Numerical Simulation Analysis and Full-Scale Experimental Validation of a Lower Wall-Mounted Solar Chimney with Different Radiation Models

Abstract

As a type of passive architectural structure, wall-mounted solar chimneys enhance the natural ventilation volume of a building’s interior, and maximize reductions in the building’s operational energy consumption. They are indispensable in the building’s energy conservation and emission reduction. Therefore, measuring the wall-mounted solar chimney’s flow characteristics and relevant index parameters is particularly important. This paper uses a combination of full-scale experiments and numerical simulation to conduct a detailed analysis of the wall-mounted solar chimney. Four different radiation models, namely DO (discrete ordinates), S2S (surface-to-surface), MC (Monte Carlo), and Rosseland are used for comparison, and the results of the numerical simulation are compared with the experimental data. The results show that the maximum turbulent viscosity of the fluid predicted by the S2S radiation model is higher than that of the MC and DO models by 16.87% and 8.44%, respectively. The errors of the DO radiation model in the midline and glass cover plate direction concerning the experimental results are only 0.33% and 0.15%, respectively. The mistakes of the MC radiation model in these two directions are 0.51% and 0.47%, respectively. The DO radiation model is more suitable in numerical simulation predictions related to the wall-mounted solar chimney.

Three‐dimensional simulation of green soybean infrared‐assisted spouted bed drying

“…An appropriate radiation model can accurately predict the behavior of a system when thermal radiation is considered. 28 The discrete ordinates (DO) radiation model is a method that solves the radiation transfer equation from a finite number of solid angles, where each solid angle corresponds to a fixed direction in the Cartesian coordinate system. Unlike ray tracing, it transforms the radiation transport equation into the transport equation of radiation intensity in the space coordinate system.…”

Annual Evaluation of Natural Ventilation Induction in Solar Chimneys under Tropical, Dry, and Temperate Climates of Mexico: A Case Study

“…P is the atmospheric pressure in pascals. Equation (20) computes P sv and f as the mole fraction of water vapor.…”

“…In Equation (20), the term RH is the relative humidity. Finally, Equation ( 21) describes the compressibility Z.…”

“…Related works propose different numerical methodologies, experimental evaluations, and parametric studies, particularly evaluating vertical and façade configurations. This way, variants such as rooftype, vertical, and inclined gable-type for single-channel solar chimneys (SC-SoCh) began being investigated [16][17][18][19][20]. Arce et al [21] proposed a double-air-channel solar chimney (TC-SoCh) model through an energy balance study.…”