How does a chiller plant work?

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A chiller plant normally consists of evaporator pumps, chillers, condenser pumps, and cooling towers.



The evaporator pumps pump chilled water out to the building through a water pipe loop to air handler units that use valves to vary the amount of chilled water to that unit's water coil to control the temperature of the air coming out of the unit. Thus added heat back into the water that goes back to the plant.


The return water from the building goes to the evaporator side of the chillers & they cool it back down, transferring the heat to the condenser side of the chillers, which is a separate water loop.


The condenser pumps pump the condenser water out to the cooling towers, which are outside. The water is pumped to the top of the tower & then rains down inside it. There are big fans on the top of the tower that pulls air through the tower, thus across the raining water & blows it outside. This water pools up at the bottom of the tower & is sucked back into the building to run through the condenser side of the chillers again, thru removing the heat from the building.
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