Tags: HVAC Ventilation

HVAC Ventilation Air Volume

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HVAC Ventilation Air Volume

The volume of air required is determined by the size of the space to be ventilated and the number of times per hour that the air in the space is to be changed. Table 3-4 shows the recommended rate of air change for various types of spaces. In many cases, existing local regulations or codes […]

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HVAC Ventilation Ventilator Capacity

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HVAC Ventilation Ventilator Capacity

Several factors must be taken into consideration in selecting the proper ventilator for any specific problem: ? Mean temperature difference ? Stack height (chimney effect) ? Induction effect of the wind ? Area of ventilator opening Of several other minor factors, only one requires close attention. This is the area of the inlet air openings […]

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HVAC Ventilation Natural Ventilation

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HVAC Ventilation Natural Ventilation

The two natural forces available for moving air through and out of buildings are wind forces and temperature difference between the inside and the outside. Air movement may be caused by either of these forces acting alone, or by a combination of the two, depending on atmospheric conditions, building design, and location. Wind forces In […]

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HVAC Ventilation Air Leakage

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Air leakage caused by cold air outside and warm air inside takes place when the building contains cracks or openings at different levels. This results in the cold and heavy air entering at low levels and pushing the warm and light air out at high levels; the same draft takes place in a chimney. When […]

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HVAC Ventilation Requirements

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Ventilation is produced by two basic methods: natural and mechanical. Natural ventilation is obtained by open windows, vents, or drafts, whereas mechanical ventilation is produced by the use of fans. Thermal effect is possibly better known as flue effect. Flue effect is the draft in a stack or chimney that is produced within a building […]

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