Water distribution network and method of operating a water distribution network.

Abstract

The present invention proposes a water distribution network (10) comprising at least one water line (4) extending from a water source outlet and supplying at least one loop (18) supplying a plurality of water distribution points (5) between the water line (4) and a return line (4'). A plurality of sensors (20, 21) are provided in the water distribution network (10) to obtain current values ​​of water parameters, the water parameters including at least the water velocity and / or temperature. A network monitoring module (70) adapted to receive the current values ​​of water velocity and / or temperature from the plurality of sensors (20, 21) is also proposed. A method for operating such a water distribution network is also proposed. Figure for the abstract: Fig 1

Description

Title of the invention: Water distribution network and method for operating a water distribution network. Technical field

[0001] The present invention relates to the field of water distribution in buildings, the operation of a cold or hot domestic water distribution network, and a method for operating the water distribution network for domestic hot water management. More specifically, the present invention relates to a water distribution network and a method for operating a water distribution network. PRIOR ART

[0002] It is important to know the temperature and velocity of the water circulating in the water distribution network for the distribution of domestic hot water throughout all levels or pipes of the network. The water distribution network is, for example, a residential building, and more specifically, a hospital or a nursing home. It is also important to ensure good water circulation in order to limit the proliferation of bacteria in the event of water stagnation throughout the network's pipes. Water temperatures below 55°C at low velocities can create a risk of Legionella growth.

[0003] To prevent water stagnation in the building's pipes, it is also essential to know the water flow velocity in at least one pipe in the building, particularly in the hot water return loops. The water flow velocity can vary depending on the complexity of the pipe installation, the number of floors in the building, or the distance between the pipe and the hot water source. Water velocity and temperature are closely correlated: indeed, when the water velocity decreases in a branch of the network, the temperature also decreases, increasing the risk of bacterial growth such as Legionella.

[0004] Currently, existing water quality monitoring systems allow for the measurement of water temperature and velocity at specific points on each pipe in the network. Water velocity is primarily measured in main pipes or pipelines, most often at the network inlet. Such water velocity measurements provide a limited view of the water velocity status in the terminal branches near the points of use.

[0005] Prior art water temperature measurements consist of taking a quantity of water from a pipe in a water distribution network pipeline and measure the temperature of the water sampled in order to determine the temperature of the water in said water distribution pipe.

[0006] However, such a method of measuring the water temperature in each pipe does not offer high precision because a certain amount of time has already elapsed between the water sampling and the temperature measurement. During this time, the water temperature may drop, resulting in an inaccurate measurement of the water temperature in the pipes of the water distribution network.

[0007] Furthermore, for this type of measurement, the water flow in the selected pipe of the water distribution network must be stopped in order to draw water from the pipe. By measuring the water temperature in this way, the water circulation throughout the entire building can be disrupted, and the risk of bacterial penetration during water sampling is higher.

[0008] There are also collar systems that are placed outside the pipe, but these systems are not very precise. Thermowells inserted into a tee on the network have also been developed, but this system also has considerable inertia in the measurement, impedes water flow, and is susceptible to corrosion because it is made of metal.

[0009] It is known in the prior art of devices for measuring water velocity as described in patent application FR 30 35 963 Al. These prior art devices make it possible to measure the water flow rate at a point in each pipe of the network.

[0010] However, each point measurement in each pipe of the network is a long process which does not allow for instantaneous assessment of the status of water circulation and water temperature in the entirety of the water distribution network.

[0011] One of the objects of this disclosure is to provide a method and system for monitoring water quality.

[0012] One of the objects of this disclosure is to provide a method and a system for anticipating and controlling the risk of water contamination. Summary of the invention

[0013] To this end, the invention proposes a water distribution network comprising: at least one water line extending from a water source outlet and supplying at least one loop supplying a plurality of valves (water distribution points) between the water line and a return line, the loop comprising a return pipe downstream of the plurality of valves (water distribution points) opening into the return line; at least one balancing valve in the return line. A plurality of sensors is provided in the water distribution network to obtain current values ​​of water parameters, the water parameters including at least the water velocity and / or temperature. A network monitoring module is provided, adapted for receive current water velocity and / or temperature values ​​from the plurality of sensors, compare the received current water velocity and / or temperature values ​​with predetermined parameter values ​​to monitor the state of the water distribution network, and activate at least one of a display mode to produce at least one display with current values ​​and / or network status, an alert mode to produce an alert on current values ​​and / or network status, and a control mode to send control signals to at least one balancing valve based on current values ​​and / or network status.

[0014] Thus, the present invention proposes a network that facilitates monitoring the status of the water distribution network and provides traceability. This facilitates the management and maintenance of the water distribution network.

[0015] Furthermore, unlike the prior art where flow rate is often measured, the present invention proposes monitoring velocity to ensure that the water does not stagnate and that the velocity complies with regulatory requirements. Monitoring velocity makes it possible to ensure that the network is properly balanced.

[0016] In one embodiment, the network comprises several loops, in which each loop includes a pipe for distributing water to a plurality of valves / water distribution points via a plurality of pipes; and a return pipe downstream of the last pipe opening into the return line, with a balancing valve in the return pipe. At least one of the sensors is located in the return line.

[0017] Thus, in a closed system in which several loops are planned, placing the sensor at the output makes it possible to ensure the conformity of the network as a whole.

[0018] Having the inlet and return values ​​allows for a comparison to observe temperature or velocity losses across the network as a whole. Additional sensors can be installed in the return line and / or adjacent to the balancing valve to improve monitoring and more precisely identify the state of the network, for example, in each of the loops.

[0019] In one embodiment, the plurality of sensors is installed in a data acquisition module, the data acquisition module comprising a housing with a screen for displaying or indicating the current values ​​of water parameters, in particular with a removable screen. A data acquisition module preferably contains two sensors, but several modules can be installed, connected via Bluetooth to a data aggregator. Several sensors can be installed that transmit data to the same data aggregator, for example via Bluetooth. This aggregator is an electronic device that is not necessarily installed on the water network.

[0020] In addition, the removable screen allows it to be easily positioned or oriented to facilitate data reading.

[0021] In one embodiment, the network monitoring module further includes an operating interface adapted to receive inputs from a user and output one or more pieces of information or requests to the user, information such as predetermined ranges of water temperature and / or pressure, and requests to the user such as the actuation of at least one balancing valve and / or at least one temperature controller.

[0022] The user can thus adapt the parameters to the network and to certain network-related specificities, or can choose to follow a parameter over a range that he defines according to his needs.

[0023] The network monitoring module can be configured to generate an alarm signal if the received values ​​are outside a predetermined / preselected range. This allows the user to monitor the network status and be notified if the network is not compliant.

