Seasonal Storage Solutions

Size: px
Start display at page:

Download "Seasonal Storage Solutions"

Transcription

1 Seasonal Storage Solutions Niels From, PlanEnergi Vojens, DK Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 1

2 PlanEnergi Consultants 3 years with RE 3 employees Offices in Skørping Aarhus Copenhagen Distict heating Solar thermal Seasonal storages Heat pumps a.m. Energy planning Biogas Wind turbines Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 2

3 Seasonal storage references SUNSTORE 3 in Dronninglund, DK, 214, 6 m 3 Boreholes in Brædstrup, DK, 212, pilot SUNSTORE 4 in Marstal, DK, 212, 75 m 3 Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 3

4 Agenda Types of Thermal Energy Storages (TES) Feasibility of SDH + short term storage Feasibility of SDH + long term storage Optimal collector area and storage Summary Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 4

5 Model of Brædstrup in Legoland Types of Thermal Energy Storages TTES Steel tank BTES Borehole storage PTES Pit heat storage ATES Aquifer storage Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 5

6 SDH without storage Heat production / [MW] Time / [hours] Storage energy content / [MWh] Direct solar To storage From storage Boiler Demand Storage content Empty storage Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 6

7 SDH with short term storage Heat production / [MW] Time / [hours] Storage energy content / [MWh] Direct solar To storage From storage Boiler Demand Storage content Empty storage Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 7

8 SDH with short term storage Technology: Steel tank (TTES) ΔT 9 C 4 C = 5 K 1 MWh 18 m 3 Investment = 135 /m 3 Example (without heat losses) 5 m 3 28 MWh MWh * 2 cycles/year * 2 years = 112 MWh Storage costs = 675 / 112 MWh = 6 /MWh Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 8

9 SDH with short term storage Heat production / [MWh] Storage energy content / [MWh] Jan Feb Mar Apr Maj Jun Jul Aug Sep Oct Nov Dec Time / [month] -6. Direct solar To storage From storage Boiler Demand Storage content Empty storage Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 9

10 SDH with long term storage Heat production / [MWh] Storage energy content / [MWh] Jan Feb Mar Apr Maj Jun Jul Aug Sep Oct Nov Dec Time / [month] -6. Direct solar To storage From storage Boiler Demand Storage content Empty storage Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 1

11 SDH with long term storage Technology: Water pit (PTES) ΔT 85 C 45 C = 4 K 1 MWh 22 m 3 Investment = 1.5 M + 15 /m 3 Example (without heat losses) 133 m 3 6 MWh 3.5 M a 6 MWh * 1 cycle/year * 2 years = 12 MWh Storage costs = 3.5 M / 12 MWh = 29 /MWh b a) 5 times cheaper/m 3 compared to tank storages b) 5 times more expensive/mwh compared to short term Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 11

12 Optimal collector area and storage Marstal, DK Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 12

13 Optimal collector area and storage Example: Medium sized Danish DH plant 43 1 MWh/year Reference production = Gas boilers (5 /MWh) Supplementary production = SDH Without storage Or with 5 m 3 steel tank (.7 M ) Or with 2 m 3 pit heat storage (4.5 M ) SDH investment =.2 M + 18 /m 2 Annual capital costs = 6% of investment Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 13

14 Net SDH production vs. Collector area 3. Net solar production / [MWh/year] Collector area / [m2] No storage Short term storage Long term storage 5 kwh/m2/year Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 14

15 SDH heat price vs. RE share 6 SDH heat price / [ /MWh] No storage Short term storage Long term storage 5 /MWh % 1% 2% 3% 4% 5% 6% 7% RE share Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 15

16 Total heat price vs. RE share 6 Total heat price / [ /MWh] No storage Short term storage Long term storage 5 /MWh % 1% 2% 3% 4% 5% 6% 7% RE share Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 16

17 Summary SDH with short term storages is feasible Production price < 3 /MWh RE share 2-3% SDH with seasonal storages can be feasible Production price < 4 /MWh RE share 4-6% Seasonal storages must be cheap (< 3 /m 3 ) Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 17

18 Thank you for your attention M T Seasonal Storage Solutions Aarhus, May 31, 217 Niels From 18