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DHW PAW-VP - Installation manual – 2020-05
DHW Temperature layering
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DHW Temperature layering
The water temperature distribution in the tank is not homogeneous! Due to the thermodynamic
properties of the refrigerant, the water is at different temperatures across the tank volume.
(Top: discharge gas cooling area
Middle: condensing area
Bottom subcooling area)
This is expected to result in a layering of temperatures.
See example 1000ltr DHW tank
Set point position of TA temperature sensor (ON /OFF)
Set point
Low part tank
Middle part tank
Upper part tank
Mixing temperature
46 °C
48 °C
50 °C
57 °C
52 °C
50 °C
52 °C
54 °C
60 °C
56 °C
53 °C
55 °C
57 °C
67 °C
61 °C
67 °C
Set point 53 °C
55 °C
* Mixing temperature is the temperature that is reached when the water in the tank is evenly mixed. Compressor OFF
without water flow.
°C
X
Off 56.5 °C
ON 53.0 °C
Set temperature X
Compressor OFF = X + 3.5 K
Compressor ON = Y (or less)
