Material Study pcm

Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ.

Phase Changing Material (PCM)

Thermal Energy Storage

Sudheer NandiM.Tech,MBA(Ph.D.)

Sustainable Energy ,S.korea.

What are PCM’s?

Absorbs heat

Liquid

Releases heat

Solid

Temperature is above melting point

Temperature is bellow melting point

3


Our Idea

• Storing PCM’s in the walls of the house/ building HVAC system.

• The goal is to sustain a specific temperature range for human comfort

• Decreasing the usage of energy by replacing air conditioners

• Used for heating the house in winter and cooling in summer


PCM Options


PCM Options

Thermal Energy Conversion Control Lab. Chonbuk Nat’I Univ. 7

Fig. 1. (a) Latent heat of melting of paraffin compounds [4]. (b) Latent heat of melting of non-paraffin organic compoun

ds [4]. (c) Latent heat of melting/mass of inorganic compounds [4]. (d) Latent heat of melting/volume of inorganic comp

ounds [4]. (e) Latent heat of melting of eutectic compounds


Encapsulation

• Prevents reactivity towards environment

• Compatible with stainless steel, polypropylene, and polyolefin

• Controls volume as phases change

• Prevents large drops in heat transfer rates


Solid-liquid-gas PCM – Applications 1• Macro-encapsulation• Failed due to poor thermal conductivity Failed due to poor thermal conductivity• Tend to solidify at the edges• Micro-encapsulation•Easily incorporated into construction materials• Steel, polypropylene• Usually embedded with high conductivity materials with high conductive structure

Material’s Used in PCM


Increasing Thermal Conductivity

• Metallic fillers

• Metal matrix structures

• Finned tubes

Aluminum filling with VSP 25 and VSP 50

PCM-Graphite MatrixFinned Tubes


The VSP25 filling provided the highest

thermal conductivity of 1W/(mK), which

is about six times that of pure paraffin

Total solidification time of PCM is shorter

with fins and lessing rings, but the total quan

tity of stored heat is slightly smaller


Conclusion• Thermal energy storage is imperative to make energy more

reliable and competitive

• Further research in phase changing material can improve the

efficiency of energy storage

• Design of the system is also important in optimizing energy

storage


References• Aghbalou, F., F. Badia, and J. Illa. “Exergetic Optimization of Solar Collector and Thermal Energy Storage System.” I

nternational Journal of Heat and Mass Transfer 49.7-8 (Apr. 2006): 1255-1263. ScienceDirect. Elsevier. 16 Nov. 2007 <http://www.sciencedirect.com/>.

• Badescu, Viorel. “Model of a Thermal Energy Storage Device Integrated into a Solar Assisted Heat Pump System for Space Heating.” Energy Conversion and Management 44.10 (June 2003): 1589-1604. ScienceDirect. Elsevier. 16 Nov. 2007 <http://www.sciencedirect.com/>.

• Denholm, Paul, and Robert M. Margolis. “Evaluating the Limits of Solar Photovoltaics (PVs) in Electric Power Systems Utilizing Energy Storage and Other Enabling Technologies.” Energy Policy 35.9 (Sept. 2007): 4424-4433. ScienceDirect. Elsevier. 16 Nov. 2007 <http://www.sciencedirect.com/>.

• Farid, Mohammed M., et al. “A Review on Phase Change Energy Storage: Materials and Applications.” Energy Conversion and Management 45.9-19 (June 2004): 1597-1615. ScienceDirect. Elsevier. 17 Nov. 2007 <http://www.sciencedirect.com.ezproxy.lib.utexas.edu/>.

• Fath, Hassan E. S. “Technical Assessment of Solar Thermal Energy Storage Technologies.” Renewable Energy 13.1-4 (Summer 1998): 35-40. ScienceDirect. Elsevier. 17 Nov. 2007 <http://www.sciencedirect.com.ezproxy.lib.utexas.edu/>.

• Kenisarin, Murat, and Khamid Mahkamov. “Solar Energy Storage Using Phase Change Materials.” Renewable and Sustainable Energy Reviews 11.9 (Dec. 2007): 1913-1965. ScienceDirect. Elsevier. 17 Nov. 2007 <http://www.sciencedirect.com.ezproxy.lib.utexas.edu/>.

• Koca, Ahmet, et al. “Energy and Exergy Analysis of a Latent Heat Storage System with Phase Change Material for a Solar Collector.” Renewable Energy (May 2007): 1-8. ScienceDirect. Elsevier. 16 Nov. 2007 <http://www.sciencedirect.com/>.

• Kousksou, T., et al. “Second Law Analysis of Latent Thermal Storage for Solar System.” Solar Energy Materials and Solar Cells 91.14 (Sept. 2007): 1275-1281. ScienceDirect. Elsevier. 19 Nov. 2007 <http://www.sciencedirect.com.ezproxy.lib.utexas.edu/>.

• Pasupathy, A., R. Velraj, and R. V. Seeniraj. “Phase Change Material-based Building Architecture for Thermal Management in Residential and Commercial Establisments.” Renewable & Sustainable Energy Reviews 12.1 (Jan. 2008): 39-64. ScienceDirect. Elsevier. 18 Nov. 2007 <http://www.sciencedirect.com/>.

• Regin, A. Felix, S. C. Solanki, and J. S. Saini. “Heat Transfer Characteristics of Thermal Energy Storage System Using PCM Capsules: A Review.” Renewable and Sustainable Energy Reviews (Aug. 2007): 1-14. ScienceDirect. Elsevier. 20 Nov. 2007 <http://www.sciencedirect.com.ezproxy.lib.utexas.edu/>.


Thank you for listening

14

Engineering

Material Study pcm