This research developed an intelligent ensemble machine learning prediction model for the thermal comfort of passengers inside compartment subway. Data sources used data-driven modelling were obtained from on-site measurements and passengers’ questionnaires in compartments Nanjing The four models established using methodologies Logistic Regression (LR), Random Forest (RF), Support Vector Machine (SVM) Decision Tree (DT) learning, respectively. performance RF method was compared with DT, LR...

The thermal comfort of passengers in the carriage cannot be ignored.Thus, this research aims to establish a prediction model for internal environment subway car and find optimal input combination establishing predicted mean vote (PMV) index.Data-driven modeling utilizes data from experiments questionnaires conducted Nanjing Metro.Support vector machine (SVM), decision tree (DT), random forest (RF), logistic regression (LR) were used build four models.This select most appropriate variables...

Supercritical CO2 is widely used in the HVAC facilities, such as gas coolers and solar collectors. The collector a fluid-filled cavity, heat mass transfer characteristics cavity key factor that affects performance of collector. Considering thermophysical properties supercritical change dramatically, this article employs Lattice Boltzmann Method (LBM) to implement numerical simulation transfer. Based on analysis simulate results, it found mainly related Rayleigh number. Consequently, several...

Purpose This study aims to show the importance of natural convection supercritical fluid in an inclined cavity. The heat transfer performance can be improved. Design/methodology/approach A model cavity was set up simulate fluid. influence angles (30 approximately 90°) and pressures (8 12 MPa) are analyzed. To ascertain flow convection, this paper conducts a numerical investigation using lattice Boltzmann method (LBM), which is proven precise convenient. Findings results that higher obtained...

This paper aims at performing an investigation numerically on the turbulent flow and thermal performances for asymmetrical concave surface integrated with a slim vibrating piezoelectric fan. The dynamic mesh technique using user defined function to describe displacement of cantilever beam is employed model deformation fan in time. Meanwhile, SST k-ω turbulence chosen capture behavior heat transfer. Two important factors, relative curvature both sides semicircular surfaces ( RK) dimensionless...

In this paper, the thermal performance of corrugated surfaces cooled with a piezoelectric fan was studied. A total 25 different wave shapes have been tested under Re and gap heights ( G). The results showed that only surface A/ W PF 0.167 T/ 0.533 produces highest Nu area values for all conditions, which is approximately 50% higher than flat surface. It confirmed shape not conducive to promoting development vortex structure but also beneficial increase effective heat transfer so overall...

Two sets of supplementary experiments have been performed to be able predict the convective diffusion heat/mass transfer rates a cylindrical target whose height and diameter are comparable to, but less than, circular cross-stream jet, thereby simulating same geometric configuration as typical burner rig test specimen located in cross stream combustor exit nozzle. The first set exploits naphthalene sublimation technique determine coefficient under isothermal conditions for various flow...

One of the main factors affecting heat transfer efficiency solar collector is that ordinary fluid in it state natural convection. Supercritical expected to improve collectors due its dramatic changes thermal properties, so necessary carry out research convection supercritical fluid. Although researchers have made lots related experimental investigations, mechanism still unclear. In order clarify mechanism, this article conducts a numerical analysis for applying lattice Boltzmann method,...

The application of a recently formulated vapor transport theory to predict deposition rates corrosive salts from alkali-seeded combustion gases small-capacity, high-velocity, atmospheric-pressure burner rig was hampered by the relatively large dimensions cylindrical deposit collector compared diameter gas stream. relative led highly nonadiabatic flow around and necessitated two series experiments. In first series, mass transfer coefficients were determined utilizing naphthalene sublimation...