A novel approach of integrating ventilation and air cleaning for sustainable and healthy office environments

Han, Kwanghoon; Zhang, Jensen S.; Guo, Bing

doi:10.1016/j.enbuild.2014.02.055

Cited by 29 publications

(7 citation statements)

References 32 publications

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“…These results are attributed to ACH values and total VOC emission strengths in the surveyed apartments, which are two important parameters for IAQ (Deng et al, 2012). The lowest ACH value, which reflects low ventilation conditions (Chen et al, 2014;Han et al, 2014;Rackes and Waring, 2013), was obtained from the apartment 7, with a value of 0.37. Although data are not presented in this paper, the apartment sizes were all comparable each other and the ceilings of all apartments were covered with paper-containing finishing materials.…”

Section: Temporal Characteristics Of Selected Vocsmentioning

confidence: 99%

Temporal Characteristics of Selected Volatile Organic Compounds in Urban High-Stories Urban Apartments

Shin¹,

Kim²,

Jo³

2015

Journal of Environmental Science International

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In present study, the temporal characteristics of nine selected volatile organic compounds (VOCs), including four alcohol, 2 aldehyde, and 3 ketone compounds, in high-stories urban apartments over a 2-y period were investigated. The indoor VOC concentrations had generally a decreasing trend over the 2-y follow-up period. For examples, the 2E1H indoor concentration decreased from 10.8 ㎍/m 3 for the first two months to 5.1 ㎍/m 3 for the last two months. In addition, the DCA and ACT indoor concentrations decreased from 5.0 and 14 ㎍/m 3 for the first two months to 2.2 and 6.4 ㎍/m 3 , respectively, for the last two months. The indoor-to outdoor concentration ratios over the 2-y period were much greater than 1, indicating that indoor VOC concentrations were higher than the outdoor VOC concentrations. Similar to those of the individual VOCs, the indoorto-outdoor concentration ratios of all three VOC groups were higher than 1 over the 2-y follow-up period, suggesting higher indoor concentrations of the three VOC groups than outdoor concentrations. In consistence with the results of VOC indoor concentrations, the VOC emission rates decreased gradually as time passed, due to the decreased VOC emission strengths of indoor sources. Finally, there was an initial sharp decrease in the indoor VOC concentrations followed by a slower decrease, indicating a multi-exponential decay model for the target VOCs, which was demonstrated by comparison of the residuals and the adjusted coefficient of determination associated with the one and two-exponential fits of each data set.

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Section: Temporal Characteristics Of Selected Vocsmentioning

confidence: 99%

Temporal Characteristics of Selected Volatile Organic Compounds in Urban High-Stories Urban Apartments

Shin¹,

Kim²,

Jo³

2015

Journal of Environmental Science International

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“…It targeted pollutants emitted from indoors and filtration control was only used as a means of reducing the ventilation rate to save heating, cooling, and ventilation energy. Han et al [26] developed a dynamic integration strategy between ventilation and air filtration to reduce energy consumption, keeping indoor HCHO below the standard level. The integration strategy would provide satisfactory IAQ and also could bring 11% annual energy savings for the case building.…”

Section: Introductionmentioning

confidence: 99%

“…The developed system adopted a simple strategy, i.e., a ventilation mode that operates when outdoor PM concentration is below a certain concentration and a filtration mode that operates when it exceeds a certain concentration. In the studies of Han [26] and Bae [16], the control of ventilation and filtration modes was quite simple because the source of the pollutants of interest was assumed to be outdoors.…”

Section: Introductionmentioning

confidence: 99%

Ventilation and Filtration Control Strategy Considering PM2.5, IAQ, and System Energy

Kim¹,

Kim

Yeo

2020

Atmosphere

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Ventilation or filtration control is widely applied to improve indoor particle matter (PM) concentration. Adjusting the ventilation rates to control indoor PM levels can affect the concentration of other indoor pollutants and energy costs, and increasing the filtration flow rate can lower the indoor PM concentration, but also increase the fan energy consumption. In this study, we developed a ventilation and filtration control strategy to determine the optimal control mode and flow rate of the system to meet indoor PM (especially PM2.5) concentration, ensure adequate indoor air quality (IAQ), and minimize fan energy consumption. First, a dynamic model to estimate the indoor PM2.5 generation rate was developed based on the mass balance model and then verified by experiments. Next, the control limit (CL) curve was developed on the basis of the indoor PM2.5 characteristics depending on ventilation and filtration control during various indoor and outdoor PM2.5 conditions (indoor PM2.5 generation rate and outdoor PM2.5 concentration). In addition, an algorithm was proposed to determine the optimal control mode and flow rate of the system. Condition zone control can keep indoor PM2.5 below or as close to the desired target concentration as possible, maintain IAQ within acceptable ranges, and save about 15~70% of fan energy compared with the conventional rule-based control under the case condition.

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“…Hence, it is clear that a decrease in the airflow rate causes a decrease in IEQ; thus, it is required to set a threshold on IEQ level, so as to control the minimum airflow rate accordingly. Precisely, the approach should focus on setting the pollutants concentration instead of setting the airflow rate in order to ensure acceptable energy performance as well as IEQ level [44]. By doing this, the airflow rate should then be evaluated based on the actual occupancy rate in the indoor environment [45][46][47].…”

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confidence: 99%

Indoor Environmental Quality Analysis for Optimizing Energy Consumptions Varying Air Ventilation Rates

et al. 2020

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The energy refurbishment of the existing building heritage is one of the pillars of Italian energy policy. Aiming for energy efficiency and energy saving in end uses, there are wide and diversified improvement strategies, which include interventions on the building envelope and Heating, Ventilation, and Air Conditioning (HVAC) systems, with the introduction of renewable energy sources. The research aims at evaluating the building energy consumptions and Indoor Environmental Quality (IEQ), varying the airflow rates handled by the HVAC system. A Case Study (the Aula Magna of a university building) is analysed; an in-situ monitoring campaign was carried out to evaluate the trend of some environmental parameters that are considered to be significant when varying the external airflow rates handled by the HVAC system. Additionally, dynamic simulations were carried out, with the aim of evaluating the energy savings coming from the airflow rates reduction. The results of this case study highlight the opportunity to achieve significant energy savings, with only slight variations in IEQ; a 50% reduction in airflow rate would decrease energy consumption by up to 45.2%, while increasing the carbon dioxide concentration from 545 ppm to 655 ppm, while the Particulate Matter and Total Volatile Organic Compounds increase is insignificant.

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A novel approach of integrating ventilation and air cleaning for sustainable and healthy office environments

Cited by 29 publications

References 32 publications

Temporal Characteristics of Selected Volatile Organic Compounds in Urban High-Stories Urban Apartments

Temporal Characteristics of Selected Volatile Organic Compounds in Urban High-Stories Urban Apartments

Ventilation and Filtration Control Strategy Considering PM2.5, IAQ, and System Energy

Indoor Environmental Quality Analysis for Optimizing Energy Consumptions Varying Air Ventilation Rates

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