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8 WSHP-PRC022-EN

Application Considerations

Source vs. Load

The water-to-water heat pump contains two water-to-refrigerant heat exchanger s. The two heat

exchangers enable the system to be divided into a source and load separation.

The source-side heat exchanger performs as a standard water-to-air heat pump system.The source

is typically supplied through a cooling tower, boiler, closed loop, or open well system. During the

refrigeration cycle, heat is transferred from the source-side heat exchanger to the load-side heat

exchanger.

The load-side heat exchanger takes the place of a DX (direct expansion) air coil. It provides treated

fluid (hot or cold) to a mechanical device.These mechanical devices include designs such as radiant

slab heating, hydronic coils, or fresh air ventilation units.

See Figure 3, p. 8 for a basic schematic of source-side verses load-side of a water-to-water system.

Figure 2. Hybrid loop

Figure 3. Source vs. load

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