Insulation that STORES energy! | Phase Change Materials

Have you ever wondered how ice keeps drinks cold?
As the ice cube melts, it absorbs heat or thermal energy from its surroundings. The molecular vibrations of the ice increases and the cohesive bonds between the molecules break apart, which forms water. During melting, the temperatures of both are also the same and don't increase. That’s why the drink stays cold.

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Chapters
0:00 Introduction
0:42 Phase Change Insulation
1:50 How it works
2:45 Advantages
4:50 Sponsorship
5:31 Uses
6:28 Disadvantages
7:04 Conclusion

Conversely, when water turns into ice, work is done by cohesive forces to bring the molecules closer together and reduce their vibrations. Energy or heat is released to allow them to stay together. This is called the latent heat of freezing.

Phase change insulation comes in panels measuring 4′ x 1.5′ x 3/8″. They weigh less than 1 lbs per SF. The outer covering is made of conductive materials like thick aluminum foil. They hold separate cells of squishy phase change material or PCM.

There are 3 main types of phase change materials:
Organic materials like paraffin wax or non-paraffin like fatty acids, esters, alcohols and glycols.
Inorganic materials like salt hydrates and metal alloys.
Eutectics which are a combination of organic and inorganic materials

This material works in 3 stages during the day.
Absorb - When the sun rises in the morning, the semi-solid phase change material starts absorbing thermal energy to melt.
Store - Throughout the day, the material continues to melt. It absorbs and stores up to 100+ BTU per square foot.
Release - During the night, the phase change material prepares for a new day by returning to its solid state.

Traditional forms of insulation like fiberglass, rockwool and foam resist the flow of heat by conduction, convection or radiation. Phase change insulation operates differently. They capture and store thermal energy or heat. In summer, they slow down indoor heat gain and in winter, they slow down heat loss.

It has excellent fire resistance. Both the interior paste and aluminum film didn't catch on fire. It has a Class A Fire safety rating, Flame spread of 5, Smoke developed index of 5.

The product is self-healing. In case a pocket is punctured, the material inside develops a thin, hard film that prevents the rest of the material from spilling out. The product is estimated to degrade less than 2% over 100 years. It comes with a 30 year warranty and guaranteed 20% energy savings for certain homes or buildings. This leads to lower CO2 emissions and lower water consumption. Its outer layers are recyclable and the inner components are non-toxic to both the environment and humans. It is odorless, it doesn’t off-gas or release any VOCs or volatile organic compounds.

It is very easy to install this insulation. It is pliable, lightweight, and easy to handle. It doesn’t require any prep work, clean up, maintenance or extra machines and tools. It lays directly on top of existing insulation in attics, or on top of suspended ceiling tiles. It doesn’t need to be mechanically fastened with staples.

Like with every product, there are some disadvantages. These mats don’t replace traditional insulation. They are used as a supplement. A pretty expensive supplement. They cost $3.50 per sq ft, but the price is expected to come down as production scales up.

Phase change materials work best in temperate climates. They need to have moderate to large variations between daytime and overnight temperatures. They don’t work well in coastal tropical regions where there is little variation between daily temperatures.

Phase change materials are not a silver bullet for better building performance. You have to consider the building orientation and available solar gain. They should be used with other energy efficiency measures, like improved levels of insulation, reducing drafts and efficient glazing.
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SOURCES:
https://www.youtube.com/watch?v=R6XtJ86Dwxw
https://www.youtube.com/watch?v=xFRu2mt6SgQ
https://www.youtube.com/watch?v=WGaNXmH4qg8
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#phasechange #science #insulation #buildingscience #construction

Видео Insulation that STORES energy! | Phase Change Materials канала Belinda Carr