scholarly journals Improving the indoor air quality using the individual air supply system

2017 ◽  
Vol 15 (4) ◽  
pp. 689-696 ◽  
Author(s):  
E. Zender-Świercz
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Supply System ◽  
Air Supply ◽  
The Individual

The Analysis of Comfortable and Energy Saving of Ice-Storage Low Temperature Air Supply System

2014 ◽  
Vol 960-961 ◽  
pp. 635-638
Author(s):  
Li Bai ◽  
Xue Zhi Zhou ◽  
Yan Wang ◽  
Ya Wei Hua
Keyword(s):  
Low Temperature ◽  
Energy Saving ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Integrated Approach ◽  
Supply System ◽  
Energy Resources ◽  
Ice Storage ◽  
Air Supply ◽  
Save Energy

More and more attentions have been paid on ice-storage low temperature air supply system because of its notable energy saving effects and comfort. The paper expatiate on that ice-storage low temperature air supply system brings a series of especial superiority to modern air-condition cause. The results show that low temperature air supply system can exert the potential advantage of ice-storage further. The combination of ice-storage and low temperature air supply system can obtain an “integrated approach”, which can save energy resources and improve human body comfort and indoor air quality.

Numerical Study on Indoor Air Quality of Commercial Kitchen in China

2011 ◽  
Vol 374-377 ◽  
pp. 1100-1105 ◽  
Author(s):  
Xiao Tan Hou ◽  
An Gui Li ◽  
Zhi Hua Wang ◽  
Yu Jiao Zhao
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Numerical Study ◽  
Average Concentration ◽  
Energy Utilization ◽  
Change Rate ◽  
Air Supply ◽  
Air Change Rate

Indoor air quality of commercial kitchen is investigated and analyzed through velocity, temperature, humidity, and CO2 concentration under different air change rate and supply air temperature. the best air change rate is 30 times per hour and air supply temperature is 301.15K for kitchen, the mean value of the minimum velocity and standard deviation is 0.410m/s and 0.129 respectively, the maximum of the average concentration of CO2 is 659.78ppm, which is less than the acceptance criteria (CO2<1000ppm), and the energy utilization coefficient is maximum of 1.352. Research results show that this air supply mode can optimize indoor air quality.

scholarly journals Solution of Bullet Proof Wooden Frame Construction Panel with a Built-In Air Duct

Buildings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 30
Author(s):  
Anatolijs Borodinecs ◽  
Aleksandrs Geikins ◽  
Elina Barone ◽  
Vladislavs Jacnevs ◽  
Aleksejs Prozuments
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Construction Materials ◽  
Modular Construction ◽  
Construction Time ◽  
Wooden Frame ◽  
Air Supply ◽  
Personal Productivity ◽  
Frame Construction

The growing terrorism threats across the world play an important role in the design of civil buildings and living areas. The safety of personnel is a top priority in unclassified buildings, especially military buildings. However indoor air quality and thermal comfort has a direct impact on personal productivity and ability to concentrate on duties and affect the decision making in stress conditions. The use of wooden structures is becoming more common in the building construction, and application of wooden frame structures for the construction of new buildings as well as for retrofitting the existing buildings. Prefabricated wooded frame construction perfectly fits need of unclassified buildings, allowing significant reduction of construction time and integration of various active and passive elements, such as a fresh air supply duct. Within the scope of this paper a 12 mm thick ballistic panel made of aramid was tested. Ballistic panel, thermal conductivity, and fire resistance of wooded construction panel with embedded air duct were analyzed for the various modelled exterior wall solutions. The main advantage of the proposed technology is fast and qualitative modular construction of unclassified buildings, providing all modern requirements not only for safety, but also for the energy efficiency and indoor air quality. It was found that bullet proof aramid panels do not reduce overall fire safety in comparison to traditional construction materials. However embedded outdoor air supply ducts significantly reduces construction heat transfer coefficient.

scholarly journals The use of modern technologies in carbon dioxide monitoring

2017 ◽  
Vol 12 (2) ◽  
pp. 129-137
Author(s):  
Petr Komínek ◽  
Jan Weyr ◽  
Jiří Hirš
Keyword(s):  
Carbon Dioxide ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Web Application ◽  
Indoor Environment ◽  
Key Factors ◽  
Smart Meters ◽  
Air Supply

Abstract Indoor environment has huge influence on person’s health and overall comfort. It is of great importance that we realize how essential indoor air quality is, considering we spend on average as much as 90% of our time indoors. There are many factors that affect indoor air quality: specifically, inside air temperature, relative humidity, and odors to name the most important factors. One of the key factors indicating indoor air quality is carbon dioxide (CO2) level. The CO2 levels, measured in prefab apartment buildings, indicates substantial indoor air quality issues. Therefore, a proper education of the occupants is of utmost importance. Also, great care should be directed towards technical and technological solutions that would ensure meeting the normative indoor environment criteria, especially indoor air CO2 levels. Thanks to the implementation of new emerging autonomous technologies, such as Internet of Things (IoT), monitoring in real-time is enhanced. An area where IoT plays a major role is in the monitoring of indoor environment. IoT technology (e.g. smart meters and sensors) provide awareness of information about the quality of indoor environment. There is a huge potential for influencing behaviour of the users. Through the web application, it is possible to educate people and ensure fresh air supply.

scholarly journals A Graphical Tool to Estimate the Air Change Efficiency in Rooms with Heat Recovery Systems

2020 ◽  
Vol 12 (3) ◽  
pp. 1031
Author(s):  
Alberto Meiss ◽  
Miguel Ángel Padilla-Marcos ◽  
Irene Poza-Casado ◽  
Antonio Álvaro-Tordesillas
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Heat Recovery ◽  
High Efficiency ◽  
Reference Value ◽  
Reliable Estimate ◽  
Air Supply ◽  
Graphical Tool ◽  
Perfect Mixing

