This document discusses phase change materials (PCMs) which can store and release large amounts of thermal energy during phase transitions between solid and liquid states. PCMs provide high energy storage density with small temperature changes. Thermal energy storage methods include sensible heat storage based on temperature change and latent heat storage using phase change. PCMs are classified as organic, inorganic, or eutectic and are selected based on properties like melting temperature and thermal stability. Applications of PCMs include construction materials, textiles, food/medical packaging, and automobiles.

1. SHRI MATA VAISHNO DEVI
UNIVERSITY
Topic : Phase change material
Submitted by : Junaid bhat
Enrollment n.o : 17mma007
Semester : 3rd[m.tech ]
Submitted to : Mrs varun datta

2. CONTENT
 Introduction
 Thermal storage
 Thermal storage methods
 Classification
 Advantage
 Disadvantages
 Applications

3. INTRODUCTION
 What is a PCM?
 It’s a phase changing material which stores and
releases energy during phase change example
water.
 These materials store, release or absorb heat as
they oscillate between solid and liquid form.
 Giving off heat as they change to a solid state and
absorbing it as they return to a liquid state.
 It stores large amounts of energy in a definite
volume.

4. CONTINUE….
 Energy is mainly stored as ‘latent heat’.
 It has high storage density with small temperature
swing.
 It can act as thermal storage system

5. CONTINUED…

6. CONTINUED..
 Two methods by which energy can be stored
include:
 Sensible heat storage.
 Latent heat storage.
 Since, amount of heat energy stored as the latent
heat will be higher than the sensible heat therefore
LHS system is preferred.

7. THERMAL ENERGY STORAGE
 Energy can neither be created nor be destroyed .
 But it can be stored ,so that it can be utilized when
the demand arises.
 Further available renewable sources of energy like
solar energy can be stored to serve the energy
need.

8. THERMAL STORAGE METHODS
 q=mcΔT for sensible
heat storage system
 Q=mΔH for latent heat
storage system

9. CLASSIFICATION
 Three classes of pcm are as under:
 Organic pcm
 Inorganic pcm
 Eutectic pcm

10. CLASSIFICATION

11. SELECTION OF PCM
 Melting temperature
 latent and sensible heat capacities
 Thermal stability
 Mechanical stability
 Cyclic property degradation
 Heat transfer characteristics

12. CONTINUED…
 Cost
 Corrosiveness
 Ozone depleting potential
 Fire hazard
 Ease of encapsulation

13. VARIOUS CONSIDERATIONS OF PCM
 Material Compatibility
 Material Properties
 Thermal Performance
 Packaging for Use
 Conditioning for Use
 Cost and Availability
 Health, Safety and Disposal

14. ADVANTAGES AND DISADVANTAGES
 Benefits:
 Higher storage density than sensible heat
 Smaller volume
 Smaller temperature change between absorbing
and releasing energy

15. DEMERTIS
 High cost
 Corrosiveness
 Density change
 Low thermal conductivity
 Phase separation
 Incongruent melting
 Super cooling

16. APPLICATIONS
 Construction-building materials
 Textiles
 Food packaging industry
 Medical packaging industry
 Automobile
 Transportation