Performance Evaluation of single tank storage system

1. Performance Evaluation of single tank
storage system
Speaker : Basel Al-Muallim (MKM171053)

2. • Introduction .
• Problem statement.
• Literature review.
• Objective.
• Methodology.
• Conclusion.
• Content :

3. • Intorduction
:
• What is Concentrated Solar Power.
• Who it works ?
• Molten Salt Solar Towers.
• Thermal storage system
• Concept description of Thermocline Thermal Energy Storage
systems.

4. • Who it works
?

5. • Molten Salt Solar
Towers:
Molten salt solar towers:
• Employ molten salt as both HTF and storage medium.
• single-phase fluid (60% Sodium-Nitrate/40% Potassium Nitrate).
• The primary advantage of such plants is that the molten salt has a lower
operating pressure and better heat transfer than water receiver.
Kinds heat transfer fluid in Concentrated Solar Power by :
• Water.
• Oil.
• Molten salt.

6. • Thermal storage system :
Kinds of Thermal storage system :
1.By storage media :
• Sensible heat storage:
Thermal energy can be stored in the change of temperatures of substances that
experience a change in internal energy.
•Latent heat storage media:
Thermal energy can be stored nearly isothermally in some substances as the latent
heat of phase change .
•Chemical heat storage:
is by chemical reactions.(trees)

7. • Thermal storage system :
2. By Storage concept :
• Passive storage systems : are generally dual medium storage systems.
•Active storage systems : The (HTF) used in the solar field is also used as storage
material.

8. • Thermal storage system :

9. • Concept description of Thermocline
Thermal Energy Storage systems :

11. • Problem statement:
Why do we need it ?
•Run solar power plant during nights.
• Energy demands vary on daily, weekly and seasonal bases. TES is
helpful for balancing between the supply and demand of energy
• TES system for a particular application depends on storage duration,
economics, supply and utilization temperature requirements, storage
capacity, heat losses and available space.
• Cheap why to store energy.(pv)

13. • Literature review:
Paper title authors year
Development of a molten salt thermocline
thermal storage system for parabolic
through plants
J. Pacheco, S. Showalter and
W. Kolb
2002
Numerical and Experimental Investigation
on a Combined Sensible and Latent Heat
Storage Unit Integrated With Solar Water
Heating System
N. Nallusamy and R.Velraj 2009
Analysis of a latent thermocline energy
storage system for concentrating solar
power plants
K. Nythiananandam,
R. Pitchumani and
A. Mathur
2012
NUMERICAL SIMULATIONS OF
THERMAL ENERGY STORAGE SYSTEMS
WITH PHASE CHANGE MATERIALS
P. Galione, O. Lehmkuhl, J.
Rigola and I. Rodriguez
2014
Multi-layered solid-PCM thermocline
thermal storage concept for CSP plants.
Numerical analysis and perspectives
P. Galione, C. Perez-Segarra,
I. Rodriguez,
A. Oliva and J. Rigola
2015

14. • Literature review:
• 2002 , researchers do experimental investigation aimed at studying the
feasibility of a single tank thermocline storage with quartzite and silica sand
as only filler which have been the staple basis for many modelling validations
for such systems.
• 2009, researchers do experimental to prove the applicability of PCMs as
fillers for thermocline tanks which were used by different authors to validate
the modelling of PCM filled thermocline tanks
• 2012, researchers show different method such as heat-pipes and PCM fillers
were modelled for simplified a power plant model. A cascaded configuration
has been suggested in which three layers of different melting point PCM are
placed inside the tank.
• 2014, 2015 researchers do a studies focused mainly on the modelling and
design of the tank by means of accurate simulations but did not show the tank
performance in detailed from a techno-economic point of view.

15. • Objectives :
The specific objectives are as follows:
1. To develop a flexible model of a single tank storage system
2. To implement such model in a dynamic simulation tool
3. To investigate the techno-economic performance of such system.
4. Make Comparison with to the tow tanks solution .

16. • Methodology:
• Model development and implementation: This part of the work aims at
creating a suitable model for both steady state design (Matlab) and dynamic
simulation (TRNSYS).
• Acquaintance with the current modeling tool and understanding of the main
requirements for the storage tank modeling
• Techno-economic evaluation of the performance of the single tank under
different market circumstances. This will involve a multi-objective
optimization to define the optimal design parameters for the tank together
with a performance comparison with the more acquainted two-tank solution.
(trade-off curve)

17. • Methodology:

18. • Conclusion :
• have lower specific cost than the two tank TES.
• to achieve higher efficiencies than two tank TES.