running cold water from

Lake Ontario Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border sp ...

, to air-condition buildings located downtown Toronto. The DLWC was built by

Enwave Enwave Energy Corporation is a Canadian energy company headquartered in Toronto that provides sustainable district energy solutions including heating, cooling, hot water, combined heat and power, geoexchange, energy storage, sewer heat, waste- ...

, and opened August 17, 2004. Notable clients include

Toronto-Dominion Centre The Toronto-Dominion Centre, or TD Centre, is an office complex in the Financial District, Toronto, Financial District of downtown Toronto owned by Cadillac Fairview. It serves as the global headquarters for its anchor tenant, the Toronto-Dominio ...

Royal Bank Plaza Royal Bank Plaza is a skyscraper in Toronto, Ontario, Canada that serves as the "corporate headquarters" for the Royal Bank of Canada. The building shares with the Fairmont Royal York Hotel the block in Toronto's financial district bordered by ...

RBC Centre RBC Centre, also known as the RBC Dexia Building, is an office tower in Toronto, Ontario, Canada. Unlike the corporate offices of other Canadian financial institutions, the RBC Centre is outside of Toronto's Financial District. It has been owned ...

Metro Toronto Convention Centre Metro Toronto Convention Centre (originally and still colloquially Metro Convention Centre, and sometimes MTCC), is a convention complex located in Toronto, Ontario, Canada along Front Street (Toronto), Front Street West in the former Railway Land ...

and

Scotiabank Arena Scotiabank Arena ( French: ''Aréna Scotiabank)'', formerly known as Air Canada Centre (ACC), is a multi-purposed arena located on Bay Street in the South Core district of Downtown Toronto, Ontario, Canada. It is the home of the Toronto Rap ...

. Compared to traditional air-conditioning, Deep Lake Water Cooling reduces electricity use by 75%, and may eliminate 40,000 tonnes of carbon dioxide, the equivalent of taking 8,000 cars off the streets.

Development

Construction began in 1997, and received money from the

Federation of Canadian Municipalities The Federation of Canadian Municipalities (FCM, ''Fédération canadienne des municipalités'') is an advocacy group representing over 2000 Canadian municipalities. It is an organization with no formal power but significant ability to influence d ...

. It was officially launched on August 17, 2004, at

Steam Whistle Brewing Steam Whistle Brewing is an independent brewery in Toronto, Ontario, Canada. It was founded in 2000 by three former employees of Upper Canada Brewing Company after that company was bought out. The company celebrates Beer in Canada and produces onl ...

, one of Enwave's customers. The launch was attended by actor

Alec Baldwin Alexander Rae Baldwin III (born April 3, 1958) is an American actor, comedian, and producer. In his early career, Baldwin played both leading and supporting roles in a variety of films such as Tim Burton's ''Beetlejuice'' (1988), Mike Nichol ...

, Ontario Minister of Energy

Dwight Duncan Dwight Duncan (born 3 January 1959) is a former politician in Ontario, Canada. He was a Liberal member of the Legislative Assembly of Ontario from 1995 to 2013 who represented ridings of Windsor—Walkerville, Windsor—St. Clair and Windso ...

, Canadian Minister of Human Resources and Skills Development

Joe Volpe Giuseppe "Joe" Volpe (born September 21, 1947) is a Canadian politician. He represented the Ontario riding of Eglinton-Lawrence as a member of the Liberal Party in the House of Commons of Canada from 1988 until 2011, when he lost his seat t ...

, and Toronto Deputy Mayor

Sandra Bussin Sandra Bussin is a politician in Toronto, Ontario, Canada. She was a municipal councillor for Toronto City Council for Ward 32 in east Toronto from 1998 to 2010. From 2006 to 2010 she was Speaker of Toronto City Council. Background Bussin was bo ...

. The launch coincided with the anniversary of the 2003 blackout.

Mechanism

The DLWC involves three large pipes have been run 5 kilometres (3 miles) into Lake Ontario, to a depth of 83 metres. The water at that depth is a constant 4 °C (39 °F), its temperature protected by a layer of water above it, called a thermocline. The water is piped to a filtration plant and then to a heat-transfer station on the lakeside. Here the chill is “transferred” to another closed loop, consisting of smaller pipes that supply the towers of the city's financial district. Built at a cost of C$230m ($200m) over four years, the system is run by the Enwave Energy Corporation. Cold lake water is pumped through the source side of

heat exchangers A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contac ...

situated at Toronto's John Street Pumping Station while a

glycol A diol is a chemical compound containing two hydroxyl groups ( groups). An Aliphatic compound, aliphatic diol is also called a glycol. This pairing of functional groups is pervasive, and many subcategories have been identified. The most common ...

and water mixture is circulated through the load circuit of the heat exchanger, allowing for a net energy transfer from the water/glycol mixture to the lake water. The chiller glycol mixture is then circulated using pumps throughout fan-coil units installed in high-rise properties throughout the region served by Enwave in Downtown Toronto where is absorbs energy and repeats the cycle to provide cooling and dehumidification. This system is advantageous since it reduces, or even completely eradicates chiller usage during summer months and shoulder seasons, reducing energy usage, as well as minimizing the number of evaporative

cooling towers A cooling tower is a device that rejects waste heat to the atmosphere through the cooling of a coolant stream, usually a water stream to a lower temperature. Cooling towers may either use the evaporation of water to remove process heat and ...

from operating, which are susceptible to becoming breeding grounds for

Legionella pneumophila ''Legionella pneumophila'' is a thin, aerobic, pleomorphic, flagellated, non-spore-forming, Gram-negative bacterium of the genus ''Legionella''. ''L. pneumophila'' is the primary human pathogenic bacterium in this group and is the causative age ...

Development

Mechanism

See also

References