ᐅ Measurements Natural Cooling Heat Pump

Hello,
I am interested in the typical measurement values for a heat pump with cooling function, as my values seem to be lower than expected. Shouldn't there be a difference between the supply and return temperatures? According to the heating engineer, the values are normal. The pump is a Waterkotte A1+ with deep drilling.

Indoor temperature: 21.7°C (thermometer)
Outdoor temperature: 29.8°C (pump)
Supply temperature: 21.9°C
Return temperature: 21.9°C

Doesn’t anyone have a Waterkotte and can share their readings? I have the feeling something might be off, but it’s really hard to find comparable data online. Here are the current values:

Current values:
Return target 18°C (64°F)
Outside 21.9°C (71°F)
Inside 24.3°C (75.7°F)
Supply/Return 24.5°C (76.1°F)
Source in 11.1°C (52°F)
Source out 11.3°C (52.3°F)
Evaporator 20.5°C (69°F)
Condenser 15.6°C (60°F)
Suction line 29°C (84°F)

Hmm, whether it’s the brine circuit or the heating circuit, there should definitely be a temperature difference—provided it is running. What (desired) indoor temperature do you have set? To me, it looks like neither the brine circuit nor the water circuit is moving. That would also explain why the supply and return temperatures are very close to the indoor temperature. Without a temperature difference (in brine or water), there is no energy transfer and therefore no cooling capacity at all.

There is flow in the heating circuit; all valves on the heating manifold are open and flow is noticeable. The room temperature cannot be set directly, but the return temperature target is set to 18°C (64°F). Sometimes, there is a difference of 0.1°C (0.2°F) between the supply and return temperatures. According to the heating technician, this is normal, but I’m not entirely convinced.

Then I would have said the brine circuit is stopped. Because, as mentioned, without a temperature difference there is no energy transfer.

How can I tell if the brine circuit is stopped? I already discussed this issue with the heating engineer last year, provided the measurement values, and was told that everything was fine.