Abstract
The article presents the regularities of the vertical change in the air temperature of a ventilated room for various purposes, where the excess of sensible heat dominates, in the first case, when there is no process of air flow through the opening in a common vertical fence between the rooms located in a row, or the second case, when a similar air flow is observed. In heat-stressed rooms, the general ventilation arrangement scheme provides for the removal of air from the upper volume of the room. To determine the required air exchange with point, two-zone or multi-zone mathematical models of a ventilated room, it is necessary to have a reliable apparatus for determining the gradient of the vertical air parameters change for a ventilated room. The reasonably determined value of the gradient of the air temperature change along the vertical of the ventilated room makes it possible to calculate the air flow between different volumes inside the ventilated room. Determination of the air temperature near the suction flare makes it possible to determine the required air exchange more reasonably. A method is given for calculating the distribution of air temperature in rooms with an excess of apparent heat over the height of the room in the first case, when there is no process of air flow through the opening in the common vertical fence between the rooms located in a row, or the second case, when a similar air flow is observed. This takes into account the height of the supply air distributors relative to the working (serviced) area. Reasonable determination of the air temperature at different points in the room with an excess of sensible heat allows a correct calculation of the required air exchange. The presented method for determining the gradient of air temperature stratification along the height of the room with air flow between adjacent rooms and without it contributes to the reasonable determination of the air temperature at the suction flame of the exhaust air distributor, which increases the reliability of calculating the required air exchange.
Highlights
IntroductionCases are considered when the supply ventilation stream enters the working (serviced) area from the upper zone of the ventilated room or the ventilation stream enters the working (serviced) area
A heat-intensive room is considered, where the excess of sensible heat with a stationary airthermal regime dominates, with known capacities, with given locations of heat sources, where the supply and exhaust mechanical ventilation system operates, providing a balance in the amount of supply (Gp, kg / h) and extract air (Gu, kg / hour) Gp = Gu
The process of air temperature stratification along the vertical of a ventilated room is influenced by the processes of mixing air inside the room by supply ventilation jets, the processes of infiltration or exfiltration, as well as the flow of air between the rooms located in a row
Summary
Cases are considered when the supply ventilation stream enters the working (serviced) area from the upper zone of the ventilated room or the ventilation stream enters the working (serviced) area. To determine the required air exchange with point, two-zone or multi-zone mathematical models of a ventilated room, it is necessary to have a reliable apparatus for determining the gradient of the vertical air parameters change for a ventilated room. The reasonably determined value of the gradient of the air temperature change along the vertical of the ventilated room makes it possible to calculate the air flow between different volumes inside the ventilated room. Determination of the air temperature near the suction flare makes it possible to determine the required air exchange more reasonably [1–20]
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