Abstract
We present the results of simulation of conjugate heat transfer between the grid of barium titanate plates and the hot air flow. The air temperature undergoes rapid change and the thermal front propagation and heat exchange with the solid plates have been studied for several plate configurations. The results show that the air heat could be effectively absorbed by the plates during the time of thermal front propagation, making such configuration attractive for pyroelectric energy harvesting applications.
Highlights
The problem of conjugate heat transfer, when a solid is heated or cooled by the flow of gas or liquid has many practical applications, from environmental flows to engineering devices and power plants
In the present paper we concentrate on the numerical estimate of effective parameters of barium titanate (BaTiO3) grid being heated by a hot air flow
As a result it can be seen that choosing the spacing of 0.375 mm leads to the transfer of major part of air thermal energy to the plates during the hot temperature front propagation which makes this setup promising for thermal energy harvesting
Summary
The problem of conjugate heat transfer, when a solid is heated or cooled by the flow of gas or liquid has many practical applications, from environmental flows to engineering devices and power plants. The pyroelectric effect is the change in electrical polarization of material with temperature It can be used for generation of electric current and producing some electric power. For efficient power generation by this process the rapid change in temperature of the material is required. In practice this can be achieved by passing a volume of hot air through the grid of colder pyroelectric material [3]. In the present paper we concentrate on the numerical estimate of effective parameters of barium titanate (BaTiO3) grid being heated by a hot air flow. The grid spacing and plate thickness were varied in numerical simulations to find out the best parameters for the fastest and fullest heat absorption from the air
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