Multi-scale modeling and thermal transfer properties of electric heating fabrics system

Abstract

Purpose The purpose of this paper is to investigate the thermal transfer properties of electric heating fabric system which contains heating units or conductive yarns by numerical simulation, in order to optimize and evaluate the thermal performance of heating clothing. Design/methodology/approach Two kinds of FEM models are created by ANSYS system: macro-scale models of the fabrics system with heating units and air layer; and meso-scale models of the plain-woven fabrics were established embedded with the stainless yarns. In the macro-scale model, the interior and surface temperature field distribution were simulated and analyzed based on different heating unit size, heating power, heating region, air layer thickness and ambient temperature. For meso-scale models, the effects of the conductive yarns temperature, covering fabrics and pore-filling material on the temperature field distribution were simulated and analyzed. Findings With the increasing of the air layer thickness or the effective conductivity, the heat transfer along the direction of fabric thickness decreases gradually. The heat transfer along the fabric plane can be increased by dispersing the heating region. With the increasing of the conductive yarns’ temperature or the covering fabrics’ conductivity, the heat transfer distance along the fabric warp direction can be increased. Filling the internal pores of the fabric with 10 wt% SiC/TPU hybrid materials can effectively increase the in-plane heat transfer and improve the temperature uniformity on the surface of heated fabrics. Originality/value The finite element method was used to establish the simulation models of the heating fabric systems. The influence of several parameters on the thermal performance was analyzed and discussed, as well as the internal and external temperature distribution in the macro and micro scales models.

Thermophysical Characterization of Materials for Energy-Efficient Double Diaphragm Preforming

“…To avoid this issue, infrared thermal mapping without binders is also employed to evaluate the heat transfer properties of woven and non-woven carbon fabrics [22]. Apart from carbon fabric studies, other material investigations include woven ceramic composites under compression (experimental and numerical) [23], aramid fabrics [24] , unit 3D textile structure [25], numerical particle embedded textile [26] and other numerical techniques [27][28][29][30].…”

Numerical simulation and experiment verified for heat transfer processes of high-property inorganic fiber woven fabrics

“…Basalt fiber has the highest density of about 2.422 g/cm 3 . This is because basalt fiber is mainly composed of inorganic oxides, including not only SiO 2 , but also Al 2 O 3 , CaO, MgO, FeO, Fe 2 O 3 and so on.…”

“…The heat transfer analysis of fabric has important significance for the thermal comfort of fabric, 1 the thermal insulation properties of protective fabric 2 and the thermal properties of other fabric composite material. [3][4][5][6][7] However, the interlaced structure inside the fabric makes it difficult to analyze the heat transfer of the fabric. To solve this problem, numerical simulation is a very convenient and accurate method.…”

Modeling and influence on effective thermal conductivity of woven fabrics based on structure parameters

“…Some researchers (Kashif et al. , 2015; Yang et al. , 2019; Siddiqui and Sun, 2013) constructed three dimensional simulation models using finite element software to investigate the thermal transfer mechanism of fabrics based on microscale yarns geometrical structure or even to analysis the fabric's thermal properties with microencapsulated phase change materials.…”

“…And yet, in Wei Ju's and Bhattacharjee's model, less consideration is given to the series and parallel mixing characteristics of yarn and surrounding air and the possibility when the air layer around yarn is squeezed. Some researchers (Kashif et al, 2015;Yang et al, 2019;Siddiqui and Sun, 2013) constructed three dimensional simulation models using finite element software to investigate the thermal transfer mechanism of fabrics based on microscale yarns geometrical structure or even to analysis the fabric's thermal properties with microencapsulated phase change materials. The result of simulation after postprocessing has been validated against experimental result.…”