scholarly journals The Required Amount of Ventilation Air for the Classroom and the Possibility of Air Infiltration through the Windows

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7537
Author(s):  
Piotr Lis ◽  
Anna Lis
Keyword(s):  
Mechanical Ventilation ◽  
Urban Population ◽  
Heat Recovery ◽  
Main Issue ◽  
School Buildings ◽  
Air Leakage ◽  
Air Infiltration ◽  
Technical Requirements ◽  
Leakage Coefficient

The majority of education buildings in Poland are equipped with natural (gravity) ventilation, where the air inflow depends on the level of window airtightness. A complete statistical urban population of 50 school buildings in Czestochowa have been examined. The main issue to be clarified is the answer to the following questions: Is it theoretically possible to supply enough air to meet the ventilation requirements with gravity ventilation? What is the airtightness of the windows at which it will be possible? The average technical conditions of windows in the analysed buildings were bad. However, only in the case in which high external air leakage coefficient a = 7.0 m3/(h m daPa2/3) (q100KL = 32.4912 m3/(h m) is the amount of air passing through the leaks similar to the quantitative ventilation requirements for classrooms. The quantity of air flowing from the outside through modernized windows that meet the technical requirements (a = 0.6 to 1.0 m3/(m h daPa2/3)) covers on average only about 12% and about 21% of the ventilation needs. Without installing additional vents in the rooms, or better yet, installing mechanical ventilation with heat recovery, meeting the ventilation norm requirements will be impossible.

scholarly journals Yearly Heat Loss Analysis of a Heat Recovery Ventilator Unit for a Single-Family House in St. John’s, NL, Canada

2019 ◽  
Vol 3 (5) ◽  
Author(s):  
Rabbani Rasha ◽  
M. Tariq Iqbal
Keyword(s):  
Energy Consumption ◽  
Heat Loss ◽  
Heat Recovery ◽  
Ventilation System ◽  
Single Family ◽  
Loss Analysis ◽  
Increase Energy Efficiency ◽  
Electricity Cost ◽  
Air Infiltration ◽  
Detached House

This paper represents an energy consumption and heat loss analysis of a heat recovery ventilator unit in a single-family detached house in St. John’s, NL, Canada. An energy-efficient house is a growing attraction to control the air infiltration, provide a comfortable environment with reduced yearly electricity cost. A mechanical induced ventilation system is inevitable to increase energy efficiency and to reduce greenhouse gas emissions of the house in order to supply fresh air. A heat recovery ventilator (HRV) is an air to air heat exchangers that recovers heat from inside of the house and delivers this preheated and fresh air to the space for maintaining the occupant’s comfort. In this paper, yearly energy consumption with the heat loss of a typical heat recovery ventilator unit is presented. MATLAB, BE opt, and Microsoft Excel are used to do all necessary simulation with calculation using one-year logged data. Methodology, results with graphs and detailed analysis of this research are included in this paper. This research indicates that the cost of running a HRV for a year in a house in St. John’s could be as high as $484 per year with an unknown air quality improvement.

Air leakage during nocturnal mechanical ventilation in patients with neuromuscular disease

ITBM-RBM ◽  
2006 ◽  
Vol 27 (5-6) ◽  
pp. 227-232 ◽  
Author(s):  
A. Sabil ◽  
G. Mroue ◽  
H. Prigent ◽  
D. Orlikowski ◽  
M. Bohic ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Neuromuscular Disease ◽  
Air Leakage

The use of mechanical ventilation with heat recovery for controlling radon and radondaughter concentrations in houses

1981 ◽  
Vol 15 (3) ◽  
pp. 263-270 ◽  
Author(s):  
W.W. Nazaroff ◽  
M.L. Boegel ◽  
C.D. Hollowell ◽  
G.D. Roseme
Keyword(s):  
Mechanical Ventilation ◽  
Heat Recovery

Determine Coverlay Thickness According to Air Leakage Characteristics in Open Pit to Underground Overlay

