A simple model to study the influence of fluctuating airflow on the effective air exchange rate when using natural ventilation

2009 ◽  
Vol 2 (1) ◽  
pp. 63-66 ◽  
Author(s):  
Bin Zhao ◽  
Jianlong Zeng
Keyword(s):  
Exchange Rate ◽  
Simple Model ◽  
Natural Ventilation ◽  
Air Exchange Rate ◽  
Air Exchange

scholarly journals Air Exchange Rate in Air Quality Assurance – A Case Study

2018 ◽  
Vol 8 (1) ◽  
pp. 13-18
Author(s):  
I. L. Cîrstolovean ◽  
M. Horneț ◽  
Ana Diana Ancas ◽  
M. Profire
Keyword(s):  
Exchange Rate ◽  
Air Quality ◽  
Heat Load ◽  
Natural Ventilation ◽  
Mechanical Energy ◽  
Ventilation System ◽  
Time Interval ◽  
Indoor Temperature ◽  
Air Exchange Rate ◽  
Air Exchange

Abstract The goals of this paper are to estimate some parameters – indoor temperature and ventilation rate - necessary to determine the heat load demand for ventilation in the amphitheatre named ‘A TALPOSI’-Faculty of Buildings Engineering- with a number of at the most 120 occupants. The study presented in this paper is made when in the amphitheatre it is necessary to assure a comfortable temperature by a permanent functioning of the heating system. The number of air exchanges necessary in the amphitheatre in the natural ventilation process, more exactly, to assure a minimum air exchanges, is imposed by the requirements for the assurance of physiologic comfort in the amphitheatre for the time interval when it is occupied by students. The inner air debit should cover the harmful emissions in the amphitheatre. By the help of these calculated (measured) parameters we have calculated the heat load for ventilation. In the end, with the data obtained from calculations and measurements we find ourselves in the situation of establishing the size of the heat exchanger corresponding to the room, to heat the fresh air taken from outside and send it inside the amphitheatre. The measurements are made with the TESTO apparatus of the faculty. The minimum requirements to assure the thermal comfort are: to achieve a minimum internal temperature θi (t) higher than (or equal to) the normal indoor temperature associated to this space and to assure the air quality, the air exchange rate. The authors want to highlight by this study the necessity and importance of the control on the number of air exchanges in rooms with a high number of occupants and overall, the control of the fresh air debits. The fact that the focus is more and more on heat loss cuts in rooms by tightening closing elements gives birth to the necessity of control of the ventilation system with effects on the consumption of mechanical energy.

Air Exchange across Staircase Windows in Protected Escape Route in Time of Fire

2013 ◽  
Vol 855 ◽  
pp. 215-218
Author(s):  
Martina Reháková ◽  
Imrich Mikolai
Keyword(s):  
Exchange Rate ◽  
Temperature Difference ◽  
Natural Ventilation ◽  
Escape Route ◽  
Wind Action ◽  
Air Exchange Rate ◽  
Rate Calculation ◽  
Air Exchange

The article is focused on the analysis of air exchange by natural ventilation in the staircase area with elevator in the middle as a protected escape route. The article contains three variants of air exchange rate calculation that are based on the effect of the temperature difference and the effect of wind action. The result of these calculations is the verification if the staircase windows provide sufficient air exchange in the protected escape route to ensure the required level of protection for evacuees.

scholarly journals Experimental Study of a natural ventilation strategy in a Full-Scale Enclosure Under Meteorological Conditions: A Buoyancy-Driven Approach

2018 ◽  
Vol 3 (1) ◽  
pp. 657
Author(s):  
Miguel Chen Austin ◽  
Denis Bruneau ◽  
Alain Sempey ◽  
Laurent Mora ◽  
Alain Sommier
Keyword(s):  
Experimental Study ◽  
Exchange Rate ◽  
Natural Ventilation ◽  
Cfd Simulation ◽  
Experimental Studies ◽  
Meteorological Conditions ◽  
Full Scale ◽  
Ventilation Strategy ◽  
Air Exchange Rate ◽  
Air Exchange

The performance of a natural ventilation strategy, in a full-scale enclosure under meteorological conditions is studied through an experimental study, a buoyancy-driven approach, by means of the estimation of the air exchange rate per hour and ventilation power. A theoretical and an empirical model are proposed based on the airflow theory in buildings and blower-door tests. A preliminary validation, by comparing our results with standards in air leakage rate determination, is made. The experimental study conducted here has shown that the natural ventilation strategy implemented reach promising air exchange rate levels, as they are rather high compared to other experimental studies found in the literature.  The proposed models have shown good potential and further analysis should take place. Also, other methods for validating these models should be implemented (for instants: CFD simulation or tracer gas methods), as the one in the standards is rather rough estimations.Keywords: Buoyancy-driven, natural ventilation, ventilation power, blower-door test, airflow in buildings.

