Panasonic PAW280MAH2 Instrukcje Operacyjne Pobierz pdf (Strona 13)

Ventilation theory and air handling units

In most cases, the pressure in ventilated spaces is equal to the atmospheric pressure of the

outside. This means that the air-ow delivered to a space equals the airow brought back from a

space. Such spaces are described as neutral or balanced.

However, in mechanical ventilation systems the supply air and return air ows might be

sized differently, when necessary. In these cases, a building can be either pressurized or

depressurized:

● Pressurized:

The pressure within the ventilated space is positive (higher) compared to the

outside pressure. This means, a certain amount of air is exltrated from the

space through openings and cracks.

Examples are clean rooms, operation theatres etc.

● Depressurized:

The pressure within the ventilated space is negative (lower) compared to the

outside pressure. This means, a certain amount of air is inltrated to the space

through openings and cracks.

Examples are kitchens, toilets, laboratories working with toxic substances etc.

2.4 Air handling units

Main components of air handling units

The main components of an air handling unit are shown in the following graphic.

Mixed air (MA)

Supply air fan

(SAF)

Supply air

(SA)

Outside air

(OA)

Return air

(RA)

Exhaust air

(EA)

Dampers

(D)

Dampers

(D)

Dampers

(D)

Cooling Coil

(CC)

Heating Coil

(HC)

Air handling unit (AHU)

Filter

(F)

Recirculated

air (CA)

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 73 74

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Panasonic PAW280MAH2 Instrukcje Operacyjne Strona 13

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