DELGANY INTERCEPTOR AND SOUTH PLATTE RIVER STUDY

Transcription

1 DELGANY INTERCEPTOR AND SOUTH PLATTE RIVER STUDY ALTERNATIVES ANALYSIS APPENDICES A C Prepared for City and County of Denver Department of Public Works June 28, South Quebec Street Greenwood Village, CO Project

2 Appendix A Historic Maps And Property Agreements

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23 Appendix B Hydraulic Analysis Existing Delgany Interceptor

24 By: Brock Hodgson Date: 2/15/17 APPENDIX B Hydraulic Analysis Existing Delgany Interceptor Project Description: The purpose of this hydraulic analysis is to evaluate the existing hydraulic capacity of the Delgany Interceptor and to consider alternative alignments for relocating the Delgany Interceptor. The Delgany interceptor is a parallel 78 and 72 interceptor along the South Platte River with a portion of the interceptor above grade prior to a siphon river crossing under the river. There is interest in improving the river access along the South Platte River in conjunction with revitalization efforts associated with the National Western Stock Show complex. The existing above grade portion of the interceptor prevents river access and therefore considerations would like to be made on potential options for relocating and/or improving the access in this area. Plan View:

25 By: Brock Hodgson Date: 2/15/17 Hydraulic Analysis: The existing hydraulic capacity was evaluated to establish the current capabilities of the interceptor. The interceptor includes a siphon under the South Platte River that remains flooded during operations and connects downstream to a 90 interceptor with the ability to divert flows to a parallel 78 interceptor. Given the existing arrangement the current capacity is not limited by the siphon or downstream interceptors. Upstream of the siphon there have been some repairs to the Delgany interceptor. As a result of these repairs or during initial construction there are sections of pipe with no or inverted slope that will compromise the hydraulic capacity of the exiting interceptor. This arrangement indicates that at peak flow there will be sections of pipe that will full-flow along the interceptor upstream of the siphon. To quantify the existing capacity for the individual parallel interceptors, the interceptor just upstream of the siphon was evaluated with the criteria of a reasonable d/d must be maintained. Given the d/d constraint the resulting combined capacity for both interceptors is MGD (Table 1). This design capacity assumes that under dry weather flows a d/d <0.8 should be maintained, however given the flat and inverse slopes previously discussed there will still be pipes that full-flow at this capacity, however surcharge above the pipe will be overall minimal. The pipe profiles under the evaluated capacity are provided in Profile 1 and Profile 2. Table 1. Existing Hydraulic Capacity Diameter ID Slope d/d Peak Q, MGD % % TOTAL Profile 3 indicates the HGL at the siphon under the flow conditions identified above. The siphon includes two parallel 66 lines that connect downstream into a single 90 interceptor. As previously discussed the siphon will always full flow, but the downstream 90 interceptor has sufficient capacity and does not limit the capacity of the Delgany interceptor. While the 90 interceptor does not limit the existing operations, the elevations downstream of the siphon will be an important consideration for any modifications to the upstream siphon locations.

26 By: Brock Hodgson Date: 2/15/17 Profile 1

27 By: Brock Hodgson Date: 2/15/17 Profile 2

28 By: Brock Hodgson Date: 2/15/17 Profile 3

29 Title: Delgany Interceptor Realignment Date: 2/20/2017 SUMMARY Value Assumption Upstream Tie-In Elevation Tie-In both interceptors at location of MH Siphon Tie-In Elevation 5138 Estimate of elevation necessary to ensure siphon flow Available Fall 6.49 AECOM Length (ft) Slope (%) Replace with 2-60" Replace with 2-66" Replace with 2-72" Total Flow (MGD) Total Flow (MGD) Total Flow (MGD) Option % Option % Option % Option % CALCULATION Pipe Wetted Diameter, in Slope, ft/ft Mannings n d/d Radius, ft Depth, ft Depth, in b O b, rad Area, ft 2 Perimeter, ft Hydraulic Radius, ft Velocity, ft/sec Flow, cfs Flow, mgd Option Option Option Option Pipe Wetted Diameter, in Slope, ft/ft Mannings n d/d Radius, ft Depth, ft Depth, in b O b, rad Area, ft 2 Perimeter, ft Hydraulic Radius, ft Velocity, ft/sec Flow, cfs Flow, mgd Option Option Option Option Pipe Wetted Diameter, in Slope, ft/ft Mannings n d/d Radius, ft Depth, ft Depth, in b O b, rad Area, ft 2 Perimeter, ft Hydraulic Radius, ft Velocity, ft/sec Flow, cfs Flow, mgd Option Option Option Option