[0024] In one embodiment, the network monitoring module is adapted to actuate at least one balancing valve and / or at least one temperature controller if any of the current water parameter values ​​are outside a predetermined / preselected range. This allows the network to be maintained even if the user is not on site, or if some valves are not easily accessible.

[0025] In one embodiment, the predetermined / preselected range of one of the actual values ​​of the water parameters is the water velocity and / or the water temperature, in particular the predetermined range of velocity is between 0.1 m / s and 2 m / s and the predetermined range of water temperature is between 20 and 90 degrees, and more particularly between 50 and 80 degrees.

[0026] In one embodiment, the velocity sensor is an ultrasonic flowmeter, preferably coupled with a temperature sensor. By coupling the two sensors together, more precise monitoring is obtained, since the measurements are taken at the same measurement point. Furthermore, a compact arrangement can be achieved. One of the advantages of using ultrasonic flowmeters to measure water velocity is the absence of direct contact with the water by the flowmeter. No part of the ultrasonic flowmeter is in contact with the water, which is particularly advantageous for maintaining good water quality.

[0027] In one embodiment, the speed sensor comprises a first sensor and a second sensor installed on an outer wall of a measuring tube, preferably in a first tubular segment and a second tubular segment respectively, with at least one of the following characteristics: the axis Bl' of the first sensor and the B2' axis of the second sensor are substantially perpendicular to the A' axis of the measuring tube; the Bl' axis of the first sensor and the B2' axis of the second sensor form an angle with the axis of the measuring tube between 15° and 75° or an angle formed by the intersection of the Bl' axis of the first sensor and the B2' axis of the second sensor is between 30° and 150°; the first sensor and the second sensor are located substantially on the same Cl', C2' axis which form an angle with the A' axis of the measuring tube between 15° and 75°.

[0028] Ultrasonic flow meters have no moving parts subject to wear, making them reliable over time. Integrating ultrasonic flow meters does not require changing the tube cross-section, which could potentially cause pressure losses. Ultrasonic flow meters offer high accuracy in measuring water velocity.

[0029] The angles between the sensors allow the accuracy of the measurement to be increased.

[0030] The first and second sensors can be installed on the outer wall of the measuring tube, which is connected to the inlet line, pipe, conduit, or return line by an ultrasonic gel. Using an ultrasonic gel or coupling resin between the sensors and the surface of the measuring tube increases the accuracy of the water velocity measurements.

[0031] The present invention also proposes a method for operating a water distribution network as described, the method comprising obtaining current values ​​of water parameters by a plurality of sensors provided in the water distribution network, the water parameters comprising at least the velocity and / or temperature of the water; receiving by a network monitoring module the current values ​​of the velocity and / or temperature of the water from the plurality of sensors; comparing, by the network monitoring module, the current values ​​of the velocity and / or temperature of the water received with predetermined parameter values ​​to monitor the state of the network by the water distribution network monitoring module;and activate, via the network monitoring module, at least one of the following: a display mode to produce at least one display with current values ​​and / or the network status, an alert mode to produce an alert on current values ​​and / or the network status, and a control mode to send control signals to at least one balancing valve based on current values ​​and / or the network status.

[0032] In one embodiment, the method comprises obtaining current values ​​of the water parameters by a plurality of sensors in the return line, and preferably in the return line and / or adjacent to the balancing valve.

[0033] The method may include entering predefined ranges or thresholds through an operating interface of the network monitoring module.

[0034] In one embodiment, the method includes actuating by the network monitoring module at least one balancing valve and / or at least one temperature regulator if one of the current values ​​of the water parameters is outside a predetermined / preselected range.

[0035] In one embodiment, the method includes generating an alarm signal by a network monitoring module if the received values ​​are outside a predetermined / preselected range. DESCRIPTION OF THE DRAWINGS

[0036] The invention is described below with reference to the accompanying drawings, Figures 1 to 12, in which:

[0037] [Fig-1] is an overview of a water distribution network according to the present disclosure.

[0038] [Fig.2] is an overview of another embodiment of the network of water distribution according to this disclosure.

[0039] [Fig.3] is an example of a data acquisition module.

[0040] [Fig.4] is an overview of a network monitoring system.

[0041] [Fig. 5] is an overview of a method for operating a distribution network of water.

[0042] [Fig.6] is an example of an operating interface for the monitoring system of the network.

[0043] [Fig.7] is an overview of a first embodiment of a sensor speed.

[0044] [Fig.8] is another overview of the speed sensor of [Fig.7].

[0045] [Fig.9] is an overview of a second embodiment of the sensor speed.

[0046] [Fig. 10] is an overview of a third embodiment of the speed sensor.

[0047] [Fig. 11] is an overview of a second embodiment of the speed sensor comprising a temperature sensor.

[0048] [Fig. 12] is an overview of an integrated module with a temperature sensor and a speed sensor. DETAILED DESCRIPTION

[0049] Fig. 1 illustrates a water distribution network 10 according to the present disclosure.

[0050] As will be apparent from the following description, the distribution network is a domestic hot water distribution network, typically multi-looped.

[0051] The water distribution network includes one or more water sources 1, which may be tap water or mains water. The water in the water source 1 can be at cold, ambient, lukewarm, or hot temperature. A heating device 2 can be connected to the water source 1 to heat the water to the required temperature.

[0052] The water distribution network 10 comprises at least one water line 4 extending from an outlet 3 of the water source 1 and serving a plurality of loops 18 serving a plurality of water distribution points 5 between the water line 4 and a return line 4', also called the return manifold line.

[0053] Each loop 18 includes a pipe 11 for distributing water to the plurality of water distribution points 5 via a plurality of pipes 9. Downstream of the last pipe 9, the pipe 11 is looped with a return pipe 11'. The water flowing in the return pipes 11' returns to the return line 4', and then to the heating unit 2. A circulator 13 for circulating the water is placed at the end of the return line 4'.

[0054] In the example illustrated in [Fig.1], there are three loops 18. This is given for illustrative purposes only.

[0055] The water distribution point 5 can be a water outlet such as a tap, a thermostatic tap, a shower, located on one or more pipes 9 of the water distribution network 10.

[0056] A water meter valve 6 may be provided at the outlet 3 of the water source 1. The water meter valve 6 allows the quantity of water used in the water distribution network to be measured. The water meter valve 6 may include a device for measuring the water temperature at the outlet 3 of the water source 1. The water temperature measured in the water meter valve 6 may be compared with the temperatures measured by one or more temperature sensors 21 installed on at least one water line 4 and / or in the plurality of pipes 11, 11' and / or in one or more conduits 9 of the network, as will be explained below.

[0057] Water meters can also be installed in the loops, for example next to the water distribution points. This makes it advantageous to monitor the volume of water consumed and to detect any leaks.

