Sunrain BYC-007TF1, Installation & Operation Manual

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3. Heat pump unit working principle
3.1 Heat pump operation
Heat pumps use heat from the sun by collecting and absorbing energy from the outside air.
This energy is then compressed and transferred to the pool water. Your existing water pump circulates the
water through the heat pump, which is normally installed next to the pool filtration system, and the water warms
up. The heat pump timer can be set so that the pump operates at the times you want: for example, during
daylight hours from 9am to 5pm.

The unit contains a fan that draws in outside air and directs it over the surface of the EVAPORATOR
(energy collector). The liquid refrigerant inside the EVAPORATOR coil absorbs the heat from the outside air
and becomes a gas.

The warm gas inside the coil passes through the COMPRESSOR, which concentrates and increases the
heat to form a very hot gas, which then passes through the CONDENSER (water heat exchanger). It is here
that the heat exchange occurs as the heat from the hot gas is transferred to the cool swimming pool water
circulating through the heat exchanger.

The pool water becomes warmer and the hot gas returns to its liquid form as it flows through the
CONDENSER coil. The gas then passes through the Electronic Expansion Valve and the whole process
begins again.

Developments in heat pump technology mean that today heat pumps can efficiently collect heat from the
outside air even when the temperature is as low as 7-10°C. This means that for tropical and subtropical
climates the pool can be maintained between 26°C and 32°C.
3.2 Air source heat pump working principle
4 way valve
Water inlet
Water Outlet
Condenser
Gas-liquid
separator
Compressor
Filter
Expansion valve
Filter
Ev
ap
or
ato
r
Fa
n
un
it
Figure 1
Q
c
(Heat energy) =Q
a
(Compressor consumption) +Q
b
(Heat energy absorbed from ambient
environment)