Effect of the airflow rate of a ceiling type air-conditioner on ventilation effectiveness in a lecture room

Noh, Kwang-Chul; Han, Changwoo; Oh, Minah

doi:10.1016/j.ijrefrig.2007.07.005

Cited by 30 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Noh1 [2] Conducted an experimental and numerical study on the comparison of thermal comfort (TC) with the indoor air quality (IAQ) in the lecture room for cooling Loads when the operating conditions are changed. Noha [3] investigated experimentally the indoor air (IA) pollution in lecture rooms of Tottori University in Japan. The air was studied quality by monitoring the CO2 level, an index of IA pollution.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

Mareed¹,

Hussen²

2020

ETJ

View full text Add to dashboard Cite

Elevated CO2 rates in a building affect the health of the occupant. This paper deals with an experimental and numerical analysis conducted in a full-scale test room located in the Department of Mechanical Engineering at the University of Technology. The experiments and CFD were conducted for analyzing ventilation performance. It is a study on the effect of the discharge airflow rate of the ceiling type air-conditioner on ventilation performance in the lecture room with the mixing ventilation. Most obtained findings show that database and questionnaires analyzed prefer heights between 0.2 m to 1.2 m in the middle of an occupied zone and breathing zone height of between 0.75 m to 1.8 given in the literature surveyed. It is noticed the mismatch of internal conditions with thermal comfort, and indoor air quality recommended by [ASHRAE Standard 62, ANSI / ASHRAE Standard 55-2010]. CFD simulations have been carried to provide insights on the indoor air quality and comfort conditions throughout the classroom. Particle concentrations, thermal conditions, and modified ventilation system solutions are reported.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

Mareed¹,

Hussen²

2020

ETJ

View full text Add to dashboard Cite

show abstract

“…Noh et al set an experimentally validated CFD model of a lecture room, in order to estimate the CO2 reduction in the occupied zone due to the discharge airflow rate of a ceiling type air-conditioner and the mechanical ventilation rate [16]. Salma et al underlined that aerosol particles in a classroom show large variability in time and space, due the different sources and properties of the indoor microenvironments, suggesting to perform CFD studies in various closed spaces to acquire a statistically significant knowledge to identify both common tendencies and specific features of the indoor pollutants [17].…”

Section: Introductionmentioning

confidence: 99%

Sustainability of Schools: A Multidisciplinary Approach to Studying Air Quality in Educational Buildings

Tonelli

Fontana

Montella

et al. 2020

WIT Transactions on Ecology and the Environment

View full text Add to dashboard Cite

This work reports the preliminary results of the "Sustainability of Schools" (SoS) project, a multidisciplinary project funded by Roma TRE University which involves the departments of architecture, engineering, economics, mathematics and physics, and sciences at Roma Tre University and the Department of Occupational and Environmental Medicine Epidemiology and Hygiene of Italian Workers' Compensation Authority (INAIL). Healthy indoor air and thermal comfort are important for any type of building, but they play an essential role in teaching and learning processes because the intellectual activities are intimately conditioned by these. There is a significant bibliography on the indoor environment in office buildings, while few studies have been focused on educational buildings. The main objective of this project is to form a research team with specific areas of expertise in different fields aimed at defining technologies, methodologies, and protocols to assess the use for health, wellbeing, and energy saving in educational buildings. In this preliminary report of activity, two types of construction have been chosen as case studies, representative of a large number of Italian schools. A building of the first kind, prefabricated and built during the 1960s, is located on the Rome seaside. Two buildings of the second kind are historical properties of Roma Tre University in Rome downtown and are representative of a large number of masonry buildings with thermal mass. Here we present a multidisciplinary methodological approach for measuring indoor air quality parameters (i.e. temperature, relative humidity, concentration of pollutants, presence of ionizing radiation, biotic and abiotic factors) and the development of a class of numerical models. Overall, we paved the way for the future development of more advanced models integrating measures and models.

show abstract

“…The above studies clearly show that internal partitions have a great impact on ventilation performance. However, these works primarily focused on airflow patterns under mixed ventilation, while the effects of both contaminant source characteristics and the locations of supply and exhaust openings on airflow patterns and pollutant distributions were not considered [ 18 , 19 , 20 , 21 ]. Therefore, this paper implemented a numerical simulation of indoor airflow and contaminant distribution under different ventilation patterns to study the effects of internal partitions and the locations of supply and exhaust openings.…”

Section: Introductionmentioning

confidence: 99%

Effects of Internal Partitions on Flow Field and Air Contaminant Distribution under Different Ventilation Modes

Liu

Chen

et al. 2018

IJERPH

View full text Add to dashboard Cite

Based on frequently used internal partitions in offices, the effects of pollutant source characteristics and an internal partition on airflow and contaminant distribution under different ventilation modes are studied in this paper. The indoor flow field measurement is implemented in a 1:1 single environmental chamber under different ventilation patterns, and then the numerical model is established. The numerical method is verified and analyzed by comparing the measured and simulated results. According to the verification results, the numerical simulation is introduced to study the influence of different supply and return air mixes and pollutant source distributions on the flow field and diffusion performance with an internal partition. The indoor flow field and concentration distribution under different conditions are compared, and the discharge efficiency under different working conditions is analyzed. The results indicate that internal partitions have a greater influence on the down-supply up-return ventilation mode than the floor-supply up-return and top-supply down-return ventilation mode. Furthermore, if the room is zoned, the effect of source position is larger under the down-supply up-return ventilation mode than under the other two modes.

show abstract

Effect of the airflow rate of a ceiling type air-conditioner on ventilation effectiveness in a lecture room

Cited by 30 publications

References 11 publications

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

Numerical and Experimental Modeling of Indoor Air Quality Inside a Conditioned Space with Mechanical Ventilation and DX-Air Conditioner

Sustainability of Schools: A Multidisciplinary Approach to Studying Air Quality in Educational Buildings

Effects of Internal Partitions on Flow Field and Air Contaminant Distribution under Different Ventilation Modes

Contact Info

Product

Resources

About