Effects of operation parameters on performances of stratum ventilation for heating mode

Sheng Zhang, Zhang Lin, Zhengtao Ai, Fenghao Wang, Yong Cheng*, Chao Huan

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Stratum ventilation is more energy-efficient as compared with mixing ventilation for cooling applications. However, due to the short development history of stratum ventilation, few studies on its heating applications are available. The heating operation of stratum ventilation is different from the cooling operation due to the distinct airflow patterns. This study comprehensively investigates the effects of the operation parameters on heating performances of stratum ventilation, using experimentally validated Computational Fluid Dynamics (CFD) simulations. The operation parameters include controllable supply vane angle, supply airflow rate and supply air temperature, and uncontrollable outdoor weather condition. The ventilation performance indices adopt local mean age of air (LMAA), CO2 removal efficiency (CRE), Predicted Mean Vote (PMV), vertical air temperature difference between head and ankle levels (ΔT) and energy utilization coefficient (EUC). By evaluating the individual effects of the operation parameters on the ventilation performances, the relative importance (i.e., relative sensitivity) of the operation parameters for each ventilation performance is identified. By comparing the individual effects and combined effects of the operation parameters on the ventilation performances, it is found that the variations of LMAA, CRE, PMV, ΔT and EUC caused by the combined effects can be accounted by the corresponding most important operation parameters by 86.5%, 85.6%, 78.8%, 65.7% and 70.2% respectively. Moreover, the outdoor weather condition does not significantly affect LMAA, CRE and EUC, but can transfer PMV and ΔT to discomfort level. Lastly, to facilitate heating applications of stratum ventilation, the constant-air-volume system is recommended and a simplified operation strategy is proposed.

Original languageEnglish
JournalBuilding and Environment
Volume148
Pages (from-to)55-66
ISSN0360-1323
DOIs
Publication statusPublished - 2019

Keywords

  • Combined effects
  • Heating
  • Individual effects
  • Operation performances
  • Sensitivity analysis
  • Stratum ventilation

Cite this

Zhang, Sheng ; Lin, Zhang ; Ai, Zhengtao ; Wang, Fenghao ; Cheng, Yong ; Huan, Chao. / Effects of operation parameters on performances of stratum ventilation for heating mode. In: Building and Environment. 2019 ; Vol. 148. pp. 55-66.
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title = "Effects of operation parameters on performances of stratum ventilation for heating mode",
abstract = "Stratum ventilation is more energy-efficient as compared with mixing ventilation for cooling applications. However, due to the short development history of stratum ventilation, few studies on its heating applications are available. The heating operation of stratum ventilation is different from the cooling operation due to the distinct airflow patterns. This study comprehensively investigates the effects of the operation parameters on heating performances of stratum ventilation, using experimentally validated Computational Fluid Dynamics (CFD) simulations. The operation parameters include controllable supply vane angle, supply airflow rate and supply air temperature, and uncontrollable outdoor weather condition. The ventilation performance indices adopt local mean age of air (LMAA), CO2 removal efficiency (CRE), Predicted Mean Vote (PMV), vertical air temperature difference between head and ankle levels (ΔT) and energy utilization coefficient (EUC). By evaluating the individual effects of the operation parameters on the ventilation performances, the relative importance (i.e., relative sensitivity) of the operation parameters for each ventilation performance is identified. By comparing the individual effects and combined effects of the operation parameters on the ventilation performances, it is found that the variations of LMAA, CRE, PMV, ΔT and EUC caused by the combined effects can be accounted by the corresponding most important operation parameters by 86.5{\%}, 85.6{\%}, 78.8{\%}, 65.7{\%} and 70.2{\%} respectively. Moreover, the outdoor weather condition does not significantly affect LMAA, CRE and EUC, but can transfer PMV and ΔT to discomfort level. Lastly, to facilitate heating applications of stratum ventilation, the constant-air-volume system is recommended and a simplified operation strategy is proposed.",
keywords = "Combined effects, Heating, Individual effects, Operation performances, Sensitivity analysis, Stratum ventilation",
author = "Sheng Zhang and Zhang Lin and Zhengtao Ai and Fenghao Wang and Yong Cheng and Chao Huan",
year = "2019",
doi = "10.1016/j.buildenv.2018.11.001",
language = "English",
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pages = "55--66",
journal = "Building and Environment",
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Effects of operation parameters on performances of stratum ventilation for heating mode. / Zhang, Sheng; Lin, Zhang; Ai, Zhengtao; Wang, Fenghao; Cheng, Yong; Huan, Chao.

