scholarly journals Optical Sensing Approach to the Recognition of Different Types of Particulate Matters for Sustainable Indoor Environment Management

2020 ◽  
Vol 12 (24) ◽  
pp. 10568
Author(s):  
Hosang Ahn ◽  
Jae Sik Kang ◽  
Gyeong-Seok Choi ◽  
Hyun-Jung Choi
Keyword(s):  
Indoor Air ◽  
Indoor Environment ◽  
Particulate Matters ◽  
Outdoor Air ◽  
Household Dust ◽  
Tree Pollen ◽  
Contaminant Source ◽  
Pine Tree ◽  
Reflected Light ◽  
And Control

The indoor environment is a crucial part of the built environment where our daily time is mostly spent. It is governed not only by indoor activities, but also affected by interconnected activities such as door opening, walking and routine tasks throughout the inside and outside of buildings and houses. Pollutant control is one of the major concerns for maintaining a sustainable indoor environment, and finding the source of pollutants is a relatively hard part of that task. Pollutants are emitted from various sources, transformed by sunlight, react with vapor in ozone and are transported into cities and from country to country. Due to these reasons, there has been high demand to monitor the transportation of particulate matters and improve air quality. The monitoring of pollutants and identification of their type and concentration enables us to track and control their generation and consequently discover reliable suitable mitigation measures to control air quality at regulated levels by contaminant source removal. However, the monitoring of pollutants, especially particulate matter generation and its transportation, is still not fully operated in atmospheric air due to its open nature and meteorological factors. Even though indoor air is relatively easier to monitor and control than outdoor air in the aspect of specific volume and contaminant source, meteorological parameters still need to be considered because indoor air is not fully separated from outdoor air flow and contaminants’ transportation. In this study, an optical approach using a spectral sensor was attempted to reveal the feasibility of wavelength and chromaticity values of reflected light from specific particles. From the analysis of reflected light of various particulate matters according to different liquid additives, parameter studies were performed to investigate which experimental conditions can contribute to the enhanced selective sensing of particulate matter. Five different particulate matters such as household dust, soil, talc powder, gypsum powder and yellow pine tree pollen were utilized. White samples were selectively identified by the peak at 720 nm for talc and 433 nm and 690 nm in wavelength for gypsum under chemical additives. Other grey household dust and yellowish soil and pine tree pollen revealed a distinct chromaticity x, y coordinates shift in vector within the maximum range from (0.22, 0.19) to (0.55, 0.48). Applicable approaches to assist current particle matter sensors and improve the selective sensing were suggested.

scholarly journals Optical Sensing Approach to Recognition of Different Types of Particulate Matters for Sustainable Indoor Environment Management

2020 ◽  
Author(s):  
Hosang Ahn ◽  
Jae Sik Kang ◽  
Gyeong-Seok Choi ◽  
and Hyun Jung Choi
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Indoor Air ◽  
Particulate Matters ◽  
Light Spectrum ◽  
Household Dust ◽  
Experimental Conditions ◽  
Atmospheric Air ◽  
Reflected Light ◽  
And Control

As climate changes, our daily life has been much influenced by abnormal meteorological phenomena such as heavy rainfall, heat wave, heavy snowfall, and fine dust. Atmospheric air quality is worsening day by day and indoor air quality is also affected by interconnected daily activities throughout the inside and outside of buildings and houses. Nowadays, pollutants from various sources are emitted, transformed by sunlight, vapor, and ozone and transported into the city from country to country. Due to these reasons, there have been high demands to monitor the transportation of particulate matters and improve air quality. Monitoring of pollutants and identification of type and its concentration enables us to track and control its generation and consequently find out the solution. However, monitoring of pollutants, especially, particulate matter generation and its transportation is still not fully operated in atmospheric air due to its open nature and meteorological factors. Even though indoor air is relatively easy to monitor and control than outdoor in the aspect of specific volume and contaminant source, but it still needs to consider the meteorological parameters because indoor air is not fully separated from the outdoor air flow and contaminants transportation. In this study, optical approach using spectral sensor was attempted to reveal the feasibility of wavelength and chromaticity values of reflected light from specific particles. From the analysis of reflected light of various particulate matters according to different liquid additives, parameter studies were performed to investigate which experimental conditions can contribute to the enhanced selective sensing of particulate matters. Five different particulate matters such as household dust, soil, talc powder, gypsum powder and yellow pine tree pollen were utilized and observed to elucidate the relationship between property of particulate matter and detected light spectrum. Applicable approaches to assist current particle matter sensors and improve the selective sensing were suggested.

