Investigation on thermal performance of the wall-mounted attached ventilation for night cooling under hot summer conditions

Ji, Wenhui; Luo, Qing; Zhang, Zili; Wang, Houhua; Du, Tao; Heiselberg, Per

doi:10.1016/j.buildenv.2018.10.002

Cited by 17 publications

(8 citation statements)

References 39 publications

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“…There are many so-called hybrid ventilation strategies that combine different aspects of both mixing and displacement ventilation, such as impinging jet ventilation [2,4,[14][15][16], under floor air distribution [4,17,18], wall attached ventilation [4,19], and confluent jet ventilation (CJV) [2,4,20]. The aim of the hybrid systems is generally to overcome some of the limitations of displacement ventilation by increasing the momentum of the supplied air while still maintaining semi-stratified conditions [4].…”

Section: Introductionmentioning

confidence: 99%

A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room

2022

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In this study, confluent jets ventilation (CJV) supply devices with three different nozzle arrays (1 × 19, 2 × 19, 3 × 19) were investigated both numerically and experimentally at two different airflow and supply air temperature set-ups. The performance of the CJV supply devices was investigated concerning thermal comfort, indoor air quality (IAQ), and heat removal effectiveness in a conference room environment. A comparison between the experimental and numerical results showed that the ϑ2¯−f model had the best agreement out of the investigated turbulence models. The numerical results showed that the size of the array had a great impact both on near-field development and on the conditions in the occupied zone. A larger array with multiple rows and a lower momentum conserved the inlet temperature and the mean age of the air better than a single-row array with a higher momentum. A larger array with multiple rows had a higher IAQ and a greater heat removal effectiveness in the occupied zone because the larger array conserved the mean age of air better and the buoyancy driven flow was slightly better at removing the heat. Because of the lower inlet velocities, they also had lower velocities at ankle level, which decreased the risk of draft and thermal discomfort.

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Section: Introductionmentioning

confidence: 99%

A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room

2022

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“…Traditional individual heating is still the main means of heating houses. Inexpensive biomass fuels such as straw and firewood have been widely used until now [2]. According to the statistics, the total amount of bioenergy produced in rural areas of China is about 6 million tons per year, of which about 60% is used for heating and cooking [3].…”

Section: Introductionmentioning

confidence: 99%

Study on a New Type of Ventilation System for Rural Houses in Winter in the Severe Cold Regions of China

2022

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The weather in the high latitudes of China is cold in winter. The pollution caused by the burning of biomass fuels used in rural individual heating is a great threat to human health. This study finds that the amounts of CO2, CO, PM2.5, and PM10 in the bedroom exceed the standard and the temperature does not meet the standard based on indoor air measurements in rural residential buildings in Liaoning Province in winter. In this study, a mechanical ventilation method which uses flue gas to preheat fresh air is proposed, for the purpose of simultaneously improving the indoor air quality and the thermal environment of rural houses. The flue gas–fresh air heat exchange (FGFAHE) experiment shows that biomass combustion flue gas can increase the outdoor air temperature by 23.7 °C on average. The ventilation experiment shows that the method of mechanical ventilation combined with external window penetration can increase the dilution rate of indoor CO by more than 1 times. The simulation results of six different ventilation schemes show that the ventilation mode of the diagonal opposite side upper air supply and lower exhaust air (DOUSLE) has the best effect on indoor CO prevention and control, and the mode of median air supply is the most beneficial to the indoor thermal environment.

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“…The cooled building elements can then act as a heat sink during the occupied period of the next day to absorb the heat gains and reduce risks of overheating [2]. In past decades, many researchers have experimentally or numerically investigated the building performance improvement offered by NV [3][4][5][6][7][8][9][10][11][12][13][14]. However, architects and engineers still hesitate to adopt NV in building design due to the high uncertainty in predicting its performance by using building energy simulation (BES) tools.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Experimental investigation of convective heat transfer for night ventilation in case of mixing ventilation

Guo

Heiselberg

et al. 2021

Building and Environment

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Investigation on thermal performance of the wall-mounted attached ventilation for night cooling under hot summer conditions

Cited by 17 publications

References 39 publications

A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room

A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room

Study on a New Type of Ventilation System for Rural Houses in Winter in the Severe Cold Regions of China

Experimental investigation of convective heat transfer for night ventilation in case of mixing ventilation

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