Solutions that can improve energy efficiency: - Loft Insulation - Cavity Wall Insulation - Solid...

Good Morning everybody!

Buenos Dias a todos!

Solutions that can improve energy efficiency:

- Loft Insulation - Cavity Wall Insulation- Solid Wall Insulation - Floor Insulation- Draught Proofing- Glazing - New Construction Materials

UP TO 15% LOSS

Our learning outcome for today’s session

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EclipseCrossword.com

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1. The UK public electrical system uses 3 of these and a 4 wire system. Also the moon goes through them (Singular).

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2. Our climate is suffering a transformation or....

3. Products used for construction purposes.

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Be able to understand how Phase Change Materials (PCMs) improve energy efficiency in our existing buildings and future construction projects, helping to minimise global environmental issues

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Crossword Solution:

Phase Change Materials (PCMs):

Phase Change Materials, commonly referred to as PCMs, are products that store, release or absorb heat (Thermal Energy) 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 (Melting/Freezing).

Can you think of a common element in nature that is a

PCM? Interestingly, the simplest, cheapest and most effective Phase Change Material is water/ice.

Unfortunately, its freezing point of +32°F precludes it from the majority of energy storage applications.

Ice cubes are an illustrative example of how phase change materials work: as they melt in a drink, they absorb heat from their environment; as they solidify in the freezer compartment, they release heat into it.

During the change from the solid to the liquid phase and vice-versa, the material's temperature remains constant at 0 °C.

This is the reason why as long as there is a mixture of water and ice in a bucket with cans, you don’t want to remove the water until all of the ice has melted.

This hidden heat stored in the phase change is termed latent heat.

How PCMs work:

Types of

PCMs in Construction

http://www.youtube.com/watch?feature=player_detailpage&v=0jZ36LYAVWY

http://www.micronal.de/portal/basf/ien/dt.jsp?setCursor=1_290798





Consolidation Activity:“PCMs Quiz”

1. Find the students with the same colour sweet as yourself, now you are a PCM Team!

2. You have 5 minutes to read your part of the article that you have been given.

3. Have a chat with your team sharing with them what you have read and understood about PCMs. You have another 5 minutes for this process.

Now, it’s fantastic and exciting Quiz Time!

http://www.online-stopwatch.com/bomb-countdown/full-screen/

Phase Change Materials

PDMsQuestionnaire

Quiz

Bradford

College 2009LCB Safety Quiz

Which of the following statements correctly describes the properties of a phase change material?

a. A substance that requires a relatively small amount of heat to change from solid to a liquid.

b. A substance that requires a relatively large amount of heat to change from solid to a liquid.

c. A substance that does not change state, even at very high temperatures

d. A substance that absorbs large amount of humidity from the air.

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PCMs questionnaire Question 1

Bradford


Which of the following is an example of latent heat transfer?

a. Heat is applied to water at 75°C, which gets hotter until it reaches its boiling point of 100°C.

b. Heat is applied to water at 50°C, which gets hotter until it reaches its boiling point of 100°C.

c. Heat is applied to water at 100°C, which remains the same temperature until all the water is evaporated.

d. The heat source is removed, and the temperature of the water falls until it reaches room temperature or its freezing point of 0°C.

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Bradford


What temperature should phase change materials used in mechanically ventilated spaces change from a solid to a liquid?

a. 20°C.

b. 23°C.

c. 26°C.

d. 30°C.

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Bradford


Which of the following is an appropriate use of phase change materials?

a. To maximise the efficiency of HVAC systems.

b. As a replacement for insulation.

c. Applied to exterior walls.

d. To manage internal humidity.

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Bradford


Which of the following is NOT a required property of a phase change material?

a. High thermal conductivity.

b. Congruent melting.

c. A completely reversible freezing/melting cycle.

d. A large difference in volume when changing from solid to liquid.

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Bradford


Which of the following statements correctly describes the properties of a phase change material?

a. A substance that requires a relatively small amount of heat to change from solid to a liquid.

b. A substance that requires a relatively large amount of heat to change from solid to a liquid.

c. A substance that does not change state, even at very high temperatures

d. A substance that absorbs large amount of humidity from the air.

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Bradford


Which of the following is an example of latent heat transfer?

a. Heat is applied to water at 75°C, which gets hotter until it reaches its boiling point of 100°C.

b. Heat is applied to water at 50°C, which gets hotter until it reaches its boiling point of 100°C.

c. Heat is applied to water at 100°C, which remains the same temperature until all the water is evaporated.

d. The heat source is removed, and the temperature of the water falls until it reaches room temperature or its freezing point of 0°C.

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Bradford


What temperature should phase change materials used in mechanically ventilated spaces change from a solid to a liquid?

a. 20°C.

b. 23°C.

c. 26°C.

d. 30°C.

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Bradford


Which of the following is an appropriate use of phase change materials?

a. To maximise the efficiency of HVAC systems.

b. As a replacement for insulation.

c. Applied to exterior walls.

d. To manage internal humidity.

1


Bradford


Which of the following is NOT a required property of a phase change material?

a. High thermal conductivity.

b. Congruent melting.

c. A completely reversible freezing/melting cycle.

d. A large difference in volume when changing from solid to liquid.

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Be able to discover how Phase Change Materials (PCMs) improve energy efficiency in our existing buildings and future construction projects, helping to minimise global environmental issues.

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3


M

C

A

H

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P

H

A

S

E

N

R

G

I

E

A L S

Crossword Solution:

PCMs in ConstructionNANO PCMs

http://www.youtube.com/watch?v=qPaz5_Fp6as




Evaluation FormCould you please put your opinion

on the evaluation sheet?This form is totally anonymous!

Thank you for listening!

Has anybody got any question for me?

Conversion of unit temperatures

Formula to remember conversions:

[°F] = [°C] x 9/5 + 32

[°C] = ([°F] – 32) x 5/9

+32°F =

0° C

Solutions that can improve energy efficiency: - Loft Insulation - Cavity Wall Insulation - Solid...

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