A WATER DISTRIBUTION SYSTEM WITH AUTOMATIC HOT WATER PASTEURIZATION PROCEDURE

Abstract

The present invention describes a water distribution system 1 comprising a water supply, a heating source 100, at least one temperature sensor, a flow path for water with a user outflow UO, and a control unit for operation of the water distribution system 1 said temperature sensor being connected to the control unit, wherein the control unit also is connected to at least one presence sensor PS arranged for the detection of presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO and wherein the control unit is arranged to drive a hot water pasteurization procedure of at least a portion of the flow path and out from the user outflow UO based on a response or an indication of no presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO.

Claims

1. A water distribution system comprising a water supply, a heating source, at least one temperature sensor, a flow path for water with a user outflow, and a control unit for operation of the water distribution system, said temperature sensor being connected to the control unit, characterized by that the control unit also is connected to at least one presence sensor arranged for the detection of presence of a human or animal body in physical proximity to the user outflow and/or in an outflow direction area from the user outflow and wherein the control unit is arranged to drive a hot water pasteurization procedure of at least a portion of the flow path and out from the user outflow based on a response or an indication of no presence of a human or animal body in physical proximity to the user outflow and/or in an outflow direction area from the user outflow.

2. The water distribution system according to claim 1, wherein said at least one presence senor is a motion sensor, an IR sensor, a radar sensor or a combination thereof, preferably a radar sensor or a radar sensor combined with another sensor.

3. The water distribution system according to claim 1 or 2, wherein said at least one presence senor is a motion sensor, an IR sensor, a radar sensor or a combination thereof, preferably a radar sensor or a radar sensor combined with another sensor.

4. The water distribution system according to claim 1, wherein the water distribution system is a water recirculation system.

5. The water distribution system according to claim 4, wherein the water recirculation system is a recirculating shower.

6. The water distribution system according to claim 1, wherein said at least one presence sensor is connected to the control unit.

7. The water distribution system according to claim 1, wherein a flow control unit is connected to the control unit.

8. The water distribution system according to claim 7, wherein the flow control unit is a flow meter located in the flow path.

9. The water distribution system according to claim 1, wherein a timer unit is connected to the control unit.

10. The water distribution system according to claim 1, wherein the water distribution system is a water recirculation system intended for recycling of water or discarding of water not suitable to recycle, said water recirculation system comprising a flow path for recirculation, at least one water treating unit, and a sensor unit arranged for measurement of at least water quality, and wherein the sensor unit is connected to the control unit which decides if water should be recycled or discarded in a point of separation based on the measurement of the water quality, said water recirculation system also comprising a heating source and a user outflow arranged at the end of the flow path for recirculation, and wherein the control unit is arranged to drive a hot water pasteurization procedure of at least a portion of the flow path and out from the user outflow based on a response or an indication of no presence of a human or animal body in physical proximity to the user outflow and/or in an outflow direction area from the user outflow.

11. A method for performing a hot water pasteurization procedure in a water distribution system according to claim 1, said method comprising controlling that no human or animal body is positioned in a risk zone by using said at least one presence sensor which is connected to the control unit driving the pasteurization procedure; and flowing hot water in at least part of the flow path for water and out from the user outflow when there is a response or an indication from the presence sensor that no human or animal body is positioned in said risk zone.

12. The method according to claim 11, wherein a flow control unit is connected to the control unit and wherein the method comprises controlling the flow of hot water during the pasteurization procedure.

13. The method according to claim 11 or 12, wherein a timer unit is connected to the control unit, and wherein the timer unit sets the intended time for flowing hot water based on the temperature measured in the temperature sensor.

14. The method according to claim 11, wherein the water distribution unit comprises a flow control unit being connected to the control unit and a timer unit being connected to the control unit, and wherein the method comprises controlling temperature, flow and residence time of the hot water during the pasteurization procedure.

