Dantherm HPP Serie Manual De Instalación página 4

EN
The Heat Pump Cycle
Coefficient of Performance
4
Function
The Dantherm HPP Swimming pool heat pump provides thermodynamic heating by means of
a vapour compression cycle, (similar to that employed in a conventional refrigerator), in addition
to acting as an active solar collector.
High pressure
side
Water out
Water in
1. The evaporator collects sensible and latent heat from outside ambient air, pre-heated by the
sun. This process is enhanced by an internal fan that foreces large quantities of air across the
evaporator.
The evaporator consistes of a series of finned tubes, which have cold liquid refrigerant passing
through them. They are capable of extracting energy from the ambient air that passes across
them. In doing so, the ambient air gives up its heat to the refrigerant which then vaporizes. This
preheated vapour now travels to...
2. The compressor where it is compressed and upgraded to a useable form of heat. The hot
vapour now enters...-
3. The Condensor where it is surrounded by the pool water. The heat is given up to the cooler
pool water and the now cold refrigerant returns to its former liquid state but still under high
pressure from the compressor.
This pressure is released by passing the liquid through... -
4. The Expansion valve and from there, now at low pressure and temperature, it is returned to
the evaporator and the cycle starts again.
The efficiency of a Heat Pump is called its 'Coefficient of Performance' - (COP) which is simply a
ratio of heat output to energy input, both being expressed in kW. Thus a Heat Pump absorbing
1 kW of electricity, collecting 4 kW of energy from the air, and delivering 5 kW of heat to the pool
water is said to have a COP of 5.
This ratio will vary according to the temperature of the water and the ambient air.
Compressor
Hot gas Cool Gas
Heat
Evaporator
Exchanger
Condensed Cold liquid
re gerant re gerant
Expansion
valve
Low pressure
side
Outside air