τis the thermal time constant. Rthermalis the thermal resistance. QABis the heat flow through the material. TABis the temperature difference between the material layers. QARis the heat flow through the thermal capacity. TARis the temperature drop across the thermal capacity. ...
Anti-parity–time symmetry in diffusive systems. Science 364, 170–173 (2019). This paper provides a non-Hermitian Hamiltonian description of heat transfer. Article CAS Google Scholar Cao, P., Li, Y., Peng, Y., Qiu, C.-W. & Zhu, X. High-order exceptional points in diffusive systems...
Raychaudhuri B C 1965 Integrated thermal time constant of building enclosures. Int. J. Heat Mass Transfer 8: 1439–44 View ArticleRaychaudhuri, B C, Transient Thermal Response of Enclo- sures: The Integrated Thermal Time-Constant. Int. J. Heat Mass Transfer, Vol 8, pp 1439-1449, 1965...
Thermal conductivity refers to the ability of a material to transfer heat, which is determined by the amount of heat that can be transferred by the material. It can be calculated by measuring the heat flux density per unit degree of temperature difference using Fourier's law. Thermal conductivit...
We then experimentally demonstrate reciprocal heat transfer in a time-modulated device. Our findings correct previous misconceptions regarding reciprocity breaking for thermal diffusion, revealing the generality of symmetry constraints in heat transfer, and clarifying its differences from other transport ...
Experimental study was carried out in discontinuous operation in 2 hours operation with constant interval of off-time. As a result, the heat exchange rate in the short-time period of operation in discontinuous operation increases of 53.1 % for double-tube, 33.3 % for U-tube, and 29.1 % for...
In case of thermal transfer impedances, both positive and negative values may be present in the R(τ) thermal time-constant spectra while driving point thermal impedances are represented by only positive values in the R(τ) functions. For details on thermal time-constant spectra refer to Append...
In order to solve the general problem of radiation heat transfer between grey, diffuse, isothermal surfaces, we must define two new concepts, the radiosity J and irradiation G. The radiosity J is defined as the total radiation which leaves a surface per unit area per unit time, and the ...
Both factors have a significant impact on the total heat capacity and, therefore, on the transient thermal behavior. Additionally, the assumption of a constant heat transfer coefficient is a simplification, as it is a nonlinear function of temperature in reality. Furthermore, the components were ...
The time constant, τ, of the system is obtained from the heat removal capacity and the heat storage capacity, mcp (where m is the mass and cp the coefficient of specific thermal capacity). It is a material/design property of the system. A large time constant is desirable in universal ma...