Use of Phase Change Materials for Thermal Comfort and Electrical Energy Peak Load Shifting - PowerPoint PPT Presentation

1 / 28
About This Presentation
Title:

Use of Phase Change Materials for Thermal Comfort and Electrical Energy Peak Load Shifting

Description:

The University of Auckland, New Zealand. U21 International Conference on Energy Technologies and Policy ... How heat is lost from buildings? What is thermal ... – PowerPoint PPT presentation

Number of Views:1688
Avg rating:3.0/5.0
Slides: 29
Provided by: amarkh
Category:

less

Transcript and Presenter's Notes

Title: Use of Phase Change Materials for Thermal Comfort and Electrical Energy Peak Load Shifting


1
Use of Phase Change Materials for Thermal Comfort
and Electrical Energy Peak Load Shifting
U21 International Conference on Energy
Technologies and Policy 8th to 10th September
2008, Birmingham, UK
  • Mohammed Farid and Nahidh Mecaial
  • Department of Chemical Materials
    EngineeringThe University of Auckland, New
    Zealand

2
Why Thermal Storage?
  • How heat is lost from buildings?
  • What is thermal energy storage (TES)?
  • Why do we want to increase thermal mass of
    buildings?
  • How can thermal energy be stored?
  • Why do we use phase change materials (PCMs)?
  • How do we use PCMs (micro and macro
    encapsulation)?
  • Demonstrating the benefits of using PCM.

3
Percentages of heat losses from ordinary homes
(EECA, 2004)
4
Thermal Mass of Buildings
  • Do we improve buildings insulation only or do we
    need to increase their thermal mass ?
  • How can we increase thermal mass of buildings
    without going back to the heavy construction used
    in the old days ?

5
Heavy thermal mass construction Egyptian
mud-brick rooms, 3200 years old
6
Phase Change Materials
  • What are the phase change materials (PCMs)?
  • How do they work?
  • How can they be encapsulated in building
    materials?

7
Phase Change (melting and solidification at
almost constant temperature)
8
Energy density of thermal storage materials
(Rubitherm, 2003)
9
THERMAL MASS OF PCM-GYPSUM WALLBOARDS (PCMGW)
10
FULL-SCALE SIZE TESTING FACILITY
Schematic plan view of outdoor full-scale
test-rooms
11
North-facing test rooms
CONSTRUCTION
12
THEORETICAL ANALYSIS AND SIMULATION
Table 1 Thermo-physical properties of the mass
types
Siding
Insulation
External Side
Internal Side
Table 2 Thermo-physical properties of the PCM
Gypsum Boards
Wood
13
USE OF THERMAL ENERGY STORAGE IN SUMMER FOR
THERMAL COMFORT
14
Solar radiation and wind speed measurements
(1st to 8th of January 2007)
15
Ambient and indoor rooms temperatures (1st to
8th of Jan., 2007)
16
Simulated inside rooms temperature (1st to 8th
of January 2007)
17
USE OF THERMAL ENERGY STORAGE IN WINTER FOR
CAPTURING SOLAR RADIATION AND SHIFTING HEATING
LOAD
18
Measurements of Solar radiation and wind speed
(18th to 21th of July, 2006)
19
Measured Indoor rooms temperatures (18th to 21th
of July, 2006)
20
Simulated indoor rooms temperatures (18th to
21th of July, 2006)
21
Solar radiation and wind speed measurements (17th
to 22th July, 2008) Heating systems (1am to 7
am), (850W)
22
Measurement s of rooms indoor temperatures
(17th to 22rd July, 2008) Heating systems (1 am
to 7 am), (850W)
23
Measurements of solar radiation and wind speed
(29th July to 3th August, 2008) Heating systems
(5 pm to 11 pm), (850W)
24
Measurements of indoor rooms temperatures (29th
July to 3th August, 2008) Heating systems (5pm
to 11 pm), (850W)
25
Effect of PCM quantity used Simulation of indoor
air temperatures
26
Effect of PCM melting point Simulation of indoor
air temperatures
27
NUMBER OF SUMMER DAYS BENIFITING FROM THE USE OF
PCM
39 full utilization 55.5 partial utilization
5.5 no utilization
28
CONCLUSIONS
  • Building materials impregnated with PCM
    efficiently smooth- out daily temperature
    fluctuations. It leads to a healthier interior
    spaces with more pleasant temperatures.
  • Use of PCM-building materials can reduce heating
    or cooling cost by using strategies of peak load
    shifting.
  • PCM-building materials could be installed with
    the same technique and equipments used for
    conventional building materials.
  • Micro or macro encapsulation of the PCM is
    necessary to prevent PCM leakage
Write a Comment
User Comments (0)
About PowerShow.com