Sampling time of particle counter

SDICH-P-600

perforated swirl diffuser

DOP is banned due to carcinogenic effet

MNC compny mean?

Multi national company

1 Like

AHU is Air Handling Unit.
there are two types of cooming mechanism.
Dx type Direct Expenson
Chilled Water System
In Dx type Refgrent gases are used to cool the air.
In chilled watr systm watr is chilled in chiller then travel by pipes to AHU and cool the air in Cooling coils

Dx type are costly and chances of gas leakage are more.
Dx type is effecient for short distance.
Mostly chiled water system is used.Suitable for long distance.

1 Like

Pre filters
Bag filters
HEPA

Dampers are air controlrs.air passage can be increased or decreased by opening or clossing dampers.In BMS damprs are controlled by the computer system.

yes but better to instal in terminal

images(1)

Air is cooled by chilled water supply in cooling coil.

How air is heated in AHU?

How much % of fresh air is taken by AHU?

Two methods of heating.
Direct heating
in this heating rods or coils are used to heat air.
Indirect heating
boiler is used to boil the water which then circulates throu pipes n heat air

It depends upon area of work.
usually 10-15 percent fresh air is used.
For dangerous fumes work area all air goes through exhaust and new fresh air is taken.
Coast of system is increased as the amount of fresh air increases.

1 Like

Hou dehumidification take place in AHU?

dehumidifier is used.

The heart of these dehumidifiers is a patented desiccant wheel made up of Honeycomb material. Air passes through the Honeycomb Desiccant. The incoming process air stream gives off its moisture to the desiccant. The process air is dry as it leaves the wheel. The humidity-laden wheel rotates slowly into a second, smallerairstream which has been heated. The smaller airstream is known as reactivation air which warms the desiccant. The warmed desiccant gives off its moisture which is then carried away by the reactivation air. The newly dried desiccant material is rotated back into the process air, where it absorbs moisture once again.

1 Like

how humidificatin take place in AHU?if required