RAMBOLL THERMAL TECHNOLOGY WITH DISTRICT ENERGY SYSTEMS

Transcription

1 RAMBOLL THERMAL TECHNOLOGY WITH DISTRICT ENERGY SYSTEMS

2 RAMBOLL ENERGY REFERENCES 800 ENERGY SPECIALISTS

3 EVOLUTION OF DISTRICT HEATING

4 HOEJE TAASTRUP DISTRICT HEATING COMPANY DISTRICT ENERGY NETWORKS (PLANNED AND EXISTING) EC1 EC2 EC1 EC2 District heating District cooling EC1: Energy Centre at Copenhagen...Flower and Fruit Market..(In operation since April 2016) EC2: New Energy Centre (2017)

5 HØJE TAASTRUP DISTRICT HEATING COMPANY PLANS OF A NEW DISTRICT ENERGY PLANT Main objective: Supply of district heating Supply of district cooling Attraction / maintenance of (more) consumers Main components: Large heat pumps Storage tanks Seasonal storage: ATES (groundwater) and pit storage Pipe network in the ground

6 ENERGY CENTRE AT COPENHAGEN FLOWER AND FRUIT MARKET (IN OPERATION SINCE APRIL 2016) Key figures: 2.2 MW cooling to the flower and fruit market 3.2 MW heat to the district heating (DH) system 1 heat pump: 75 C in supply to DH 45 C in return from DH 2 chillers: -8 / -3 C in supply to chilled glycol/water circuit +1.5 C in return to chilled glycol/water circuit

7 NEW ENERGY CENTRE (PLANNED OPERATION START IN 2017) Key figures: Future plans: 1.0 MW District Cooling (DC) to consumers 1.4 MW District Heating (DH) to consumers 1 heat pump: 6 C in supply to DC / 16 C in return from DC 75 C in supply to DH / 45 C in return from DH Aquifer Thermal Energy Storage (ATES) - Seasonal storage Thermal Energy Storage Tank(s) Additional heat pump capacity More DC consumers and extension of pipe network 11 MW in total DC supply 7 MW in total DH supply

8 HØJE TAASTRUP DISTRICT HEATING COMPANY COPENHAGEN MARKETS COOLING DISTRIBUTION

9 NEW ENERGY CENTRE (PLANNED OPERATION START IN 2017) Key figures: Future plans: 1.0 MW District Cooling (DC) to consumers 1.4 MW District Heating (DH) to consumers 1 heat pump: 6 C in supply to DC / 16 C in return from DC 75 C in supply to DH / 45 C in return from DH Aquifer Thermal Energy Storage (ATES) - Seasonal storage Thermal Energy Storage Tank(s) Additional heat pump capacity More DC consumers and extension of pipe network 11 MW in total DC supply 7 MW in total DH supply

10 THE LOW-TEMPERATURE DISTRICT HEATING (LTDH) CONCEPT DH temperatures: Approx. 55 C from the heat plant / substation C at the consumer C in return Optimized DH design concept: Twin pipes Small pipe dimensions / higher pressure Large pipe insulation thickness (high insulation serie / class) Low-temperature unit / flat station at all consumers 10

11 LOW TEMPERATURE DISTRICT HEATING SØNDERBY, HØJE TAASTRUP, DENMARK New supply concept: Mixing shunt with a 3-pipe connection! Return water from the main DH network is used as low-temperature supply "The hot supply" is only used to ensure sufficient temperature Advantages for pipe network: Lower heat loss, increased capacity (almost without investment costs, increased energy efficiency in the heat production (condensing CHP etc.) 80% of the supply! 11

12 THE LOW-TEMPERATURE DISTRICT HEATING (LTDH) CONCEPT FLAT STATIONS FLAT STATIONS FLAT STATIONS HEAT SUPPLY FROM DH NETWORK HEAT EXCHANGER OR MIXING SHUNT PIPE NETWORK SUPPLY C RETURN C 12

13 LOW TEMPERATURE DISTRICT HEATING SØNDERBY, HØJE TAASTRUP, DENMARK Project objective Demonstrate low-temp. DH in existing buildings 75 single-family houses from Floor heating DH units with hot water tank (many was not in a good condition anymore) Existing pipe network had a large heat loss (43%) New installations District heating network District heating exchanger units Shunt station (central) with utilization of return water 13

14 SOLAR THERMAL DISTRICT HEATING AND SEASONAL HOT WATER STORAGE

15 VOJENS - CONCEPT Electrical boiler Solar Thermal Plant Gas fired boilers Seasonal Storage Heat pump Thermal Storage Tank Heat network Co-Generation/CHP (biomass or gas)

16 KEY PROJECT DATA Aperture area (effective): 70,000m 2 Number of solar collectors: 5,439 Phase : 17,500m 2 and a 3,000m 3 steel tank Phase /2014: 52,500m 2 Storage capacity: 205,000m 3 Share of annual heat demand: ~45% Calculated peak capacity: Calculated annual production: 49MW 28,000MWh

17 VOJENS: HEAT DEMAND AND SOLAR THERMAL Heat demand: MWh/a m² Solarthermie: MWh/a Annual solar produced:48% 14,000 12,000 10,000 MWh 8,000 6,000 4,000 Bedarf Solarwärme Inhalt Speicher 2,000 0 jan feb mar apr maj jun jul aug sep okt nov dec 17

18 205,000 m³ Heat storage tank (in former gravel pit) 6 months to fill 54,000 m² Additional solar thermal collectors (originally: 17,500m²) Expected heat production: 28,000 MWh / year

19 HALF WAY THROUGH

20 READY FOR FILLING

21 3 MONTHS LATER

22 INSULATED ROOF

23 RESULTS Heat storage: 4.5 m $6.7m CAD Solar heating plants, transmission, building, etc m $17m CAD Total costs 16.0 m $23m CAD Annual Savings 1.35 m $ 2m CAD Heat produced: Old plant: New plant: Heat losses: For use: New plant adding: 7,500 MWh. 26,500 MWh. 4,000 MWh. 30,000 MWh. 22,500 MWh. (30,000 MWh 7,500 MWh) Price for additional heat: 40 / MWh. ($60/MWh) (present heat, natural gas, 60 / MWh ($88/MWh)

24 VOJENS Next generation of buried pipes: Twinpipes, insulated class 3 or better. Present is single pipes, standard insulation. Goal: < 10% heat loss. Design and operation: Design; 90 degrees C flow, 30 degrees C, return. (Small pipes) Operation; 65 degrees flow, 30 degrees C, return. (above freezing point, ambient) Result: Small pipes, operated at low temperatures. Minimum heat losses. Cheapest to install. Cheapest to operate.

25 LESSONS LEARNED. Underground conditions are critical. Geotechnical investigations is a must. Sand, clay, ground water, mechanical stability etc. Weather conditions are critical. Rain can harm the slopes. Liner can only be welded if: No rain. Only little wind. Not too cold.

26 BUNHILL PHASE 2 HEAT AND POWER

27 AMAGER BAKKE WASTE TO ENERGY 560,000 tonnes waste per annum 63 MW e 157 MW th Heating 150,000 homes in Copenhagen Ski hill incorporated into the design for the rooftop space

28 QUESTIONS?