WO2013017938A1 - Installation, device and method for eliminating the waste of water when the cold water faucet is opened - Google Patents

Installation, device and method for eliminating the waste of water when the cold water faucet is opened

Info

Publication number
WO2013017938A1
WO2013017938A1 PCT/IB2012/001478 IB2012001478W WO2013017938A1 WO 2013017938 A1 WO2013017938 A1 WO 2013017938A1 IB 2012001478 W IB2012001478 W IB 2012001478W WO 2013017938 A1 WO2013017938 A1 WO 2013017938A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
water
hot water
control
cold
hot
Prior art date
Application number
PCT/IB2012/001478
Other languages
French (fr)
Portuguese (pt)
Inventor
ALVES Paulo André CORREIA
FARINHA José Manuel TORRES
Original Assignee
Correia Alves Paulo Andre
Torres Farinha Jose Manuel
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00Water main or service pipe systems
    • E03B7/04Domestic or like local pipe systems
    • E03B7/045Domestic or like local pipe systems diverting initially cold water in warm water supply
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/40Water resources protection or enhancement
    • Y02A20/411Water saving techniques at user level

Abstract

The invention relates to a water saving device to be connected to a faucet (6, 7), the main principle being the circulation of water from the hot water pipe (3) to the cold water pipe (10) until the temperature in the hot water pipe (3) reaches a preset temperature.

Description

DESCRIPTION

Installation, device and method for disposal of waste water when you open the cold water lathe

summary

The present invention relates to an installation, a device and a method which allows eliminating water waste when it opens the cold water lathe.

0 electromechanical device corresponds to a device which allows to control the temperature of a fluid, water in its flow point, allowing cold water to remove waste when the user wishes to use hot water.

Technical Field of the Invention

The present electrical / electronics are implemented as components in current use, low- cost technologies may be adopted, in particular electronic components.

The electromechanical component follows a similar approach, both the solenoid valves or the electric pump.

In purely mechanical component may be used commonly used materials such as mounting boxes and similar materials for the final finish.

0 device to adopt this approach and technology, electrical, electronic and mechanical power a final product of low cost, accessible to the majority of the population. 0 device has an electronic control system, items (4) and (8), near the point of flow rate, fed from one or several rechargeable batteries (28) loaded by micro turbines generating electric current (26) (27) or similar power supply voltage lower than 12 V DC, which is guaranteed by the safety conditions for the user.

0 previous principle applies to the control knob (5), whereby the water use zones systems are completely safe for users.

As the movement unit (12) which consists of a water pump (11) and corresponding control (9) is fed from the low voltage mains. This system is outside the working area, so it does not pose safety issues for the user.

In the power system, the battery is complemented by an electric generation system from micro turbines inserted in the pipe, which makes this self-contained device.

The communication between the button (5) and systems (8) and (9) can be carried out through electric wire or wirelessly. This button is the key element that gives start-up operation of the system and may have to be operated in many different ways, such as the following: a watch that gives boot order to the recirculation pump so that, at a certain time the user can avail hot water at the desired points; an IP device (Internet Protocol) which can be operated remotely via the web and / or mobile phone, allowing the user can operate wherever it to.

The device has been designed with variations in order to have full versatility, such as the possibility of being operated without button, as shown in Figure 3.

The device may also be a variant of continuous regulation of the water temperature, as illustrated in Figure 4. In this configuration, the driving device options are the same as those in the preceding paragraphs.

State of the art

As water scarcity a global problem, there are many inventors looking for a formula for your savings, trying to patent the solutions advocated.

Next, some documents are referred to, and are evident to underline here that, despite some points apparent similarity to the invention claimed by us are, in fact, very different devices:

The document CA2252350, US6098213 and US4924536 disclose devices carrying the unused cold water into a reservoir and then can be reused. This device works only on root constructions or in existing but in this case, with deep changes both in the plumbing or in construction, and therefore a very high cost, still implying significant changes particularly in the design of sections in which is installed . Several documents, in particular US7140382 among others, disclose a thermostatic bypass valve placed in the taps, which opens when the desired temperature is reached, allowing water to pass to the tap. It works by pressure differences.

From the view point of saving water, there are devices that resemble the amount of water saved, but have the drawbacks mentioned above.

