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Development of an integrated community energy system - Study report.

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DEVELOPMENT OF AN INTEGRATED COMMUNITY ENERGY SYSTEM STUDY REPORT Presented July, 2004 To the Tulita Yamoria Community Secretariat (c)2004 Enterra Environmental Corporation, all rights reserved1 Map of the NWT The cover photograph was taken by a satellite and shows the area of Great Slave Lake and Lower half of Great Bear Lake with Tulita in upper left corner and the Mackenzie River and Liard River in the lower left corner of the photograph. Table of Contents 1 Contact Sheet 1.1 Community Description 1.2 Business Structure 1.3 Affiliated Project Proponents 2 EXECUTIVE SUMMARY 3 INTRODUCTION 3.1 Market Characteristics 3.2 Description of District Energy Technology 3.3 Benefit Statement 3.4 Study Scope 4 ENERGY DEMANDS 4.1 Building Loads 4.2 Load Diversification Factor 5 PRODUCTION PLANT 5.1 Overview 5.2 Combined Heat & Power Development Concept 5.3 Geothermal Production Well & Heat Pump 6 DISTRIBUTION NETWORK 6.1 General 6.2 Distribution Network Pipe Routing & Sizing 6.3 Distribution Piping Material 6.4 Distribution System Capital Costs 7 ENERGY TRANSFER STATIONS (ETS) 7.1 General 7.2 Building Connection - Heating 7.3 ETS Capital Costs 8 FEASIBILITY ASSESSMENT 8.1 Capital Cost Summary 8.2 Customers' Costs Using Conventional Heating 8.3 Pro Forma Revenues and Expenses 8.4 Discussion 9 IMPLEMENTATION 10 APPENDIX B: CAPITAL COST ESTIMATE 11 APPENDIX C: FINANCIAL PROJECTION 12 APPENDIX D: BUILDING SURVEY 12.1 BLDG# 1 - HOTEL (8000 FT�) 12.2 BLDG# 2 - BAND ADMINSTRATIVE (7500 FT�) 12.3 BLDG# 3 - NORTHERN STORE (7000 FT�) 12.4 BLDG# 4 - PROPOSED STAFF HOUSING (6000 FT�) 12.5 BLDG# 5 - PROPOSED SCHOOL (12,000 FT�) 12.6 BLDG# 6 - HAMLET GARAGE (2000 FT�) 1 Community Description Tulita is in the Sahtu Region of the NWT located on the banks of the Mackenzie River, 611 km northwest of Yellowknife. The community area is 52 km2, with a population of approximately 506 individuals, and 156 dwellings. There is 1 school, 1 nursing station, 1 library, 1 hotel, 1 store, 2 churches, water treatment plant, thermal generation plant, recreation centre and swimming pool (under renovation). ...read more.


This factor is known as load diversification. The mix of buildings contained within a district energy system allows for this factor in sizing the production plant and distribution system. It is estimated that the diversification factor for this system will be 0.9. Therefore the total heat load is 1947 MWh 5 Production Plant 5.1 Central Energy Plant Development Concept The plant concept would be to install the containerized CHP unit, switch gear, controls, and constant & variable speed pumps to pump hot water through the distribution system and ultimately to every commercial & public building in the community. Table - 2 Production Plant Capital Costs Description of Plant Components Costs CHP Unit: * 70 kWe /140 kWt * Switch Gear * Skidded Enclosure Pumping/Control System: * Constant speed pumps * Variable speed pumps * Controls * Monitoring station $135,000 $22,000 $7,500 $35,000 Total $199,500 5.1.1 Geothermal Energy (phase 2) All land on earth can successfully harness geothermal energy using heat pumps that can be: * Used for space heating/cooling and water heating * Work by concentrating naturally existing heat * Acts as a heat source in winter and a heat sink in summer Photo24 #2 5.1.2 System Capacity Based on the proposed configuration of the completed system (phases 1 - 3) of geothermal heat, heat pump, micro turbine, and storage tanks, can provide 5865 GJ of thermal energy. This system capacity is based on the concept of expansion by adding another micro turbine and increasing the thermal storage. The limiting factor of the district energy network would be the piping, as only so much thermal capacity can be delivered through the pipe. During the next stage of the project development, detailed sizing will have to be performed to ensure that the future expansion of community is considered. 6 Distribution Network General A preliminary distribution piping concept was developed including routing, sizing and material selection that will provide district heating services to the target buildings in each zone (see below). ...read more.


11 70 kWe & 140 kWt micro turbine to increase the heat content of the water and powers the heat pumps. 12 Solarwall(tm) passive air collectors. 13 Moves heated medium (water) through pipes connected to the building energy transfer station and provides space and water heat. 14 Tulita energy costs are electricity $0.79 kWh; and heating oil $0.87 litre 15 $230 million 2002 16 NWT 2003 Budget $931 million - Total projected deficit $214 million 17 The Government of Canada has launched the Pilot Emission Removals, Reductions and Learning (PERRL) Initiative. 18 i.e., no boiler capital, maintenance or replacement costs, no fuel system capital or maintenance cost, no fuel spill risk or fuel fire risk, no primary pumping costs, no costs associated with control systems for boiler, fuel system. 19 $0.87 per litre in Tulita, 2004 20 Buildings owned by the Two Rivers Development Group Ltd. 21 Estimated heating demand. 22 The red denotes new construction 23 The building will retrofit to accommodate self government administration staff. 24 Photo: Two 36 ton geothermal heat pumps (www.eere.energy.gov) 25 See map in appendix 26 See appendix for distribution piping - full build out heating 27 Commercial customers only, due to a complicated system of subsidies & rebates the true cost of fuel are not passed on to seniors or residential customers. 28 For Phase 1 building only (hotel, administrative offices, seniors & staff housing, hamlet garage) 29 The system would be connected to all the commercial & public buildings in Tulita 30 The estimated cost for heating with electrical heat for all of the targeted buildings is $174,064. 31 Letter of Intent accepted July 6, 2004 32 The public administrative sector in Yellowknife uses 58,000,000 litre/per annum. 33 The Giant Mine site has 235,000 tonne of arsenic waste stored in chambers below the surface. The plan will require the pumping and circulating of water to be treated and the freezing of ground water surrounding the storage chambers. Both operations are both sources of low grade thermal energy. Tulita Community Energy ProjectThe Vision for a sustainable community shared by citizens, council, business, institutions, and organizations 1 ...read more.

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