scholarly journals Considerations About the Required Volumetric Air Flow Rate Inside an Office Room with One Occupant – Case Study

2020 ◽  
Vol 10 (1) ◽  
pp. 31-38
Author(s):  
P. Kapalo ◽  
F. Domniţa ◽  
O. Pop ◽  
M. Adamski ◽  
O. Voznyak
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Accurate Determination ◽  
Minimum Energy ◽  
Volumetric Flow Rate ◽  
Precise Determination ◽  
Air Flow Rate ◽  
Minimum Energy Consumption ◽  
Body Parameters

AbstractIn the construction process of modern buildings, the aim is to achieve maximum comfort within minimum energy consumption. One of the ways to achieve this requirement is the accurate determination of the volumetric flow rate of fresh air, necessary to ensure the required indoor air quality. This study begins with the experimental determination of carbon dioxide (CO2) concentration in an office room with one occupant performing three types of activities with different levels of physical intensities. Based on these measurements, a methodology for the precise determination of the volumetric air flow rate is presented. This method was compared with another one that takes into account body parameters and is considered in this study as the most accurate. The required outdoor air flow rate for the experimental room was also determined based on the present legislations of five different countries. Comparing all the studied methods and considering as refence the method based on body parameters, it was found that the accuracy of the values is influenced by the physical intensity of the activity and that most methods generally underestimate the amount of required fresh air.

Determination of optimal air flow rate in air drilling

1992 ◽  
Vol 8 (1) ◽  
pp. 1-11
Author(s):  
Michael A. Adewumi ◽  
Shifeng Tian
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Air Flow Rate ◽  
Air Drilling

scholarly journals Investigations of hydraulic operating conditions of air lift pump with three types of air-water mixers

2015 ◽  
Vol 47 (1) ◽  
pp. 69-85 ◽  
Author(s):  
Marek Kalenik
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Air Flow ◽  
Operating Conditions ◽  
Water Delivery ◽  
Air Flow Rate ◽  
Analysis Of Results ◽  
Delivery Pipe ◽  
Air Lift

Abstract: Investigations of hydraulic operating conditions of air lift pump with three types of air-water mixers. The paper presents the analysis of results of the investigations concerning the influence of various constructive solutions of the air-water mixers on hydraulic operating conditions of the air lift pump. The scope of the investigations encompassed the determination of characteristics of delivery head and delivery rate for three types of air-water mixers applied in the constructed air lift pump. Using the obtained results, the efficiency of the three types of air-water mixers applied in this air lift pump was determined. The analysis was carried out and there was checked whether the improved analytical Stenning-Martin model can be used to design air lift pumps with the air-water mixers of these types. The highest capacity in the water transport was reached by the air lift pump with the 1st type air-water mixer, the lowest one – with the 3rd type air-water mixer. The water flow in the air lift pump increases along with the rise in the air flow. The lower are the hydraulic losses generated during flow of the air flux by the air-water mixer, the higher is the air lift pump capacity. Along with the rise in the water delivery head, the capacity of the air lift pump decreases. The highest efficiency is reached by the air lift pump with the 1st type air-water mixer, the lowest – with the 3st type air-water mixer. The efficiency of the air lift pump for the three investigated types of air-water mixers decreases along with the rise in air flow rate and water delivery head. The values of submergence ratio (h/L) of the delivery pipe, calculated with the use of the improved analytical Stenning-Martin model, coincide quite well with the values of h/L determined from the measurements.

Standardized On-line Method to Quantify the Air Flow Rate for Determination of Emissions in a Broiler House

2005 ◽  
Author(s):  
R. Kosch ◽  
R. Neumeier ◽  
H. Arnold ◽  
A. Schwarz ◽  
H. Van den Weghe
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Air Flow Rate ◽  
Line Method ◽  
On Line ◽  
Broiler House

scholarly journals A cataluminescence sensor for the detection of trichloroethylene based on PEG200/ZnO nanocomposite

2020 ◽  
Vol 212 ◽  
pp. 02004
Author(s):  
Xinli Cai ◽  
Fei Liu ◽  
Fakang Pan ◽  
Bai Sun ◽  
Fangwen Xu ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Flow Rate ◽  
Air Flow ◽  
Health And Safety ◽  
Human Beings ◽  
Air Flow Rate ◽  
Reaction Conditions ◽  
Volatile Organic ◽  
New Type

The content of volatile organic compounds (VOCs) in the atmosphere will endanger the health and safety of human beings which makes it very important to develop a simple and rapid method for the determination of gas pollutants. Based on this, a new type of gas sensor was proposed for the detection of trichloroethylene in air. PEG200/ZnO nanocomposite were prepared by hydrothermal method. The materials were characterized by scanning electron microscope, X-ray energy spectrum and fourier infrared spectrum. The high selectivity of the materials was verified by using the cataluminescence (CTL) intensity of 9 kinds of VOCs on the surface of the materials as a reference. The results show that trichloroethylene can produce CTL response on the surface of PEG200/ZnO nanocomposite. Temperature, air flow rate and detector concentration all have certain effects on the CTL intensity. By comparing the CTL intensity under different reaction conditions, it is found that the suitable temperature and air flow rate are 120 °C, 180 mL/min and there is a good linear relationship between the relative CTL intensity and the concentration of the detected substance (y = 28.588 x - 285.56, R=0.9593). The gas sensor has the advantage of rapid response, and trichloroethylene can produce the maximum CTL on the surface of the material within 3 ~ 5 s.

scholarly journals The Air Flow Distribution in the Overpressure Sowing Apparatus

2020 ◽  
Vol 14 (1) ◽  
pp. 40-45
Author(s):  
A. Yu. Popov
Keyword(s):  
Flow Velocity ◽  
Flow Rate ◽  
Air Flow ◽  
Flow Distribution ◽  
Volumetric Flow Rate ◽  
Air Velocity ◽  
Air Flow Velocity ◽  
Flow Propagation

To improve the quality of the pneumatic sowing apparatus, it is necessary to study its aerodynamics. (Research purpose) Determination of air flow distribution in the upper part of the seed chamber of the sowing apparatus, taking into account the protrusions of the sowing disk, on which the quality of seeds dosing depends. (Materials and methods) The author chose a sowing apparatus operating at overpressure as an object of research. The author showed that the seed chamber constant sealing in it is provided by the protrusions of the sowing disk, which are made with cut edges on the side of the sowing disk metering element in two planes. The author applied computer simulation of the sowing apparatus. To conduct a numerical experiment, the initial and boundary conditions were determined, and the rotation of the seed disk was taken into account. The calculation of the model was carried out by changing the volumetric air flow in the range of 15-35 liters per second. (Results and discussion) The author constructed isolines of the air velocity distribution at various air flow rates. He determined the values of the air flow in the directions X, Y and Z in the sowing apparatus seed chamber. It was revealed that the largest and the smallest values of this indicator are achieved at 35 and 25 liters per second respectively. It was shown that at an air flow rate in the range of 15-25 liters per second, the distribution of the air flow in the upper part of the seed chamber would be optimal for transporting the seeds with a metering element. The air flow velocity components in Z direction vary in the range from 5.4 to 16.5 meters per second, and in the X and Y directions do not exceed 8 meters per second. (Conclusions) Based on simulation modeling, the author constructed and analyzed graphs of air flow velocity components changes in the three directions of air flow propagation. He determined the nature of the distribution of air flow in the excess seeds discharge area in the design of protrusions with cut corners. He proposed a rational range of air volumetric flow rate of 15-25 liters per second.

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