25. Fachtagung von GEOTHERMIE.CH

Transcription

1 ENERGESTION SA Ingénieurs-conseils SIA 25. Fachtagung von GEOTHERMIE.CH Géothermie et réseaux de chaleur Du concept à la réalisation d infrastructures énergétiques performantes Martial Götz Fabrice Baertschi Présentation du :

2 Main facts 1. Lake Geothermy from history to realised energy plant 2. Projet CADéco Jonction (GE) An example of mix energy in a city environment 3. Projet CADéco Jonction (GE) Key facts to success and planning 4. Case Study : Centre sportif de Coppet (VD) 5. Drinking Water as energy ressource project 6. Conclusions 7. Questions 2

3 1. Lake as energy ressource Cooling (mainly) Heating (mainly) Cooling & Heating ETH 1960 s Neuchâtel 2010 s EPFL 1970 s Nestlé 1960 s GLN 2010 s GeniLac 2015/2020 List not complete 3

4 2. CADéco Jonction (GE) 1/3 High renewable District Heating (DH) network in the center of Geneva using Heat Pumps, Gas Boilers and solar thermal plant (Heat pump input : deep water source cooling ~ - 45m) 4

5 2. CADéco Jonction (GE) 2/3 Description Figures District Heating Substation (DHS) 44 [-] Cumulative DHS Power Cumulative DHS Energy (incl. losses) Heat Pump Power (long duty cycle) Gas Boiler Power (Peak demand) 32.2 MW 65.5 GWh/y 2x 4.9 MW 20 MW Solar panel plant (thermal) 600 m² District heating network length District heating energy density m 11.9 MWh/y/m Annual Ratio of energy production GWh 0.45; 1% 15.1; 23% 50.0; 76% Heat Pump Gaz Boiler Solar 5

6 2. CADéco Jonction (GE) 3/3 SIG Stakeholders Planning Strategy Property owners Geneva Town SIG Price Market and developing DH Geneva Town Politics : 100% Renewable in 2050 Stakeholders Geneva State Geneva Office Energy Connecting existing buildings in DH Maximize renewable energy Densify DH Engineers Geneva State Engineers Property owners Advice, consulting and execution Low price Geneva Office Energy Consumer portfolio 23% 39% Geneva Town Before 16 <DH Renewable< 19 cts/kwh 22% 16% Geneva State Fondations Private property GAS 12.5 cts/kwh After > 75% public consumers 6

7 Renewable energy in DH high costs? 3. Financial Issues Investment average ratio Subsidy Thermal Plant 42 % District heating networks (pipes + excavation) 48 % Operating CO₂ certificates District heating substation 10% Costs optimization Conception CHP Combined Heat & Power CHP + Reducing electricity demand for HP Heat uses in DH Hybrid energy - Lower Renewable Ratio i.e < 40% Not acceptable! 7

8 3. Financial Issues Complete heating costs [cts/kwh] Gas Gas + solar Gas + Wood Wood Gas + Heat Pump Heat Pump % 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% Complete costs : invest + energy + operating Power unit in this case study : ~ 500 kw Renewable Energy Ratio Gas price 2015 = 8 cts/kwh TF Tax Free (Fuel 80CHF/100l) 8

9 3. Financial Issues and levers Renewable energy in DH other arguments? Swiss CO₂ Taxes 120 CHF/t? Low variability cost 84 CHF/t Energy Mix Increasing CO₂ Taxes 60 CHF/t Renewable DH 38 CHF/t 16 CHF/t Plugin existing buildings Energy Contracting Output Swiss boiler CO₂ Taxes evolution costs Long durability Gas Boiler DH 75% 25% Fixed Costs Variable costs 35% 65% Fixed Costs Variable costs 9

10 4.Geothermy in cooling/heating : Coppet (VD) Indoor Pool Outdoor Rink High School Theater Coppet (VD) Sport Center Heat Pump with geothermal probes produces heating and cooling for the sport Center. 10

11 4.Geothermy in cooling/heating : Coppet (VD Wood Boiler Fuel Boiler (backup) DH DC Heat Pump Solar 11

12 5.Drinking Water as energy ressource project -84 m District Heating Heat Pump Heat exchanger Water wells and water table in Geneva 11 C Drink Water 0m -70m Moraine-Wurmienne Nappe du Genevois SIG-EP 12 C -110m Moraine-Rissienne 12

13 5.Drinking Water as energy ressource project 250 Typical daily water flow pumped (SIG) Typical Heat Demand in Winter (relative scale i.e. 6h00) => Heat storage should be considered! :00 00:30 01:00 01:30 02:00 02:30 03:00 03:30 04:00 04:30 05:00 05:30 06:00 06:30 07:00 07:30 08:00 08:30 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 17:30 18:00 18:30 19:00 19:30 20:00 20:30 21:00 21:30 22:00 22:30 23:00 23:30 Water Flow [l/s] 13

14 Drinking Water as energy ressource project 250 Typical daily water flow pumped (SIG) Débit Florence [l/s] Débit Velours [l/s] 200 * Cumulative Heat Pump Output Power with T = 1 K and COP = 3.5! MW * Daily production : ~ 49 MWh! 4.5 MW* :00 00:30 01:00 01:30 02:00 02:30 03:00 03:30 04:00 04:30 05:00 05:30 06:00 06:30 07:00 07:30 08:00 08:30 09:00 09:30 10:00 10:30 11:00 11:30 12:00 12:30 13:00 13:30 14:00 14:30 15:00 15:30 16:00 16:30 17:00 17:30 18:00 18:30 19:00 19:30 20:00 20:30 21:00 21:30 22:00 22:30 23:00 23:30 Débit [l/s] 3.4 MW * 2.1 MW* 1.3 MW* 14

15 Drinking Water as energy ressource project Protected Area Drilling not allowed Nappe principale Deep Nappe Water principale Table profonde Genevois Genevois Superficial Water Table Eaux-Vives/Chêne Bourg New Buildings TwoWater Wells Florence/Velours LEaux OFSP SIG Annual projected heat production : 17.7 GWh (COP 3.5 T evaporator : 1 K) 15

16 Conclusion Source : EPFL - LMS District Heating need a strong planning : Users needs (T, kwh, kw, actual price, actual structure fixed/variable price) Law (Minimal renewable ratio must be guaranteed, Environmental Taxes) Collaboration between stakeholders Price adequacy (difficulties to guess exact complete costs) Easements (specially in real property) Pluridisciplinary coordination (Public transportation, Police, other road work) District Heating offers : Sustainable infrastructure Lower Power installation ( PDHS > PINSTALLED) Network Storage + ΦSTATISTICAL Good scale factors in production prices Flexible renewable ratio High temperature Heat Pumps technologies (Friotherm) for existing buildings Expansion Network, especially when existing buildings are renovated (additional available power in DH network) Source : EPFL - LMS 16

17 Questions Source : EPFL - LMS Fabrice Baertschi Ing. Dipl. HES MSc [email protected] Source : EPFL - LMS 17