Impact of impinging jet ventilation on thermal comfort and indoor air quality in office buildings

Staveckis, Arturs; Borodiņecs, Anatolijs

doi:10.1016/j.enbuild.2021.110738

Cited by 57 publications

(22 citation statements)

References 15 publications

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“…IJV system not only consumed less energy consumption than MV, but also overcame the disadvantage that DV was not applicable for heating in winter [ 37 , 38 ]. This was because IJV had a large supply momentum, which could prevent the hot air flow from rising too fast due to buoyancy and maintain hot air stay for a long time in the personnel area [ 60 ]. IJV could provide excellent IAQ and virus spread control ability as it could offer smaller particle concentration and mean age of air (MAA) [ 59 ].…”

Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

“…The air age and CO 2 concentration decreased with the height increase of air outlet, and the result reached the standard requirement at about 1.2 m [ 35 ]. In addition, the shape and number of air outlets could be optimized to provide better results in pollutant removal and air exchange efficiency [ 60 ]. By increasing ceiling exhausts, the MAA could be reduced by up to 54%, the residence time of indoor air was shortened and the inhaled air quality by occupants was better.…”

Section: Impacts On Thermal Comfort Air Quality and Virus Spread Controlmentioning

confidence: 99%

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A review of different ventilation modes on thermal comfort, air quality and virus spread control

Fan

Wang

et al. 2022

Building and Environment

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In the era of Corona Virus Disease 2019 (COVID-19), inappropriate indoor ventilation may turn out to be the culprit of microbial contamination in enclosed spaces and deteriorate the environment. To collaboratively improve the thermal comfort, air quality and virus spread control effect, it was essential to have an overall understanding of different ventilation modes. Hence, this study reviewed the latest scientific literature on indoor ventilation modes and manuals of various countries, identified characteristics of different ventilation modes and evaluated effects in different application occasions, wherefore to further propose their main limitations and solutions in the epidemic era. For thermal comfort, various non-uniform ventilation modes could decrease the floor-to-ceiling temperature difference, draft rate or PPD by 60%, 80% or 33% respectively, or increase the PMV by 45%. Unsteady ventilation modes (including intermittent ventilation and pulsating ventilation) could lower PPD values by 12%–37.8%. While for air quality and virus spread control, non-uniform ventilation modes could lower the mean age of air or contaminants concentration by 28.3%–47% or 15%–47% respectively, increase the air change efficiency, contaminant removal effectiveness or protection efficiency by 6.6%–10.4%, 22.6% or 14%–50% respectively. Unsteady ventilation mode (pulsating ventilation) could reduce the peak pollutant concentration and exposure time to undesirable concentrations by 31% and 48% respectively. Non-uniform modes and unsteady modes presented better performance in thermal comfort, air quality and virus spread control, whereas relevant performance evaluation indexes were still imperfect and the application scenarios were also limited.

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Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

Section: Impacts On Thermal Comfort Air Quality and Virus Spread Controlmentioning

confidence: 99%

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Fan

Wang

et al. 2022

Building and Environment

View full text Add to dashboard Cite

show abstract

“…The model was established according to the measured data and imported into ANSYS. According to the method provided by Arturs et al, the grid was set and divided, and finite element simulation analysis technology was used to analyze the indoor temperature [ 63 ]. The k-epsilon format was selected for the model, which is conducive to a more stable model analysis.…”

Section: Methodsmentioning

confidence: 99%

“…The grid setting in ANSYS software is very important, which determines the accuracy of the numerical simulations. Arturs et al [ 63 ] used 1.54, 1.92, 0.55, 0.98, 2.09, and 0.34 million hexagonal sections to divide the grid. In this research, mapped meshing and local refinement were selected.…”

Section: Methodsmentioning

confidence: 99%

Study on Passive Heating Involving Firewalls with an Additional Sunlight Room in Rural Residential Buildings

Yang

Dewancker

Chen

2021

IJERPH

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With the growth in China’s economic GDP, energy consumption has increased year by year. The energy demand of rural residential buildings is 223 million tons of standard coal equivalent, accounting for 24% of the national energy demand. Therefore, an energy-saving design for rural residences is necessary. This research took the traditional residences in southern Shaanxi as the research object and combined the cooking methods in southern Shaanxi with solar heating, proposing a sunlight heating system with an additional firewall. The system is composed of a firewall system and a sunlight system. The combination of the two systems prolongs the heating time and makes up for the lack of intermittent heating. The firewall principle involves using the heat generated by cooking through the heat storage and heat release capacity of the wall, and using the principle of heat radiation and convection to increase the indoor temperature. Meanwhile, the principle of the additional sunlight room involves using the external facade of the building to establish an additional sunlight room, by absorbing the heat radiation of the sun and using the principle of heat transfer from the wall. The rapid loss of indoor hot air is avoided, the heating time is prolonged, and part of the heat is retained, thereby improving the heating efficiency. A model was established based on the typical residential model in southern Shaanxi, and the presence or absence of solar radiation on the wall was used as the research variable. Using ANSYS software to simulate the analysis, it is concluded that the firewall–sunlight system can extend the heating time and meet the continuous heating demand, and the heating effect is better than that of the firewall heating system alone. When the walls have solar radiation, the annual heat load reduction rate of the buildings under the new system is 20.21%. When the walls do not have solar radiation, the annual heat load reduction rate of the buildings under the new system is 8.56%.

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“…For many years, building fabric elements also have been investigated in climate chambers, most often in quasi-stationary conditions. Such investigations deal with many problems related to building physics, energy performance of buildings, including all kinds of building fabric and thermal insulation [ 66 , 67 , 68 , 69 ], and the effect of ventilation on thermal comfort and indoor air quality (IAQ), particularly in office buildings [ 70 ]. The advantage of tests conducted in climate chambers over in situ tests in buildings is that they are independent of the weather conditions and therefore can be conducted practically all year round, whereby they are not limited to only the heating season and can be carried out for a set difference in air temperature between the two sides of a building enclosure.…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Possibilities of Thermal Performance Evaluation of the External Walls

Nowak

2021

Materials

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Identification of the actual thermal properties of the partitions of building enclosures has a significant meaning in determining the actual energy consumption in buildings and in their thermal comfort parameters. In this context, the total thermal resistance of the exterior walls (and therefore their thermal transmittance) in the building is a major factor which influences its heat losses. There are many methods to determine the total thermal resistance of existing walls, including the quantitative thermography method (also used in this study). This paper presents a comparison of the calculated total thermal resistance values and the measured ones for three kinds of masonry walls without thermal insulation and the same walls insulated with expanded polystyrene boards. The measurements were carried out in quasi-stationary conditions in climate chambers. The following three test methods were used: the temperature-based method (TBM), the heat flow meter method (HFM) and the infrared thermography method (ITM). The measurement results have been found to be in good agreement with the theoretically calculated values: 61% of the measured values were within 10% difference from the mean value of total thermal resistance for a given external wall and 79% of the results were within 20% difference. All of the used measuring methods (TBM, HFM and ITM) have proven to be similarly approximate in obtained total thermal resistances, on average between 6% and 11% difference from the mean values. It has also been noted that, while performing measurements, close attention should be paid to certain aspects, because they can have a major influence on the quality of the result.

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Impact of impinging jet ventilation on thermal comfort and indoor air quality in office buildings

Cited by 57 publications

References 15 publications

A review of different ventilation modes on thermal comfort, air quality and virus spread control

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Study on Passive Heating Involving Firewalls with an Additional Sunlight Room in Rural Residential Buildings

Non-Destructive Possibilities of Thermal Performance Evaluation of the External Walls

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