[0058] The hot water temperature at outlet 3 of water source 1 is typically between +50°C and +100°C, preferably between +60°C and +90°C, and more preferably between +65°C and +75°C. This is only one example of the water temperatures at outlet 3 of water source 1, but other water temperatures may also be used.

[0059] In the example described, each return line 11' includes a balancing valve 7 which is arranged in the return line 11' to regulate the flow and / or velocity of the water in the network 10, i.e., one or more lines 11, conduits 9 and one or more return lines 11' of the network 10.

[0060] This example is not limiting and it is possible to have pipes without a balancing valve.

[0061] The balancing valve 7 can be a differential pressure balancing valve, a static balancing valve, or a dynamic balancing valve. For example, the HTA® balancing valve is used. This balancing valve meets the technical and hygienic requirements of buildings and is resistant to corrosion and abrasion, thus reducing the risk of damage. The HTA balancing valve is designed to be cleaned without shutting off the water supply.

[0062] As will be explained below, the balancing valve 7 is triggered and adjusted manually. Alternatively, the balancing valve 7 can be operated by a valve actuation box, controlled by a network monitoring module 70.

[0063] The balancing valve 7 can be triggered or adjusted when one or more of the current water parameter values ​​are outside predefined ranges or exceed a predetermined threshold. The water parameters are, for example, the water temperature and velocity measured respectively by a temperature sensor 20 and a velocity sensor 21.

[0064] A plurality of sensors 20, 21 can be attached to a data acquisition module 30 as explained below. In the illustrated embodiment, a data acquisition module contains only two sensors, but several modules can be installed, connected via Bluetooth to a data aggregator. Several sensors can be installed that transmit data to the same data aggregator, for example via Bluetooth. This aggregator is an electronic device that is not necessarily installed on the water network.

[0065] In the example of [Fig. 1], a first data acquisition module 30 is provided at the outlet of the water source 3, on the water line 4, and a second data acquisition module 30 is provided on the return line 4', at the end of the return line 4'. The plurality of sensors 20, 21 makes it possible to obtain current values, also called current values, of water parameters such as temperature and water velocity.

[0066] It is also possible to consider obtaining other parameters such as pH, water pressure, water flow rate, volume of water consumed, or the oxidation-reduction potential of water in order to monitor water quality and network operation.

[0067] By positioning the data acquisition modules 30 in this way, at a minimum, the inlet and return water parameter values ​​of the network 10 can be obtained. If the values ​​obtained at the end of the return line 4' are within an expected range, it can be assumed that the values ​​will also be within an expected range on each loop 18 of the network 10. Having the inlet and return values ​​allows for a comparison to observe temperature or speed losses on the network as a whole.

[0068] In another example of the water distribution network 10 illustrated in [Fig.2], in addition to the first and second data acquisition modules 30, at the outlet 3 of the water source and at the end of the return line 4', other data acquisition modules 30 are located on the return pipes 11' before the balancing valves 7. This position of the sensors 20, 21 makes it possible to measure the temperature and velocity of the water directly in each loop 18 of the network 10. In [Fig.2], an additional data acquisition module 30 has also been positioned on the return line 4', in addition to the terminal module at the end of the return line 4'.

[0069] This arrangement of the data acquisition modules 30 allows for more precise monitoring of the network 10, which includes the plurality of loops 18, some of which are located far from the water source 3 and in which the water flows at a reduced rate. Indeed, when water flows through pipes 11 and conduits 9 and passes through a number of obstacles called hydraulic components (for example, elbows, fittings, valves), friction and changes in direction cause losses in water flow. As the water progresses through the network 10, this results in a decrease in pressure within the pipe 11, 11', a decrease in pressure between the inlet and outlet of the obstacle, or reductions in the cross-section of the pipes.

[0070] Knowing the speed and temperature of the water in each return pipe 11' and in the return line 4' is particularly advantageous because it allows for precise monitoring of the condition of the water distribution network 10 and better distribution of flow rates or speed and thus stable temperatures.

[0071] The data acquisition module 30, comprising the sensors 20, 21, can also be located adjacent to one or more water distribution points 5. This positioning of the sensors 20, 21 allows the temperature and velocity of the water to be measured before it is distributed to users by one or more water distribution points 5. Detailed description of the modules

[0072] Fig. 3 illustrates a data acquisition module 30. The data acquisition module 30 comprises a housing 31 containing the sensors 20, 21. In the described embodiment, the sensors are in the same housing 31, but they can also be arranged in different housings.

[0073] Embodiments of sensors 20, 21 will be described later, with reference to Figures 7 to 12.

[0074] The housing 31 comprises a first cover 3la and a second cover 31b configured to cooperate in order to allow reversible attachment of the housing 31. The space formed between the first cover 31a and the second cover 31b includes the sensors 20, 21. The sensors 20, 21 are preferably fixed in a fixed and sealed manner.

[0075] The housing 31 includes a microcontroller 32 which is configured to process the data measured by the temperature sensor 20 and the speed sensor 21, and to display the current value of the water speed and the current value of the water temperature.

[0076] The housing 31 may include a screen 33 or another visual interface or another audible means for displaying or indicating the value of one or more water parameters. One or more water parameters and / or the parameters of the data acquisition module 30 may be displayed on the screen 33 in response to pressing display buttons 34.

[0077] The screen 33 is preferably removable, so that it can be easily positioned or oriented to facilitate reading the data.

[0078] In a non-limiting example, the housing 31 includes the balancing valve 7, and / or the housing 31 is coupled to the balancing valve 7. In this way, the regulation of the water flow in the pipe 11, 11' can be managed and operated by the same housing 31 as the data acquisition module 30. The balancing valve 7 being adjacent to the data acquisition module 30 allows the water flow regulation to be operated more quickly.

[0079] The data acquisition module 30 includes a power supply such as a battery, a cell, or a power cable. The data acquisition module 30 may include the flow meter reference and / or the water temperature reference and other parameters necessary to calculate the water velocity and / or temperature.

[0080] Figure 4 illustrates a network monitoring system 80.

[0081] The network monitoring system 80 includes the monitoring module 70 in communication with the data acquisition modules 30. The data acquisition modules 30 are connected to a sensor management module 40 by known means of communication such as an Ethernet or PoE (Power Over Ethernet) cable, a coaxial cable, a fiber optic cable, an Internet modem, Wi-Fi, 3G / 4G / 5G connection, Bluetooth, LiFi, infrared, an SPI link, a DSL cable, a USB cable.

[0082] The sensor management module 40 is configured to control the measurement taking by the data acquisition modules 30.

[0083] The sensor management module 40 can also be configured to convert the different speeds and temperature values ​​obtained by the data acquisition modules 30 into water speed and temperature. The sensor management module 40 manages the power supply to the data acquisition modules 30, thereby minimizing energy consumption.

