Influence of Temperature and Humidity Control in Air Conditioning on Indoor Environment Quality and Human Feelings

2012 ◽  
Vol 256-259 ◽  
pp. 2648-2651
Author(s):  
Yu Ping Sun ◽  
Neng Zhu
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Climatic Conditions ◽  
Humidity Control ◽  
Environment Quality ◽  
Indoor Environment Quality ◽  
Temperature And Humidity

In this study, the oxygen contents of the indoor air quality in different climatic conditions in a chamber were real-time monitored. At the same time, ten young volunteers sit in the three different environment conditions to fill subject feeling questionnaires. The climatic conditions referred to three groups of hot and humid environment (30°C, 35°C, 40°Cdry bulb temperature and 90% relative humidity). The results reveal the oxygen content of indoor air quality slightly decreased in different thermal environments, the values within normal variations. Questionnaire statistic results indicate that the temperature and humidity control in air conditioning significantly influence the human feelings. Thirsty, head heavy, tired, irritability, distraction, chest tightness and cold sweating are the main emerging symptoms in such indoor environments. Reasonable control of indoor temperature and humidity has vital importance to indoor environment quality.

Literature Survey on Building Rankings by Indoor Environment Quality

2011 ◽  
Vol 90-93 ◽  
pp. 3047-3050
Author(s):  
Xue Bin Yang ◽  
De Fa Sun ◽  
Xiang Jiang Zhou ◽  
Guang Ping Lin
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Evaluation System ◽  
Indoor Environment ◽  
Environmental Parameters ◽  
Building Performance ◽  
Public Places ◽  
Environment Quality ◽  
Indoor Environment Quality

Indoor environment quality can be used to rank the building performance. Environmental parameters involve operative or room temperature, predicted mean vote, predicted percentage of thermally satisfied, predicted percentage dissatisfied, air velocity, relative humidity, indoor air quality and so on. One or more parameters can be possible to establish a corresponding range for building classes. Average CO2 concentration level can be used as the index of indoor air quality to measure the office buildings or public places. Various authors in different climates or zones proposed different baseline for building grades. It should be develop a scientific methodology or evaluation system to give the convincing classification and explanation.

Literature Surveys on Benchmarking and Rating of Buildings

2011 ◽  
Vol 71-78 ◽  
pp. 3520-3523
Author(s):  
Xue Bin Yang ◽  
De Fa Sun ◽  
Xiang Jiang Zhou ◽  
Ji Chun Yang
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Indoor Environment ◽  
Energy Performance ◽  
Environment Quality ◽  
Indoor Environment Quality ◽  
Occupant Satisfaction ◽  
Comfort Criteria

This study reviews some published literatures on the benchmarking and ranking guidelines, tools and comparison of buildings. Energy performance, Indoor air quality and thermal comfort can be covered for the rating tools for buildings. Further, the energy performance can also be calculated by the other parameters related to the room thermal properties. A rating system to benchmark buildings can employ several parameters including indoor environment quality, clothing volume, predicted mean vote, operative temperature, and thermal energy consumption. It can be concluded that the indoor air quality or thermal comfort can be used to evaluate buildings due to their influence on the occupant satisfaction and job performance. Also, building benchmarking or rating will be various because Different comfort criteria may lead to different comfort temperature.

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.

Indoor Air Quality Investigation of Public Sites in Isolated Islands within Taiwan Strait

2012 ◽  
Vol 209-211 ◽  
pp. 1576-1579 ◽  
Author(s):  
Kuo Jung Hsien ◽  
Yi Tun Wang ◽  
Yi Chyun Hsu ◽  
Ting Nien Wu ◽  
Yun Hwei Shen ◽  
...  
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Taiwan Strait ◽  
High Co2 ◽  
Threshold Levels ◽  
Crowd Control ◽  
Bacteria And Fungi

The selected 21 public sites for indoor air quality (IAQ) investigation located at Penghu and Kinmen Islands (Taiwan). IAQ measurements include CO2, CO, HCHO, TVOCs, bacteria, fungi, PM10, PM2.5, O3 and temperature, which were conducted during year 2010 and 2011. The results showed that the concentrations of CO, HCHO, PM10 and PM2.5 were below Taiwan EPA’s suggested IAQ threshold levels at all public sites. CO2 concentrations at hospitals and school are all exceeding category 1 threshold of 600 ppm. Besides, the levels of O3 and bacteria for hospitals and fungi for schools were all higher than the suggested IAQ threshold levels. One supermarket was found exceeding the suggested IAQ threshold levels on TVOCs and CO2. The theater was found exceeding the suggested bacteria threshold. This study discovered that the high CO2, bacteria and fungi levels occurred at various public sites. Accordingly, the regulated strategy of crowd control and air conditioning management was required for a healthy indoor environment.

