From the heat transfer point of view, the important criterion is the type of phase transition: A list of general requirements is presented in Table 1.Ĭlassification of PCMs has been periodically reviewed in studies such as Pielichowska, and Pielichowski and it will not be covered here. In order to assess its potential as thermal energy storage medium, a PCM candidate must comply with general and application-specific requirements. LHS minimizes the volume required for the TES and more importantly, the (almost) constant phase change temperature, dampens the system temperature fluctuations to a significantly higher extent compared to sensible storage. To optimize the system design, latent heat storage using phase change materials is preferred over sensible heat storage, due to a considerably higher storage capacity over a narrow temperature variation interval. Thermal energy storage is a critical component in systems where the availability of the energy sources fluctuates, such as solar energy or in thermal systems with periodic operation, such as electronic cooling.

Research gaps were discussed and future research directions were suggested, such as hybrid passive – active techniques. The active techniques discussed in this review are electric field, magnetic field and ultrasounds.

Active techniques for heat transfer enhancement in PCMs are scarce in the literature. A significant number of research articles was found on the topic of combining two or more techniques. The main passive techniques families included in this review were inserts, nanoparticles, heat pipes and packed-bed PCMs. Heat transfer enhancement techniques system integration and optimization was addressed in the relevant context. The heat transfer techniques analyzed and included in the review were critically examined and discussed (1) from the heat transfer enhancement point of view and (2) from the alteration of the heat storage capacity point of view. This review paper collects recent and relevant research articles on the topic of heat transfer enhancement in phase change materials heat storage systems, covering both passive techniques as well as active techniques.

Cs 1.6 best aim cfg