Project Green District Energy Feasibility Study - Partners in Project ...

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TRCA Pearson Eco-Business Zone District Energy Feasibility Study 10 April 2012 Design Parameters MTHW Pipe Velocities: Buried Mains & Mains in Tunnels Max. Water Velocity in Service Lines Temperatures: Max. Supply Temp. Min. Supply Temp. (Off Peak) Max. Return Temp. Min. Return Temp. 19 2 – 5 m/sec 3 m/sec 120°C 75°C 75°C 45°C System Design Pressure 1600 kPa System Test Pressure 1.5 x Design Pressure Minimum Trench Slope for Drainage 0.5% Table 5 DPS Design Criteria 4.2.2 Material The DPS shall be installed as a fully welded and bonded system in which the steel carrier pipe, insulation and outer casing are bonded together to form a solid unit. This solid unit when buried is completely sealed from soil and water ingress and hence provides superior longevity and performance. It is critical for reliability that owners procure from suppliers of complete buried systems rather than attempting to assemble components from multiple suppliers to provide a completely sealed system. The system consists of a steel carrier pipe, polyurethane foam insulation with integral copper leak detection alarm wires, and an outer casing of high density polyethylene. The system shall be designed such that the expansion movements of the steel carrier pipe are transferred to the outer casing via the foam insulation. The elements of the bonded pipes shall be manufactured to expand and move together. The movements are restricted by the friction between soil and jacket pipe, which acts as the anchorage for the pipe system. Generally external anchors are not required. Expansion is allowed for, as determined by the stress analysis. 4.2.3 Vents and Valves In the majority of cases direct buried valves and vents will be installed in the heating distribution system. These will be operated through risers and valve boxes set at street level. Valve chambers will be designed and installed as necessary at strategic locations to house the larger isolation valves. Drains and vents will be installed either at the valve chambers or at separate purpose built chambers as necessary within streets and sidewalks. The vaulted chambers may be constructed in place using reinforced precast concrete units or high density polymer concrete. All manholes will have person access for operation, maintenance and repair.
TRCA Pearson Eco-Business Zone District Energy Feasibility Study 10 April 2012 4.2.4 Trench Details Open trench width is dependent on the pipe size, but for a common size of 150 mm (Nominal Pipe Size 6”) heating carrier pipes, the trench width will be a maximum of approximately 1,280 mm (50”). Trench cutbacks in unpaved areas are based on a 1:1 slope for depths greater than 1.0 metre, or as required by local regulations or procedures. Native soils, if suitable, will be returned and compacted in the trench to complete filling up to the underside of the roadbed. Trench construction and all work within the streets will conform to City and/or Regional requirements. Generally, all reinstatement is to an “as was” condition and/or to meet adjacent conditions. 4.2.5 Communication Cable System The Communication Cable System will provide the communication link between each building and the Energy Centre. This will allow remote supervision; control and metering of each ETS, as well as Variable Frequency Drive (VFD) pump control via ∆P sensors at the furthest points in the distribution system. 4.2.6 Leak Detection System The leak detection system detects moisture in the insulation based on a change in conductivity of the insulation. Two non-insulated wires are supplied in each component’s polyurethane insulation of the prefabricated piping system. Each component wire is connected and the system is linked to a central monitoring device. The results discussed in Section 2: Customer Demand have been used to prepare a conceptual design of the DPS. We cannot presume that the GTAA CUP will be a supplementary energy source, but it is a good candidate and centrally located with respect to the customers. Fortunately there is vacant land on the east side of Elmbank Road, i.e. in between the CUP and prospective customers #’s 1, 2 and 3, just across the street from the CUP, which has been designated by Partners in Project Green for the Energy Centre. The intent would be to construct a new Energy Centre on this site that might be eventually connected to the CUP, with consequent improvement in reliability for both. If there was any district cooling component, which at this time seems unlikely, possibly limited to only the Airway Centre, the recommended distribution medium for commercial district cooling systems is chilled water supplied at temperatures ranging from 4 to 8 °C (re-set according to outside air temperature) and controlled to achieve a return temperature of 14 °C. This temperature profile is compatible with standard building HVAC systems. The ΔT of 10 °C on peak reduces piping and equipment sizing. Until confirmed through specific commitments with the Airway Centre, it will be assumed that there will be no cooling component to the project in the foreseeable future. 4.3 Energy Transfer Stations The DPS would deliver hot water and chilled water to the ETS located in the basements of each customer building. The ETS, although located in the customer building, would be owned and operated by the DES. The components of an ETS include: Separate heat exchangers (HX’s) for domestic hot water (DHW) and space heating Primary piping to connect the HX’s to the branch lines of the DPS 20
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Project: Pearson Eco Business Zone
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