[0084] In a preferred example, the data acquisition modules 30 are connected to the sensor management module 40 via Bluetooth, which is managed by a communication module 50 as illustrated in [Fig. 4]. The communication module 50 is configured to allow the data acquisition modules 30 to establish communication with the sensor management module 40 and to transmit the data acquired and calculated by the data acquisition modules 30.

[0085] The sensor management module 40 can also monitor the operation of the data acquisition modules 30 and the communication module 50.

[0086] An interface module 60 is provided to manage physical interactions with the user on the data acquisition module 30 or remotely. The interface module 60 also allows management of the screen 33 of the data acquisition module 30, control of indicator lights, and waking up the data acquisition module 30 when display buttons 34 on the screen 33 are pressed.

[0087] In a non-limiting example, the plurality of data acquisition modules 30 is connected to at least one aggregator in order to collect the data acquired by the data acquisition modules 30. One or more aggregators can collect data from a part of the water distribution network, for example, a room, a chamber, a floor, or a building. The data collected by one or more aggregators is transmitted to a network monitoring module 70 as illustrated in [Fig. 4].

[0088] One or more repeaters and / or routers may be present between the plurality of aggregators and the monitoring module 70 and / or the sensor management module 40. The connection between the plurality of aggregators may be established by a computer network, such as LAN, WAN, PAN, WAN, or VPN.

[0089] The sensor management module 40 can be connected to the monitoring module 70 or can be integrated into the monitoring module 70.

[0090] In one example, the data collected by the aggregator is sent to the router connected to the Internet. This data is then stored on a cloud-type server. The server transmits the data containing information on one or more parameters of the network water 10 to the monitoring module 70 via known wireless communication methods, such as an Internet modem, Wi-Fi, 3G / 4G / 5G connection, or Bluetooth. The monitoring module 70 can be a human-machine interface such as a telephone, a computer, or a web page.

[0091] The monitoring module 70 is adapted to receive data from one or more data acquisition modules 30. More specifically, the monitoring module 70 is adapted to receive the current values ​​of water velocity and / or temperature from the plurality of sensors 20, 21, and to compare the current values of speed and / or temperature of water received with predetermined parameter values ​​to monitor the state of the water distribution network 10.

[0092] The network monitoring module 70 can activate at least one display mode to produce at least one display indicating information on the current values ​​and / or the network status, and an alert mode to produce an alert on the current values ​​and / or the network status. The monitoring module 70 can also activate a control mode to send control signals to at least one balancing valve 7.

[0093] Information containing one or more parameters of the water from the water distribution network 10 is displayed on an operating interface 72 of the monitoring module 70, as illustrated in [Fig.5].

[0094] The operating interface 72 includes indicators allowing for the rapid and understandable assessment of the current state of the water flowing in the pipes 9 and / or in the return pipes 11 and / or in the water line 4 and the return line 4'.

[0095] For example, different colors and different tabs are used by the operating interface 72 when displaying information on the monitoring module 70. A first predetermined color 72a is used to indicate that the temperature or velocity of the water in one or more pipes 11 or return pipes 11' has exceeded a minimum or maximum threshold. A second predetermined color 72b is used to signal the absence of a signal from one or more water temperature and / or velocity sensors 20, 21. A third predetermined color 72c is used to indicate that the current water parameters are within predefined limits.

[0096] The minimum threshold is, for example, a water velocity or water temperature value lower than the user-defined values. The user-defined values ​​can be managed and entered by parameterization and acquisition software installed in the network monitoring module 70. The user can enter the predefined ranges or thresholds via the operating interface 72 of the network monitoring module 70. The user can also enter requests such as the actuation of at least one balancing valve 7 and / or at least one temperature controller 12 or modify the measurement parameters of sensors 21, 22.

[0097] The balancing valve 7 presents an obstacle to the circulation of water and with balancing valve 7 partially closed at the end of loop 18 of the return line 11', the flow of water is reduced in loop 18. By opening the balancing valve 7, the flow of water is increased.

[0098] For example, as soon as the water temperature in one or more pipes 11 and / or several pipes 11' is below 55°C, the tab color displaying the The status of this pipe 11 is then changed to the first predetermined color 72a. In another non-limiting example, when a current parameter reaches or exceeds a minimum or maximum threshold, a notification or indicator light can be emitted on the operating interface 72 of the network monitoring module 70.

[0099] It should be understood that the maximum threshold is an upper limit of the user-defined values. For example, if the water velocity exceeds 3 m / s, an audible or visual signal or alert can be emitted on the network management application installed on a telephone, computer, or web page to signal the potential problem in the water distribution network 10.This means of displaying information makes it possible to detect the problem related to the water distribution in advance and without physically checking in a building of the network 10 the current values ​​of the water in each pipe 9 or each conduit 11, 11'. .

[0100] The display with different colors has the advantage of directly distinguishing pipes 9 or conduits 11, 11' that have a problem with the current water parameters or a problem related to the absence of a signal from one of the sensors 20, 21. The user can be spared the need to manually compare the current water values ​​with the reference values ​​or to check the status of each pipe 9 or each conduit 11 since the information is directly displayed and presented in an understandable way on the operating interface 72 such as a screen of the network monitoring module 70. The user can receive notifications such as SMS, emails or messages in the application on the phone or computer.

[0101] The parameterization and acquisition software installed in the network monitoring module 70 is also configured to define the current values ​​for the minimum or maximum threshold of water parameters. The user can specify the measurement frequencies of the water parameters.

[0102] Certain parameters may be fixed, such as in a non-limiting example, the frequency of the ultrasonic waves, the delay between the excitation of the ultrasonic waves, the number of ultrasonic pulses, the delay between measurements of the speed or temperature of the water, the calibration factor of the flow rate or temperature of the water relative to the reference values ​​of the flow rate or speed of the water, the frequency of measurements per day or per hour, the amplification of the signal.

[0103] The user can enter the limits of the water values, the parameters of the software of acquisition parameters via the operating interface 72, for example, using screen buttons or voice commands.

[0104] It can also be envisaged that, when the minimum or maximum threshold is reached or exceeded, the user can choose to verify that one of the current water values ​​is indeed outside the required limits and measure these parameters again. current water values. If the current water values ​​remain outside the required limits, the user can manually operate the valve actuation box to change the flow in the network or in the pipe 11, 11' of network 10 or operate the temperature regulator 12 to change the temperature of the heating unit 2.

[0105] By manually operating the system, the user can verify that the balancing valves 7 have been correctly actuation and check within a certain timeframe whether the current values ​​have returned to the required values. In the event of a failure or malfunction of the balancing valve 7, the user, being directly on site, can correct the detected problems.

