Environmental Engineering Reference
In-Depth Information
Storage Round Trip Eciency
98%
100%
95%
95%
95%
93%
90%
80%
80%
79%
79%
78%
80%
75%
70%
59%
60%
50%
50%
40%
30%
20%
10%
0%
FIGURE 7.1
Comparison of efficiencies of several energy storage technologies. (From Turchi, C. July 21,
2008. Thermal Energy Storage for Concentrating Solar Power Plants. National Renewable
Energy Laboratory.)
Temperature
T
liquid
T
Tmelt
Liquid
Sensible
Latent
Transition
T
solid
Solid
Sensible
ermal Energy
FIGURE 7.2
Plot of temperature versus thermal energy for material undergoing phase change.
