JP2013015234A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply system capable of raising the temperature of water in a water supply piping system even when supplying hot water not only to a bathroom when taking a bath but also to places other than the bathroom, and suppressing the energy consumption in a water heater.SOLUTION: A control device of a water supply system maintains the closed state of an on-off valve for opening/closing a water discharge system connected to a lower part of a bath tub in a bathroom when a bathing information acquisition device for acquiring information on the bathing determines that someone is taking a bath on the basis of the acquired information. On the other hand, when the bathing information acquisition device determines that no one is taking a bath on the basis of the acquired information, and further determines that hot water is distributed on a path connected to other part than the bathroom on the basis of the detection result of the hot water supply detection device for detecting presence/absence of distribution of hot water in the path connected to places other than the bathroom, the on-off valve is set in an open state.

Description

  The present invention relates to a hot water supply system that supplies hot water to a plurality of locations such as a bathroom and a kitchen.

  Conventionally, as a hot water supply system for supplying hot water to a plurality of places such as a bathroom or kitchen, a water heater that heats water from a water supply source such as a water supply to make hot water, and a hot water supply piping system connected to the water heater And a water supply piping system connected to a water supply source, a hot water supply piping system and a mixing valve connected to the water supply piping system, and hot water from the hot water supply piping system is mixed with water from the water supply piping system by the mixing valve. That are configured to make hot water at the right temperature.

  And this kind of hot water supply system, when the temperature of the water of the water supply source is low, the consumption of energy for heating the water is increased and the consumption of hot water (heated water) is increased. There is provided a system in which the temperature of water in a water supply piping system is increased by the heat of used hot water flowing through a path, and the water is mixed with hot water in a hot water supply piping system.

  That is, in this type of hot water supply system, there is an exhaust heat recovery device that recovers the heat of used hot water (hot water from a shower or currant) that circulates in a drainage channel connected to a bathroom drainage outlet in the middle of the water supply piping system. What is provided is provided (for example, refer patent document 1).

  Such a hot water supply system heats the water in the water supply piping system by exchanging heat between the used hot water flowing through the drainage channel and the water flowing through the exhaust heat recovery device (water supply piping system). ing. As a result, the hot water supply system having the above-described configuration can increase the temperature of the water in the water supply piping system and then mix the water with the hot water in the hot water supply piping system. It is not necessary to heat or supply a large amount of hot water from the water heater, and it is said that consumption of energy in the water heater can be suppressed.

Utility Model Registration No. 3149968

  By the way, the hot water supply system recovers the heat of the hot water flowing through the drainage channel connected to the drainage port of the bathroom with the exhaust heat recovery device provided in the middle of the water supply piping system. When water is not discharged into the drainage channel (except when bathing), heat recovery (heat exchange between water and used hot water) cannot be performed by the exhaust heat recovery device.

  For this reason, the hot water supply system having the above configuration is to mix the low-temperature water from the water supply source with the hot water from the water heater when using hot water in places other than the bathroom (for example, kitchen or washroom). Thus, the amount of energy consumed when heating the water in the water heater increases, and the amount of hot water (heated water) heated to a high temperature in the water heater increases.

  Then, as with heat recovery for used hot water in the bathroom, it may be possible to recover heat for used hot water from places other than the bathroom, but the amount of hot water used in places other than the bathroom is Is much less than the amount of hot water used (the amount of hot water discharged from showers and currants), so the amount of energy that can be saved is small compared to the complexity of the system, which is not realistic.

  Therefore, the present invention can increase the temperature of the water in the water supply piping system not only when supplying hot water to the bathroom during bathing, but also when supplying hot water to places other than the bathroom, and consumes energy in the water heater. It is an object to provide a hot water supply system that can suppress heat.

  A hot water supply system according to the present invention includes a water heater that heats water from a water supply source to make hot water, a hot water supply piping system connected to the water heater, and a water supply piping system connected to the water supply source. , Equipped with a mixing valve that connects the hot water supply piping system and the water supply piping system, and a piping system that connects the plurality of locations including the bathroom and the mixing valve, and circulates a drainage channel connected to the drain outlet of the bathroom in the middle of the water supply piping system Exhaust heat recovery device that recovers the heat of used hot water is installed, and hot water from the hot water supply piping system is mixed with water from the hot water supply piping system with a mixing valve to make the hot water at multiple locations including the bathroom In a hot water supply system configured to be capable of hot water supply, a hot water detection device for detecting the presence or absence of hot water distribution on a route connected to a place other than the bathroom in the piping system, and a bathing information acquisition device for acquiring information related to bathing And a drainage system connected to the bottom of the bathtub in the bathroom An open / close valve that closes and a control device that opens and closes the open / close valve based on the detection results of the hot water supply detection device and the bathing information acquisition device, and the drainage system recovers exhaust heat from the hot water stored in the bathtub When the controller determines that it is bathing based on the information acquired by the bathing information acquisition device, the control device maintains the open / close valve in the closed state, while the bathing information acquisition device acquires it. Based on the information, the on-off valve is opened when it is judged that there is no bathing and it is judged that there is hot water circulation on the route leading to a place other than the bathroom based on the detection result of the hot water detection device. To do.

