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
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
M
merlin66729 Jul 2013 09:16if you don’t trust your heating technician:
User manual
If that doesn’t help, call the manufacturer.
If someone here has experience with your heat pump, they might be able to help, as the controls are very specific to the manufacturer.
User manual
If that doesn’t help, call the manufacturer.
If someone here has experience with your heat pump, they might be able to help, as the controls are very specific to the manufacturer.
The brine circuit is definitely running; I just turned on the cooling. The source temperature was around 20°C (68°F), shortly before that there was domestic hot water operation, and it dropped to 11°C (52°F) within a minute. Supply and return temperatures stabilized at 24.2°C (75.6°F). Outside temperature is 21°C (70°F), inside 23°C (73°F).
M
merlin66729 Jul 2013 09:55That means the ground loop is running. Do you happen to have supply and return temperature sensors there as well? Is the heating circuit still operating? Have you checked during winter operation if there is a temperature difference between the heating supply and return lines? What is the current room temperature?
Where were the supply and return temperatures before switching on?
One thing not to overlook: to cool 1 liter of water per second by 1°C (1.8°F) requires approximately 4.2 kW of cooling power (P = V × Δt × c).
I have no idea what heating output you have, but with an 8 kW heating output and a 5°C (9°F) temperature difference between supply and return, about 1400 liters per hour (l/h) flow through. So, a 0.5°C (0.9°F) difference between supply and return would correspond to 0.8 kW, and 1°C (1.8°F) would correspond to 1.6 kW of cooling power. To me, that means you should always see at least a small difference.
Where were the supply and return temperatures before switching on?
One thing not to overlook: to cool 1 liter of water per second by 1°C (1.8°F) requires approximately 4.2 kW of cooling power (P = V × Δt × c).
I have no idea what heating output you have, but with an 8 kW heating output and a 5°C (9°F) temperature difference between supply and return, about 1400 liters per hour (l/h) flow through. So, a 0.5°C (0.9°F) difference between supply and return would correspond to 0.8 kW, and 1°C (1.8°F) would correspond to 1.6 kW of cooling power. To me, that means you should always see at least a small difference.
The heating system runs perfectly, usually around 28°C (82°F) supply and 25°C (77°F) return. I’m not sure about turning the sources on and off in winter; the source temperature shows a difference of at least 0.3°C (0.5°F) between inlet and outlet. The source temperature hardly changes during cooling operation.
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