From the energy point of view, this is the most energy efficient device because, unlike the other devices mentioned, this is the one that only waste energy in heating the water in the piping when it is requested by the user, focusing spending only the extension where the hot water is requested. Accordingly, the present invention is all the more efficient and more versatile, which makes it innovative compared to all others.

Description of the figures

Figure 1 represents the schematic of a typical installation complete sanitary water with hot water and cold water taps taps. These instead of individual valves can be substituted for mixer taps.

This channel already includes a change that comes from the incorporation of the invented device. The new elements as compared to a normal installation, the components are the numbers: (4), (5), (8), (9), (11) and (12). These, as indicated in the figures legend, will allow - only when the button (5) is pressed - water circulation of hot water branch (3) for the cold water branch (10) by the respective taps. They are also marked sense of hot and cold water in the normal operation of the system without water circulation. When it begins circulating water, regardless of the driven system to connect to the pump (11) will force up the water circulating through a closed-loop system corresponding to the extension portion of hot water and cold water, respectively. It is noted in this figure that the new device applied to a conventional plumbing enough energy waste will be eliminated, since, for example, if only it is necessary hot water, the hot water outlet closest to the source, it is not necessary heat the water around the extension of hot water, such as in some types of existing solutions.

Figure 2 represents the device (4) is an individual schedule for a tap to be shown the method of the basic device, which allows the circulation of cold water from the hot water branch (3) for the cold water branch (10 ) until the temperature reaches the hot terminal (6) to the minimum preselected by the user temperature, then 4 minutes at the end of use of hot water circulates in the reverse direction of hot water (18) and thus the energy heat contained in the hot branch is accumulated in the heater with the heat source.

Figure 3 corresponds to the device applied in the tap focusing attention on the mechanism responsible for movement of water in both directions responsible for saving water. In this figure are shown the internal components so that permits building, and wherein each element is identified that is. After being programmed desired temperature in the device via the multifunction buttons (33) when pressing the button (5) that communicates through the antenna (29) with the device (4) indicating the need for hot water in a certain point. The control unit and communication of it (8) sends the information to the control unit and communication of the pump (9) so that it begins its movement and simultaneously causes driving the solenoid valve (17) so as to establish the junction of extension of hot water and cold water. When the temperature sensor (25) detects that the water temperature is the desired temperature informs the control and communication unit (8) and the circuits of the solenoid valve (17) and pump (11) are interrupted. At the end it activates the sound signal circuit or luminous signaling circuit as scheduled. Then if using hot water or cold water passing through this micro turbines (26) and (27) generating electricity to charge the rechargeable battery (28). After 4 minutes at the end of use of hot water circulates in the reverse direction of hot water (18) and thus the thermal energy contained in the hot water branch is accumulated in the heater with the heat source.

Figure 4 is applied to the device in tap focusing attention on the mechanism responsible for regulating the temperature that allows users to make the regulation of the output water temperature (19). Thus allows users to enjoy the equivalent of an effective thermostatic mixer without having to replace their home games taps. That allows, instead of users having to press the button (5) and wait for the signal indicating that the water is at the desired temperature, they may open the tap and the water just go out when the temperature is pre-selected . Thus when the water circulating in the finished recirculation circuit, the valves (21 and 23) are opened and the water leaves the desired temperature.

Figure 5 corresponds to the device applied in the tap but now complete with all the present all device operating mechanisms (4). Thus this figure shows the connections between the components that are responsible for circulating the water (figure 3), and the components responsible for the water temperature control (Figure 4). With this configuration the device (4) has the possibility of eliminating water waste, can take advantage of much of the thermal energy which is the hot water branch (3) when the hot water is used, and still have full control functionality water temperature at each instant, ie the user sets a desired temperature and this remains constant, but the user during use has a possibility to increase and decrease the temperature as desired.