scholarly journals Effects of Climatic Conditions, Season and Environmental Factors on CO2 Concentrations in Naturally Ventilated Primary Schools in Chile

2021 ◽  
Vol 13 (8) ◽  
pp. 4139
Author(s):  
Muriel Diaz ◽  
Mario Cools ◽  
Maureen Trebilcock ◽  
Beatriz Piderit-Moreno ◽  
Shady Attia
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Primary Schools ◽  
Co2 Concentration ◽  
Building Design ◽  
Climatic Conditions ◽  
Indoor Environmental Quality ◽  
Co2 Concentrations ◽  
The Impact

Between the ages of 6 and 18, children spend between 30 and 42 h a week at school, mostly indoors, where indoor environmental quality is usually deficient and does not favor learning. The difficulty of delivering indoor air quality (IAQ) in learning facilities is related to high occupancy rates and low interaction levels with windows. In non-industrialized countries, as in the cases presented, most classrooms have no mechanical ventilation, due to energy poverty and lack of normative requirements. This fact heavily impacts the indoor air quality and students’ learning outcomes. The aim of the paper is to identify the factors that determine acceptable CO2 concentrations. Therefore, it studies air quality in free-running and naturally ventilated primary schools in Chile, aiming to identify the impact of contextual, occupant, and building design factors, using CO2 concentration as a proxy for IAQ. The monitoring of CO2, temperature, and humidity revealed that indoor air CO2 concentration is above 1400 ppm most of the time, with peaks of 5000 ppm during the day, especially in winter. The statistical analysis indicates that CO2 is dependent on climate, seasonality, and indoor temperature, while it is independent of outside temperature in heated classrooms. The odds of having acceptable concentrations of CO2 are bigger when indoor temperatures are high, and there is a need to ventilate for cooling.

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 Transient Effects of Different Ventilation Methods on Car Indoor Air Quality

2015 ◽  
Vol 2 (1) ◽  
pp. 70 ◽  
Author(s):  
Feng-Chyi Duh
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Air Conditioning ◽  
Heat Index ◽  
Transient Effects ◽  
Air Conditioning System ◽  
Carbon Dioxide Concentrations ◽  
Volatile Organic

This study investigated transient effects on the air quality of parked cars and moving cars with and without operating air conditioning. Carbon dioxide, carbon monoxide, volatile organic compounds, and formaldehyde concentrations were measured for comparative analysis. The results showed that simply changing the air conditioning system from internal circulation to external circulation to introduce air from outside reduces carbon dioxide concentrations by more than 50%, volatile organic compound concentrations by more than 77%, and the heat index from 0.1℃/min to less than 0.05 ℃/min. In order to conserve energy and improve car indoor air quality, this study can serve as a reference on healthy car environments.

scholarly journals Mitigation Strategies for Overheating and High Carbon Dioxide Concentration within Institutional Buildings: A Case Study in Toronto, Canada

Buildings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 124 ◽  
Author(s):  
Claire Tam ◽  
Yuqing Zhao ◽  
Zaiyi Liao ◽  
Lian Zhao
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Air Temperature ◽  
Indoor Air ◽  
Indoor Environment ◽  
Thermal Conditions ◽  
Co2 Concentration ◽  
Hvac System

Indoor air quality and thermal conditions are important considerations when designing indoor spaces to ensure occupant health, satisfaction, and productivity. Carbon dioxide (CO2) concentration and indoor air temperature are two measurable parameters to assess air quality and thermal conditions within a space. Occupants are progressively affected by the indoor environment as the time spent indoors prolongs. Specifically, there is an interest in carrying out investigations on the indoor environment through surveying existing Heating, Ventilation, Air Conditioning (HVAC) system operations in classrooms. Indoor air temperature and CO2 concentration in multiple lecture halls in Toronto, Canada were monitored; observations consistently show high indoor air temperature (overheating) and high CO2 concentration. One classroom is chosen as a representative case study for this paper. The results verify a strong correlation between the number of occupants and the increase in air temperature and CO2 concentration. Building Energy Simulation (BES) is used to investigate the causes of discomfort in the classroom, and to identify methods for regulating the temperature and CO2 concentration. This paper proposes retro-commissioning strategies that could be implemented in institutional buildings; specifically, the increase of outdoor airflow rate and the addition of occupancy-based pre-active HVAC system control. The proposed retrofit cases reduce the measured overheating in the classrooms by 2-3 °C (indoor temperature should be below 23 °C) and maintain CO2 concentration under 900 ppm (the CO2 threshold is 1000 ppm), showing promising improvements to a classroom’s thermal condition and indoor air quality.

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