Air-Water Systems

Air and water are distributed to spaces. Since (Cp p)water > (Cp p)air, air is supplied for better air quality while water is used to remove heating/cooling load.

Q = cP P(t

Return — TSUpply)

O

Primary air has constant volume > minimum OA required for ventilation. In winter, primary air is heated space temperature and humidifies. In summer, primary air is cooled to dehumidify.

Secondary air is passing through water coil (heat exchanger) before mixing with primary air. Central plant makes hot or cold water that is distributed via piping system to the water coil. The water coil heats/ cools to control space temperature, and does not control humidity.

Filter-/

PREHEAT COIL

INDUCTION UNIT. FAN COIL UNIT.

OR RADIANT PANEL

SOUND

AB50RBER

Ђ7*

SUPPLY FAN — COOLING COIL

Rl

 

‘S

AT

,’K. .t’

>

I

R

RS

W J

 

V!?———————————————————————————————————————

RETURN FAN (IF PR0VI0ED)

 

Air-Water Systems
Air-Water Systems
Air-Water Systems

HUMIDIFIER

 

ZONE REHEAT COIL (TWO-PIPE SYSTEM ONLY)

 

Air-Water Systems

Fig. 2 Primary Air System

Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning


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