Heat Controller Water Source Heat Pump - Manual (Page 9)

WattMaster WHP
Section 1
Design Guide
1-3
Figure 1-1: Typical Water Source Heat Pump
During the cooling mode, the tube-in-tube heat exchanger functions as a condenser and
the coil as an evaporator. In heating mode, the tube-in-tube heat exchanger functions as
an evaporator and the coil as a condenser. A reversing valve is installed in the refrigerant
circuit permitting changeover from heating to cooling, and vice versa. The condenser and
evaporator tubes are designed to accept hot and cold refrigerant liquid or gas.
Water Source Heat Pump Systems
The water source heat pump system is, by definition, a heat recovery system. It is best
applied to buildings that have simultaneous cooling and heating loads. This is the case
during winter months when the interior zones of a typical building require cooling while
the exterior zones require heating. When a water source heat pump system is used, the
heat rejected by the cooling units is used to warm the zones calling for heat. A water
heater is generally used for adding heat to the condensing water during peak heating
periods, if necessary. The system also utilizes a water cooling tower to reject the heat
energy from the condenser water loop during periods of high cooling demand.
Water source heat pump units can be suspended in the ceiling plenum, floor mounted
behind walls or placed directly in the occupied space as a console unit. There are also
rooftop and unit ventilator type water source heat pumps.
Figure 1-2: Typical Water Source Heat Pump System
Water source heat pump systems generally cost less to install than central built-up
systems. They offer individual zone control with the added flexibility of being able to