Heat-seeking sewer model

Description:Heat-seeking sewer model. Presenter: Yuko Suda, P.Eng., Kerr Wood Leidal Associates Ltd. Additional Contributors: Genevieve Tokgoz, P.Eng., Metro Vancouver, Burnaby, BC. A significant amount of renewable heat flows through Metro Vancouver’s sanitary sewers each day as warm sewage. This excess energy can be recovered and used to heat buildings and is an economical means of displacing natural gas and reducing greenhouse gas emissions. The increasing interest in recovering sewage heat for space heating and cooling led to a study to determine the viability and implications of implementing sewage heat recover projects in Metro Vancouver. A key concern for sewage heat recover projects was how much heat can safely be recovered without endangering sewage treatment processes, both now in the future. In order to address this concern, the Heat-Seeking Sewer Model was developed. The Model calculates the sewage flow rate and associated sewage temperature at nodes within the sanitary sewer network. The sewage heat capacity throughout the system is calculated by tracking the flows and temperatures of each sewage component (base sanitary flow, inflow, and infiltration) separately. The model can be adjusted to account for seasonal variations of each variable, population growth, and water/energy conservation measures. The Model results show that there is plenty of heat in the sewer system to heat homes. Up to 100 MW of recoverable heat is available across the region, enough to heat about 650 to 1,000 high-rise buildings. Although this Model was applied to Metro Vancouver, it can be deployed in any sewer collection system, enabling widespread implementation of sewage heat recovery projects and effective management of the underlying sewage systems.

Authors: Yuko Suda

Subjects: Energy and Climate Change

Tags:2015 Annual Conference,AC15,2015 BCWWA Annual Conference & Trade Show

Citation:Stream 3: Resource Recovery

Publication Date:May 28th, 2015 Upload Date:Jun 25th, 2015

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