scholarly journals Difenbahya (Dieffenbachia amoena Gentil)’nın Sıcaklığa Bağlı Olarak İç Ortamdaki CO2 Miktarına Etkisi

2017 ◽  
Vol 5 (8) ◽  
pp. 973
Author(s):  
Hakan Şevik ◽  
Mehmet Çetin ◽  
Kerim Güney ◽  
Nur Belkayalı
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Human Life ◽  
Ornamental Plant ◽  
Nasal Discharge ◽  
Rate Of Photosynthesis ◽  
Metabolic Activities ◽  
And Performance

Today, at least 80% of human life spends time in closed areas; indoor air quality directly affects people's health and performance. In particular, when CO2 rises above certain levels, it causes many discomforts such as headache, dizziness, fatigue, concentration disorders, throat and nose irritation, nasal discharge, coughing and eye runoff on certain levels. The most important factor affecting the amount of CO2 in indoor area is live metabolic activities. The amount of CO2 is increased by respiration that decreases with photosynthesis. Therefore, plants can be used indoors to reduce the amount of CO2. However, since there is not enough information on this subject, plants can not be used efficiently and consciously to reduce the amount of CO2 in indoor area. In this study, it was aimed to determine the effect of Dieffenbachia which is one of the most commonly used plants as an indoor ornamental plant depending on the temperature of the effect of CO2 on indoor area. As a result of the study, it was determined that the breathing of the Dieffenbachia in the dark area is insignificant depending on the temperature. However, the highest efficacy is observed at temperatures of 23-24°C in the presence of light. The results of the study shows that the rate of photosynthesis at temperature of 30°C was found to be lower than 20°C even though it was higher than 15°C.

IMPROVING INDOOR AIR QUALITY USING LOCAL EXHAUST VENTILATION (LEV)

2015 ◽  
Vol 76 (6) ◽  
Author(s):  
Norasikin Binti Hussin ◽  
Dzullijah Binti Ibrahim ◽  
Farrah Noor Binti Ahmad ◽  
Nur Hayati Binti Mohd Yahya ◽  
Siti Mardini Binti Hashim
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Local Exhaust Ventilation ◽  
Healthy Environment ◽  
Exhaust Ventilation ◽  
Hot Environment ◽  
Environmental Criteria ◽  
Level Of Satisfaction ◽  
And Performance

Ventilation is used to control indoor air quality for maintaining the health and performance of human and ensuring healthy environment. It is known that the environmental criteria are dictated by temperature, humidity, and contamination. In a case study at XY company, questionnaires were distributed to the workers and interviews were conducted to find out the level of satisfaction on working conditions in certain areas. 70% respondents reported feeling uncomfortable because of heat, dust and hot environment. An analysis of indoor air quality was carried out to measure the temperature at pouring area. Based on the analysis, the range of temperatures is from 35°C to 43°C. A local exhaust ventilation (LEV) system was design for improve indoor air quality and reduce extreme heat. The LEV system was proposed for the pouring area to capture then discharged heat or contaminants through a series of strategically placed overhead ducts.

scholarly journals Applying Outdoor Environment to Develop Health, Comfort, and Energy Saving in the Office in Hot-Humid Climate

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Rong Chen ◽  
Wen-Pei Sung ◽  
Hung-Chang Chang ◽  
Yi-Rou Chi
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Indoor Environment ◽  
Human Life ◽  
Meta Analysis ◽  
Outdoor Environment ◽  
Survey Analysis ◽  
Humid Climate ◽  
Lower Temperature

A human life demand set to emerge in the future is the achievement of sustainability by maintaining a comfortable indoor environment without excessive reliance on energy-consuming air conditioners. The major research processes in this study are: (1) measuring indoor air quality and thermal comfort to evaluate the comfort of an indoor environment; (2) implementing questionnaire survey analysis to explore people’s environmental self-perceptions and conducting a meta-analysis of the measurement results for air quality and physical aspects; and (3) constructing an indoor monitoring and management system. The experimental and analysis results of this research reveal that most of the office occupants preferred a cooler environment with a lower temperature. Additionally, because the summers in Taiwan are humid and hot, the occupants of an indoor space tend to feel uncomfortable because of the high humidity and poor indoor air quality. Therefore, Variable Air Volume (VAV), two air intakes, and exhaust plant are installed to improve indoor environment. After improvement, a lower temperature (approximately 21.2–23.9°C) indirectly reduces humidity, thereby making the occupants comfortable. Increasing air velocity to0.1~0.15 m/s, the carbon dioxide concentrations decrease below the requirement of the WHO. Ninety-five percent of the workers corresponded to the standard comfort zone after this improvement.

scholarly journals Characterization of Indoor Air Quality on a College Campus: A Pilot Study

2019 ◽  
Vol 16 (15) ◽  
pp. 2721 ◽  
Author(s):  
Grant Erlandson ◽  
Sheryl Magzamen ◽  
Ellison Carter ◽  
Julia L. Sharp ◽  
Stephen J. Reynolds ◽  
...  
Keyword(s):  
Higher Education ◽  
Carbon Dioxide ◽  
Particulate Matter ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
College Campuses ◽  
College Campus ◽  
And Performance

