references
Heat pumps and gas boilers
Operation based on energy costs
This involves determining the outdoor temperature at which a COP value for the heat pump corresponding to the equilibrium point between electricity and gas will be reached, in terms of energy consumption level costs. This coefficient of performance depends on the required hot water temperature setpoint for a given outdoor temperature and corresponds to the ratio between the cost of a kWh of electricity and of a kWh of gas. Below this COP equilibrium value, the gas boiler will be switched on and the heat pump stopped. Above this value, the operating priority will be given to the heat pump, as the cost of its electricity consumption will be less than that of gas.
COP equilibrium =
Price of kWh of electricity x Boiler output Price of kWh of gas
Determining the outdoor temperature for activating the boiler (energy cost)
In the example below, for a hot water production temperature setpoint of +45°C, and a price for electricity which is 2.5 times the price of natural gas, the gas boiler will be activated at an outdoor temperature of approximately +3°C.
Electric heat pump switch-off temperature
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C -12 °C 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
+30°C +50°C +45°C +40°C +35°C
Electric heat pump switch-off temperature
ILDC 180V: HEAT PUMP/BOILER switching temperature based on the (Electricity price/Gas price) ratio
ILDC 200V: HEAT PUMP/BOILER switching temperature based on the (Electricity price/Gas price) ratio
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C 12 °C 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
+30°C +50°C +45°C +40°C +35°C
(Electricity price/Gas price)
(Electricity price/Gas price)
ILDC 240V: HEAT PUMP/BOILER switching temperature based on the (Electricity price/Gas price) ratio Electric heat pump switch-off temperature
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C 12 °C 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
ILDC 300V: HEAT PUMP/BOILER switching temperature based on the (Electricity price/Gas price) ratio Electric heat pump switch-off temperature
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C 12 °C 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0
+50°C
+50°C
+45°C +40°C +35°C +30°C
+45°C +40°C
+35°C +30°C
(Electricity price/Gas price)
(Electricity price/Gas price)
HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A
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