Legend to the figures

1 - Conduct main water supply

2 - Heat source with term accumulator

3 - Extension of hot water

4 - Device applied on tap

5 - activation button

6 - Hot tap water

7 - cold tap water

8 - System control and communication device applied in the tap

9 - control and communication system of the central unit and the water pump 10 - Extension of cold water

11 - Water circulating pump

12 - Central unit and circulation

13 - Normal water direction in hot water extension

14 - reversed direction of water in the cold water station

15 - Normal water direction in cold water extension

16 - Temperature sensor

17 - Solenoid

18 - reversed direction on the water Hot water station

19 - Water outlet

20 - control and communication system of the electrovalve (21)

21 - hot water outlet solenoid control

22 - control and communication system of the electrovalve (23)

23 - solenoid valve of the cold water extension

24 - Mixing chamber

25 - Temperature sensor

26 - Micro Electrical power generating turbine hot water

27 - Micro Electrical power generating turbine cold water

28 - Rechargeable battery

29 - Internal antenna communication

30 - Signaling light

31 - Sound Signaling

32 - Soft keys

33 - Information Display

34 - stent

Detailed Description of the Invention

Description of equipment

main water supply conduit (1): it is connected to the public supply network or any other source of supply. This variable is irrelevant to the proper functioning of the device, but it is advisable to place a basic filter debris to avoid any sand or larger waste that can induce a malfunction or the components of the proposed device or outlet equipment water conduits and belonging to the circuit.

heat source water heater (2): is supplied by the main conduit (1) that will be connected to the hot water branch (3). It is considered heat source any water heating device, which influence the proper functioning of the device - if the heating system is not automatic and / or do not have hot water available, it is impossible to have hot water in the taps the fear accumulator You may have several functions such as storing hot water from solar panels, boilers and also allows the thermal energy that is in the hot water pipe is collected in this order to a use of hot water.

Extension of hot water (3): is supplied by the heat source (2) and which will supply all the devices (4), and all hot water valves (6) whether or not installed on the device.

device applied at the tap (4): is connected to the hot water branch (3), cold water branch (10), hot water tap (6), cold tap water (7) and internally is connected to a control and communication unit (8). This device, when actuated button (5), allows to obtain hot water at the tap (6) without the cold water in the hot water branch (3) is wasted. activation button (5): can be connected either by conductor wire or by a wireless device, or any other drive mechanism allowing the control and communication system (8) and (9). This button is used to inform the system of hot water claim a given terminal of water.

hot water tap (6): is supplied by the device (4); this can possibly be an individual tap or part of the hot water control of a mixer tap. Its function is to regulate the hot water flow which is desired by the user.

Cold tap water (7): is supplied by the device (4); this can possibly be an individual tap or part of the cold water control a mixer tap. The functionality of this is to regulate the cold water flow which is desired by the user.

A control system and internal communication device applied in the tap (8): is responsible for control thereof and for communication between the button (5) and the communication and control system of the pump (9). This is the main control and analysis system, in which is inserted the desired minimum temperature at tap; It has security mechanisms and ensures the proper functioning of the system.

System for monitoring and reporting the water pump (9): this may be connected by wired, wireless or otherwise, their function being to control the pump (11).

Extension of cold water (10) supplied by the main pipe of water supply (1), which will supply all the devices (4) and all the cold water taps (7).

Water circulation pump (11), when requested by the operator by pressing the button (5) is activated by introducing a water circulation movement in both extension in the normal direction (13) of the hot branch (3) and in the opposite direction (14) of the cold water branch (10).

and central movement unit (12): consists of a water pump (11) and corresponding control (9). An alternative to this system is to be replaced by an expander vessel a pressure reducing valve for the cold water branch, and a solenoid various channels. This solution is less applicable on a large scale because of the need for space, but is the one that uses less energy consumption.

normal water movement direction in hot water extension

(13): from the heat source (2) to the device (4) and / or any hot water tap (6).

reversed direction of water movement in extension of cold water

(14): since the means (4) to the main water supply duct (1) in the cold water conduit (10).

normal water movement in the direction of cold water extension

(15): flowing from the main water supply duct (1) to all devices (4) and all the cold water taps (7).

Temperature sensor (16): This component is an interconnect member (8) which is operable to acquire the temperature information of the mixing chamber (24) and inform the control system (8) for the valves (23 and 24) are open in the right proportion to the temperature remains constant.

Solenoid valve (17): responsible for opening and closing the connection between the hot water branch (3) and the extension of cold water (10) being driven by the control member (18) and having the function of allowing the circulation of water only the extension where it is desired hot water.

