references
Heat pumps and gas boilers
AQUACIAT2HYBRID
MANAGING
THE GAS BOILER
Operation based on primary energy
The principle relies on determining the outdoor temperature at which the heat pump's minimum COP value will be obtained (2.58 for France), based on the required hot water outlet temperature. Below this temperature, the boiler will be switched on and the heat pump stopped. Applied to electricity, this conversion coefficient means that in France, 2.58 kWh of primary energy are required to supply 1 kWh of electrical energy, with natural gas having a value of 1.00. Therefore:1 kWh of electricity = 2.58 kWh of primary energy (gas) In HEATING mode, two usage profiles are possible to govern the operating priority between the heat pump and the gas boiler: - Either according to a primary energy performance criterion based on a minimum COP for the heat pump. - Or according to an economic criterion based on the ratio between the cost of electricity and the cost of gas.
Determining the outdoor temperature for activating the boiler (primary energy)
In the example below, for a hot water production temperature setpoint of +45°C, the gas boiler will be activated in France at an outdoor temperature of approximately 3°C with a coefficient of 2.58.
Electric heat pump switch-off temperature
Electric heat pump switch-off temperature
ILDC 180V: HEAT PUMP/BOILER switching temperature based on the primary energy ratio (electricity/gas)
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C -12 °C 2,0 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8 2,9 3,0
+35°C +30°C +50°C +45°C +40°C
ILDC 200V: HEAT PUMP/BOILER switching temperature based on the primary energy ratio (electricity/gas)
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C -12 °C 2,0 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8 2,9 3,0
+35°C +30°C +50°C +45°C +40°C
(PE conversion coef.)
(PE conversion coef.)
Electric heat pump switch-off temperature
Electric heat pump switch-off temperature
ILDC 240V: HEAT PUMP/BOILER switching temperature based on the primary energy ratio (electricity/gas)
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C -12 °C 2,0 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8 2,9 3,0
+35°C +30°C +50°C +45°C +40°C
ILDC 300V: HEAT PUMP/BOILER switching temperature based on the primary energy ratio (electricity/gas)
15 °C 12 °C 9 °C 6 °C 3 °C 0 °C -3 °C -6 °C -9 °C -12 °C 2,0 2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8 2,9 3,0
+35°C +30°C +50°C +45°C +40°C
(PE conversion coef.)
(PE conversion coef.)
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HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A