In: Building and Environment, Vol. 148, 2019, p. 55-66.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effects of operation parameters on performances of stratum ventilation for heating mode

AU - Zhang, Sheng

AU - Lin, Zhang

AU - Ai, Zhengtao

AU - Wang, Fenghao

AU - Cheng, Yong

AU - Huan, Chao

PY - 2019

Y1 - 2019

N2 - Stratum ventilation is more energy-efficient as compared with mixing ventilation for cooling applications. However, due to the short development history of stratum ventilation, few studies on its heating applications are available. The heating operation of stratum ventilation is different from the cooling operation due to the distinct airflow patterns. This study comprehensively investigates the effects of the operation parameters on heating performances of stratum ventilation, using experimentally validated Computational Fluid Dynamics (CFD) simulations. The operation parameters include controllable supply vane angle, supply airflow rate and supply air temperature, and uncontrollable outdoor weather condition. The ventilation performance indices adopt local mean age of air (LMAA), CO2 removal efficiency (CRE), Predicted Mean Vote (PMV), vertical air temperature difference between head and ankle levels (ΔT) and energy utilization coefficient (EUC). By evaluating the individual effects of the operation parameters on the ventilation performances, the relative importance (i.e., relative sensitivity) of the operation parameters for each ventilation performance is identified. By comparing the individual effects and combined effects of the operation parameters on the ventilation performances, it is found that the variations of LMAA, CRE, PMV, ΔT and EUC caused by the combined effects can be accounted by the corresponding most important operation parameters by 86.5%, 85.6%, 78.8%, 65.7% and 70.2% respectively. Moreover, the outdoor weather condition does not significantly affect LMAA, CRE and EUC, but can transfer PMV and ΔT to discomfort level. Lastly, to facilitate heating applications of stratum ventilation, the constant-air-volume system is recommended and a simplified operation strategy is proposed.

AB - Stratum ventilation is more energy-efficient as compared with mixing ventilation for cooling applications. However, due to the short development history of stratum ventilation, few studies on its heating applications are available. The heating operation of stratum ventilation is different from the cooling operation due to the distinct airflow patterns. This study comprehensively investigates the effects of the operation parameters on heating performances of stratum ventilation, using experimentally validated Computational Fluid Dynamics (CFD) simulations. The operation parameters include controllable supply vane angle, supply airflow rate and supply air temperature, and uncontrollable outdoor weather condition. The ventilation performance indices adopt local mean age of air (LMAA), CO2 removal efficiency (CRE), Predicted Mean Vote (PMV), vertical air temperature difference between head and ankle levels (ΔT) and energy utilization coefficient (EUC). By evaluating the individual effects of the operation parameters on the ventilation performances, the relative importance (i.e., relative sensitivity) of the operation parameters for each ventilation performance is identified. By comparing the individual effects and combined effects of the operation parameters on the ventilation performances, it is found that the variations of LMAA, CRE, PMV, ΔT and EUC caused by the combined effects can be accounted by the corresponding most important operation parameters by 86.5%, 85.6%, 78.8%, 65.7% and 70.2% respectively. Moreover, the outdoor weather condition does not significantly affect LMAA, CRE and EUC, but can transfer PMV and ΔT to discomfort level. Lastly, to facilitate heating applications of stratum ventilation, the constant-air-volume system is recommended and a simplified operation strategy is proposed.

KW - Combined effects

KW - Heating

KW - Individual effects

KW - Operation performances

KW - Sensitivity analysis

KW - Stratum ventilation

U2 - 10.1016/j.buildenv.2018.11.001

DO - 10.1016/j.buildenv.2018.11.001

M3 - Journal article

VL - 148

SP - 55

EP - 66

JO - Building and Environment

JF - Building and Environment

SN - 0360-1323

ER -