30 Appendix C Sewer Heat Recovery Case Studies

31 CASE STUDY SOUTHEAST FALSE CREEK NEIGHBOURHOOD ENERGY UTILITY Vancouver, British Columbia Tecsir Heat Pumps in the Southeast False Creek Neighbourhood Energy Utility (source: vancouver.ca) Type: Sidestream Sewage Heat Recovery Technology: - 2 x SHARC 880SS Wastewater Solids Filters - 2 x Tecsir Sewage Heat Recovery Units Heat Source: Raw sewage Commissioned: 2010 Cost: $30M USD Capacity: 3 MW COP 1 : 3.5 T: 5 C Service: 395,000 m 2 (4,300,000 ft 2 ) of residential, commercial, and institutional space The Southeast False Creek Neighbourhood Energy Utility (NEU) is the first district energy system in North America to use untreated municipal wastewater as the primary heat source. The NEU is able to supply approximately 70% of the energy demand (heating and domestic hot water) for the False Creek area, with the remaining energy demand supplied by natural gas boilers. Untreated wastewater is screened and pumped from the local sewer to the heat recovery unit at a rate of approximately 1,900 GPM. Within the heat recovery unit, thermal energy in the screened wastewater is transferred to the NEU distribution system pipes. Cooled sewage and screened solids are sent to an adjacent sewage pump station and pumped to the Iona Island Wastewater Treatment Plant. 1 Coefficient of Performance: the ratio of the energy transferred for heating to the input electric energy used in the process. Higher COPs equate to lower operating costs.

32 CASE STUDY SANDVIKA FJERNVARME Oslo, Norway Sandvika Fjernvarme (source: friotherm.com) Type: Sidestream Sewage Heat Recovery Technology: - 2 x Friotherm Unitop 28C heat pump units Heat Source: Raw sewage Commissioned: 1989 Cost 3 : $33M USD Capacity: 14 MW total heating COP: 3.0 Service: 300,000 m 2 (3,230,000 ft 2 ) of residential and commercial space A new urban centre in Sandvika, a suburb of the Norwegian capital Oslo, was built in the 1980s with direction from the local parliament to provide a district heating system for the entire area. The source of the energy for the system is one of the largest wastewater channels of Norway, with an average flowrate of 3,000 L/s (40,000 gpm). It was determined that a submerged (inline) SHR system would be impractical due to the capacity required; therefore, two heat pump units were selected to extract the energy. Wastewater is pumped from the channel and cleaned using a two-step process (screening and sedimentation) before passing through the heat pump units. The district heating network supplies heating to 56 buildings, with a total network length of 10 km (6.2 mi), and cooling to 18 buildings, with a total network length of 4 km (2.5 mi). 3 Total cost calculated to be NOK $140M in Present cost listed is adjusted for inflation and currency conversion.

33 CASE STUDY DAS ELEKTRIZITÄTSWERK DER STADT ZÜRICH (EWZ) WASTEWATER HEAT RECOVERY PROJECT Zürich Wipkingen, Switzerland Rabtherm integrated heat exchanger installation in Zürich Wipkingen, Switzerland (source: rabtherm.com) Type: In-Line Sewage Heat Recovery Technology: m of Rabtherm Integrated Heat Exchanger Capacity: 1,000 kw total heating Heat Source: Raw sewage Commissioned: 1997 Cost 2 : $8M USD Service: 930 apartments, 1 office building, 1 commercial building, 1 shopping center The EWZ Wastewater Heat Recovery Project is the world's first wastewater heat recovery system in public sewers. Renewal of a main sewer line and reconstruction of 7 heating plants were the drivers for this project. The heat exchanger is cemented into the sewage channel and is designed for a service life of at least 50 years. The 201 m (660 ft.) long heat exchanger produces up to 1,000 kwh of energy per hour, saving 100 liters of heating oil per hour, resulting in a CO₂ reduction of 1,500 tons per year and noticeably cleaner air for the residents. (source: rabtherm.com) 2 Cost estimated based on general project costs listed on company website

