McQuay MDS080BR Installationsanleitung PDF herunterladen (Seite 62)

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Design & installation Guide For McQuay MDS Multi System

Acceptable (CO

) density

Room type

Acceptable CO

density

L/m

g/kg

Place where people stay for a long time 1 1.5

Place where children and patients stay 0.7 1.0

Place where people stay

1.25 1.75

regularly (government agency)

Place where people stay for a short time

2 3.0

In actual practice, the fresh air volume is generally 30m

/h person or more, no matter how

much room space a person occupies.

For densely populated buildings, such as air conditioned gymnasiums and meeting rooms, as

the room space per capita is less and every one stays shorter, the fresh air volume can be

calculated on a basis of 7-15m

/h.person. However, as the fresh air volume got by this way will

count for 30% to 40% of the total air volume and it will greatly affect the cooling capacity, you must

be careful in deciding it.

Supplementary of air discharge

When the air conditioned room has an exhaust system, the air conditioning system must

have corresponding fresh air volume to complement the exhaust volume. Generally, it is

recommended to use an exhaust volume that is 80% of the fresh air volume for comfortable

air conditioning.

Keeping the air conditioned room in positive pressure

To prevent outside air (those from outdoor and adjacent rooms with less strict air condition-

ing requirements) from penetrating the room and affecting the temperature/humidity or the

cleanness of the air conditioned room, the air conditioning system needs to use a certain

volume of fresh air to keep the room in

positive pressure , that is, the atmospheric

pressure of the room is higher than that of outside). Generally, the indoor positive pressure

is 5 0 Pa. Too high positive pressure not only is a waste, but also makes the system run

less cost-effectively. In actual engineering design, the fresh air flow should count for 10%

or more of the total inlet to guarantee the air is healthy and comfortable.

Introduction of fresh air

The inlet of fresh air should be at a clean place outdoor. It should be away from the air

discharge outlet and leeward to smoke, dust, and other harmful and toxic sources.

To avoid dust, the fresh air inlet should be at least 2m above the ground, or 1m above the

ground if it is placed in a green belt.

To introduce less hot air from outdoor in the summer, the inlet should be placed at the shade

side of the building.Generally, it is placed on the northern wall, not at the roof or on the west

wall.

Configure waterproof shutters, metal web, and air flow adjustment valves to fresh air inlet

if necessary.

To guarantee the quality of the introduced fresh air and the ambient temperature, do not

place the fresh air inlet near to the outdoor unit which has a condenser or put it near to the

exhaust outlet.

Generally, the size of the fresh air inlet depends on the air volume and air speed. For the

air speed, refer to Annex 4.

Note

For heat pump unit, you should consider the effects of layer height to the air conditioning effects.

When the layer height is 3m or more, you should select an appropriate air inlet to improve the air

flow pattern and the blown-in air flow.

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