Centralized and decentralized solar heating systems suitable for the future energy system
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1 Centralized and decentralized solar heating systems suitable for the future energy system Simon Furbo Department of Civil Engineering Technical University of Denmark Building 118, Brovej DK-2800 Kgs. Lyngby Denmark
2 Denmark 2050: Independent of fossil fuels Wind energy: 2017, 43% of electricity consumption 2020: 50 % of increased electricity consumption (incl. transport, heat pumps, ) Solar heating: 2030: 15% of decreased heating demand 2050: 40% of decreased heating demand - 80% of this by solar heating plants & 20% individual systems
3 How will solar heating systems achieve a good interplay with the energy system? Solution: Combined technologies and smart heat storage interacting with the electricity grid Smart heat storage: Gives flexibility Makes combinations of technologies possible Use cheap electricity Heat Pump CHP gasmotor Load/usage Solar collectors Backup boiler on biomass Heat storage
4 Solar heating plant - principle Heat exchanger Solar Solfangerfelt collector field Forbrugere Consumers District heating boiler plant
5 Solar heating plants 2013: Dronninglund 37,573 m² 2012: Marstal 33,365 m² 2015: Vojens 70,000 m² 2016: Silkeborg 156,694 m²
6 Solar heating plants by end of 2016 Solar heating plants by end of solar heating plants > 500 m² 110 in Denmark, 37% 1,648,383 m² in operation 1,317,635 m² in Denmark, 80%! Denmark
![Collector area, M m² Solar collector area [m²] Solar heating plants in Denmark Average solar collector area per plant Solar heating plants in Denmark 14,000 12,000 10,000 8,000 6,000 4,000 2,000 1.](/docs-images/77/75538900/images/7-1.jpg "4 1.2 Year 0 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 2017 Total district heating, PJ/year Solar district heating, PJ/year Solar district heating, % 2011 132 0.29 0.2 Planned plants: 371.")
7 Collector area, M m² Solar collector area [m²] Solar heating plants in Denmark Average solar collector area per plant Solar heating plants in Denmark 14,000 12,000 10,000 8,000 6,000 4,000 2, Year Total district heating, PJ/year Solar district heating, PJ/year Solar district heating, % Planned plants: m² Year
8 Euro/MWh Specific price [ /m²] Total collector field price [mio. ] Investment cost per m² collector Solar collector field price ,000 50,000 75, , , ,000 Collector field size [m²] Specific cost Total cost of collector field 120 Heat price versus year of construction Year of construction No storage or short term storage Long term storage
9 Solar heating plants interaction with variable electricity production improved and cost efficiency hardly influenced by: High solar fractions/long term heat storage due to: Simple heat storage technologies Large heat storages with small heat losses and low costs per volume Advantages by combining technologies Interplay with liberal electricity market
10 Cheap storage technology: Water pit and borehole storage No insulation to earth! Heat capacity per volume: Water: 4.1 MJ/Km 3 Soil: About 2.7 MJ/Km 3
11 Water pits Vojens 200,000 m 3 Marstal 75,000 m 3 Dronninglund 62,000 m 3 Gram 110,000 m 3
12 100 1,000 10, ,000 Area / volume [m²/m3] LARGE SYSTEMS small storage losses & lower specific costs Surface area per volume (Cylinder, Radius = Height) Volume [m3] Investment cost per m³ water equivalent [ /m³] 500 Ilmenau Crailsheim realised Aquifer study 450 Rottweil Tanks Steinfurt Pits 400 (K/W) BTES Make it big ATES 350 Kettmannhausen 300 Hanover 250 Stuttgart Hamburg 200 (HW) Bielefeld 150 Eggenstein Berlin-Biesdorf Munich Cost per equivalent m 3 Chemnitz (K/W) Neckarsulm (1. phase) Rostock 100 1,000 10, ,000 Storage volume in water equivalent [m³] Friedrichshafen (HW) Crailsheim Aquifer Potsdam Source: SOLITES Factor 12! Factor 25! Water pits for seasonal heat storage with water volumes > 60,000 m 3 : Yearly heat loss < 10%
13 Measurements Borehole storage, Brædstrup Water pit storage, Marstal Water pit storage, Dronninglund Water pit storage, Gram Size Maximum storage temperature Heat recovered from heat storage during first year Heat recovered from heat storage during second year Heat recovered from heat storage during third year Heat recovered from heat storage during fourth year Heat recovered from heat storage during fifth year m 3 soil, corresponding to about m 3 water m 3 water m 3 water m 3 water 50 C 90 C 90 C 90 C 44% 18% 78% 55% 38% 65% 90% 44% 102% 62% 91% 46% 67% 96%? Not used 38%? Water pits - challenges: Floating lid Removal of rain water Water quality/life time Liner/life time Construction Inlet arrangement Optimal operation