A DIGITAL METHOD FOR MEASURING THE THERMAL COMFORT OF THE AIR

2002 ◽  
Vol 14 (04) ◽  
pp. 175-181
Author(s):  
TANG-JEN LIU ◽  
MING-SHING YOUNG
Keyword(s):  
Thermal Comfort ◽  
Indoor Air ◽  
Indoor Environment ◽  
Comfort Level ◽  
Digital Method ◽  
Outdoor Air ◽  
Air Movement ◽  
Mathematical Expressions ◽  
Temperature And Humidity ◽  
The Mathematical Model

Opening windows is frequently done to refresh the indoor air for the occupants. To maintain the cleanliness and freshness of the indoor air, more outdoor air is needed. But its high temperature and humidity are harmful to the thermal comfort of the indoor environment. Therefore, determining the amount of outdoor air allowed to enter the room is very important for the optimum conditioning of the indoor air. The ASHRAE comfort charts indicate the percentage of subjects feeling comfortable during various combinations of dry-bulb temperature, humidity, and air movement. A set of mathematical expressions were proposed to model the charts in order to calculate the comfort degree of the outdoor air automatically with its temperature and humidity. In this paper, the measurement of temperature and humidity was completed by a self-developed digital method. Besides, the comfort level of the sampled air was also simultaneously determined by this digital method based on the mathematical model of comfort charts. The system implemented based on our method is portable. This will let us make good use of the outdoor air and controll the ventilation machine more effectively.

scholarly journals Plum Rain-Season-Oriented Modelling and Intervention of Indoor Humidity with and without Human Occupancy

Atmosphere ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 97
Author(s):  
Jin Ye ◽  
Hua Qian ◽  
Xiaohong Zheng ◽  
Guoqing Cao
Keyword(s):  
Indoor Air ◽  
Indoor Environment ◽  
Meteorological Data ◽  
Internal Source ◽  
Mold Growth ◽  
Outdoor Air ◽  
Rain Season ◽  
Reduction Methods ◽  
Indoor Humidity

The plum rain season, caused by precipitation along a persistent stationary Mei-Yu front in East Asia, creates favorable temperatures and relative humidity (RH) for mold growth indoors. This paper investigates the effects of human occupancy on indoor humidity and investigates the efficient RH reduction methods to prevent mold growth in moist climates. The research is carried out based on a case study which compares a family-occupied home and another unoccupied one during typical plum rain season in Nanjing. Firstly, by analyzing the factors that can influence the indoor air RH, this paper develops a comprehensive model to evaluate the efficiency of various RH intervention methods. Secondly, this paper collects the meteorological data in Nanjing at different time scales, from days to hours. Thirdly, a specific case study is carried out based on the model and data. The results show that dehumidification and heating can always reduce RH below the critical value under which the mold growth could be inhibited. However, the effects of ventilation are more sophisticated and depend upon the human occupancy, outdoor air temperature, and air change per hour (ACH). In certain unoccupied cases, the ventilation may be inappropriate and may continuously bring moisture outside into the indoor environment, which has adverse effects on mold suppression. In the occupied cases, the condition changes significantly because the human is deemed as an internal source of heat and moist. Special care should be exercised for occupied ventilation in order to determine the optimal ACH and appropriate outdoor temperatures. Finally, some guidance is given to prevent mold growth in the general area that suffers from the plum rain season.

scholarly journals Effects of room airflow on accurate determination of PUF-PAS sampling rates in the indoor environment

2018 ◽  
Vol 20 (5) ◽  
pp. 757-766 ◽  
Author(s):  
Nicholas J. Herkert ◽  
Keri C. Hornbuckle
Keyword(s):  
Indoor Air ◽  
Indoor Environment ◽  
Accurate Determination ◽  
Passive Samplers ◽  
Air Toxics ◽  
Precise Interpretation

Accurate and precise interpretation of concentrations from polyurethane passive samplers (PUF-PAS) is important as more studies show elevated concentrations of PCBs and other semivolatile air toxics in indoor air of schools and homes.

