Down with energy storage capsule

Is Energy Capsule behavior conned to nanocapsule core?

Energy capsule behavior compared with the bulk material was also observed at the macroscale with thermal imaging, showing that the melting/freezing behavior of the PCM is conned to the nanocapsule core.

How is heat transferred inside a spherical capsule?

The heat transfer inside the spherical capsule is governed by the thermal conduction of pure PCM. As the average melting fraction (B ( T )avg) increases, natural convection starts to intensify, resulting in an accelerated melting rate. At this stage (II), natural convection becomes the dominant mode of heat transfer within the capsule.

What is a spherical capsule filled with?

In Case A, the spherical capsule is filled with pure PCM. During the period from 0 to 1600 s, the melting process is in stage (I). The heat transfer inside the spherical capsule is governed by the thermal conduction of pure PCM.

What is the thermal conductivity of a capsule shell?

Thermal conductivity of the capsule shell was performed by laser ash thermal conductivity method employing a Nd/Cr/GGG glass fl laser (BLS400, Baasel Lasertech) working at a wavelength = 1.064 λ μm. The pulse energy was adjusted to keep the sample temperature increase below 5°C.

How does a spherical capsule melt?

During the period from 0 to 1600 s, the melting process is in stage (I). The heat transfer inside the spherical capsule is governed by the thermal conduction of pure PCM. As the average melting fraction (B ( T )avg) increases, natural convection starts to intensify, resulting in an accelerated melting rate.

How much mass do RSS capsules lose when heated?

By 800 C, RSS samples have lost between 37.2 and ° 43.7% mass due to the water chemically bonded to the silica shell. By comparison, polymer shell capsules will lose 70 − 100% mass upon heating to 800 C.45,57 ° Although all RSS capsules have similar thermal character-istics, the minor di erences can be rationalized.