Description

DETAILED DESCRIPTION OF THE DRAWINGS

[0027] In FIG. 1 there is shown a water distribution system 1 according to one embodiment of the present invention. In this case, the water distribution system 1 may be connected to a water tap in a sink. The water distribution system 1 comprises a water supply, a heating source 100, at least one temperature sensor, a flow path for water with a user outflow UO, and a control unit for operation of the water distribution system 1, where the temperature sensor is connected to the control unit. Moreover, the control unit is also connected to at least one presence sensor PS arranged for the detection of presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO. According to this embodiment, the presence sensor PS may e.g. be arranged above the water tap so that the sensor PS may detect any type of presence of hands or the like in the sink.

[0028] Furthermore, the control unit is arranged to drive a hot water pasteurization procedure of at least a portion of the flow path and out from the user outflow UO based on a response or an indication of no presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO.

[0029] In FIG. 2 there is shown another embodiment of the present invention. In this case the water distribution system 1 is a water recirculation system 1 in the form a recirculating shower. The water recirculation system 1 is intended for recycling of water or discarding of water not suitable to recycle. Furthermore, the water recirculation system 1 comprises a flow path for recirculation 50, at least one water treating unit 6, which may be e.g. a filter or a UV unit or something else, and a sensor unit 7 arranged for measurement of at least water quality. The sensor unit 7 is connected to the control unit (see dotted lines) which decides if water should be recycled or discarded in a point of separation 30 based on the measurement of the water quality. Moreover, the water recirculation system 1 also comprises a heating source 100 and a user outflow UO arranged at the end of the flow path for recirculation 50. The control unit is arranged to drive a hot water pasteurization procedure of at least a portion of the flow path and out from the user outflow UO based on a response or an indication of no presence of a human or animal body in physical proximity to the user outflow UO and/or in an outflow direction area from the user outflow UO.

[0030] It should be noted that the heating source 100 and the water treating unit 6 may be one and the same unit, i.e. only hot water is used to treat the water. Moreover, the water treating unit 6 may also be in a combined unit, such as a combined UV and heater unit. Furthermore, the water treating unit 6 may also be in a separate unit, such as shown in FIG. 2. In this case it is in the form a filter 6.

[0031] Also the heating source 100 may be complemented with several heating units, of same type or different. One possible solution is as a heat exchange arrangement. Moreover, also other types of external heating sources may be used, such as solar panels, LP gas etc. Suitably only hot water is used for heating, also in the case where solar panels or other heating sources are used. In such cases water is heated by the external source, and is then used in the water recirculation system 1.

[0032] It should also be noted that the sensor unit 7 may in fact comprise several sensors. Such sensors may be positioned at different places in the system. In the embodiment shown in the figures, one or several may be positioned in a drain 300 where the point of separation 30 may be located.

[0033] As seen in FIG. 1, fresh cold and hot water enters the system via a mixer arrangement.

[0034] In relation to the positioning of the presence sensor PS according to this embodiment, the sensor PS may e.g. be arranged in the bath room ceiling. It should, however, be noted that there may be several suitable positions, as long as it is possible to detect presence in a flow direction out from the user outlet or close proximity thereto. The positioning used is also dependent on the type of shower installation. As another example, the shower may be operated by a user panel and this user panel may also have an integrated presence sensor PS. It should also be noted that the presence sensor may in fact be a sensor which detects something which in turn is a probable indication of presence. As one possible example, the presence sensor PS or at least one sensor PS in a combined PS system may be a sensor positioned to detect if the shower door is opened/closed. Any type of opening or closing then is a detection of presence. This may function together with other sensor solutions. This also implies that for the detection of presence of a human or animal body in physical proximity to the user outflow (UO) and/or in an outflow direction area from the user outflow (UO) a presence sensor does not have to detect this directly but may detected this both indirectly and/or directly.

[0035] One other sensor solution possible according to the present invention may be to also combine the present invention with so called smart home solutions. As an example, if a smart home system knows that no one is at home, or that all possible users are positioned at a distance from unsafe places, then a hot water pasteurization procedure may be performed. Such a smart home solution may also be combined with one or more presence sensors PS as described above. To combine the different sensors like this may imply that a simpler presence sensor PS may be used according to the present invention.

[0036] Furthermore, and as mentioned above, the sensor PS may be only one unit or several, possibly also of different types. According to one embodiment, the system 1 comprises both a IR sensor and another type of motion sensor.