Computational Modeling of Particulate Pollutant Transport in a Ventilated Room in the Presence of Two Heated Breathing and Rotating Manikins

2017 ◽  
Author(s):  
Seyed Ali Keshavarz ◽  
Mazyar Salmanzadeh ◽  
Goodarz Ahmadi
Keyword(s):  
Air Quality ◽  
Computational Modeling ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Rotational Motion ◽  
Indoor Environment ◽  
Ventilation System ◽  
Thermal Plume ◽  
Displacement Ventilation ◽  
Simulation Results

Recently, attention has been given to indoor air quality due to its serious health concerns. Clearly the dispersion of pollutant is directly affected by the airflow patterns. The airflow in indoor environment is the results of a combination of several factors. In the present study, the effects of thermal plume and respiration on the indoor air quality in a ventilated cubicle were investigated using an unsteady computational modeling approach. The person-to-person contaminant transports in a ventilated room with mixing and displacement ventilation systems were studied. The effects of rotational motion of the heated manikins were also analyzed. Simulation results showed that in the cases which rotational motion was included, the human thermal plume and associated particle transport were significantly distorted. The distortion was more noticeable for the displacement ventilation system. Also it was found that the displacement ventilation system lowered the risk of person-to-person transmission in an office space in comparison with the mixing ventilation system. On the other hand the mixing system was shown to be more effective compared to the displacement ventilation in removing the particles and pollutant that entered the room through the inlet air diffuser.

scholarly journals Achieving a healthy indoor environment by using an emissions barrier for stopping spread of chemicals from building into the indoor air

2021 ◽  
Author(s):  
Johan Mattsson ◽  
Lennart Larsson
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Aromatic Hydrocarbons ◽  
Indoor Environment ◽  
Concrete Slab ◽  
Treated Wood ◽  
Volatile Organic ◽  
Polycyclic Aromatic

An emissions barrier was used in premises with indoor air complaints due to emissions from the buildings in question. The emissions comprised chlorophenols/chloroanisoles and polycyclic aromatic hydrocarbons (PAH) from treated wood, and volatile organic compounds (VOC), mainly 2-ethylhexanol, from PVC flooring and the glue used to paste the flooring onto a concrete slab. Attaching the barrier at the surfaces from where the emissions were spread (floor, walls, ceiling) resulted in a fresh and odour-free indoor air. We conclude that using an emissions barrier in buildings made unhealthy by moisture is an efficient way of restoring a pleasant and healthy indoor air.

scholarly journals The Perception of the Indoor Environment Quality (IEQ) of Private Hostels in Ifite-Awka, Nigeria

2020 ◽  
pp. 61-70
Author(s):  
F. O. Ezeokoli ◽  
C. A. Omenyi ◽  
C. B. N. Bert- Okonkwo ◽  
N. B. Iheama
Keyword(s):  
Indoor Air Quality ◽  
Indoor Air ◽  
Indoor Environment ◽  
Light Quality ◽  
Anambra State ◽  
Environment Quality ◽  
Direct Observations ◽  
Literature Searches ◽  
Indoor Environment Quality ◽  
Inadequate Ventilation

This study aimed at evaluating the indoor environment conditions of the private hostels in Ifite Awka Anambra state with a view to establishing its quality and impacts on students dwelling on these hostels in the study area. Being a survey research, the study was affected by the use of questionnaire, literature searches and direct observations. Accordingly, a total of 311 questionnaires were administered while 258 questionnaires which represent 83% were returned and found useful. The study found that IEQ parameters of hostels in study area are: Indoor air quality was poor due to inadequate ventilation of rooms; thermal comfort of rooms was found to be warm; indoor light quality was found good and the acoustics comfort and noise slightly good and to some extent poor. Therefore, the study recommended that during the design and construction of buildings, IEQ parameters should be considered, so as to obtain a quality indoor environment.

scholarly journals Problems of monitoring indoor air pollution and control in slums of Rajpur-Sonarpur Municipality, South 24 Parganas, West Bengal-An appraisal

2021 ◽  
Vol 9 (9) ◽  
pp. 1012-1019
Author(s):  
Tapasi Das
Keyword(s):  
Air Pollution ◽  
Indoor Air ◽  
Indoor Air Pollution ◽  
Total Population ◽  
Respiratory Illness ◽  
Health Hazards ◽  
Present Condition ◽  
Economic Activities ◽  
Slum Dwellers ◽  
And Control

Abstract: The slum dwellers suffer from a lot of problems in day to day life in terms of socio-cultural and economic environment. They can not avail proper education due to poor economic condition and uncertainty in livelihood and thus have to choose different indoor economic activities. As per 2011 census, the total population of Rajpur-Sonarpur Municipality is 424,368 with population density of 1574/Km2.The slum dwellers live overcrowding in lightless suffocating and unhygienic places and many of them suffer from poor indoor air quality (IAQ). As a result they have to face different health hazards like respiratory illness, lung disease, skin disease, eye dryness etc. In this paper, an enquiry has been conducted to highlight the present condition of indoor air pollution of the slum area of Rajpur-Sonarpur Municipality and also focus on the problems of monitoring indoor air pollution and its control. Keywords: health hazards, IAQ, suffocating and unhygienic places

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