  Here, “information related to bathing” means information obtained by the action of the bather in the bathroom or information obtained by the bather's intention to take a bath, for example, Information on the presence or absence of people in the bathroom, information on the presence or absence of hot water accompanying bathing (use or non-use of hot water), information on the presence or absence of drainage from the bathroom drain, information on the bathing time set by the user, etc. This means information on the presence or absence of switch operations such as bathroom lights and ventilation fans.

  When the control device of the hot water supply system determines that the bathing information is acquired based on the information acquired by the bathing information acquisition device, the on / off valve is maintained in a closed state, while the bathing information acquisition device is performing the bathing based on the information acquired. If it is determined that there is no hot water on the route that leads to a location other than the bathroom based on the detection result of the hot water detection device, the on-off valve is opened to open the bath (there is a bather in the bathroom) The hot water stored in the tub is drained when the hot water is stored in the bathtub while the bath is not bathing (no bathers in the bathroom) To be discharged.

  And in the hot water supply system of the said structure, since the waste_water | drain system connected to the lower part of the bathtub in a bathroom is comprised so that the warm water stored in the bathtub can be discharged | emitted to the upstream of the waste heat recovery apparatus in a drainage channel. As described above, the hot water discharged from the bathtub to the discharge channel flows toward the downstream side of the drain channel, and exchanges heat with the water in the exhaust heat recovery device. That is, there is a large amount of hot water stored in the bathtub, and the heat energy is stored for a relatively long time due to the heat retention effect of the bathtub and the additional cooking, so when flowing through the drainage channel The water flowing through the water supply piping system (exhaust heat recovery device) is heated.

  In addition, as described above, the hot water supply system having the above-described configuration maintains the open / close valve in a closed state when it is determined that the control device is bathing, so that hot water in the bathtub is not discharged into the drainage channel. Since warm water from the shower and currant flows into the drainage channel from the drain outlet, the warm water (warm drainage) heats water from the water supply source that circulates the exhaust heat recovery device (water supply piping system).

  Therefore, the above hot water supply system is more than necessary in the water heater when hot water is supplied to the bathroom during bathing (when using hot water in a shower or currant) or when hot water is supplied to a place other than the bathroom without bathers. It is not necessary to heat the water to supply a large amount of hot water, and energy consumption in the water heater can be suppressed.

  As one aspect of the present invention, the bathing information acquisition device is configured by a detection sensor that detects the presence or absence of hot water distribution on a path that leads to a bathroom in the piping system, and the control device is based on the detection result of the detection sensor. When it is determined that there is a hot water distribution on the route that leads to the bathroom, it is determined that the bathing is in progress, and based on the detection result of the detection sensor, it is determined that there is no hot water distribution on the route that leads to the bathroom. It may be configured to determine that it is not bathing. Since the bather uses hot water while taking a bath, it is possible to determine whether or not the user is taking a bath based on the presence or absence of hot water on a route connected to the bathroom (a route connected to a shower or currant in the bathroom).

  Accordingly, if the hot water supply system having the above configuration determines that there is hot water circulation on the path leading to the bathroom based on the detection result of the detection sensor, the hot water supply system is assumed to be bathing for a predetermined time (for example, ) During the bathing time, the hot water in the bathtub is prevented from being discharged, and the control device determines that there is no hot water distribution on the path leading to the bathroom based on the detection result of the detection sensor. If it is judged that there is hot water circulation on the route that leads to a place other than the bathroom based on the detection result, it is assumed that there is no bather in the bathroom (not bathing) and hot water is supplied to a place other than the bathroom. Then, the on-off valve is opened and the hot water in the bathtub is discharged to the drainage channel.

  Therefore, the above hot water supply system is more than necessary in the water heater when hot water is supplied to the bathroom during bathing (when using hot water in a shower or currant) or when hot water is supplied to a place other than the bathroom without bathers. It is not necessary to heat the water to supply a large amount of hot water, and energy consumption in the water heater can be suppressed.

