Refrigeration circuit of the heat pump / operating principle

  • The evaporator is designed to be very large
  • Increased surface area (fins) on the air side
  • Fan for controlled airflow
  • HP unit output control via compressor speed control
  • Minimum flow rate on the heating side (~1,600 l/h)

Verdampfer

Wärmetauscher Außenluft

Umweltenergie wird dem Verdampfer zugeführt. Dabei verdampft Kältemittel. Die Außenluft wird dabei heruntergekühlt.

Verdichter

Kompressor

Druck- und Temperaturerhöhung durch Kompressor

Verflüssiger

Wärmetauscher Heizwasser 

Heißes Kältemittel wird dabei verflüssigt und unterkühlt. Energie geht an Heizwasser über.

Expansionsventil

Düse 

Starker Druckabfall an Düse; dadurch wird Kältemittel sehr kalt. Es kann wieder viel Umweltenergie aufnehmen

(Kopie 1)

Efficiency

In short:

Source temperature as high as possible, discharge temperature as low as possible.

Background: Refrigerant (R290) requires different pressures at different target temperatures.

Vapor pressure table

R290 (propane)

TemperaturePressure
-30°C1.678 bar
-20°C2.445 bar
-10°C3.453 bar
0°C4.745 bar
+10°C6.366 bar
+20°C8.365 bar
+30°C10.79 bar
+40°C13.69 bar
+50°C17.13 bar
+60°C21.17 bar
+70°C25.87 bar
+80°C31.32 bar

Compressor capacity

The compressor must generate the pressure difference required for the refrigerant to condense.

SourceDischargePressuresCompressor capacity
-10°C35°C3.453 / 12.188.727 bar
-10°C55°C3.453 / 19.0715.617 bar
+10°C35°C6.366 / 12.185.814 bar
+10°C55°C6.366 / 19.0712.704

(copy 10)

Monobloc heat pump principle

(Kopie 3)

(Kopie 5)

Sound propagation

The noisecalculator allows you to estimate noise levels in neighbors' rooms that require protection and determine the necessary distance for the heat pump.

In addition to the heat pump’s specifications, the installation location, distance to neighbors, and topography also influence noise levels.

The TA Lärm distinguishes between different sensitivity levels (industrial area, mixed-use area, residential area, resort area).

(Kopie 7)

(Kopie 11)

(copy 9)

Installation conditions (example Lambda)

  • Installation Instructions
  • Protection Zones 
  • Minimum distances
  • Sound insulation

Installation and Operating Instructions Lambda