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5 HYDRONIC FREE COOLING SYSTEM
5.1.1 Introduction and system description
Free cooling units have additional coils used to pre-cool the glycol mixture using ambient air when the latter has a
temperature lower than that of the return mixture. If the external temperature is low enough to dissipate the entire thermal
load, compressors automatically turn off and the mixture temperature is controlled by fan speed regulation. If the mixture
temperature is too high, compressors will run as long as necessary.
In the free cooling hydaulic circuit, two motorized two-ways valves are installed. They work in opposition: when one is
open, the other is closed.
Once the free cooling function is enabled, the unit controller automatically manages the operation of the two valves. The
system controls, also, fans operation in order to maximize the free cooling effect.
System changeover is controlled by embedded unit controller, depending on operating conditions and unit setpoint.
Between mechanical and freecooling operation the water side pressure drops are different, consequently the chiller water
flow could be different. Evaluate that the minimum and maximum water flow, between the two operations, are inside the
water flow limits (see product manual).
The following figure reports a typical hydronic free cooling P&ID with the two motorized two-ways.
Fig. 27– Hydronic Free cooling P&ID
Bekijk gratis de handleiding van Daikin EWFD575TZPSD2, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Daikin |
| Model | EWFD575TZPSD2 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 11779 MB |
