The Hub

      The Hub Air-Air Heat Pump (ASHP)
      Downstairs Room Temperature
      Degrees Celsius
      ASHP Elect. input
      Estimate of carnot COP using estimated refrigerant temperatures only, and the Carnot equation. Defrosts (when they happen) will drop the estimate considerably
      Sponsored by openenergymonitor.org
      Carnot COP x45% = 5.0
      Evaporating Refrigerant 9.8 C
      Refrigerant Condensing 21.2 C
      Only meaningful when green (running)
      Electrical power of heat pump. Blue is all other electric use.
      Total elec. power (ASHP + Other)
      Outside 8.9 C
      Other electric use
      Room Temp. 17.5 C (mid)
      Kitchen power
      Room Temp. 17.1 C (by blower)
      Refrigerant1 probe probably superheated. Refrigerant2 probe probably condensing temperature
      see https://heatpumps.co.uk/the-hub/
      ignore the first day or two of this graph
      Energy, kWh per day
      Room
      Watts
      Watts
      Watts
      Yellow = heat pump input (watts). . Blue = other electrical use (watts)
      Heat Pump input and temperatures
      The overnight blue shows fridges and freezers. The spikes are the freezer defosting
      Kitchen kWh per day
      Hover mouse over bars to read values. The Total is all electricity, including heat pump and kitchen