Experimental Measurements of a Carbon Dioxide Concentration for Determining of a Ventilation Intensity in a Room at Pulsing Mode

Abstract

Air distribution by interaction of counter non coaxial air jets at pulsing mode has been considered. Dynamic parameters of air flow that is created due to interaction of counter non coaxial flat air jets at their leakage at pulsing mode and creation of dynamic indoor climate in a room has been determined. This paper is aimed to develop a methodology for determining the intensity of ventilation of indoor premises based on the experimental measurements of the concentration of carbon dioxide. Using experimental measurements and the knowledge gained in the study of this issue, in the work the method for intensity ventilation determining of the indoor premises was developed on the basis of the measured values of carbon dioxide which was verified also by another experimental measurements. The resulting values of ventilation intensity rate obtained by calculation from the measured values of carbon dioxide were compared with the results of calculations executed according to the laws and standards, valid in Slovakia. Based on measured values of carbon dioxide concentrations a method for calculation of the ventilation intensity was developed and compared with the methods used in Slovakia.

RETRACTED: Analysis of Various Ventilation Systems Due to the Quality of Indoor Air in Educational Buildings

“…Increasing the tightness of rooms worsens the operation of the ventilation system, which reduces heat loss through ventilation and reduces the heating costs of the building. This ultimately results in a significant deterioration of air quality in the teaching rooms [6][7][8].…”

Ensuring comfort microclimate in the classrooms under condition of the required air exchange

“…Parameters of the device were as follows: measurement of CO 2 concentration in the range from 0 to 10000 ppm, accuracy of measurement of CO 2 concentration was ±3 ppm [18][19][20][21].…”

Modeling of air flow in industrial rooms

“…As characteristic property of such incoming air jet there is its higher turbulence in comparison with common air jets [7,8,9]. Both swirl and laying air jets using is an effective way of increasing its turbulence [10,11].…”

“…where: T -temperature, (K); ε 3 С -constant (-), that determines influence degree of pushing force on ε : (11) where: v′ , u′ -components of air velocity, (m/s), that accordingly are parallel and normal to gravity velocity; YM -contribution of variable widening at press turbulence into common velocity of dissipation: Constants else: 44 ,…”