An analysis has been performed to study the problem of the Thermal performance of a continuously moving convective-radiative rod with variable Thermal conductivity. Highly accurate semi-analytical methods called the least Square method (LSM) and the Galerkin method (GM) are introduced and then used to obtain a nonlinear temperature distribution equation in a fin that allows for more accurate measurements that could make the investigation stand out. This research investigated the influence of various parameters on heat transfer in a continuously moving convective-radiative rod. The parameters examined include the convective-conductive factor (Ncc), dimensionless Thermal conductivity coefficients (a), radiative-conductive parameter (Nrc), Peclet number (Pe), dimensionless convective (θc), and radiative sink temperatures (θr). An increase in the dimensionless Thermal conductivity coefficient (a) led to higher dimensionless temperatures within the rod, indicating an amplification of conductive heat transfer. The convective-conductive parameter (Ncc) demonstrated a direct relationship with heat loss. In contrast, the radiative-conductive parameter (Nrc) exhibited an inverse relationship between radiative heat transfer and local temperature within the fin. A rise in the Peclet number was associated with higher dimensionless temperatures, indicating a faster-moving rod. Additionally, variations in dimensionless convective and radiative sink temperatures affected temperature profiles, with higher sink temperatures resulting in increased dimensionless temperatures. Notably, the dimensionless radiative sink temperature was found to have a more significant impact on overall dimensionless temperature than the convective sink temperature. These findings underscore the intricate interplay of factors governing heat transfer and temperature distribution in the moving rod system. The importance of this work lies in its comprehensive analysis of the intricate interplay of parameters affecting heat transfer and temperature distribution in continuously moving convective-radiative rods, providing valuable insights for optimizing industrial processes and engineering applications.

Increasing rate of energy consumption in building sector has led the constructors towards the low-energy consuming methods. The enhancement of Thermal performance of structural elements in conjunction with mechanical properties yields to the decrease in environmental impacts. In this paper, Thermal performance of ASTM mortars has been investigated. Considering the limitations of typical methods in the measurement of Thermal parameters, in this investigation, the parameters of lag time, decrement factor and Thermal conductivity of mortars have been measured using the method of hygroThermal chamber. Results show that type O mortar with the minimum Thermal conductivity of 0. 264 (watt per kelvin-meter) and the maximum lag time of 66 minutes, had the significant thermo-buffering capacity among the ASTM mortars. However, due to the low cementitious materials in the mixture of the mortar, type O lacks of the acceptable strength features. Consequently, the optimum type of mortar must be produced in which the Thermal performance has the same value of the mechanical properties. KEYWORDS Mortars, Masonry structures, energy consumption, Thermal performance, ASTM standard.

Thermal energy storage is among the highly efficient approaches to overcome the energy crisis. Using phase change material (PCM) is one of the most effective techniques in Thermal energy storage applications. Several types of PCM with distinct characteristics and different ranges of melting and solidification temperature have found their way in various industries. However, commercialized PCMs generally suffer from low Thermal conductivity which limits their application. In this study, the effect of adding different weight percentages of various nanoparticles, such as CuO, TiO2, Al2O3 and graphene to paraffin, as a standard PCM, on the improvement of the Thermal properties of PCM was investigated. Thermophysical properties and morphology of the nanocomposites, such as phase change temperature and latent heat of melting were characterized by Differential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM), and Fourier Transform Infrared Spectroscopy (FT-IR). SEM images display the proper distribution of nanoparticles in phase change material. FTIR results verified the formation of nanocomposites. A comparison between the investigated PCM nanocomposites showed that the nanocomposites containing 2 wt. % TiO2 with the enthalpy of 179. 88 J/g, and 1 wt. % graphene nanocomposite with the enthalpy of 120. 38 J/g had the highest and lowest energy storage capacity compared to paraffin, respectively. The results indicated that Nano-enhanced phase change materials (NEPCMs) could be particularly useful in applications in which temperature control is crucial. The new types of nanocomposites used in this study showed remarkable Thermal performance, and they are capable of being used in Thermal management applications. © 2020 Journal of Energy Management and Technology.