Developing District Energy Projects Consultant Experience

Transcription

1 Developing District Energy Projects Consultant Experience Dr Gabriel Gallagher Rehau District Heating Workshop The Studio, 7 Cannon Street, Birmingham 27 th June

2 Introduction Independent renewable energy and district heating consultancy based in Cardiff Full cycle of services since 1998 with team of 13 engineers and energy professionals including CIBSE Heat Network Consultants Developed over 100MW of low carbon heating and power projects Designed and overseen installation of over 20km of district heating network Share experience and lessons learned from 18 years of designing and overseeing implementation of district energy networks

3 Case Study & Consultant Experience Experience in delivery of feasibility, design, clients engineer and commissioning and handover services for: Private developments Portmeirion Village (1MW biomass / 1.2MW Oil boilers) Social Housing Newport City Homes (2.5MW biomass / 4MW gas boilers) Bristol City Council (Phase 1 1MW biomass / 4MW gas boilers) Public sector buildings education, offices, leisure Blaenau Gwent County Borough Council (350kWe CHP / 1MW biomass / 10MW gas boilers) Bradford (4MWe CHP / 20MW gas boilers)

4 Portmeirion Village One of Wales premier visitor attractions 24 Historic buildings including castle, hotel, houses and swimming pool Site with steep gradient and significant bedrock to negotiate Keeping site open to visitors Sustainable Energy Ltd acted as Designer, Project Manager, Client Engineer and commissioning manager

5 Portmeirion Village New Energy Centre with 1MW wood chip boilers and 1.2MW of oil boilers & 30m 3 thermal store 1.7km of Rehau PEX heat network from hotel at sea level to Castle at 40m above Convert plant rooms to instantaneous hot water and 70/40 heating circuits Removed boilers from 24 individual boiler rooms Careful design of pressures to minimise hydraulic breaks

6 Key Points & Lessons PEX flexible pipework with large temperature differentials and high velocities to serve peak demands. This made significant reductions to capital cost and allowed loads at site extremities to be connected Make case to client for secondary system upgrades and include in design to achieve Best Practice - capital cost invested into properties and lifetime savings instead of easier option of a larger diameter network Be pragmatic - some selected secondary system upgrades were planned to be carried out in a replacement programme to spread out investment and limit disruption Provide stringent commissioning acceptance process and post installation monitoring to measure and prove that system is achieving original investment case

7 Duffryn Social Housing Scheme Client - Newport City Homes Principal Contractor - British Gas Wales largest district heating scheme Heat distributed to 1,000 (1 bedroom to 4 bedroom) homes and a Primary School

8 Duffryn Social Housing Scheme Acted for British Gas as designer and commissioning manager New energy centre 2,500kW biomass boiler 50,000lts thermal store Flue gas cleaning Integration with gas boilers

9 Secondary Side Design New HIUs with direct heating connection for heating New radiators sized for 60/30 Reduced temperatures and flow rates will increase efficiency and allow more buildings to be added to network

10 Key Points & Lessons Planning construction for Keeping Heat On Adding heat metering Connecting into existing heating systems Moving key utilities in construction area Working with clients existing systems and processes Encouraging best practice for secondary side upgrades to make most of the heating network

11 Bristol City Council Phase 1 Initial feasibility, heat profiling & financial case Detailed design and planning Construction of energy centre Heat network connections Commissioning of system ans substations Design future-proofed for additional connections to new developments, offices, hotels, private residential customers Designed to allow future input of additional low carbon heat Currently engaged on network extension and design for further connections

12 Bristol City Council Feasibility and Design 14 Social housing blocks connected in Phase 1 Detailed design of Energy Centre to integrate biomass and CHP with gas boilers Convert primary flow temperatures from 90 o C to lower 80 o C Use of PEX pipe for some sections Create cluster for future expansion of city wide scheme

13 Bristol City Council Phase 1 Energy Centre Build 1MW biomass boiler, thermal store and 4MW gas boilers into restricted space in underground energy centre

14 Bristol City Council Phase 1 Network Construction Management DN200 steel network for connection to future heat import into Phase 1 network REHAU PEX DN150 to help navigate underground services in narrow route between buildings

15 Key Points & Lessons Designing a viable scheme for initial network and current technologies with consideration for future expansion, network extensions and the import of additional low carbon heat Secondary side design and phasing of upgrades Reducing flow temperatures and return temperatures as network expand Ensuring new connections meet the required secondary side conditions and performance Considering multi-utility approach installed broad band ducts along route Long development timeframes manage the changes that happen between initial planning and build out!

16 The Works, Ebbw Vale Integrating Renewable Heat into Existing Network 10MW district heating School, leisure centre, college, offices, archives 3 x 2,900kW gas boilers 1 x 350kW gas fired CHP 2 x 500kW wood pellet boilers 35,000lts thermal stores Multi-stage pumps to increase turndown Primary network temperature reductions Secondary side modifications We acted as Principal Designer, Commissioning Manager for handover and provided RHI accreditation services

17 The Works, Ebbw Vale Integrating Renewable Heat into an Existing Network 75% of heat demand met with low carbon heat in Year 1

18 Key Points & Lessons Early phases of a future proofed scheme should be financially robust as planned customers may take longer to connect or developments may not be brought forward or built out Reduced initial uptake can lead to proportionally high heat losses and operational costs Renewable Heat Incentives improve financial viability and could make up initial funding gap Design pumping regime to expand with heat load to allow control of temperatures and flow rates in network Pipes larger than required at low demand Multiple smaller pumps and equipment

19 Bradford City Centre - Design HNDU funded Detailed Design of gas CHP and biomass district energy scheme for Bradford Metropolitan District Council 20 key heat and electricity connections in initial phase 12 in public sector Air Quality considerations Consideration for Future Energy from Waste heat import

20 Future Proofing Initial phase developed on public sector anchor loads Network and energy centre designed for proposed surrounding developments Future low carbon opportunities considered

21 Energy Centre Initial network phase requires 1.5MWe CHP and 10MW thermal gas boilers Energy Centre and network designed with space for 4MWe CHP, 20MWth gas boilers and facility for importing heat and power Supply 4MVA electricity through private wire

22 Energy Network Heat and private wire to initial city centre phase

23 Building Connections Design of building connections using skid mounted heat interfaces and allowing some buildings to retain existing boiler plant Providing customers/connections with clear guidance of the requirements they must meet for taking heat

24 Key Points & Lessons Hourly heat and electricity profile data essential to accurately model different scenarios of building out the scheme with CHP and biomass technologies Large thermal storage and private wire allows maximum value from CHP Air quality modelling of existing individual boilers vs centralised energy centre essential to select level of emission abatement systems (filters on biomass, SCR on CHP and flue gas recirculation on gas boilers) Detailed route planning at earliest stage

25 Summary Project stages must identify the full future opportunity but be flexible to find viable initial phases Detailed assessment of network civils risks find barriers early (initiate resolving them or avoid them) Secondary side systems require design changes to be clarified, although can be scheduled in with extending network Collaborative approach to network delivery will pay dividends Develop schemes which can accept lower temperature technologies in the future Multiple low carbon technologies integrated with Smart control of networks to schedule generation and optimise demand

26 Questions