Air volume

Humid volumes are given by the curves entitled Volume mVkg diy air. The volumes are plotted as func tions of absolute humidity and temperature. The difference between dry-air specific volume and humid-air volume at a given temperature is the volume of water vapor. 

In the Agitair Rotation machine (Fig, 19-76), the impeller is a Rat rubber-covered disk with steel Fingers extending downward From the peripheiw, A rubber-covered stabilizer eliminates dead spots in the agitation zone and improves biibble-ore contact. The degree oF aeration is controlled bv regulating air volume on each cell with an individual air v alv e. Air is supplied at 10 x lO Pa (1,5 IbF/iir),... 

Fluidized-bed opposed-jet mills Hosokawa Micron Powder Systems Div.) differ from the Majac mill in that powder is not fed into the jets, but the jets impinge into a chamber mich contains suspended powder. The powder is entrained into the jets. This ehminates wear on the nozzles, and reduces contamination. Otherwise, construction and appheations are similar to the Majac mill. The fluidized-bed level is maintained a few inches above the jets. The Fluidized-bed mill is available in 13 sizes with air volumes ranging from. 50 to 11,000 mVh. One application is for toner grinding. 

Turn now to Nomograph 2 and locate in their respective scales the air volume and the calculated system capacity. A straight line between these two points intersects the scale in between them, thus providing at the intersection point the value of the solids ratio, if the sohds ratio exceeds 15, assume a larger hue size. 

Locate in Nomograph 3 the pipe diameter and the air volume found in Nomograph 1. A hue between these two points yields the... 

In contrast, variable air volume (VAV) systems condition supply air to a constant temperature and ensure thermal comfort by varying the airflow to occupied spaces. Most early VAV systems did not allow control of the outdoor air quantity, so that a decreasing amount of outdoor air was provided as the flow of supply air was reduced. More recent designs ensure a minimum supply of outdoor air with static... 

A secondary fan draws the air and forces it through the secondary heat exchanger, where the reduced air volume temperature is raised to the required desorption temperature. The preheated air is then used to desorb the air in one portion of the wheel. As the air exits the desorption section the organic concentration is approximately 10 times the concentration of the original process stream. This low volume, higher concentration stream then enters the induced draft section of a catalytic or thermal recuperative oxidizer, where the organics are destroyed. 

Conical fixed-bed adsorbers are used when a low pressure drop through the cone-shaped bed is less than one half of that through a conventional flat-bed adsorber, while the air volume is more than double that through the flat bed. 

Cl = Lower explosive limit concentration of flare gas in air, volume fractions... 

Pressure and humidity have also an effect on the mass flows. We continue Examples 2a and 2b by calculating the dry air mass flow in a fan when the humid air volume flow in the fan is 0.8 m /s. According to Eq. (4.91) and the calculations above, we obtain... 

Forced vital capacity (FVC) quantifies the maximum air volume expired following a maximal inspiration and is one of the basic measures of analyzing flow changes such as reduced airway patency observed in asthma. To measure FVC, an individual inhales maximally and then exhales as rapidly and completely as possible. FVC primarily reflects the elastic properties of the respiratory tract. The gas volume forcibly expired within a given time interval, FEV (where t is typically one second, FEVj q)... 

Figure 7.73 shows a plume in an open environment. The hot air from the source entrains ambient air into the convection current (the plume), thus making the air volume flow increase with height. 

From Table 7.19 we find the air volume flow (, ) in the plume as a function of the height above the floor (z) ... 

Wc can rearrange the equation so that we find the height for a given air volume flow in the plume ... 

Skaret presents a general air and contaminant mass flow model for a space where the air volume, ventilation, filtration, and contaminant emission have been divided for both the zones and the turbulent mixing (diffusion) between the zones is included. A time-dependent behavior of the concentration in the zones with constant pollutant flow rate is presented. 

In order to have effective exchange of air in important locations in a room, the age of the air in those locations should be low. The basis for comparison is the complete mixing scenario. That scenario gives the same age for any air volume selected in the room, identical to the nominal time constant for the ventilation airflow,. A steady-state scenario is assumed. See Sutcliffe for an overview of definitions related to age of air. The various air exchange efficiency indices are presented in Table 8.6. 

A workshop has a fabric and ventilation sensible heat loss of 30 kW, and the process requires that the room be maintained at 22 °C dry bulb. Determine the supply air volume required at 34 "C in order to maintain the space at design conditions. 

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