Multi-criteria Performance Dynamic Optimization for Heating Operation of Stratum Ventilation Considering Different Metabolic Rates

Bai, Yan; Wang, Tingxiang; Wan, Taocheng

doi:10.1007/s13369-022-07119-3

Cited by 3 publications

(2 citation statements)

References 60 publications

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“…Based on CFD simulation results, the objective functions of the PMV, the LMAA, the ∆T and the Q s (Equations ( 18)-( 21)) are determined by RSM method. Moreover, the normalized design parameters (Equation ( 22)) are beneficial to develop for the calculation of these RSM models [54], because normalization helps to eliminate differences caused by different input scales and units [55].…”

Section: Combinatorial Optimization Modelingmentioning

confidence: 99%

A Combinatorial Optimization Strategy for Performance Improvement of Stratum Ventilation Considering Outdoor Weather Changes and Metabolic Rate Differences: Energy Consumption and Sensitivity Analysis

Bai

Wei

2023

Sustainability

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Since occupants spend most of their time indoors, an energy-saving and comfortable indoor environment are particularly important. The differences in the metabolic rate of occupants make them have different requirements for their thermal environment. To save energy under the comprehensive needs of occupants for thermal environment, the combinatorial optimization strategy based on NSGA-II and improved the TOPSIS method is proposed in this study. Firstly, the physical model of the CFD simulation is verified by experiments. Secondly, the specific operation cases corresponding to combinations of different levels of factors are determined via the RSM method, and the ventilation performance prediction model considering the metabolic rate differences and outdoor weather changes is established. Thirdly, supply air velocities and temperatures are optimized by using Pareto-based NSGA-II; the Pareto optimal solution set under different outdoor temperatures is obtained. Finally, based on the Pareto optimal solutions at different outdoor temperatures, the optimal strategy under dynamic outdoor air temperature is obtained by improved TOPSIS by the CRITIC method. The optimization of ventilation parameters significantly improved the ventilation performance, and the results show that the predicted mean vote, energy consumption, vertical air temperature difference between head and ankle levels and the local mean age of air for different metabolic rates decrease by 64.1%, 4.74%, 24.83% and 7.39% on average, respectively. Moreover, the relative energy saving rate increases as the metabolic rate increases, and the strategy facilitates adaptation to outdoor weather changes and meets the individual needs of occupants for the indoor environment. This has important implications for achieving the global goal of energy efficiency and emission reduction.

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Section: Combinatorial Optimization Modelingmentioning

confidence: 99%

A Combinatorial Optimization Strategy for Performance Improvement of Stratum Ventilation Considering Outdoor Weather Changes and Metabolic Rate Differences: Energy Consumption and Sensitivity Analysis

Bai

Wei

2023

Sustainability

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“…Stratum ventilation (SV) is a new technology that requires vents to be placed in areas where people are active to effectively dilute pollutants [ 23 , 24 ] while reducing the supply of fresh air to unoccupied areas to save energy [ 25 , 26 ]. Current research on the application of SV has focused on large spaces such as offices and has yielded some design parameters and operational guidelines [ 27 , 28 , 29 ]. However, in subway cars, passengers exhale pollutants at different heights in a confined space, and there is a cross-transmission risk of pollutants along the various height levels.…”

Section: Introductionmentioning

confidence: 99%

Stratum Ventilation: Enabling Simultaneous Energy Conservation and Air Purification in Subway Cars

Mao

Wang

Liang

et al. 2022

IJERPH

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The supply of fresh air for underground rail transit systems is not as simple as opening windows, which is a conventional ventilation (CV) measure adopted in aboveground vehicles. This study aims to improve contaminant dilution and air purification in subway car ventilation systems and the safety of rail transit post-coronavirus disease pandemic era. We designed an air conditioning (AC) terminal system combined with stratum ventilation (SV) to enable energy consumption reduction for subway cars. We experimentally tested the effectiveness of a turbulence model to investigate ventilation in subway cars. Further, we compared the velocity fields of CV and SV in subway cars to understand the differences in their airflow organizations and contaminant removal efficiencies, along with the energy savings of four ventilation scenarios, based on the calculations carried out using computational fluid dynamics. At a ventilation flow rate of 7200 m3/h, the CO2 concentration and temperature in the breathing areas of seated passengers were better in the SV than in the CV at a rate of 8500 m3/h. Additionally, the energy-saving rate of SV with AC cooling was 14.05%. The study provides new ideas for reducing the energy consumption of rail transit and broadens indoor application scenarios of SV technology.

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Dynamic energy optimization strategy to provide appropriate thermal comfort and fresh air under occupants’ different activity types

Shen,

Bai

2024

Energy and Buildings

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Multi-criteria Performance Dynamic Optimization for Heating Operation of Stratum Ventilation Considering Different Metabolic Rates

Cited by 3 publications

References 60 publications

A Combinatorial Optimization Strategy for Performance Improvement of Stratum Ventilation Considering Outdoor Weather Changes and Metabolic Rate Differences: Energy Consumption and Sensitivity Analysis

A Combinatorial Optimization Strategy for Performance Improvement of Stratum Ventilation Considering Outdoor Weather Changes and Metabolic Rate Differences: Energy Consumption and Sensitivity Analysis

Stratum Ventilation: Enabling Simultaneous Energy Conservation and Air Purification in Subway Cars

Dynamic energy optimization strategy to provide appropriate thermal comfort and fresh air under occupants’ different activity types

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