Humidifier and method for conditioning air

1. A humidifier ( 10 , 32 ) for a test chamber, in particular a climate chamber, said humidifier comprising a container ( 11 ) having a container interior ( 12 ) for receiving a water bath ( 13 ), a heating device ( 15 ) of a temperature-control system ( 14 ) for controlling the temperature of the water bath, and a ventilation system ( 17 ) for generating air bubbles ( 18 ) in the water bath, a container opening ( 28 ) being formed in the container above the water bath in order to connect the container interior to a test space of a test chamber, wherein the humidifier comprises a cooling device ( 16 ) of the temperature-control system;

wherein a first ventilation device ( 23 ) of the ventilation system ( 17 ) is adjacent to the heating device ( 15 ) and a second ventilation device ( 24 ) is adjacent to the cooling device ( 16 ); and

wherein the heating device ( 15 ) and the cooling device ( 16 ) each have a heat exchanger ( 19 , 21 ) arranged in the water bath ( 13 ).

2. The humidifier according to claim 1 , characterized in that the first and second ventilation devices ( 23 , 24 ) each comprise a compressed-air line ( 26 ) having an air outlet, a porous membrane ( 25 ) forming the air outlet in each instance and being arranged below the heating device ( 15 ) and the cooling device ( 16 ), respectively.

3. The humidifier according to claim 2 , characterized in that the porous membrane ( 25 ) is disc-shaped.

4. The humidifier according to claim 1 , characterized in that the humidifier ( 32 ) comprises a flow system ( 33 ) comprising a duct ( 34 ) arranged in the container ( 11 ), an upper end ( 35 ) of the duct ( 34 ) and a lower end ( 36 ) of the duct ( 34 ) being open, the heat exchanger ( 19 , 21 ) being arranged in the duct.

5. The humidifier according to claim 4 , characterized in that the duct ( 34 ) is formed by a hollow profile ( 37 ), an upper edge of the upper end being arranged above a water level ( 27 ) of the water bath ( 13 ).

6. The humidifier according to claim 5 , characterized in that the heat exchanger ( 19 ) of the heat device ( 15 ) and the heat exchanger ( 21 ) of the cooling device ( 16 ) are each arranged within the hollow profile ( 37 ).

7. The humidifier according to claim 4 , characterized in that ventilation devices ( 23 , 24 ) of the ventilation system ( 17 ) are each arranged within or below the duct and the duct ( 34 ) is realized such that air bubbles ( 18 ) in the water bath ( 13 ) rise within the duct.

8. The humidifier according to claim 1 , characterized in that the humidifier ( 10 , 32 ) comprises a filling level sensor, a supply valve and a discharge valve.

9. The humidifier according to claim 1 , characterized in that the humidifier ( 10 , 32 ) comprises a control valve having a test-chamber control circuit and a humidifier control circuit, said test-chamber control circuit comprising a humidity sensor for measuring a relative air humidity in the test space and serving for controlling the humidity in the test space, said humidifier control circuit comprising a temperature sensor for measuring the temperature in the water bath ( 13 ) and/or a humidity sensor, preferably a dew point sensor, for measuring a relative air humidity in the container interior ( 12 ) and serving for controlling the humidity and/or temperature in the container interior, said control valve being realized as a cascading control having the test-chamber control circuit as a guiding controller and the humidifier control circuit as a follow-up controller.

10. A test chamber for conditioning air, comprising a temperature-insulated test space for receiving test materials which can be sealed against an environment as well as a humidifier ( 10 , 32 ) according to claim 1 .

11. A method for conditioning air of a test space of a test chamber, in particular a climate chamber or the like, using a humidifier ( 10 , 32 ), a water bath ( 13 ) being received in a container interior ( 12 ) of a container ( 11 ) of the humidifier, the temperature of the water bath being controlled by means of a heating device ( 15 ) of a temperature-control system ( 14 ) of the humidifier, air bubbles ( 18 ) being generated in the water bath by means of a ventilation system ( 17 ) of the humidifier, a container opening ( 38 ), which is formed in the container, connecting the container interior to a test space of a test chamber above the water bath, characterized in that the temperature of the water bath is controlled by means of a cooling device ( 16 ) of the temperature-control system of the humidifier;

wherein a first ventilation device ( 23 ) of the ventilation system ( 17 ) is adjacent to the heating device ( 15 ) and a second ventilation device ( 24 ) is adjacent to the cooling device ( 16 ); and

wherein the heating device ( 15 ) and the cooling device ( 16 ) each have a heat exchanger ( 19 , 21 ) arranged in the water bath ( 13 ).

12. The method according to claim 11 , characterized in that the temperature of the water bath ( 13 ) is controlled at a temperature ranging from 10° C. to 100° C. by means of the heating device ( 15 ) and the cooling device ( 16 ).

13. The method according to claim 11 , characterized in that a heat exchanger ( 19 ) of the heating device ( 15 ) and a heat exchanger ( 21 ) of the cooling device ( 16 ) are each arranged in the water bath ( 13 ) in a duct ( 34 ) of a flow system ( 33 ) of the humidifier ( 32 ), a partial amount of water ( 38 ) of a total amount of water ( 39 ) of the water bath being controlled in temperature within the respective duct by means of the respective heat exchanger.

14. The method according to claim 13 , characterized in that the partial amount of water ( 38 ) is controlled in temperature by means of a temperature deviating from a residual amount of water ( 40 ) of the total amount of water ( 39 ).

15. The method according to claim 13 , characterized in that the air bubbles ( 18 ) rise in the water bath ( 13 ) within the hollow profile ( 37 ) of the duct ( 34 ), an upper edge of the hollow profile being arranged above a water level ( 27 ) of the water bath.

16. The method according to claim 15 , characterized in that the air bubbles ( 18 ) rise in the partial amount of water ( 38 ) and increase the water level ( 27 ) within the hollow profile ( 37 ) with respect to the water level outside of the hollow profile.

17. The method according to claim 15 , characterized in that the air bubbles ( 18 ) rise in the partial amount of water ( 38 ) and convey the partial amount of water out of the hollow profile over the upper edge of the hollow profile ( 37 ) in such a manner that the partial amount of water is mixed with a residual amount of water ( 40 ) of the total amount of water ( 39 ).

18. The method according to claim 11 , characterized in that the aerosol-free air is generated at a temperature ranging from 10° C. to 100° C. by means of the temperature-control system ( 14 ) and the ventilation system ( 17 ) and is conveyed through the container opening ( 28 ) to the test space.

19. The method according to claim 11 , characterized in that the test space is dehumidified via an open positive-pressure valve in the test space, aerosol-free air being generated at a temperature ranging from 2° C. to 30° C. by means of the temperature-control system ( 14 ) and the ventilation system ( 17 ) and being conveyed through the container opening ( 28 ) to the test space.

20. The method according to claim 11 , characterized in that aerosol-containing air is generated by means of the heat exchanger ( 19 ) of the heating device ( 15 ) by boiling the partial amount of water ( 38 ) by means of the temperature-control system ( 14 ) and the ventilation system ( 17 ) and is conveyed through the container opening ( 28 ) to the test space.

21. The method according to claim 11 , characterized in that an air flow from the container interior ( 12 ) to the test space is realized between the container interior and the test space by means of a difference in partial pressure generated by the ventilation system ( 17 ).

22. The method according to claim 11 , characterized in that an air flow from the container interior ( 12 ) to the test space is introduced into the test space at a ventilator arranged in the test space.

23. The method according to claim 11 , characterized in that a humidity constant is controlled in the test space at a tolerance of <±1% relative air humidity by means of a control device of the humidifier ( 10 , 32 ).