Cooling energy simulation and analysis of an intermittent ventilation strategy under different climates

Kabanshi, Alan; Ameen, Arman; Hayati, Abolfazl; Yang, Bin

doi:10.1016/j.energy.2018.05.093

Cited by 23 publications

(13 citation statements)

References 33 publications

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“…Generally, IAJS has potential to offer an ambient temperature offset up to 2.5 ºC with an operational velocity of 0.4 m/s (using higher velocities increases the temperature offset), which is equivalent to 13% cooling demand reduction compared with MV. Cooling energy simulation and analysis under different climates demonstrate its feasibility and potential energy benefits (Kabanshi et al, 2018). IAJS as a primarysystem has potential application in climates where cooling is needed for most parts of the year as intermittent airflow, even at minimal operational velocity 0.4 m/s, was found undesirable below 23.7 ºC (Kabanshi et al, 2019).…”

Section: Periodic Variation Of the Ventilation Flowrate With A Sinementioning

confidence: 95%

A review of advanced air distribution methods - theory, practice, limitations and solutions

Yang

Melikov

Kabanshi

et al. 2019

Energy and Buildings

181

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Ventilation and air distribution methods are important for indoor thermal environments and air quality. Effective distribution of airflow for indoor built environments with the aim of simultaneously offsetting thermal and ventilation loads in an energy efficient manner has been the research focus in the past several decades. Based on airflow characteristics, ventilation methods can be categorized as fully mixed or non-uniform. Non-uniform methods can be further divided into piston, stratified and task zone ventilation. In this paper, the theory, performance, practical applications, limitations and solutions pertaining to ventilation and air distribution methods are critically reviewed. Since many ventilation methods are buoyancy driving that confines their use for heating mode, some methods suitable for heating are discussed. Furthermore, measuring and evaluating methods for ventilation and air distribution are also discussed to give a comprehensive framework of the review.

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Section: Periodic Variation Of the Ventilation Flowrate With A Sinementioning

confidence: 95%

A review of advanced air distribution methods - theory, practice, limitations and solutions

Yang

Melikov

Kabanshi

et al. 2019

Energy and Buildings

181

View full text Add to dashboard Cite

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“…Most building energy design has assumed that all rooms are occupied during operational hours to estimate maximum energy loads [14][15][16][17]. However, building occupancy rarely reaches the maximum load and always varies throughout the day in real life.…”

Section: Introductionmentioning

confidence: 99%

Examining the Relationships between Stationary Occupancy and Building Energy Loads in US Educational Buildings–Case Study

2020

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Building energy systems are designed to handle both permanent and temporary occupants. Permanent occupants are considered the base energy load while temporary occupants are considered a temporary or additional load. Temporary occupancy is potentially the most difficult to design as the number of temporary occupants varies more significantly than permanent occupants. This case study was designed to investigate the effect of occupancy on energy loads, i.e. the relationship between occupancy and building energy loads. This study estimated the building occupancy by using existing network infrastructure, such as Wi-Fi and wired Ethernet based on the assumption that the number of Wi-Fi connections and the wired Ethernet traffic were used as a proxy for total and stationary occupancy. The relationships were then examined using correlations and regression analyses. The results showed the following: 1. Stationary occupancy was successfully estimated using the network infrastructure; 2. There was a linear relationship between electricity use and total occupancy (and, thus, the use of network infrastructure); 3. Permanent occupants generated a higher impact on the electricity load than the temporary occupants; 4. There was a logarithmic relationship between electricity use and the Ethernet data traffic (a proxy of permanent occupants); and 5. The statistical and qualitative analyses indicated that there was no significant relationship between occupancy and thermal loads, such as cooling and heating loads.

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“…Based on their measurements they concluded that the system provided a more comfortable indoor thermal environment at elevated temperatures than was the case when conventional mixing and displacement ventilation systems were used. Kabanshi et al 9 also studied the effect of an IAJS, in which the supply provided air to the room with intermittent velocities between 0.4 m/s and 0.8 m/s, on cooling energy demand in different climates. Their results showed that the cooling energy demand could be significantly reduced by application of IAJS in hot and humid climates, while in hot and dry climates considerable energy savings could be achieved as well.…”

Section: Introductionmentioning

confidence: 99%

“…Kabanshi et al. 9 also studied the effect of an IAJS, in which the supply provided air to the room with intermittent velocities between 0.4 m/s and 0.8 m/s, on cooling energy demand in different climates. Their results showed that the cooling energy demand could be significantly reduced by application of IAJS in hot and humid climates, while in hot and dry climates considerable energy savings could be achieved as well.…”

Section: Introductionmentioning

confidence: 99%

Mixing ventilation driven by two oppositely located supply jets with a time-periodic supply velocity: A numerical analysis using computational fluid dynamics

Hooff

Blocken

2019

Indoor and Built Environment

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Ventilation is of primary importance for the creation of healthy and comfortable indoor environments and it has a significant impact on the building energy heating and cooling demand. The aim of this study is to assess the application of time-periodic supply velocities to enhance mixing in mixing ventilation cases to reduce heating and cooling energy demands. This paper presents computational fluid dynamics (CFD) simulations of a generic mixing ventilation case, in which the time-averaged velocities and pollutant concentrations from a reference case with constant supply velocities were compared with those obtained from a case with time-periodic supply velocities (sine function). The unsteady Reynolds-averaged Navier-Stokes (URANS) CFD simulations indicate that the use of time-periodic supply velocities can reduce high pollutant concentrations in stagnant regions, reduces the overall time-averaged pollutant concentrations and increases contaminant removal effectiveness with about 20%. The influence of the period of the sine function was assessed and the results showed that for the periods tested, the differences are negligible. Finally, the URANS approach was compared with the large eddy simulations (LES) approach, indicating that URANS leads to very similar results (NMSE < 3.2%) as LES and can thus be regarded as a suitable approach for this study.

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Cooling energy simulation and analysis of an intermittent ventilation strategy under different climates

Abstract: This is the accepted version of a paper published in Energy. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.

Cited by 23 publications

References 33 publications

A review of advanced air distribution methods - theory, practice, limitations and solutions

A review of advanced air distribution methods - theory, practice, limitations and solutions

Examining the Relationships between Stationary Occupancy and Building Energy Loads in US Educational Buildings–Case Study

Mixing ventilation driven by two oppositely located supply jets with a time-periodic supply velocity: A numerical analysis using computational fluid dynamics

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