[0106] In another embodiment, the user can use the parameterization and acquisition software to automatically actuate the valve actuation unit and / or the temperature controller 12. The valve actuation unit triggers one or more balancing valves 7. The balancing valve 7 can be positioned at the inlet of one or more pipes 9 and / or the conduit 11 and / or the conduit 11'. When the user activates the regulation of one or more water values ​​in response to an alert in the network monitoring module 70, the parameterization and acquisition software sends control signals to one or more valve actuation units and / or the temperature controller 12 to modify the current water values.

[0107] In a non-limiting example, when the water velocity in one of the pipes 11, 11' is less than 0.3 m / s, the user actuates the valve actuation unit via the parameterization and acquisition software. The valve actuation unit triggers the balancing valve 7 located in the pipe 11 where water stagnation has been detected by the velocity sensor 21. The balancing valve 7 increases the flow rate of the water circulating in this pipe 11, 11' in order to regulate the velocity within the water velocity limits required by the user. For example, the user can define the water velocity limits between 0.1 m / s and 3 m / s. By measuring the water velocity, it is possible to detect potential areas of water stagnation and dead legs in the network where water does not flow. We can also consider increasing the speed of the water circulator 13.

[0108] Water temperature regulation can be applied by the temperature controller 12 if the water temperature in pipe 9 or in conduit 11, 11' is outside the thresholds defined by the user. This remote management of current water values ​​makes it possible to control and adjust any current water values ​​that are outside the defined limits without the physical presence of a specialist who would manually modify the water temperatures of the heating appliance 2 or the water flow rate in one or more conduits 11, 11' of the network 10.

[0109] One of the advantages of automating network monitoring is the ability to adjust the current water values ​​in the network 10 or in certain parts of the network 10 during hours when a network monitoring professional is unavailable or would not be readily available, for example, at night or on weekends. Regulating water values ​​in this way is faster than manually operating all or several balancing or temperature valves in one or more pipes 11 or in one or more conduits 9 located on multiple levels of the building, for example.

[0110] Manual actuation proves to be less rapid and efficient due to the greater time required to manually actuate the plurality of balancing valves in the plurality of pipes 11, particularly in the case of a complex network. Automated actuation can be performed via the human-machine interface of the monitoring module 72 on the plurality or all of the pipes 11, 11' without necessarily being near the network 10.

[0111] Another advantage of the automation presented in this application is the regulation of current water values ​​by a user who is not necessarily the boilermaker or pipefitter specialist. Regulation of current water values ​​can be performed by any user because the current water parameters, whether above or below the required thresholds, are already programmed into the parameterization and acquisition software. The user only needs to activate one or more pressure and / or temperature controllers using the buttons on the screen of the network monitoring module 70 if the current water values ​​are outside the programmed limits.

[0112] In one embodiment, the regularization of the current water values ​​is carried out automatically by the network monitoring module 70 without user intervention as soon as one of the current values ​​of the water parameters is outside a predetermined / preselected range.

[0113] Figure 6 illustrates a method for operating the water distribution network. In a first step, current values ​​of the water parameters are measured (SI) by the plurality of sensors 20, 21.

[0114] In a second step, the current speed and / or temperature of the water are determined (S2) from the current values ​​received by the data acquisition module 30.

[0115] In a third step, the values ​​of the velocity and / or temperature of the water are sent (S3) from the data acquisition module 30 to the network monitoring module 70.

[0116] In a fourth step, the values ​​of the speed and / or temperature of the water are received (S4) by the network monitoring module 70.

[0117] In a fifth step, the received water velocity and / or temperature values ​​are compared (S5) with parameter values ​​predetermined by the network monitoring module 70.

[0118] In a sixth step, at least one predetermined display is produced (S6) based on the comparison between water velocity and / or temperature values ​​received from the data acquisition module 30 and predetermined values ​​to diagnose the condition of the water distribution network 10. Detailed description of the sensors

[0119] Embodiments of the sensors are now described, with reference to Figures 7 to 12.

[0120] The water velocity can be measured by at least one velocity sensor 21. The velocity sensor 21 is, for example, a vane flow meter, an electromagnetic flow meter, a differential pressure flow meter, a vortex flow meter, an ultrasonic flow meter, or a Coriolis flow meter. These are just a few examples of water velocity sensors, but other water velocity sensors can also be used.

[0121] In one embodiment, an ultrasonic flow meter is used. One of the advantages of using ultrasonic flow meters to measure water velocity is the absence of direct contact between the flow meter and the water. In some ultrasonic flow meter designs, no part of the ultrasonic flow meter is in contact with the water, which is particularly advantageous for maintaining good water quality. Ultrasonic flow meters have no moving parts susceptible to wear, making them reliable over time. Integrating ultrasonic flow meters does not require changing the tube cross-section, which could potentially cause pressure losses. The ultrasonic flow meter offers high accuracy in measuring water velocity.

[0122] In a first embodiment illustrated in [Fig.7] (sectional view) and [Fig.8], the speed sensor is a flow meter 121 called "Mirrors reflect".

[0123] The ultrasonic flow meter (for example, the velocity sensor 121) is placed in a pipe 11, 11', which may be the inlet line, a pipe 9 or a pipe 11, 11' or the return line 4'. In what follows, the sensor is described when placed in a pipe 9.

[0124] The speed sensor 121 comprises at least two sensors - a first sensor 121a and a second sensor 121b. The first sensor 121a and the second sensor 121b are placed on a measuring tube 130 having an inlet 130a and an outlet 130b.

[0125] The inlet 130a of the measuring tube 130 is connected to the pipe 9 by means of known pipe fittings. Water enters the measuring tube 130 through the inlet 130a and exits through the outlet 130b into the same pipe 9 without the The water flow may be disturbed or reduced. During the passage of water through the measuring tube 130, the water velocity is measured by the velocity sensor 121.

[0126] In a first case, the ultrasound is first emitted by the first sensor 121a in the direction of the water flow and is received by the second sensor 121b. The time traveled TAB between the emission of the ultrasound and the reception of the ultrasound in the first case is measured.

[0127] Next, in a second case, the ultrasound waves are emitted by the second sensor 121b and received by the first sensor 121a. In this second case, the ultrasonic wave is emitted in the opposite direction to the water flow. This ultrasonic wave is slowed down by the water flow. The time elapsed TBA between the emission and reception of the ultrasound waves in this second case is measured.

[0128] The difference in travel time (TAB TBA) in the first and second cases is used to calculate the water velocity using the known cross-section of a pipe in the water distribution network 10 as described in equation 1:

[0129] BA~ cv

[0130] TAB, Tsa is the travel time of the ultrasonic waves between the first and second sensors 121a, respectively from A to B and from B to A (in seconds). L is the travel length of the ultrasonic waves (in meters), c is the speed of the ultrasonic waves in the water (in meters / second), and v is the speed of the water (in meters / second). From equation 1, the speed of the water can be determined according to equation 2: (Equation 2)

[0132] The difference in travel time A ToF in the first case (in the direction of water flow) and in the second case (the opposite direction of water flow) can be determined according to equation 3:

[0133] A TOF = TBA -T (equation 3)

[0134] The order of magnitude of this time difference A ToF is between 0.5 and 10 ns depending on the configuration and accuracy of the speed sensor 121 and the water speed.

