RAMBOLL THERMAL TECHNOLOGY WITH DISTRICT ENERGY SYSTEMS

RAMBOLL THERMAL TECHNOLOGY WITH DISTRICT ENERGY SYSTEMS

RAMBOLL ENERGY REFERENCES 800 ENERGY SPECIALISTS

EVOLUTION OF DISTRICT HEATING

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)

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

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

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

HØJE TAASTRUP DISTRICT HEATING COMPANY COPENHAGEN MARKETS COOLING DISTRIBUTION

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

THE LOW-TEMPERATURE DISTRICT HEATING (LTDH) CONCEPT DH temperatures: Approx. 55 C from the heat plant / substation 50-55 C at the consumer 25-35 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

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

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 50-55 C RETURN 30-35 C 12

LOW TEMPERATURE DISTRICT HEATING SØNDERBY, HØJE TAASTRUP, DENMARK Project objective Demonstrate low-temp. DH in existing buildings 75 single-family houses from 1997-98 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

SOLAR THERMAL DISTRICT HEATING AND SEASONAL HOT WATER STORAGE

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)

KEY PROJECT DATA Aperture area (effective): 70,000m 2 Number of solar collectors: 5,439 Phase 1-2012: 17,500m 2 and a 3,000m 3 steel tank Phase 2 2013/2014: 52,500m 2 Storage capacity: 205,000m 3 Share of annual heat demand: ~45% Calculated peak capacity: Calculated annual production: 49MW 28,000MWh

VOJENS: HEAT DEMAND AND SOLAR THERMAL Heat demand: 60.000 MWh/a 70.000m² Solarthermie: 28.000 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

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

HALF WAY THROUGH

READY FOR FILLING

3 MONTHS LATER

INSULATED ROOF

RESULTS Heat storage: 4.5 m $6.7m CAD Solar heating plants, transmission, building, etc. 11.5 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)

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.

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.

BUNHILL PHASE 2 HEAT AND POWER

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

QUESTIONS?