DETERMINATION AND ANALYSIS OF AIR EXCHANGE RATE IN A LARGE GREENHOUSE EQUIPPED WITH INSECT PROOF NET

2007 ◽  
pp. 151-160
Author(s):  
H. Majdoubi ◽  
T. Boulard ◽  
A. Hanafi ◽  
H. Fatnassi ◽  
H. Demrati ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Air Exchange Rate ◽  
Air Exchange

Zonal air exchange rate of a passive solar house and resultant sensible air heat transfer

2018 ◽  
Vol 28 (7) ◽  
pp. 914-926 ◽  
Author(s):  
Ochuko Kelvin Overen ◽  
Edson Leroy Meyer ◽  
Golden Makaka ◽  
Sosten Ziuku ◽  
Sampson Mamphweli
Keyword(s):  
Heat Transfer ◽  
Exchange Rate ◽  
Air Exchange Rate ◽  
Passive Solar ◽  
Solar House ◽  
Air Exchange

scholarly journals First steps in the development of a possible measurement method to estimate the radon concentration as an indicator of the indoor air quality

2014 ◽  
Vol 29 (suppl.) ◽  
pp. 52-58
Author(s):  
Franz Roessler ◽  
Jai Azzam ◽  
Volker Grimm ◽  
Hans Hingmann ◽  
Tina Orovwighose ◽  
...  
Keyword(s):  
Exchange Rate ◽  
Air Quality ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Primary Energy ◽  
Air Pollutant ◽  
Daily Routine ◽  
Air Exchange Rate ◽  
Pollutant Concentrations ◽  
Air Exchange

The energy conservation regulation provides upper limits for the annual primary energy requirements for new buildings and old building renovation. The actions required could accompany a reduction of the air exchange rate and cause a degradation of the indoor air quality. In addition to climate and building specific aspects, the air exchange rate is essentially affected by the residents. Present methods for the estimation of the indoor air quality can only be effected under test conditions, whereby the influence of the residents cannot be considered and so an estimation under daily routine cannot be ensured. In the context of this contribution first steps of a method are presented, that allows an estimation of the progression of the air exchange rate under favourable conditions by using radon as an indicator. Therefore mathematical connections are established that could be affirmed practically in an experimental set-up. So this method could provide a tool that allows the estimation of the progression of the air exchange rate and in a later step the estimation of a correlating progression of air pollutant concentrations without limitations of using the dwelling.

Nasal Mucosal Swelling in Relation to Low Air Exchange Rate in Schools

Indoor Air ◽  
1997 ◽  
Vol 7 (3) ◽  
pp. 198-205 ◽  
Author(s):  
Robert Walinder ◽  
Dan Norback ◽  
Gunilla Wieslander ◽  
Greta Smedje ◽  
Claes Erwall
Keyword(s):  
Exchange Rate ◽  
Air Exchange Rate ◽  
Nasal Mucosal Swelling ◽  
Air Exchange

Effective Energy Saving Research on the Air Exchange Rate of Residential Buildings in Guangzhou Based on the Software DeST-h

2011 ◽  
Vol 374-377 ◽  
pp. 430-435
Author(s):  
Wei Wei Du ◽  
Cui Cui Qin ◽  
Li Hua Zhao
Keyword(s):  
Exchange Rate ◽  
Exchange Rates ◽  
Energy Saving ◽  
Residential Buildings ◽  
Linear Regression Analysis ◽  
Functional Relation ◽  
Residential Building ◽  
Saving Rate ◽  
Air Exchange Rate ◽  
Air Exchange

Reasonable determination of indoor ventilation rates are the main content of residential ventilation designs, and can save consumption by air conditioners. Firstly, the energy saving potential of ventilation cooling technology in Guangzhou is analyzed in this paper. The cooling load of a residential building in Guangzhou with different air exchange rates is simulated by the DeST-h after indoor heating quantity of different rooms is set. The energy saving rate is analyzed, the functional relation between energy saving rate of ventilation and air exchange rate is obtained using the linear-regression analysis method. After a comprehensive consideration of various factors, including variation of energy efficiency, room volume, air outlet size, and that the maximum air exchange rates of different rooms are fixed.

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