Heat pump system and method for operating a heat pump system

Abstract

In a method for operating a heat pump system, heat can be supplied to a heating circuit medium using a heat pump; a heating circuit medium flows through a heating circuit; in a first operating mode of the heat pump system, heat is supplied to at least one heat sink located in the heating circuit between a flow line of the heating circuit and a return line of the heating circuit; in a second operating mode of the heat pump system, heat is supplied to a buffer located in the heating circuit between the flow line and the return line and in parallel with the at least one heat sink. In a third operating mode of the heat pump system, an electrical heating device is used to supply heat to the heating circuit medium located in the buffer in order to start the heat pump.

1 . A heat pump system, comprising a heat pump ( 1 ) for heating a heating circuit medium, a heating circuit ( 2 ) through which the heating circuit medium flows, at least one heat sink ( 3 ) arranged on the heating circuit ( 2 ) between a flow line ( 2 . 1 ) of the heating circuit ( 2 ) and a return line ( 2 . 2 ) of the heating circuit ( 2 ), and a buffer ( 4 ) arranged on the heating circuit ( 2 ) between the flow line ( 2 . 1 ) and the return line ( 2 . 2 ) and parallel to the at least one heat sink ( 3 ), wherein an electrical heating device ( 5 ) is provided for heating the heating circuit medium located in the buffer ( 4 ), wherein a heat exchanger ( 6 ), through which heating circuit medium heated by the electrical heating device ( 5 ) and coming from the buffer ( 4 ) can flow, is provided between the heat pump ( 1 ) and the heating circuit ( 2 ),
 wherein   a valve device ( 8 ) is arranged on the flow line ( 2 . 1 ) for transmitting the heating circuit medium optionally to the at least one heat sink ( 3 ) and/or to the buffer ( 4 ), and wherein   a temperature sensor ( 9 ) is arranged on a return line-side inlet ( 6 . 1 ) of the heat exchanger ( 6 ).   
     
     
         2 . The heat pump system according to  claim 1 ,
 wherein   the electrical heating device ( 5 ) is arranged on the heating circuit ( 2 ), in particular on the flow line ( 2 . 1 ) thereof.   
     
     
         3 . A method for operating a heat pump system, in the case of which heat can be supplied to a heating circuit medium by means of a heat pump ( 1 ), in the case of which the heating circuit medium flows through a heating circuit ( 2 ), in the case of which heat is supplied to at least one heat sink ( 3 ), which is arranged on the heating circuit ( 2 ) between a flow line ( 2 . 1 ) of the heating circuit ( 2 ) and a return line ( 2 . 2 ) of the heating circuit ( 2 ) in a first operating mode of the heat pump system, in the case of which heat is supplied to a buffer ( 4 ), which is arranged on the heating circuit ( 2 ) between the flow line ( 2 . 1 ) and the return line ( 2 . 2 ) and parallel to the at least one heat sink ( 3 ) in a second operating mode of the heat pump system,
 wherein   in a third operating mode of the heat pump system, heat is supplied to the heating circuit medium located in the buffer ( 4 ) by means of an electrical heating device ( 5 ), in order to start the heat pump ( 1 ).   
     
     
         4 . The method according to  claim 3 ,
 wherein   heat is supplied to the heating circuit medium located in the buffer ( 4 ) via the heating circuit medium, which is heated by the electrical heating device ( 5 ), which is arranged on the heating circuit ( 2 ), in particular on the flow line ( 2 . 1 ) thereof.   
     
     
         5 . The method according to  claim 3 ,
 wherein   at least at the beginning of the third operating mode, heating circuit medium supplied only to the buffer ( 4 ) is heated by means of the electrical heating device ( 5 ).   
     
     
         6 . The method according to  claim 3 ,
 wherein   to start the heat pump ( 1 ), the heating circuit medium heated by the electrical heating device ( 5 ) is conveyed to a heat exchanger ( 6 ), which connects the heat pump ( 1 ) to the heating circuit ( 2 ).   
     
     
         7 . The method according to  claim 6 ,
 wherein   in the third operating mode, only heating circuit medium from the buffer ( 4 ) is supplied to the heat exchanger ( 6 ).   
     
     
         8 . The method according to  claim 6 ,
 wherein   in a fourth operating mode of the heat pump system following the third operating mode, heating circuit medium is supplied to the heat exchanger ( 6 ) optionally from the heat sink ( 3 ) and/or from the buffer ( 4 ), depending on the heat demand.   
     
     
         9 . The method according to  claim 6 ,
 wherein   the third operating mode is activated when a predefined lower limit temperature on the heat exchanger ( 6 ) is fallen below.   
     
     
         10 . The method according to  claim 6 ,
 wherein   the third operating mode is deactivated when a predefined upper limit temperature on the heat exchanger ( 6 ) is exceeded.   
     
     
         11 . The method according to  claim 8 ,
 wherein   in the fourth operating mode, the electrical heating device ( 5 ) is turned off.   
     
     
         12 . The method according to  claim 8 ,
 wherein   at the beginning of the fourth operating mode, more heating circuit medium is supplied to the buffer ( 4 ) than to the heat sink ( 3 ), and wherein towards the end of the fourth operating mode more heating circuit medium is removed from the heat sink ( 3 ) than from the buffer ( 4 ).   
     
     
         13 . The method according to  claim 8 ,
 wherein   the fourth operating mode is ended when the heating circuit medium is no longer removed from the buffer ( 4 ), but only from the heat sink ( 3 ) due to the temperature conditions on the heat exchanger ( 6 ).