period one
Types of Water Chillers
notes
Indoor Air-Cooled Condenser
indoor air-cooled condenser
refrigerant piping
condenserless | |
chiller | Figure 17 |
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The final configuration includes a packaged compressor-and-evaporator unit that is located in an indoor equipment room and connected to an indoor, air-cooled condenser. The air used for condensing is ducted from outdoors, through the condenser coil, and rejected either outdoors or inside the building as a means for heat recovery. Indoor condensers typically use a centrifugal fan to overcome the duct static-pressure losses, rather than the propeller fans used in conventional outdoor air-cooled condensers. Again, the components are connected with field-installed refrigerant piping.
This configuration is typically used where an outdoor condenser is architecturally undesirable, where the system is located on a middle floor of a multistory building, or where vandalism to exterior equipment is a problem.
A disadvantage of this configuration is that it typically increases condenser fan energy within compared to a conventional outdoor air-cooled condenser.
Similarly, a packaged cooling tower in a water-cooled system can also be located indoors. This configuration also requires outdoor air to be ducted to and from the cooling tower, and again, typically requires the use of a centrifugal fan. Centrifugal fans use about twice as much energy as a propeller fan, but can overcome the static-pressure losses due to the ductwork. Alternatively, the tower sump can be located indoors, making freeze protection easier.
