Distribution Piping System. The DPS routing and sizing for the base case long term servicing plan is show in Drawing G05 in Appendix One. 4 FINANCIAL MODELLING GENERAL ASSUMPTIONS The project plan outlines the full build-out of the UBC NDES project, all relevant capital costs, operating costs, and other facts and assumptions for the full 30-year project term. There are a number of assumptions regarding future prices and rates that have a global bearing on the results of the financial model. Table 5 below shows the commodity price and other cost escalation rates used in the model. Table 5: Escalation: Facts and Assumptions ESCALATION (NOMINAL) Base year 2014 Forecast CPI (for O&M) 2.0% Capital costs 2.0% Natural gas Xxxxxxx Electricity (2014 to 2023) Hydro Electricity (2024 onwards) 2.0% Heat purchased from ADES Xxxxxxx Waste heat from TRIUMF 0.0% Further information regarding the items in Table 5 above: • The base year for the model is 2014, although construction is not expected to commence until early 2015. The model also indicates a project year, with 2014 being year 0. No adjustment to the NPV calculations has been made for the short initial year because the costs incurred are proportionately small and no customer connections are made until the second quarter of 2015. • Operating costs (non-fuel) and capital costs have been escalated at 2% per annum as an estimate of inflation. A sensitivity comparison for +/– 1% on this amount has been prepared and is shown in Section 2.10.3. • The commodity cost of natural gas is assumed to escalate in proportion to the Xxxxxxx forecast for domestic natural gas at Huntington/Sumas. The commodity forecast used is as of June 30, 2014, and after two years of mild decline, followed by two years of increase moderately in excess of CPI, the forecast assumes 1.5% per annum escalation until 2024, which is the limit of the Xxxxxxx forecast. Thereafter, the financial model assumes that commodity cost of natural gas will escalate at 2% per annum, in line with the estimated CPI. Gas delivery and demand charges are assumed to escalate at CPI. • The cost of electricity is assumed to escalate according to BC Hydro’s most recent 10 year rate plan. The escalation factor used is moderately in excess of CPI until 2018, and thereafter is assumed to be 2% per annum, in line with the estimated CPI.
Distribution Piping System. Class C KWL has extensive experience with the design and installation of pre-insulated piping for hot water district energy systems in the Lower Mainland, particularly at UBC. The per-linear-meter cost factors for individual pipe diameters are based on actual installed costs of DPS in the Lower Mainland. The quantities and sizing of pipe in the cost estimate are based on the DPS layout shown in drawing G-002, which was developed using a WaterCAD model to optimize the pipe sizing and the pipe lengths were determined using GIS. DPS alignments and locations have not been finalized. General routing has been identified, however major utility conflicts have not been identified or included in the cost estimates. DPS service connection allowances are included for all building and energy centre connections. General conditions were estimated at 7% of capital cost, engineering at 15%, and a contingency of 20% of capital has been added.
Distribution Piping System. District heating piping to be prefabricated, pre-insulated steel piping system meeting EN253 or prefabricated, pre- insulated flexible piping system meeting EN15632. District cooling piping to be welded standard schedule steel with epoxy coating or HDPE, with no insulation. Piping shall meet system design temperature and pressure. District heating and cooling piping to be designed to ASME B31.1 Power Piping Code and meet piping manufacturer design and installation requirements. Energy Transfer Stations Energy transfer stations shall use a single brazed plate or plate and frame heat exchanger to isolate the district energy system from each building system, i.e. one for space heating, one for domestic hot water (DHW), and one for space cooling. DHW heat exchangers shall be double-wall gasketed plate and frame. Direct connection of district cooling system may be considered. Each energy transfer station shall include a commercial grade control system consisting of thermal energy metering systems meeting EN1434, two-way control valves to modulate flow through each heat exchanger, and temperature and pressure sensors. The control system will control the building supply temperature based on an agreed reset schedule. Central Energy Plant The central heating energy plant will employ sewer heat recovery as the base load energy source, consisting of heat pumps to provide the temperature lift and a sewage treatment and filtration system to meet heat pump requirements. Natural gas boilers will be used in series to the sewer heat recovery system to provide peaking and backup capability. The central heating plant will be sized to meet peak demand, with the sewer heat recovery system being sized to meet the base load, and natural gas boilers sized for full plant capacity with “N-1 redundancy” (i.e. can serve approximately 75% of peak demand with largest single production unit unavailable). The central cooling plant will employ chillers and cooling towers to serve the cooling load, with high efficiency chillers to serve the base load and standard efficiency chillers to provide peaking capability. The central cooling plant will be sized to meet the peak demand, with no redundancy or backup. Chilled water storage utilizing an existing tank on site may be employed. Regards, Xxxxx Xxxxx, P.Eng. FVB Energy Inc. ~ END ~ SCHEDULE E DESIGN COMPATIBILITY GUIDELINES FOR CONNECTION TO DISTRICT ENERGY Page 33 of 35 District Energy Utility Design Compatibility Guidelines for Connection...
Distribution Piping System. Thermal energy is delivered to customers with a closed loop four-pipe hot water distribution network. The same water is heated in the CEP, distributed to the buildings, transferred at the ETS and returned back to the CEP to be reheated and distributed again. No water is drained or lost in the system, and no additional water is required during normal operation.
