1. Analytical Study of a Modified Thermal Energy Storage System for PS10 in Aswan Prof. S.Abdelhady Faculty of Energy Engineering, Aswan University, Aswan, Egypt. Eng. M.Qenawy Faculty of Energy Engineering, Aswan University, Aswan, Egypt.

2. Outlines Introduction. PS10 Plant. M odifie d PS10 Plant. Storage system. Results. Feasibility study of Modified PS10 in Aswan. Conclusions.

3. Introduction Solar power plant CSP technology Line focusing Parabolic Trough Collector (PTC) Linear Fresnel Reflector (LFR) Point focusing Central Tower Receiver (CTR) Parabolic Dish Collector (PDC) PV technology

4. Introduction Central Tower Receiver Linear Fresnel Reflector PV Arrays Parabolic Trough Collector Parabolic Dish Collector

5. PS10 PS10 is a concentrating solar thermal power plant of 11MW. It is based on tower technology for grid- connected electricity generation. PS10 plant is located in the town of Sanlúcar la Mayor, Spain, 25 km west from the city of Seville.

6. PS10

7. General Descriptions Lat 37.4º, Lon 6.23º Tower Height Technology Saturated Steam Thermal Storage Capacity Thermal Storage Technology Heliostats 624 @ 121m 2 Water/Steam 50min @ 50% Rate Steam Cycle 40bar, 250ºC 23.0GWh Annual Electricity Production Emplacement Nominal Power 100m 11.02MWe

8. PS10 While PS10 successfully demonstrated power tower technology, it also revealed the disadvantages of a water/steam system, such as the intermittent operation of the turbine due to cloud transience and lack of effective thermal storage. To encourage the development of Concentrating solar tower, we should seek to redesign the storage system for PS10 plant to increase its thermal storage capacity.

9. Modified PS10

10. The molten salt or solar salt is a nitrate salt. 60%NaNO3 sodium nitrate. 40%KNO3 potassium nitrate. Specific heat of (Cp=2660 J/kg∙k.). Density of ( ρ =1870kg/m 3 ). It has high stability at high temperature up to 600°C Which is Suitable for working at high solar density in Aswan (23.5 o Latitude - 33 o longitude).

11. Storage system 1- Tower 2- Hot storage tank

12. Storage system 4- Cold storage tank 3- Steam generator

13. Results Previous equations have been represented in the programs of MATLAB and Excel sheet to display the results. In this analysis, we take 21 th March as a reference day for plant operation.

14. Results Solar irradiance, 21,22 th March. AswanSpain

15. Results Cyclic operation of hot and cold tanks, 21,22 th March. SpainAswan

16. Results Cyclic operation of hot and cold tanks, 23,24 th March. SpainAswan

17. PS10 Main results MPS10,Spain Operating salts [ton] Capacity factor [%] 214 Items Storage volume [m 3 ] 37.5 [90MWh] 400 MPS10,Aswan 300 560 45.8 [110MWh]

18. Feasibility study of MPS10 in Aswan PS10 in Spain was built in December 2005 and opened in March 2007. The total Cost is ($47M), the specific cost is about 4200$/kW gross. The total calculated cost of the PS10 for Spain and Aswan in 2013 is ($50.6M), the specific cost is about 4600$/kW gross.

19. PS10 Cost analysis 4% Receiver cost Tower cost 5% Indirect cost Land cost Power block cost 20% 2% 17% Storage cost Solar field cost 13% 39%

20. Feasibility study of MPS10 in Aswan

21. The landing cost of the MPS10 ($1M) is ignored in Aswan due to the governmental support for encourages national energy project on desert lands. The indirect cost ($8.6M) also is reduced in Aswan due to the relatively low cost of labour and transportation. In Europe, about ($2.2 M) of the capital cost yearly goes for operating and labours. In Aswan, the yearly operating and labour cost is reduced by 75% (equal about 0.5M $/year).

22. Conclusions The PS10 plant in Spain is used as a demonstrative model in order to estimate the relative advantage of installing a modified storage one in Aswan. PS10 with two tanks molten salts thermal energy storage system (MPS10) in Spain increasing the capacity of the existing PS10 by (25MWh) daily. The daily capacity of MPS10 in Aswan (110MWh) is higher than the capacity of the MPS10 in Spain (90MWh).

23. Conclusions The capital cost of MPS10 in Spain ($50.348M) is less than the capital cost of the existing PS10 in Spain ($50.6M). And the Storage cost of MPS10 in Spain ($1.628M) lowers than the storage cost of MPS10 in Aswan ($2.023M). The feasibility study shows that installing MPS10 in Aswan saving about ($7.9M) labour and indirect cost. And helping for accommodate the life in it.

24. Analytical Study of a Modified Thermal Energy Storage System for PS10 in Aswan Thank you M_qenawy@ymail.com