Water movement reversed direction in hot water branch (18): since the means (4) to the main water supply duct (1) in the hot water conduit (3).

hot water outlet (19): connecting the mixing chamber (24) at the point of use.

Control and communication system of the solenoid valve (21) (20) that is interconnected with the control and communication system of the hot water solenoid valve (22), with the temperature sensor (25) and those depending on the desired temperature by the user, will control the respective solenoid valve so that the water comes out at the desired temperature, both valves (23 and 24) are controlled by the control and communication system (8).

Solenoid hot water control output (21): This valve is responsible for the output control hot water, controlled by its control system (20) - only allows skirt hot water tap when it reaches the user-desired temperature . The continuously adjustable variant allows adjustment of the temperature to secure the desired temperature even if there are changes in various variables in line with the cold water valve extension (23).

Control and communication system of the solenoid valve (23) (22): This is linked with the control and communication system of the hot water solenoid valve (20), with the temperature sensor (25) and those depending on the desired temperature by the user, will control the respective solenoid valve so that the water comes out at the desired temperature, both valves (23 and 24) are controlled by the control and communication system (8).

Solenoid cold water control output (23): this valve is controlled by the control (22) and has double function: to open to pass the water from the hot water branch to the extension of cold water while it does not have the desired temperature and allow adjustment of the temperature to secure the desired temperature even if there are changes in various variables until the desired temperature is reached in line with the cold water valve (20).

mixing chamber (24): this camera has the function of mixing water from the hot water branch (3) with water from the cold water branch (10).

Temperature sensor (25): this component is a constituent part of the mixing chamber (24) which is operable to acquire and notify the control system (20) and (22) of the water temperature so as to allow opening the respective valves (21) and (23) so as to always guarantee the user-desired temperature. Micro hot water turbine (26): has the function to enjoy the movement of water to generate electrical energy that charges the rechargeable battery (29).

Micro cold water turbine (27): has the function to enjoy the movement of water to generate electrical energy that charges the rechargeable battery (29).

Rechargeable battery (28): its function is to store the energy needed to power the entire electrical circuit of the device applied in the tap (4), this is loaded with the micro turbines (26,27).

internal communication antenna (29): has the functionality to communicate with the activation knob (5) and the control and communication system of the pump (9).

light (30): its functionality features indicate good operation of the equipment, availability of hot water and other warnings.

buzzer (31): its functionality indicate errors or malfunctions, availability of hot water and other warnings.

Soft keys (32): these features are select the desired water temperature and other settings.

information display (33): its features indicate the temperature at which the water is, the battery status and other information.

The stent (34) has the functionality to allow changing the distance between the connection to the hot water branch (3) and the cold water branch (10) of the device applied to the tap (4).

Description of the method of operation

1 - Operating Home, the start of the circulation can be done in many ways, the 5 button, which can be included in the device (4), or may be a remote control that communicates with the internal communication antenna (29) of device (4). It can also be activated by a motion sensor which communicates with the internal communication antenna (29) of the device (4) and can be programmed to initiate movement at a certain time of the day or over the web or mobile if the central unit (12) is connected to an internet network.

2 - When the operation is started by the temperature sensor (25) the water temperature is checked on tap where hot water is required. If the temperature is lower than the desired temperature and was pre-programmed into the device (4) using the multifunction buttons (32) then the relevance of the application is checked. The energy used to this step comes from the rechargeable battery (28).

3 - Once after the main pipe of water supply (1) made a division into the hot water branch (3) and cold water (10), wherein both are linked at this point so if another point of the installation is establish another connection between these same two extensions may be said broadly to have a closed circuit. To initiate movement the control and communication system (8) of the device (4) electronically opens the solenoid valve (17) and simultaneously communicates with the control and communication system of the water pump (9) of the central unit and circulation (12) that activates the water circulation pump (11) in reverse cold water (14), the light signal (30) indicates that the process has started and so the water starts to circulate the water of the extension pipe hot (3) for piping the cold water branch (10) and the heat source (2) begins to heat the water until it reaches the device (4).