34 CASE STUDY HELSINKI ENERGY: KATRI VALA HEATING & COOLING PLANT Helsinki, Finland Friotherm Unitop heat pump / chiller unit in the Katri Vala Plant (source: Type: Sidestream Sewage Heat Recovery Heat Source: Purified Wastewater & Sea Water Technology: - 5 x Unitop 50FY heat pump / chiller units Commissioned: 2006 Capacity: 90 MW of district heat output and 60 MW of cooling output The Katri Vala Heating and Cooling Plant in Helsinki, Finland is the world s largest heat pump plant, producing district heat and cooling in a single process. In the winter, purified wastewater is extracted from the outfall of the Viikinmäki Central Wastewater Treatment Plant and passed through the heat pump units to provide heating energy. In the summer, the cooling energy is obtained from the sea water.

35 CASE STUDY WHISTLER ATHLETES VILLAGE LOW TEMPERATURE DISTRICT ENERGY SYSTEM Whistler, British Columbia Whistler Athletes Village District Energy System (source: KWL.ca) Type: Sidestream Sewage Heat Recovery Technology: - Low temperature recirculating loop with heat pump systems in residential units - Large plate heat exchangers at WWTP Whistler WWTP Large Plate Heat Exchangers ( Heat Source: Purified Wastewater Commissioned: 2009 COP: 3.0 Capacity: Heating and DHW for 85,000 m 2 (915,000 ft 2 ) of residential space The Whistler District Energy System (DES) supplies heating and cooling for 85,000 m 2 (915,000 ft 2 ) of residential space in the Cheakamus Crossing neighborhood, which was originally constructed as the Athletes Village for the 2010 Winter Games. The DES extracts thermal energy from treated sewage effluent from the nearby Whistler Wastewater Treatment Plant and circulates it through a two-pipe, closed-loop system. The system is unique in that it can function in both heating and cooling due to the low-temperature ambient heat that is extracted from the wastewater. Heat pumps within the buildings convert the low-temperature ambient heat energy in the DES loop to higher intensity energy for heating and cooling purposes. Heat rejected from one building can be absorbed by the next building, allowing energy to be exchanged between buildings. It is estimated that the DES reduces greenhouse gas emissions by 96% when compared with conventional heating technologies.

36 CASE STUDY WINTOWER HIGH-RISE BUILDING AT WINTERTHUR Winterthur, Switzerland Type: Sidestream Sewage Heat Recovery Heat Source: Raw sewage Technology: - 1 HUBER Pumping Station Screen RoK4-2 RoWin Heat Exchanger units Capacity: kw heat input into the building kw heat extraction from building Commissioned: 2010 Service: 22,000 m 2 (240,000 ft 2 ) of commercial office space 2 RoWin Heat Exchanger units in Wintower Building (source: hubertechnology.com) A sewage heat recovery system was installed in a large office building in Winterthur, Switzerland in 2010 to meet its heating and cooling needs. The HUBER ThermWin system was installed and successfully put into operation to provide 600kW of heating and cooling energy. Wastewater is extracted from the sewer at a rate of approximately 660 GPM and pre-treated through a HUBER Rok4 screen before passing through one of the HUBER RoWin Heat Exchangers. Wintower Building (source: huber-technology.com)

37 CASE STUDY SEVEN35 BUILDING North Vancouver, British Columbia Seven35 by Adera Development Corp (source: sewageheatrecovery.com) Type: Sidestream Sewage Heat Recovery Heat Source: Raw sewage Technology: - SHARC sewage heat recovery system Capacity: - 35 kw domestic hot water recovery COP: 5.1 Service: 5,500 m 2 (60,000 ft 2 ) of residential space The Seven35 is a development in North Vancouver, British Columbia that consists of 60 townhomes, each approximately 93 m 2 (1,000 ft 2 ) in size. The SHARC system has FHP heat pumps with double walled, vented heat exchangers that recover waste heat from the exiting raw sewage and moves that heat into gallon domestic hot water (DHW) storage tanks. The DHW storage tanks are heated to 52 C (126 F) by the heat pumps. It is estimated that the SHARC sewage heat recover system provides energy savings of 75% for the building. The Seven35 application is an example of a decentralized sewage heat recovery system. (source: sewageheatrecovery.com) Sewage SHARC seven35 Townhomes (Photo: Mike Homenuke, KWL)