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2
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
46 °C
50 °C
53 °C
* Mixing temperature is the temperature that is reached when the water in the tank is evenly mixed. Compressor OFF
without water flow.
PAW-VP•LDHW - Technical Manual – 2020-07
Low part tank
Middle part tank
48 °C
50 °C
52 °C
54 °C
55 °C
57 °C
67 °C
Set point 53 °C
55 °C
DHW Temperature layering
Upper part tank
Mixing temperature *
57 °C
52 °C
60 °C
56 °C
67 °C
61 °C
°C
X
Set temperature X
Compressor OFF = X + 3.5 K
Compressor ON = Y (or less)
2
Off 56.5 °C
ON 53.0 °C
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