Using nanoparticles in phase change materials (PCM) Improves thermal conductivity. Increased thermal conductivity allows for a faster rate of heat transfer in PCM, reducing the time required for the PCM to undergo a complete charge or discharge. On the other hand, to improve the thermal performance of PCMs, the discharge time should be increased.
I believe higher values of thermal conductivity pf PCM is always favorable. If a system needs more time for discharging, more PCM can be solution not a PCM with low thermal conductivity
Dear Dr.Ramin
I think the opposite is because the discharge time will be reduced.
Best regards
Nanoencapsulation of PCM allows tuning the thermal conductivity of a PCM-containing material independent from that of the actual PCM by choosing a matrix either with high thermal conductivity (usually preferrable) or with low thermal conductivity (slowing down chatging anderen discharging of the PCM). If longer charging anderen discharging times are intended, usually increasing the PCM quantity in a matrix with high thermal conductivity ist what you want to do in order to have a high thermal buffering capacity with a short response time.
Dear Nikolaus
This means the enhancement of a thermal capacity affects the discharge time.
Thanks for answering
Best regards
In my understanding, some polymer nanoparticles can decrease thermal conductivity of phase change materials and enhance the protection in the stationary regime. In fact they do not affect the latent heat and even improve the phase change behavior as well as the mechanical properties.
Best regards.
Dear Mounir
Thanks for answering
Most nanoparticles increase thermal conductivity. I'm looking forward to any published research can be provided about reduce the thermal conductivity of phase-change materials using nanoparticles.
Best regards.
You can always vary the loading of nanoparticles to vary the thermal conductivity. Similarly, microcapsule with various nanoparticle inclusion can be utilized to vary the thermal conductivity. Remember, the increasing thermal conductivity of organic PCM is difficult and the reverse is easy. Discharge time increase will increase the response time too. Always a compromise has to be done.
Increase in thermal conductivity reduces Prandtl and Nusselt Number.
This has the effect of increasing the film heat transfer coefficient.
My apologies if that seems trite.
I'm unsure of the effect in change of state processes.
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