2012 ◽  
Vol 567 ◽  
pp. 88-91
Author(s):  
Chen Chao ◽  
De Qing Gan ◽  
Ling Qi Zhu ◽  
Ya Bin Zhang ◽  
Hong Jian Lu
Keyword(s):  
Theoretical Basis ◽  
Open Pit ◽  
Air Leakage ◽  
Capping Layer ◽  
Analogue Simulation ◽  
Iron Mine ◽  
Leakage Coefficient ◽  
Leakage Characteristics ◽  
Laboratory Analogue ◽  
The Relationship

During surface-underground combined mining, the method to control the ground air leakage is adopted by the capping layer using the fragmented rocks and the discarded tailings. In order to study the air leakage characteristic with the capping, the porosity of the rock particles of seven sizes and the air leakage characteristics of the capping were studied and the relationship between the air leakage coefficient and amount of air leakage with the capping height were found basing on the laboratory analogue simulation tests. It can provide the theoretical basis for determining the capping height of iron mine.

scholarly journals Experimental Performance Analyses of a Heat Recovery System for Mechanical Ventilation in Buildings

2015 ◽  
Vol 82 ◽  
pp. 465-471 ◽  
Author(s):  
Francesco Asdrubali ◽  
Giorgio Baldinelli ◽  
Francesco Bianchi ◽  
Matteo Cornicchia
Keyword(s):  
Mechanical Ventilation ◽  
Heat Recovery ◽  
Experimental Performance ◽  
Recovery System ◽  
Heat Recovery System ◽  
Performance Analyses

Air infiltration through building envelopes: A review

2011 ◽  
Vol 35 (3) ◽  
pp. 267-302 ◽  
Author(s):  
Chadi Younes ◽  
Caesar Abi Shdid ◽  
Girma Bitsuamlak
Keyword(s):  
Indoor Air ◽  
Energy Demand ◽  
Building Energy ◽  
Building Envelope ◽  
Energy Costs ◽  
Air Leakage ◽  
Building Envelopes ◽  
Air Infiltration ◽  
Considerable Impact ◽  
Evaluation Techniques

Air leakage through the building envelope into the building interiors has a considerable impact on the energy loads and consequently energy demand and energy costs of buildings. This phenomenon known as infiltration happens through various openings and venues in the building envelope varying from large openings such as doors and windows to minute cracks and crevices. In addition to impacting building energy loads, infiltration impacts indoor air quality and can result in moisture accumulation problems in the building envelope. A generalized review of infiltration that includes evaluation techniques and models, quantification, and interaction with other heat transfer phenomena is presented in this article.

scholarly journals Non-Intrusive Measurements to Incorporate the Air Renovations in Dynamic Models Assessing the In-Situ Thermal Performance of Buildings

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 37
Author(s):  
María José Jiménez ◽  
José Alberto Díaz ◽  
Antonio Javier Alonso ◽  
Sergio Castaño ◽  
Manuel Pérez
Keyword(s):  
Mechanical Ventilation ◽  
Reference Values ◽  
Dynamic Models ◽  
Measurement Techniques ◽  
Co2 Concentration ◽  
Air Leakage ◽  
Tracer Gas ◽  
Gas Measurements ◽  
Different Levels

This paper reports the analysis of the feasibility to characterise the air leakage and the mechanical ventilation avoiding the intrusiveness of the traditional measurement techniques of the corresponding indicators in buildings. The viability of obtaining the air renovation rate itself from measurements of the concentration of the metabolic CO2, and the possibilities to express this rate as function of other climatic variables, are studied. N2O tracer gas measurements have been taken as reference. A Test Cell and two full size buildings, with and without mechanical ventilation and with different levels of air leakage, are considered as case studies. One-month test campaigns have been used for the reference N2O tracer gas experiments. Longer periods are available for the analysis based on CO2 concentration. When the mechanical ventilation is not active, the results indicate significant correlation between the air renovation rate and the wind speed. The agreement between the N2O reference values and the evolution of the metabolic CO2 is larger for larger initial values of the CO2 concentration. When the mechanical ventilation is active, relevant variations have been observed among the N2O reference values along the test campaigns, without evidencing any correlation with the considered boundary variables.

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