[0135] The travel times T TBA depend essentially on the configuration of the speed sensor 121 such as the sensor position, the angle of inclination of the sensors, the material of the tubes. In a particular example, the travel times TTBA have very close values, within an order of magnitude of the times of path T^b, TBA between 10 and 100 ^s. In the particular example where the time difference A ToF is of small variations (1 ns for example), the following approximation can be applied according to equation 4:

[0136] TabX TbaO T2parcQm-,(equation4)

[0137] With the approximation of equation (4), equation (2) for determining the water velocity v becomes:

[0138] v = —T--X àToF = k* àToF ours (Equation 5)

[0139] Where the parameter k in equation (5) is the constant specific to the sensor configuration, for example, topology of speed sensor 121, reference of piezoelectric transducers, material of tube, means of connecting speed sensor 121 with tube.

[0140] The water velocity can therefore be determined by measuring the travel times of ultrasonic waves in the direction of water flow and in the opposite direction. The propagation speed of ultrasound in water is known, but this speed is likely to vary with the water temperature.

[0141] Equation (5) is also valid for embodiments in which the sensor 121 is immersed in the water tube.

[0142] The measuring tube 130 has a cylindrical body made, for example, of plastic, or more particularly of polyethylene (PE), cross-linked polyethylene (PER or PEX), polyethylene terephthalate (PET), high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), or polyvinyl chloride (PVC). In a preferred example, the material used for the measuring tube 130 is chlorinated poly(vinyl chloride) (CPVC). CPVC is a material with minimal risk of bacterial biofilm growth on the surface of the measuring tube 130. CPVC is suitable for the chemical treatments recommended by the French Directorate General of Health (DGS). CPVC exhibits high abrasion resistance in areas subjected to the mechanical stresses of the flow.Also, C-PVC has a low thickness and good transmission for ultrasonic waves, and these materials are particularly suitable for speed measurements by the ultrasonic sensor.

[0143] The velocity sensor 121 comprises two reflective mirrors 122a and 122b (as illustrated in Figure 1 and Figure 8). The first reflective mirror 122a is installed in the measuring tube 130 in the direction of water flow. The second reflective mirror 122b is installed in the measuring tube 130 in the opposite direction of water flow. The first sensor 121a and the second sensor 121b are installed on a side or outer wall of the measuring tube 130. facing the reflecting mirrors 122a and 122b (the second reflecting mirror 122b not being visible in [Fig.8]).

[0144] Ultrasonic waves are emitted by the first sensor 121a towards the first reflecting mirror 122a, which is positioned at 45 degrees in the direction of the water flow. The ultrasonic waves are reflected by the first reflecting mirror 122a in the direction of the water flow. These ultrasonic waves are received by the second reflecting mirror 122b, which is positioned at 45 degrees in the opposite direction of the water flow. The second reflecting mirror 122b reflects these ultrasonic waves back towards the second sensor 121b. The second reflecting mirror 122b is positioned substantially opposite the first reflecting mirror 122a.

[0145] The first sensor 121a is located on an axis Bl' and the second sensor 121b is located on an axis B2'. The axes Bl' and B2' are substantially perpendicular to the axis of the water flow A'. The axis Bl' is substantially parallel to the axis B2'. The reflecting mirrors 122a and 122b are substantially positioned on the axis of the water flow A'.

[0146] The second sensor 121b also emits ultrasonic waves towards the second reflecting mirror 122b, which reflects these ultrasonic waves towards the first reflecting mirror 122a. The first reflecting mirror 122a then reflects these ultrasonic waves back towards the first sensor 121a. The travel time of the ultrasonic waves in the direction of water flow and in the opposite direction of water flow is measured as described above.

[0147] It should be noted that this is a particular example with 45-degree positioning angles of the reflecting mirrors 122a, 122b, but the reflecting mirrors 122a, 122b can also be positioned with other angles between 15 and 75 degrees.

[0148] The two sensors 121a, 121b are fixed to the side of the measuring tube 130 by means of fasteners 123. In one example, these two sensors 121a, 121b are positioned in holes formed on the side of the measuring tube 130. A seal 124 ensures the sealing of the two sensors 121a, 121b positioned in said holes. Press plates 125 are placed on each of the two sensors 121a, 121b to immobilize the two sensors 121a, 121b in said holes. In one example, the two sensors 121a, 121b are fixed between the press plates 125 and the measuring tube 130 by means of screws 123.

[0149] In a second embodiment, illustrated in [Fig. 9], the speed sensor is a speed sensor 221 called "Reflect". As described in the first embodiment with the speed sensor 121, the speed sensor 221 with the measuring tube 130 is connected to one or more pipes 9 or conduits 11, 11' of the network 10.

[0150] The principle of emitting and receiving ultrasonic waves is the same as described in the first embodiment. However, in the second embodiment, a first sensor 221a and a second sensor 221b are positioned on the same side of the measuring tube 130 at a certain angle of inclination with respect to the axis of the water flow A'. The axis of inclination Bl' of the first sensor 221a and the axis of inclination B2' of the second sensor 221b with respect to the axis of the water flow A', in a non-limiting example, is between 15° and 75°. In a preferred example, the angle of inclination is 45°. Therefore, the angle between the first sensor 221a and the second sensor 221b can be between 30° and 150°.

[0151] In a variant of the second embodiment, the first and second sensors 221a, 221b are connected to the side of the measuring tube 130 by the fastening means as described in the first embodiment.

[0152] In a non-limiting example, the first and second sensors 221a, 221b are positioned in the orifices of the measuring tube 130 and fixed by the screws 123 to the measuring tube 130.

[0153] In the second embodiment, the measuring tube 130 comprises two tubular segments 230a, 230b which are adapted to house the two sensors 221a, 221b on the side of the measuring tube 130. In a non-limiting example, the first and second tubular segments 230a, 230b have a truncated cylindrical body. The first and second tubular segments 230a, 230b are fixed to the side of the measuring tube 130.

[0154] In a non-limiting example, the axis of rotation of the first tubular segment 230a and the axis of rotation of the second tubular segment 230b correspond substantially to the axes Bl', B2' of the two sensors 221a, 221b. The first tubular segment 230a is positioned on the side of the measuring tube 130 substantially opposite the second tubular segment 230b.

[0155] In one example, the first and second tubular segments 230a, 230b are formed as a single piece together with the cylindrical body of the measuring tube 130.

