5-pcm.pdf - University of Sharjah | Department of...

This preview shows page 1 out of 3 pages.

University of Sharjah | Department of Sustainable and Renewable Energy Engineering Energy Storage & Transmission Lab – 0406452 Spring 2016-17 Latent Energy Storage Instructor : Anis Allagui ([email protected]) Lab Engineer : Monadhel Abdul Jabar Alchadirchy ([email protected]) Last Updated : September 26, 2017 1 Introduction It is known that all substances can hold a certain amount of heat; this property is their thermal capacity. When a liquid is heated, its temperature rises to the boiling point. This is the highest temperature that the liquid can reach at the measured pressure. The heat absorbed by the liquid when raising the temperature to the boiling point is called sensible heat . The heat required to convert the liquid to vapor at the same temperature and pressure is called latent heat . This is the change in enthalpy 1 during a state change. Thermal energy storage (TES) systems are varied, and include designed containers, underground aquifers and soils and lakes, bricks and ingots. Some systems using bricks are operating in Europe. In these systems, energy is stored as sensible heat. Alternatively, thermal energy can be stored in the latent heat of melting, in materials such as salts or paraffin (wax). Latent storages can reduce the volume of the storage device by as much as 100 times, but after several decades of research many of their practical problems have still not been solved. Latent heat energy storage is all about utilizing phase-change materials (PCMs) that are substances with high heat of fusion, which enables them to store high amounts of energy due to the heat absorption during the phase change. This happens at a constant temperature. The PCM is usually chosen according to its melting point: a PCM with low melting point would need the lowest amount of energy possible and still achieve a phase change. A complete storage process involves at least three steps: charging, storing, and discharging as shown in figure 1. The basic principle is the same in all TES applications. Energy is supplied to a storage system for removal and use at a later time. What mainly varies is the scale of the storage and the storage method used.
Image of page 1
You've reached the end of this preview.
  • Spring '12
  • rauf

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern