Foreningen DaCES – Dansk Center for Energilagring Frederiksholms Kanal 30,
Thermal energy storage, pointedly pit thermal energy storage, is a technology that will contribute to the future of district heating and renewable energy systems. Heat storage is an enabler for the coupling of the electricity sector and the heating sector. The demand for energy storage will increase in a world with significantly fluctuating energy prices, which makes thermal energy storage technology particularly interesting.
A new pit thermal energy storage is now in operation in Høje Taastrup contributing to the heat supply of Copenhagen, Denmark. This 70.000 m3 storage is the first of its type in operation in Denmark. It is operating as weekly storage, as opposed to seasonal storage which is most often seen in these types of projects. This is done to carry the benefit of the fluctuating energy prices by for example producing heat through the use of electricity when the electricity prices are low and utilizing the stored heat to lower the consumption of fossil fuels in the heat consumption peak hours.
The next interesting aspect of the EUDP-supported development project is to monitor the storage operation and learn how to optimize it.
We, at PlanEnergi, are very pleased to be contributing.Planning, design, regulatory approval, tendering, construction, handover and commissioning of 70,000 m3 steam storage connected to VEKS’ transmission system and Høje Taastrup District Heating’s distribution system. Preparation of the plant geometry. Tendering, contracting, supervision and handover of earthworks and civil works. Works included site clearance, topsoil dewatering for later piling, excavation for reservoir storage and construction of earth embankments.
Contract value: DKK 74 million (10 M EUR)Project period: September 2019-2023
DENMARK: Copenhagen has adopted the ambitious goal of becoming a CO2-neutral city by 2025, and district heating plays an important role. The FlexHeat demonstration plant at Copenhagen''s Nordhavn harbor, which supplies cruise ship terminals with district heating, shows just how far you can get with electrification and sector coupling. It emits 315 fewer tonnes of CO2 annually, compared with the LPG gas-based alternative.
Discover how energy storage with VLT® drives ensures flexible power consumption to reduce emissions.
FlexHeat facility schematic diagram, Wiebke Meesenburg, DTU Mechanical Engineering
One way of creating flexibility in power consumption is through sector coupling, where excess electricity is stored in other energy systems. In the district heating supply, heat pumps with thermal storage can use power when it is plentiful and therefore inexpensive; and avoid using it in periods with peak loads in the system, for example, late afternoon, when most people come home from work and turn on lights and household appliances. The HOFOR (Greater Copenhagen Utility) FlexHeat project in Copenhagen''s Nordhavn is a prime example of this type of sector coupling. The thermal energy storage consists of 100 cubic meter tank and corresponds to a "virtual battery" of 4 MWh.
The FlexHeat plant can operate in six different modes. Intelligent switching between these modes ensures the plant runs as effectively and economically as possible in relation to electricity prices, and the weather forecast. For example, when wind turbines are harvesting at full power, prices are low and the FlexHeat facility can contribute to a higher coefficient of exploitation of green energy.
The challenge is that the purchase of electricity has to be determined a day in advance, before the market closes.
Tore Gad Kjeld, Energy Planner at HOFOR, explains: "Smart-operation of the facility is based on electricity prices and a weather prognosis, where we take into consideration the power consumption viewed historically under similar weather conditions. Along with current operation data, these data are fed into an algorithm, which helps us work out a plan for the next day''s use of electricity. The machine learns a bit every time, getting smarter and smarter because of the data that we feed into the system. This type of machine learning will make us even better in the future at operating the facility according to favorable electricity prices."
An electric boiler regulated by VLT® drives allows for a small boost in temperature, so the plant can quickly provide heat to customers from the storage tank in periods where electricity prices are highest. "VLT® AQUA Drive units can accelerate the heat pump from minimum to maximum performance in just a few minutes, while the electric boiler can be adjusted upward in just a few seconds," explains Tore Gad Kjeld, energy planner at HOFOR.
How much CO2 can the HOFOR FlexHeat plant at Nordhavn save the environment? Tore Gad Kjeld estimates that the savings today are about 315 tonnes of CO2 annually, seen in relation to LPG gas boilers, which would be the best fossil-fuel alternative to a district heating solution. And, in the future, when the electricity uptake becomes 100% green, the savings can potentially reach up to 430 tonnes of CO2 annually.
Discover how VLT® AQUA Drive FC 202 controls and protects all types of pumps. This drive is optimized for water and wastewater applications, and comes equipped with an integrated cascade controller.
DENMARK: The Everfuel HySynergy facility produces green hydrogen with the help of iC7-Hybrid power converters for efficient, cost-effective electrolysis.
CHINA: Thanks to several Danfoss DrivePro® services, Dahe Paper Group, a state-owned paper mill company in China, has reduced its costs, downtime, and failure rate.
POLAND: At district heating company PEC Gliwice, AC drives reduce energy consumption of electric motors by up to 40%. DrivePro® Site Assessment audits help ensure optimal efficiency.
NETHERLANDS: Retaining 80% capacity after 8000 cycles, SmartGrid smart battery containers promise 21 years of daily discharge and recharge without performance concerns.
Stockmann department store is located in the heart of Finland''s capital, Helsinki. It is the largest department store in Finland. It was started in 1930 and the building which is home to the department store has undergone several changes through the years. The most current enlargement project also involved Danfoss who delivered a huge district cooling substation to the department store. District cooling production was started in 1998 in Helsinki.
DENMARK: The FlexHeat district heating plant at Copenhagen''s Nordhavn harbor emits 315 fewer tonnes per annum of CO2 than the LPG gas-based alternative.
Copenhagen Retail ApS Bredgade 6, 1. DK-1260 Copenhagen K CVR. 42 10 78 67
SWEP plays major role in innovative Danish district heating project wherea former agricultural area in Høje-Taastrup on the outskirts of Copenhagen has been transformed into a thermal energy storage facility.
The facility or ''Heat pit storage'' as it is best known, supports the district heating system that serves the Copenhagen metropolitan area. Its purpose is to store district heating from four connected Combined Heat and Power (CHP) plants and three waste to energy plants when it is cheap to produce, then to distribute it when it is expensive to produce.
About Copenhagen retail store energy storage
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