Recent construction trends on college campuses have demonstrated a shift to designing buildings with features focused on sustainability. However, few studies have investigated indoor air quality in institutions of higher education, particularly in sustainably designed buildings. The objective of this study was to evaluate the association of building and occupancy on indoor air quality within and between higher education buildings. We measured particulate matter, formaldehyde, carbon dioxide, and nitrogen oxides in LEED certified, retrofitted, and conventional building types on a college campus. Three size fractions of particulate matter were measured in each building. We conducted multi-zonal, 48-h measurements when the buildings were occupied and unoccupied. Outdoor particulate matter was significantly higher (PM2.5 = 4.76, PM4 = 17.1, and PM100 = 21.6 µg/m3) than in classrooms (PM2.5 = 1.7, PM4 = 4.2, and PM100 = 6.7 µg/m3) and common areas (PM2.5 = 1.3, PM4 = 4.2, and PM100 = 4.8 µg/m3; all p < 0.001). Additionally, concentrations of carbon dioxide and particulate matter were significantly higher (p < 0.05) during occupied sampling. The results suggest that occupancy status and building zone are major predictors of indoor air quality in campus buildings, which can, in turn, increase the concentration of contaminants, potentially impacting occupant health and performance. More research is warranted to reveal building features and human behaviors contributing to indoor exposures.

Indoor Air Quality of an Educational Building and its Effects on Occupants’ Comfort and Performance

2017 ◽  
Author(s):  
Ahmed Khalfan Al-Rawahi ◽  
Ali Al-Alili
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Indoor Air Pollution ◽  
Good Condition ◽  
Personal Time ◽  
Indoor Pollutant ◽  
High Concentrations ◽  
And Performance

Indoor Air Quality (IAQ) studies the air quality inside different types of environments and relates it to the health and comfort of occupants. Understanding and controlling common pollutants indoors can help in decreasing effects and the risks associated with these pollutants. Unhealthy indoor environment could lead to serious problems in people health and productivity. According to ASHRAE, 80–90% of personal time is spent indoors. As a result, indoor air pollution has gained a lot of interest and the number of studies on occupant health inside buildings grew very significantly in the last decades. The purpose of this study is to investigate the effect of indoor air quality inside an educational buildings on occupants’ comfort and performance. Various indoor pollutant such as, Carbon dioxide, Carbon monoxide, Volatile organic compounds, Particulates, and formaldehyde, are measured. The indoor air contaminants will be detected using IAQ measurement devices. The value of the pollutants is compared to maximum allowed values in ASHRAE standard 62.1. In addition, the occupant thermal comfort is reported using two indices which are Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD). The relationship between the performance and the indoor air quality is also discussed. The results will discover the sources of the indoor air pollutants and accordingly suggestions will be given toward improving the indoor air quality. The final results showed that the IAQ is generally in a good condition for the majority of classrooms except for the TVOC which was always at high concentrations. Also, for some classrooms, the CO2 level and the relative humidity were exceeding the maximum limit. Regarding the thermal comfort, all the classrooms do not comply with ASHRAE Standard 55-2013. Therefore, they are not thermally comfortable.

scholarly journals The Incidence of Sick Building Syndrome and Its Causes on Employees at the Governor’s Office of West Sulawesi Province

2021 ◽  
Vol 10 (2) ◽  
pp. 153
Author(s):  
Ridhayani Adiningsih ◽  
Miftah Chairani Hairuddin
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Air Temperature ◽  
Indoor Air ◽  
Human Life ◽  
Skin Irritation ◽  
Sick Building Syndrome ◽  
P Value ◽  
Cross Sectional ◽  
Sick Building

Introduction: Indoor air quality greatly affects human health because almost 90% of human life is indoors. Some symptoms that are often felt by employees in a building with Sick Building Syndrome (SBS) are fatigue; headaches; symptoms of eye, nose and throat irritation; skin irritation; dry cough, increased irritability and difficulty in concentration; nausea; drowsiness; and hypersensitivity to odor. This research aims to determine the relationship of air quality in space to the incidence of Sick Building Syndrome. Methods: This research was an analytic survey research with cross sectional approach. The samples in this study were employees who were in the Building D of the Provincial Governor's Office, West Sulawesi totalling 82 people. This research was carried out by measuring indoor air quality and giving questionnaires to find out the SBS events. Results: The results of room temperature measurements ranged from 26.14 - 41.46°C, humidity measurement was ≥ 60%, light intensity was ≤ 100 lux, the chemical quality of CO in the air was ≤ 29 mg/m3, CO2 levelin the air was ≤ 1000 ppm, and dust level was ≥ 0.15 mg/m3. Besides, there was a significant relationship between air temperature and dust levels on the incidence of Sick Building Syndrome (SBS), with p value of 0.006. Conclusion: It can be concluded that factors that influenced the occurrence of SBS were air temperature and dust concentration in the room.Keywords: indoor air quality, office, sick building syndrome

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