| 摘要 |
The present invention relates to a heating comprising a flow circuit for flowing a working fluid at a set flow temperature to a heat emitting section (30) for space heating, an electricity driven heat pump (20) having a first heat exchanger (22) connected to the flow circuit for transfer of heat to the working fluid, a fuel fired boiler (10) having a second heat exchanger connected to the flow circuit for transfer of heat to the working fluid downstream of the first heat exchanger (22) and a control configured to determine the coefficient of performance (COP Set Flow Temperture ) of the heat pump for the set flow temperature and a break even coefficient of performance (BECOP) being the electricity price divided by the fuel price multiplied by the thermal efficiency of the boiler and to compare the COP Set Flow Temperture with the BECOP, wherein if the COP Set Flow Temperture is smaller than the BECOP the control is configured to in a first hybrid mode determine an intermediate flow temperature at which the COP Intermediate Flow Temperature is higher than the BECOP and to operate the heat pump (20) so that the working fluid is heated to the intermediate flow temperature by the first heat exchanger (22) and to operate the boiler (10) so that the working fluid is heated from the intermediate flow temperature to the set flow temperature by the second heat exchanger. The present invention also relates to a corresponding control method. |
