**3. Conclusion**

The introductory chapter of the book has presented the reader with basic knowledge needed to be an expert in the thermal energy storage field. It focused on the comparison between sensible and latent storage. The sensible storage is useful if the operating temperature range is higher. Latent storage system presents a great opportunity for storing heat in the narrow operating ranges. Phase change materials are used in variety of applications in the residential and commercial sector. It can stabilize the operation of different systems. Lastly multiple phase change materials can be deployed to magnify the energy storage potential.

*Paraffin - Thermal Energy Storage Applications*