When the temperature measured by the temperature sensor (25) is equal to the preset temperature, once the control and communication system (8) of the device (4) communicates via the internal communication antenna (29) to communicate with the system monitoring and reporting the water pump (9) of the central unit and of circulation (12) which stops the pump (11) and then immediately the solenoid valve (17) is closed again and the water is ready to be used, and is informed by an audible signal (31) and / or light (30) is hot water also in the information indicating display (33) water may be used.

After the hot water being at the point of use, starts a time counter in the predetermined control and communication system (8). If water is not used is again verified by the absence of movement of the microturbine (26), is opened electronically solenoid (17) and simultaneously communicates with the control and communication system of the water pump (9) of the central unit and circulation (12) that activates the water circulation pump (11) but this now circulates in the normal direction of the extension of cold water (15) now making circulate water from the cold water branch piping (10) to the tubing of extension of hot water (3) in the reverse direction of hot water (18) passing the hot water from the pipe by the water heater set at (2) in this way the hot water is not used it is possible to take advantage of the thermal energy contained in the water extension hot (3) and if necessary again hot water is necessary to re-start the process.

At this point the water will already be hot and ready to be used, depending on the desired temperature and the desired flow rate solenoid valves (21) and (23) of hot and cold water respectively, which are controlled by their control and communication units (20 and 22). The respective valves will vary the flow and thus the mixing is done in the mixing chamber (24). If some variable is changed by the installation to influence the temperature change solenoid valves

(21) and (23) of hot and cold water respectively, will vary instant so that the desired temperature in the mixing chamber is obtained instantaneously thus guarantees a constant temperature water outlet (19). The micro-turbines generating respective electrical (26, 27) carry the battery pack (28) and the feed device. In the information display (33) can be pressed various information such as the liters of water saved by the liters consumed dare use the analysis of micro-turbines (26 and 27), the water temperature through the temperature sensor

(16) and it is also possible to choose the desired temperature and the desired flow rate can thus replace the functionality of a normal tap. When the use of hot water is finished repeats step 5, and if used several times the same tap whenever ending a usage counter 4 minutes has elapsed resets, as the microturbine (26) does not circulate in this interval time indicates that the hot water was not used, so as to check that water is not used for the period of 4 minutes is opened electronically solenoid (17) and the pump (11) but is now circulated in the normal direction of the extension of cold water (15) making now circulate water from the cold water branch piping (10) for the extension of the hot water pipe (3) in the reverse direction of hot water (18) by passing hot water through the water heater so that the its thermal energy to be harnessed.

When the temperature of the water circulating pump is up to 10 degrees below the central unit of the storage temperature (12) switches off the pump while communicating with the unit (4) for the solenoid (17) is also closed. -07-2012