[0156] In another example, the first and second tubular segments 230a, 230b are fixed to the measuring tube 130 by means of fastening. The fastening means are, for example, magnets, a fastening collar, a fastening clip, a fastening adhesive, a coupling resin, or a tube gel for fixing the first and second tubular segments 230a, 230b to the side of the measuring tube 130.

[0157] In a preferred example, an ultrasonic gel is used, for example, gels known as coupling B2, coupling D12, coupling H-2, coupling 1-2. The ultrasonic gel allows the two tubular segments 230a, 230b to be hermetically sealed to the side of the measuring tube 130. The presence of air between the sensors 221a, 221b and the side of the measuring tube 130 can interfere with the water velocity measurements. Using ultrasonic gel or coupling resin between sensors 221a, 221b and the surface of measuring tube 130 increases the accuracy of water velocity measurements.

[0158] In the second embodiment of [Fig. 9], the first and second sensors 221a, 221b do not have contact with the water flowing in the measuring tube 130, which helps maintain good water quality and prevents water loss. The absence of contact with the water ensures that the water flow remains undisturbed by the presence of sensor elements such as the reflective mirrors 122a, 122b described in the first embodiment.

[0159] The ultrasonic waves emitted by the first and second sensors 221a, 221b are reflected from the inner surface of the measuring tube 130. This inner surface of the measuring tube 130 is opposite the mounting surface of the first and second sensors 221a, 221b. The measuring tube 130 may include a reflective rim on its inner surface that is opposite the mounting surface of the first and second sensors 221a, 221b. The reflective rim in the tube allows for optimal reflection of the ultrasonic waves towards the first and second sensors 221a, 221b.

[0160] In a third embodiment illustrated in [Fig. 10] and [Fig. 11] and named "Opposite", the principle of emission and reception of ultrasonic waves is the same as described in the first and second embodiments. However, in the third embodiment, the first and second sensors 321a, 321b are fixed on opposite surfaces of a measuring tube 130 as illustrated in [Fig. 10] and [Fig. 11].

[0161] In the third embodiment, the measuring tube 130 comprises two tubular segments 330a, 330b which are adapted to house the two sensors 321a, 321b on the side of the measuring tube 130, as described in the second embodiment. However, in the third embodiment, the two tubular segments 330a, 330b are fixed to the two opposite surfaces of the side of the measuring tube 130. The first tubular segment 330a is substantially on the same axis Cl', C2' as the second tubular segment 330b, which is opposite the measuring tube 130.

[0162] The axis Cl, C2' of two tubular segments 330a, 330b is inclined with respect to the water flow axis A'. The angle of said inclination is the same as the angle of inclination of the first and second sensors 321a, 321b with respect to the water flow axis A'. This angle of inclination is between 15 degrees and 75 degrees. In a preferred example, this angle is between 45 and 60 degrees (Figures 10 and 11).

[0163] The ultrasonic waves emitted by the first sensor 321a pass through the measuring tube 130 and are received by the second sensor 321b. In the third embodiment, the ultrasonic waves emitted by the first sensor 321a are substantially on the same axis as the ultrasonic waves emitted by the second sensor 321b.

[0164] The second sensor 321b also emits ultrasonic waves towards the first sensor 321a and the travel time of the ultrasonic waves in the direction of the water flow and in the opposite direction of the water flow is measured.

[0165] The speed sensor 21, 121, 221, 321 can be used together with the temperature sensor 20.

[0166] The temperature sensor 20 can be chosen from the non-limiting list: a thermocouple, a resistance temperature sensor (RTD) or a thermistor (the NTC probe).

[0167] In a non-limiting example, the NTC (negative temperature coefficient) probe, also known as an NTC probe, is used as a temperature sensor 20. In the NTC probe, the resistance decreases with an increase in temperature, so by measuring the resistance of the NTC probe, the temperature of the water flowing in the pipe 9 can be determined.

[0168] One of the advantages of the NTC probe is the precise and reliable water temperature measurement result over a given temperature range, with an accuracy of ± 0.5 °C, for example. The measurement temperature range is between -10°C and 100°C.

[0169] In one embodiment, the NTC probe is coupled to the speed sensor and fixed to the speed sensor. This arrangement allows for a compact configuration.

[0170] The NTC probe can be brought into contact with the water through an orifice formed on the side of the measuring tube 130. Alternatively, the NTC probe can be fixed on the external wall of the measuring tube 130 without direct contact with the water, which allows good water hygiene to be maintained.

[0171] The NTC probe is also easy to install in connection with the speed sensor 21 or directly on the measuring tube 130.

[0172] Figure 12 describes an example of an integrated module with a temperature sensor 20 and a velocity sensor 221. In this example, the first sensor 221a and the second sensor 221b are positioned according to the second embodiment (“Reflect”). The temperature sensor 20 can be isolated from the ambient temperature to increase the accuracy of the water temperature measurements. The temperature sensor 20 is placed in a sleeve 22 fixed to the outer wall of the measuring tube 130. The sleeve 22 containing the temperature sensor 20 can be fixed to the outer wall of the measuring tube 130 by known fastening means.

[0173] The temperature sensor 20 is immobilized in the sleeve 22, which is located between the first and second speed sensors 221a, 221b. This position of the sleeve 22 allows for the stable fixing of the temperature sensor 20 and the easy installation of the temperature sensor 20.

[0174] Finally, the water temperature measurements taken by the temperature sensor 20 can be calibrated based on the material of the measuring tube 130 or based on the resistance dependence of the water temperature within predefined intervals of the water temperature measurement. For temperature calibration, the insulation and / or position of the temperature sensor 20 can also be taken into account. In a non-limiting example, linear calibration is applied for the water temperature measurements.

[0175] In summary, it remains to be noted that the present invention proposes to facilitate the monitoring and operation of the water distribution network 10, by means of sensors 20, 21 connected to a monitoring module 70 capable of tracking the state of the water distribution network, alerting on the state of the network and / or reacting to the state of the network. List of reference numbers

