Daikin WMC Specifications download pdf (Page 41)

Catalog 602-2 41

Application

Considerations

Location

WMC chillers are intended only for installation in

an indoor or weather protected area consistent with

the NEMA 1 rating on the chiller, controls, and

electrical panels. Equipment room temperature for

operating and standby conditions is 40°F to 122°F

(4.4°C to 50°C).

Optimum Water

Temperatures and Flow

A key to improving energy efficiency for any

chiller is minimizing the compressor pressure lift.

Reducing the lift reduces the compressor work and

its energy consumption per unit of output. The

chiller typically has the largest motor of any

component in a chilled water system.

Higher leaving chilled water

temperatures

Warmer leaving chilled water temperatures will

raise the compressor’s suction pressure and

decrease the lift, improving efficiency. Using 45F

(7.0C) leaving water instead of 42F (5.5C) will

make a significant improvement.

Evaporator temperature drop

The industry standard has been a 10-degree F (5.5

degree C) temperature drop in the evaporator.

Increasing the drop to 12 or 14 degrees F (6.6 or

7.7 degrees C) will improve the evaporator heat

transfer, raise the suction pressure, and improve

chiller efficiency. Chilled water pump energy will

also be reduced.

Condenser entering water temperature

As a general rule, a one-degree drop in condenser

entering water temperature will reduce chiller

energy consumption by two percent. Cooler water

lowers the condensing pressure and reduces

compressor work. One or two degrees can make a

noticeable difference. The incremental cost of a

larger tower can be small and provide a good

return on investment.

Condenser water temperature rise

The industry standard of 3 gpm/ton or about a 9.5-

degree delta-T seems to work well for most

applications. Reducing condenser water flow to

lower pumping energy will increase the water

temperature rise, resulting in an increase in the

compressor’s condensing pressure and energy

consumption. This is usually not a productive

strategy.

Chilled Water Temperature

The maximum temperature of water entering the

chiller on standby must not exceed 110 F (43 C).

Maximum temperature entering on start-up must

not exceed 90F (32.2C). Minimum chilled water

leaving temperature without antifreeze is

approximately 36F (2.2C).

Piping

Piping must be adequately supported to remove

weight and strain on the chiller’s fittings and

connections. Be sure piping is adequately

insulated. Install a cleanable 20-mesh water

strainer at the inlet of the evaporator and

condenser. Install enough shutoff valves to permit

draining water from the evaporator or condenser

without draining the complete system.

Do use PVC or CPVC piping for any water lines.

Should a refrigerant-to-water leak occur, POE

lubricant in the refrigerant can have an adverse

effect on the pipe.

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Daikin WMC Specifications Page 41

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