14 Individual solar/electric heating system for the future smart energy system Individual solar/electric heating systems with heat storages, which can be heated by solar collectors and by electricity in periods with low electricity prices Heat is produced by solar collectors and by electric heating elements or a heat pump Electric heating elements/heat pump if possible only in operation in periods where solar heat can not fully cover heat demand and where the electricity price is low System equipped with a heat storage and a smart controller operated by the energy system operator. The control based on: heat content in heat storage and house prognoses for heat demand prognoses for solar heat production prognoses for electricity production prognoses for electricity consumption prognoses for electricity price
15 ELEC-TO-HEAT Ongoing research project with Suntherm ApS, TI and DTU Byg with the aim to develop and demonstrate a smart heating system based on heat pump, heat storage and smart control for the future energy system
16 SUNTHERM heating system 1. Heat pump 2. Heat storage 3. Central heating unit 4. Smart control SUNTHERM heat of fusion storage: 70 cm cylinder design Content: 350 kg salt hydrate Heat content: 25 kwh
17 SUNTHERM control SMART HEAT control: - Control via internet or app - Detailed overview Based on prognoses for electricity costs and weather forecasts Solar radiation and wind energy production considered Heat demand for house known 48 hours ahead Heat content of heat storage considered Heat bill as inexpensive as possible
18 Smart solar tanks with variable auxiliary volume for solar heating systems Marketed Solar tank Smart solar tank Tank heated from the top Controller based on heat content and prognoses for heat demand, electricity production and consumption Increased thermal performance by up to 35% due to: Decreased tank heat loss Increased solar heat production Further, also additional improved cost efficiency due to: Use of low electricity price
19 Systems tested side by side 9 m² solar collector 735 l smart solar tank. Auxiliary: One electric heating element, three electric heating elements, heat pump Smart control system - heat content in tank, weather forecast, coming heat demand, coming solar heat production, coming electricity prices from NORDPOOLSPOT
20 Measured results for spring 2013 Electricity consumption of system with electric heating element(s) = 2.2 x electricity consumption of system with heat pump Heat price for systems with electric heating element(s) = 2 x Heat price for system with heat pump Theoretical calculations - results Strongly influenced by policy on energy taxation Home owner Heat price for house: 100% Heat price for house with 10 m² solar combi system: 75% Heat price for house with 10 m² smart solar heating system with electric heating elements and variable electricity price: 70% Heat price for house with 10 m² smart solar heating system with heat pump and variable electricity price: 35% Society Socio-economic benefit of smart solar heating systems compared with a reference scenario with fossil fuels Excellent interplay with energy system by use of smart controller operated by the grid responsible
21 Conclusions Centralised solar heating systems with smart long term heat stores Water pit and borehole storages promising technologies for solar heating plants Individual solar heating systems with smart solar heat stores Individual smart solar heating systems with electric heating elements/heat pump and variable electricity price are more cost-effective than traditional solar heating systems Solar heating systems with smart solar heat stores with electric heating elements/heat pump can help integrating wind power in the energy system and contribute to an increased share of renewable energy Solar heating systems with smart solar heat stores will be an important part of the future smart energy system Recommendations Increase research, development and demonstration efforts on: Water pits Borehole storages Individual smart solar/electric heating systems for low energy buildings Individual smart solar/heat pump systems for normal houses
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