[0176] 1 - a water source

[0177] 2 - a heating appliance

[0178] 3 - an outlet from the water source

[0179] 4 - a waterline

[0180] 4' - a return line

[0181] 5 - a water distribution point

[0182] 6 - a water meter valve

[0183] 7 - a balancing valve

[0184] 9 - a pipe of the network

[0185] 10 - a water distribution network

[0186] 11 - a conduct

[0187] 11'- a return line

[0188] 12 - a temperature regulator

[0189] 13- Circulator

[0190] 20 - a temperature sensor

[0191] 21 - a speed sensor

[0192] 121a, 221a, 321a - a first sensor

[0193] 121b, 221b, 321b - a second sensor

[0194] 22 - a sheath

[0195] 30 - a data acquisition module

[0196] 31 - a case

[0197] 31a - a first hood

[0198] 31b - a second hood

[0199] 32 - a microcontroller

[0200] 33 - a screen

[0201] 34 - a display button

[0202] 40 - a sensor management module

[0203] 50 - a communication module

[0204] 60 - an interface module

[0205] 70 - a network monitoring module

[0206] 80 - a network monitoring system

[0207] 72 - an operating interface

[0208] 122a - a first reflecting mirror

[0209] 122b - a second reflecting mirror

[0210] 123 - screws

[0211] 124-a joint

[0212] 125 - pressing plate

[0213] 130 - measuring tube

[0214] 130a - a measuring tube inlet

[0215] 130b - a measuring tube outlet

[0216] 230a, 330b - the first tubular segment

[0217] 230b, 330b - the second tubular segment

Claims

Demands

1. Water distribution network (10) comprising: at least one water line (4) extending from a water source outlet and serving at least one loop (18) serving a plurality of water distribution points (5) between the water line (4) and a return line (4'), the loop (18) comprising a return pipe (11') downstream of the plurality of water distribution points (5) opening into the return line (4'); at least one balancing valve (7) in the return line (4'); a plurality of sensors (20, 21) provided in the water distribution network (10) for obtaining current values ​​of water parameters, the water parameters comprising at least the water velocity and temperature;and a network monitoring module (70) adapted to receive current water velocity and / or temperature values ​​from the plurality of sensors (20, 21), to compare the received current water velocity and / or temperature values ​​with predetermined parameter values ​​to monitor the state of the water distribution network (10), and to activate at least one of a display mode to produce at least one display with current values ​​and / or network status, an alert mode to produce an alert on current values ​​and / or network status, and a control mode to send control signals to at least one balancing valve (7) based on current values ​​and / or network status.

2. Water distribution network (10) according to claim 1, further comprising several loops (18), wherein each loop (18) comprises a pipe (11) for distributing water to the plurality of water distribution points (5) via a plurality of pipes (9); and a return pipe (11') downstream of the last pipe (9) opening into the return line (4'), with a balancing valve (7) in the return pipe, and wherein at least one of the sensors (20, 21) is placed in the return line (4'), and wherein at least one of the sensors (20, 21) is placed in the water line (4).

3. Water distribution network (10) according to claim 2, wherein additional sensors (20, 21) are provided in the return line (11') and / or adjacent to the balancing valve (7).

4. Water distribution network (10) according to any one of claims 1 to 3, wherein the plurality of sensors (20, 21) is installed in a data acquisition module (30), the data acquisition module (30) comprising a housing (30) with a screen (33) for displaying or signaling the current values ​​of water parameters, in particular with a removable screen.

5. Water distribution network (10) according to any one of the preceding claims, wherein the network monitoring module (70) further comprises an operating interface (72) adapted to receive inputs from a user and output one or more pieces of information or requests to the user, information such as predetermined ranges of water temperature and / or pressure, and requests to the user such as the actuation of at least one balancing valve (7) and / or at least one temperature controller (12).

6. Water distribution network (10) according to any one of the preceding claims, wherein the network monitoring module (70) is configured to generate an alarm signal if the received values ​​are outside a predetermined / preselected range.

7. Water distribution network (10) according to any one of the preceding claims, wherein the network monitoring module (70) is adapted to actuate at least one balancing valve (7) and / or at least one temperature controller (12) if any of the current values ​​of the water parameters is outside a predetermined / preselected range.

8. Water distribution network (10) according to any one of claims 6 or 7, wherein the predetermined / preselected range of one of the actual values ​​of the water parameters is the water velocity and / or the water temperature, in particular the predetermined range of velocity is between 0.1 m / s and 2 m / s and the predetermined range of water temperature is between 20 and 90 degrees, and more particularly between 50 and 80 degrees.

9. Water distribution network (10) according to any one of the preceding claims, wherein the speed sensor (21) is an ultrasonic flowmeter, preferably coupled with a temperature sensor (20).

10. Water distribution network (10) according to claim 9, wherein the speed sensor (21) comprises a first sensor (121a, 221a, 321a) and a second sensor (121b, 221b, 321b) installed on an outer wall of a measuring tube (130), preferably in a first tubular segment (230a) and a second tubular segment (230b) respectively, wherein at least one expression is true: the axis (BT) of the first sensor (121a) and the axis (B2') of the second sensor (121b) are substantially perpendicular to the axis (A') of the measuring tube (130); the axis (BT) of the first sensor (221a) and the axis (B2') of the second sensor (221b) form an angle with the axis of the measuring tube (130) between 15° and 75° or an angle formed by the crossing of the axis (BT) of the first sensor (221a) and the axis (B2') of the second sensor (221b) is between 30° and 150°;the first sensor (321a) and the second sensor (321b) are located substantially on the same axis (Cl', C2') which form an angle with the axis (A') of the measuring tube (130) between 15° and 75°.;

11. Water distribution network (10) according to claim 10, wherein the first sensor (121a, 221a, 321a) and the second sensor (121b, 221b, 321b) are installed on the outer wall of the measuring tube (130) fluidly connected to the water line, the pipeline (9), the conduit (11') or the return line (11') by an ultrasonic gel.

12. A method for operating a water distribution network (10) according to any one of the preceding claims, the method comprising obtaining (S1) current values ​​of water parameters from a plurality of sensors (20, 21) provided in the water distribution network (10), the water parameters comprising at least water velocity and temperature; receiving (S4) by a network monitoring module (70) the current values ​​of water velocity and / or temperature from the plurality of sensors (20, 21); comparing (S5) by the network monitoring module (70) the received current values ​​of water velocity and / or temperature with predetermined parameter values ​​to monitor the state of the network by the water distribution network monitoring module (70); and activate, by the network monitoring module (70), at least one of a display mode to produce at least one display with current values ​​and / or network status, an alert mode to produce an alert on current values ​​and / or network status, and a control mode to send control signals to at least one balancing valve (7) based on current values ​​and / or network status.

13. Method according to claim 12, comprising obtaining (SI) actual values ​​of water parameters by a plurality of sensors (20, 21) in the return line (4') and in the water line (4), and preferably in the return line (11') and / or adjacent to the balancing valve (7).

14. Method according to claim 12, comprising inputting (S7) predefined ranges or thresholds via an operating interface (72) of the network monitoring module (70).

15. A method according to any one of claims 12 to 14, comprising actuating (S8) by the network monitoring module (70) at least one balancing valve (7) and / or at least one temperature controller (12) if any of the current values ​​of the water parameters is outside a predetermined / preselected range.

16. A method according to any one of claims 12 to 15, comprising generating by the network monitoring module (70) an alarm signal if the received values ​​are outside a predetermined / preselected range.

Images