Phase Change Material Particles and Their Application in Heat Transfer Fluids - Low-cost Nanomaterials: Toward Greener and More Efficient Energy Applications - page 473

Fig. 21 a DSC cyclic curves
of the water in FC-72
nanoemulsion fluids with
different water loadings.
b The measured and
calculated heat capacity
enhancement in the water in
FC-72 nanoemulsion fluids.
The dispersed water droplets
undergo solid-liquid phase
transition [ 44 ]

(a)

(b)

250

Theoretical value
Experimental value

200

150

100

50

0

0 2 4 6 8 10 12 14

Volumetric Fraction of Water (%)

capacity of FC-72 can be enhanced by more than 200 % for a 12 % volume
fraction of water, according to these experimental data. However, a critical issue
for this type of nanoemulsion fluids is the large subcooling, more than 20 C
observed in water in FC-72 nanoemulsion fluids. More work needs to be conducted
in the future to reduce the subcooling of the dispersed PCM nanodroplets.

6 Conclusions

The use of PCMs in thermal fluids has emerged in recent years as a way to enhance
the performance of heat transfer fluids. This chapter discusses several types of
PCM microcapsules and nanoparticles that can be potentially used in application