Indoor air quality in buildings must be guaranteed for the health and comfort of the occupants. In order to assess the ventilation strategy of a considered room, the parameter of the air change efficiency ( ε a ) can be used. The objective of this work is to provide designers with a graphical tool for a reliable estimate of the value of ε a of a room. The temperature gradient between the outdoor air supply and the indoor air is so low that the ventilation flow can be assumed as isothermal when high-efficiency heat recovery systems are used. By means of charts, the optimal location of the openings for a better ε a can be determined during the design process, in order to subsequently apply them. It is concluded that it is very important to consider the ε a in the case of openings located in facing walls given that its range varies between 40% and 65%. In contrast, its use can be obviated in the case of openings located in non-facing walls, as the value of ε a obtained is close to 50%; this means a perfect mixing air flow pattern, which is the reference value for the estimation of the indoor air quality (IAQ) in the different national regulations.

scholarly journals Feasibility of a Passive Ventilation System with a Thermal Damper - Simulations and measurement results of an experimental house in a mild region of Japan -

2019 ◽  
Vol 111 ◽  
pp. 06047
Author(s):  
Motoya Hayashi ◽  
Hoon kim ◽  
Yoshinori Honma ◽  
Junichiro Matsunaga
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Ventilation System ◽  
Indoor Environments ◽  
Air Supply ◽  
Measurement Results ◽  
Simulation Results ◽  
Ventilation Rates ◽  
Ventilation Systems

In order to retain good indoor air quality through the year in detached houses with passive ventilation systems, the authors investigated a mechanical control air-supply method. Firstly, indoor environments in houses with passive ventilation systems with thermal dampers, were examined using a simulation program (Fresh). Secondly, a passive ventilation system with a thermal damper, an under-floorheating system with a heat pump and were installed in an airtight house at Maebashi in Japan and measurements on its ventilation characteristics and indoor air quality were made. The simulation results showed that if the thermal damper is well tuned, this mechanically controlled air-supply opening keeps ventilation rates adequate through the year especially in airtight houses. The measurement results showed that the ventilation rates were kept above the required level through the year and the TVOC concentration decreases from 3000 to 200 μg/m3 in 5 months after the construction.

scholarly journals Effects of the COVID-19 Pandemic on Indoor Air Quality and Thermal Comfort of Primary Schools in Winter in a Mediterranean Climate

2021 ◽  
Vol 13 (5) ◽  
pp. 2699
Author(s):  
Alicia Alonso ◽  
Jesús Llanos ◽  
Rocío Escandón ◽  
Juan J. Sendra
Keyword(s):  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Primary Schools ◽  
Indoor Environmental Quality ◽  
Indoor Environments ◽  
Thermal Discomfort ◽  
Air Supply ◽  
Hybrid Ventilation

Research studies have shown the potential effects of indoor environmental quality (IEQ) on pupils’ health and academic performance. The COVID-19 pandemic has prompted renewed interest in the assessment of deficient indoor air quality (IAQ) conditions in schools and has become a priority over achieving adequate comfort conditions. Scientific studies confirm aerosols as one of the transmission routes of SARS-CoV-2 so that the possibility of airborne transmission increases in indoor environments with high occupancy, such as classrooms. As a result, international protocols and guidelines have established a requirement for educational buildings to over-ventilate with a fresh outdoor air supply. The main object of this work is to analyse the effects of the COVID-19 pandemic on thermal comfort and indoor air quality, in winter, in two classrooms of southern Spain. Thus, onsite measurements of environmental variables were conducted before and during the pandemic. Both classrooms have mechanical ventilation systems as they are within a recently built primary school (2018). Results shows a decrease of 300 ppm in CO2 weekly average values during the pandemic, when hybrid ventilation is used, and a decrease of 400 ppm when schools are naturally ventilated during all teaching hours. However, the analysis of standards shows that over 60% of hours are thermal discomfort conditions.

scholarly journals Indoor air quality in multifamily buildings

2013 ◽  
Vol 12 (3) ◽  
pp. 067-074
Author(s):  
Marek Telejko ◽  
Ewa Zender – Świercz ◽  
Jerzy Piotrowski
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Natural Ventilation ◽  
Air Supply ◽  
Air Stream ◽  
Multifamily Buildings

The applicable legislation connected with the natural ventilation are ambiguous and sometimes contradictory. This leads to serious problems with natural ventilation. In most cases malfunction of the natural ventilation is due to the insufficient stream of air from the outside. The research showed that the microclimate is influenced not only by the incoming air stream, but also by the layout of the air supply.

scholarly journals Effect of Air Supply Mode on Indoor Air Quality Using Fresh Air System

2018 ◽  
Vol 175 ◽  
pp. 04014
Author(s):  
Zhen Gao ◽  
Qiang Wang ◽  
Haowei Hu ◽  
Guotao Zhu ◽  
Bingzhan Ren ◽  
...  
Keyword(s):  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Thermal Environment ◽  
Air Inlet ◽  
Air Supply ◽  
Air System ◽  
Supply Mode ◽  
Indoor Comfort

The different ways of fresh air into the indoor, different forms of organization, will affect the indoor comfort. Meanwhile, it can affect the quality of indoor air. The test of the fresh air system mainly involves the indoor temperature and humidity with and without return air. Based on various air organization conditions, the best scheme is put forward. In this work, the influence of the air inlet location on the indoor air quality is studied, and the indoor thermal environment of the room is optimized under the condition of the fresh air supplied.

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