Volume 3 - Program & Project Ideas (PDF - 4.5 - Natural Life Network

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<strong>Natural</strong> Resources Canada – Community Energy Systems - Case study: Halifax, NS The two towers of Purdy’s Wharf in Halifax utilize cold water directly from the harbour to provide cooling for their tenants. The water is pumped from the harbour floor, filtered and then passed through two plate and frame heat exchangers (see photograph), where the water absorbs heat from the building’s internal cooling system. The system works so well that traditional electrical chillers are only required for a small period of time in the shoulder seasons. - Purdy’s Wharf: (Above): Water from the harbour floor, is filtered and passed through two plate and frame heat exchangers (black units in photo) where the water is heated by the building’s cooling water system. (Below) The two towers at Purdy’s Wharf in Halifax are the first buildings in North America to be cooled by seawater as a primary source of cooling. For additional information, contact Bill MacNeil tel.: (902) 421-1122. - Case Study: Ottawa, ON The Cliff Street Heating and Cooling Plant is part of the network of district heating and cooling systems owned and operated by Public Works and Government Services Canada to provide heating and cooling to federally- and privately-owned buildings. The Cliff Street system, located in Ottawa near the Parliament buildings, provides up to 96MWt of Draft 4/11/2005 114
<strong>Natural</strong> Resources Canada – Community Energy Systems thermal heating and up to 29,000 tons of chilling. The chilling is provided by a combination of electrical chilling units, absorption chillers using low pressure steam from the boilers and, during the shoulder season, free cooling provided directly by water from the Ottawa River. The mix of chilling equipment enables the plant to optimize its performance, and has become one of the most cost effective sources of cooling in Ottawa. For additional information, contact Dan Derousie, Director, Operational Support Services, PWGSC. Tel.: (819) 775 4040. A.4 Waste heat recovery The use of heat recovered from an industrial process to displace the use of fossil fuel within the community or industrial park. - Case Study: Burnaby, BC The solid waste incinerator, operated by Montenay Inc. for the Greater Vancouver Regional District (GVRD) in Burnaby, has for many years provided medium-pressure steam for local industries. The plant has since been modified to allow the boilers to produce high-pressure steam that is then passed through a turbine to generate electricity. Medium-pressure steam, suitable for the needs of the local industries, is extracted from the steam turbine. The green electricity is used locally within the GVRD. For additional information, contact Ron Richter, Monteany Inc. Tel.: (604) 521 1025 - Case study: City of Vancouver and the Corporation of Delta, BC A landfill gas collection and flare system and co-generation plant at the Burns Bogg landfill was developed in partnership with Maxim Power Corporation to produce electricity for local greenhouses and reduce greenhouse gas emissions. Source: This case study will be highlighted in a document to be issued by the Federation of Canadian Municipalities. For information, contact the office at 24 Clarence Street, Ottawa, Ontario K1N 5P3, Tel: (613) 241-5221 ext. 245, fax: (613) 241-7440 A.5 Bioenergy The use of biological matter (wood, landfill gas, biosolids, combustible refuse) can provide a regular supply of inexpensive fuel for thermal or electrical power generation. Bioenergy, like fossil fuels, can produce CO2. However, the net emission of CO2 from bioenergy will be zero as long as plants are replenished. Draft 4/11/2005 115
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