Method for operating a water circulation system

1. A method for operating a water circulation system, comprising the steps of:

providing the water circulation system, comprising:

at least one feed line ( 1 ),

at least one return line ( 2 ),

at least one strand ( 3 ), which connects the feed line ( 1 ) to the return line ( 2 ),

at least one temperature control unit ( 4 ), which connects the feed line ( 1 ) to the return line ( 2 ),

whereby water can circulate in a flow direction from said at least one feed line ( 1 ), through said at least one strand ( 3 ) and said at least one return line ( 2 ) back to said feed line ( 1 ),

at least one consumer ( 5 ), which is arranged along the at least one strand ( 3 ) and with which water can be taken from the circulation system,

at least one valve ( 6 ) with which the flow rate of the water in the circulation system can be changed,

at least one temperature sensor ( 60 , 61 , 62 ) with which the water temperature in a line section can be detected,

at least one system control with which the data of the at least one temperature sensor ( 60 , 61 , 62 ) can be processed and with which the at least one valve ( 6 ) can be actuated;

defining a first temperature (T 1 );

defining a second temperature (T 2 );

defining a lowering time (A);

detecting the water temperature with the at least one temperature sensor ( 60 , 61 , 62 );

setting the first temperature (T 1 ) in the line section by setting a first flow rate (D 1 ) with the at least one valve ( 6 );

setting the second temperature (T 2 ) in the line section by setting a second flow rate (D 2 ) with the at least one valve ( 6 ) during the lowering time (A);

defining a time window (Z F );

defining a minimum temperature difference;

calculating the absolute value of the difference between the detected water temperature and the first temperature (T 1 );

setting the second temperature (T 2 ) if the absolute value of the difference is less than or equal to the minimum temperature difference;

detecting the time during which the second temperature (T 2 ) is set;

setting the first temperature (T 1 ) if the absolute value of the difference is greater than the minimum temperature difference or if the total time during which the second temperature (T 2 ) is set is greater than the lowering time (A).

2. The method according to claim 1 , comprising the steps of:

defining a threshold value (V 0 );

calculating the absolute value of the difference between the detected water temperature and the first temperature (T 1 );

integrating the difference during the time window (Z F );

setting the second temperature (T 2 ) if the integral is less than or equal to the threshold (V 0 );

detecting the time during which the second temperature (T 2 ) is set;

setting the first temperature (T 1 ) if the integral is greater than the threshold (V 0 ) or if the total time during which the second temperature (T 2 ) is set is greater than the lowering time (A).

3. The method according to claim 1 , comprising the step of:

defining a time period (Z R ), wherein the second temperature (T 2 ) is only set if the current time is within the time period (Z R ).

4. The method according to claim 3 , wherein the time window (Z F ) is larger in the boundary areas of the time period (Z R ) than in its central area.

5. The method according to claim 3 , wherein several time periods (Z R ) are provided distributed over one day, wherein the second temperature (T 2 ) is the same, partially different or different in all time periods (Z R ).

6. The method according to claim 1 , comprising the steps of:

recording a temperature curve of the detected water temperatures;

assigning a specific consumption (V 1,2,3 ) to the recorded temperature curve during a time interval (I 1,2,3 ).

7. The method according to claim 1 , comprising the steps of:

defining at least one trigger temperature threshold;

detecting a time interval (I 1,2,3 ) during which the at least one trigger temperature threshold is exceeded;

assigning a specific consumption (V 1,2,3 ) to the recorded time interval (I 1,2,3 ).

8. The method according to claim 2 , comprising the steps of:

recording a temperature curve of the detected water temperatures;

adjusting the time window (Z F ), the threshold value (V 0 ), the second temperature (T 2 ), the lowering time (A) or the time period (Z R ) based on the recorded temperature curves.

9. The method according to claim 1 , wherein the at least one valve ( 6 ) is connected downstream of the at least one consumer ( 5 ) in the flow direction.

10. The method according to claim 1 , wherein the water circulation system comprises a hot-water circulation having the at least one temperature control unit ( 4 ) which can supply heat to the circulation system and/or wherein the water circulation system comprises a cold-water circulation having the at least one temperature control unit ( 4 ) which can extract heat from the circulation system.