Claims

Installation for eliminating water waste when it is open the hot water faucet equipped with a duct water supply (1), heat source water heater (2), extension hot water (3), hot water tap (6) , cold water tap (7), cold water branch (10), characterized in that it comprises: apparatus for removing the waste water (4); activation button (5) of the starter circuit; central unit and movement (12) formed by the water circulation pump (11) and the control and communication system (9).
Device for elimination of waste water when it is open hot water tap, characterized in that it comprises: control and communication system (8) with the central unit and of circulation (12); temperature sensors (16) and (25); solenoid valve (17) connecting between the hot water branch (3) and the cold water branch (10); water outlet (19); Control and communication system (20) of the hot water supply control valve (21); hot water solenoid valve control output (21); Control and communication system (22) of the cold water outlet control valve (23); the cold water valve extension (23); mixing chamber (24); micro-electrical power generating turbine hot water (26) charging the battery (28) when the user is using hot water; generating micro-turbine power supply of cold water (27) for charging the rechargeable battery (28) when the user is using cold water; rechargeable battery (28); internal communication antenna (29); light (30); buzzer (31); Multifunction buttons (32); information display (33); The stent (34) for adjusting the wheelbase of the hot water faucet (6) and cold (7);
Device for elimination of waste water when it is open hot water tap according to Claim 2, characterized in that the valve (17) is driven by continuous chain with a voltage lower than 12 V.
Device for elimination of waste water opens when the hot water tap according to Claim 2, characterized in that the multifunction buttons (32) can be digital or analog.
Device for eliminating water waste when it is open hot water tap according to paragraph 2 claim wherein the rechargeable battery (28) is loaded by generating micro-turbine power supply of hot water (26) and generating micro-turbine power supply of cold water (27).
Device for eliminating water waste when it is open hot water tap according to Claim 2, characterized in that the distance between the connection to the hot water branch (3) and the extension of cold water (10) is alterable through the stent (34).
Device for elimination of waste water when it is open hot water tap according to Claim 2 characterized in that the detection of non-use hot water to be effected by the lack of
Second motion generating micro-turbine electric current of warm water (26).
Device for eliminating water waste when it is open hot water tap according to paragraph 2 claim wherein the informational display (33) showing different information, namely the selected temperature liters of water consumed and saved, or any other considered pertinent information.
Method for the elimination of waste of water when it is open hot water tap, characterized in that it comprises the following steps: a) the circuit is activated by the activation knob (5) Circuit initiation or when the previously set time one of the buttons multifunction (32) is reached, or by a remote instruction received wirelessly or through a motion sensor;
b) the water circulation starts with the control and communication system (8) of the device (4) sending an opening instruction to the solenoid valve (17) and an instruction to the control and communication system water pump (9) of the central unit and of circulation (12), activating the water circulation pump (11), a luminous warning being emitted by light (30);
c) while the water does not reach the pre-set temperature of the multifunction buttons (32) and measured by the temperature sensor (25), the water will remain to circulate the hot water branch (3) for water station cold (10) in reverse cold water (14)
3 causing the check cold water being heated while passing through the heat source (2);
d) when the water reaches the preset temperature, the control and communication system (8) of the device (4) communicates via the internal communication antenna (29) with the control and communication system of the water pump (9) the central unit and of circulation (12) to turn off the water circulation pump (11) and the solenoid valve (17) closed, a luminous warning is issued by the warning light (30), a beep is emitted by buzzer (31) and a message on the information display (33) reports that the water has reached the predetermined temperature;
e) during a predetermined time interval and counted in the control and communication system (8) the hot water is not used, the solenoid valve (17) is opened, the control and communication system of the water pump (9) and central movement unit (12) activates the water circulation pump (11) circulating in the normal sense of this cold water (15), maintaining the water circulating cold water branch (10) to the extension of hot water (3) in the reverse direction of hot water (18), causing the thermal energy existing in hot water circuit is utilized when the circuit is restarted;
f) having the water reached the desired temperature and the desired flow rate, the solenoid valve of the hot water outlet control (21) controlled by the control and communication system (20), the solenoid cold water control output (23) controlled the control and communication system (22) will by varying the flow rates so that the hot and cold water mixing effected in the mixing chamber (24) to hold
4 constant temperature controlled by the temperature sensor (16);
when the difference in temperature of the water circulating in the water circulation pump (11) and the selected temperature is equal to a predetermined value, the central unit and of circulation (12) turns off the water circulation pump (11), communicating at the same time that the solenoid valve (17) is closed. -07-2012
5
PCT/IB2012/001478 2011-07-29 2012-07-20 Installation, device and method for eliminating the waste of water when the cold water faucet is opened WO2013017938A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PT10584311 2011-07-29
PT105843 2011-07-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20120769703 EP2792801A1 (en) 2011-07-29 2012-07-20 Installation, device and method for eliminating the waste of water when the cold water faucet is opened

Publications (1)

Publication Number Publication Date
WO2013017938A1 true true WO2013017938A1 (en) 2013-02-07

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US7140382B2 (en) 2000-10-25 2006-11-28 Grundfos Pumps Corporation Water circulating system having thermostatically controlled bypass valve
US20100126604A1 (en) * 2008-11-18 2010-05-27 Lund William J System and Method for On Demand Hot Water Distribution
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Publication number Priority date Publication date Assignee Title
DE3723089A1 (en) * 1987-07-13 1989-01-26 Stiebel Eltron Gmbh & Co Kg Service-water tapping arrangement
US4924536A (en) 1989-06-05 1990-05-15 Houghton Connie H System of conserving water in a building
US5042524A (en) * 1989-09-29 1991-08-27 Metlund Enterprises Demand recovery hot water system
US5351712A (en) * 1993-11-23 1994-10-04 Houlihan John A Hot water recovery system
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US6098213A (en) 1999-04-16 2000-08-08 Hen-Tsung Chen Water temperature regulator
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