Method for operating a heat generator

Abstract

A method for operating a heat generator ( 1, 12 ) comprises providing a set heat quantity Qsoll in a hydraulic circuit; acquiring a first actual temperature T 1 of a heating circuit medium in the circuit; acquiring a second actual temperature T 2 at a second time t 2 , determining a temperature rise ΔT as a difference between the second actual temperature T 2 and the first actual temperature T 1 ; acquiring a heat quantity Qzu introduced into the hydraulic circuit; determining a set temperature Tsoll of the heating circuit medium as a function of the set heat quantity Qsoll, the temperature rise ΔT and the introduced heat quantity Qzu; and operating the heat generator ( 1, 12 ) as a function of the determined set temperature Tsoll.

1 . A method for operating a heating system for heating and/or cooling a building with a heat pump which heats a fluid heating circuit medium which circulates in a hydraulic circuit, wherein the circuit has a load, a buffer and the heat pump which are connected to one another via lines, wherein the method comprises the following steps:
 providing a set heat quantity Qsoll in the hydraulic circuit;   acquiring a first actual temperature T 1  of the heating circuit medium at a first time t 1 ;   acquiring a second actual temperature T 2  of the heating circuit medium at a second time t 2  which lies after the first time t 1  by a predefined time period Δt;   determining a temperature rise ΔT as a difference between the second actual temperature T 2  and the first actual temperature T 1 ;   acquiring a heat quantity Qzu introduced into the hydraulic circuit by the heat pump during the time period Δt;   determining a set temperature Tsoll of the heating circuit medium as a function of the set heat quantity Qsoll, the temperature rise ΔT and the introduced heat quantity Qzu; and   operating the heat pump as a function of the determined set temperature Tsoll.   
     
     
         2 . The method according to  claim 1 , wherein the actual temperature of the heating circuit medium is measured between the buffer and the load. 
     
     
         3 . The method according to  claim 1 , wherein:
 the load is a refrigerant circuit of a heat pump; and   the heating circuit medium flows through a heat exchanger of the heat pump in order to transfer heat to the refrigerant.   
     
     
         4 . The method according to  claim 3 , further comprising:
 carrying out a charging operation of the buffer until a current actual temperature of the heating circuit medium is equal to or greater than the set temperature Tsoll; and   carrying out a defrosting operation for defrosting an evaporator of the heat pump.   
     
     
         5 . The method according to  claim 3 , wherein the predefined set heat quantity Qsoll is determined as a function of an external temperature and a device type of the heat pump. 
     
     
         6 . The method according to  claim 1 , wherein the heat pump is operated with maximum heating power until the actual temperature of the heating circuit medium is equal to or greater than the set temperature Tsoll. 
     
     
         7 . The method according to  claim 6 , further comprising:
 determining a heating power required to reach the set temperature Tsoll; and   if the required heating power is greater than the maximum heating power of the heat pump, operating an additional heat generator for heating the heating circuit medium.   
     
     
         8 . The method according to  claim 1 , further comprising:
 providing a minimum temperature Tmin for the heating circuit medium; and   determining the set temperature Tsoll of the heating circuit medium as a function of the minimum temperature Tmin.   
     
     
         9 . A heating system for heating and/or cooling a building, comprising:
 a hydraulic circuit with a load and a buffer which are connected to one another via lines, wherein a fluid heating circuit medium circulates in the hydraulic circuit;   a heat pump which is arranged in the circuit and is configured to heat the heating circuit medium;   a temperature sensor which is arranged in the hydraulic circuit and is configured to acquire an actual temperature of the heating circuit medium; and   a control device for controlling the heat pump, wherein the control device is configured to:
 provide a set heat quantity Qsoll in the hydraulic circuit; 
 acquire a first actual temperature T 1  of the heating circuit medium at a first time t 1 ; 
 acquire a second actual temperature T 2  of the heating circuit medium at a second time t 2  which lies after the first time t 1  by a predefined time period Δt; 
 determine a temperature rise ΔT as a difference between the second actual temperature T 2  and the first actual temperature T 1 ; 
 acquire a heat quantity Qzu introduced into the hydraulic circuit by the heat pump during the time period Δt; 
 determine a set temperature Tsoll of the heating circuit medium as a function of the set heat quantity Qsoll, the temperature rise ΔT and the introduced heat quantity Qzu; and 
 operate the heat pump as a function of the determined set temperature Tsoll. 
   
     
     
         10 . The heating system according to  claim 9 , wherein the temperature sensor is arranged between the buffer and the load. 
     
     
         11 . The heating system according to  claim 9 , wherein:
 the load is a refrigerant circuit of a heat pump in the heating system; and   the heating circuit medium flows through a heat exchanger of the heat pump in order to transfer heat to the refrigerant.   
     
     
         12 . The heating system according to  claim 11 , wherein the control device is further configured to:
 carry out a charging operation of the buffer until a current actual temperature of the heating circuit medium is equal to or greater than the set temperature Tsoll; and   carry out a defrosting operation for defrosting an evaporator of the heat pump.   
     
     
         13 . The heating system according to  claim 11 , further comprising an external temperature sensor for measuring an external temperature, wherein the control device is configured to determine the predefined set heat quantity Qsoll as a function of the external temperature and a device type of the heat pump. 
     
     
         14 . The heating system according to  claim 9 , wherein the control device is configured to operate the heat pump with maximum heating power until the actual temperature of the heating circuit medium is equal to or greater than the set temperature Tsoll. 
     
     
         15 . The heating system according to  claim 14 , further comprising:
 an additional heat generator for heating the heating circuit medium, wherein the control device is further configured to:   determine a heating power required to reach the set temperature Tsoll; and   if the required heating power is greater than the maximum heating power of the heat pump, operate the additional heat generator for heating the heating circuit medium.   
     
     
         16 . The heating system according to  claim 9 , wherein the control device is further configured to:
 provide a minimum temperature Tmin for the heating circuit medium; and   determine the set temperature Tsoll of the heating circuit medium as a function of the minimum temperature Tmin.