  As another aspect of the present invention, the bathing information acquisition device is configured with a timer capable of measuring a time and setting a predetermined time zone, and the control device is a predetermined time zone based on a measurement result of the timer. It may be configured to determine that the user is taking a bath when the determination is made, and to determine that the user is not taking a bath when the time is determined to be a time zone other than the predetermined time zone based on the measurement result of the timer. In general households, bathing is often performed at a roughly fixed time zone at night, so it can be estimated that a predetermined time zone is being bathed.

  Accordingly, when the control device determines that the predetermined time zone is based on the measurement result of the timer, the hot water supply system having the above-described configuration assumes that bathing is in progress and takes a bath for a predetermined time (for example, during the bathing time). The hot water inside is prevented from being discharged, and the control device determines that it is a time zone other than the predetermined time zone based on the measurement result of the timer, and at a place other than the bathroom based on the detection result of the hot water detection device If it is judged that there is hot water circulation on the connected route, the bath is opened with the open / close valve open, assuming that there is no bather in the bathroom (not bathing) and that the hot water is supplied to a place other than the bathroom. Of hot water to the drain.

  Therefore, the above hot water supply system is more than necessary in the water heater when hot water is supplied to the bathroom during bathing (when using hot water in a shower or currant) or when hot water is supplied to a place other than the bathroom without bathers. It is not necessary to heat the water to supply a large amount of hot water, and energy consumption in the water heater can be suppressed.

  As another aspect of the present invention, the bathing information acquisition device is configured by a human detection sensor that detects the presence or absence of a person in the bathroom, and the control device has a person in the bathroom based on the detection result of the human detection sensor. It may be configured to determine that the user is taking a bath when the determination is made, and to determine that the user is not taking a bath when it is determined that there is no person in the bathroom based on the detection result of the human detection sensor.

  In the hot water supply system configured as described above, if the control device determines that there is a person in the bathroom based on the detection result of the human detection sensor, the hot water in the bathtub is discharged as if it is bathing (bath time). And the control device determines that there is no person in the bathroom based on the detection result of the human detection sensor, and there is circulation of hot water on a route that leads to a place other than the bathroom based on the detection result of the first detection device. If it is judged that the bather is not in the bathroom (not bathing), the hot water in the bathtub is discharged to the drainage channel by opening the on-off valve, assuming that the hot water is supplied to a place other than the bathroom.

  Therefore, the above hot water supply system is more than necessary in the water heater when hot water is supplied to the bathroom during bathing (when using hot water in a shower or currant) or when hot water is supplied to a place other than the bathroom without bathers. It is not necessary to heat the water to supply a large amount of hot water, and energy consumption in the water heater can be suppressed.

  As described above, the hot water supply system according to the present invention can increase the temperature of water in the water supply piping system not only when supplying hot water to the bathroom during bathing but also when supplying hot water to places other than the bathroom. It is possible to achieve an excellent effect that energy consumption in the boiler can be suppressed.

FIG. 1 shows a schematic system diagram of a hot water supply system according to an embodiment of the present invention. FIG. 2 is an overall perspective view of the exhaust heat recovery apparatus according to the embodiment. FIG. 3 is a perspective view of a first heat recovery body and a second heat recovery body constituting the exhaust heat recovery apparatus according to the embodiment, wherein (a) shows a perspective view of the first heat recovery body, (B) shows the perspective view of a 2nd heat recovery body. FIG. 4 is a schematic cross-sectional view of the exhaust heat recovery apparatus (first heat recovery body and second heat recovery body) according to the embodiment, wherein (a) shows the flow of water in the first heat recovery body. The cross-sectional view containing is shown, (b) shows the cross-sectional view containing the flow of the water of a 2nd heat recovery body. FIG. 5: is a schematic longitudinal cross-sectional view of the waste heat recovery apparatus which concerns on the same embodiment, Comprising: The longitudinal cross-sectional view of the state installed in the drainage channel is shown. FIG. 6 shows a schematic system diagram of a hot water supply system according to another embodiment of the present invention. FIG. 7 shows a schematic system diagram of a hot water supply system according to another embodiment of the present invention. FIG. 8 shows an overall perspective view of an exhaust heat recovery device of a hot water supply system according to still another embodiment of the present invention. 9 is a cross-sectional view of the state where the exhaust heat recovery apparatus shown in FIG. 8 is installed in the drainage channel, where (a) shows a cross-sectional view and (b) shows a longitudinal cross-sectional view.

  Hereinafter, a hot water supply system according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the hot water supply system according to the present embodiment is premised on the installation of a bathroom BR provided with a bathtub BT, and heats water from a water supply source such as waterworks to make hot water. A water heater 2, a hot water supply piping system 3 connected to the water heater 2, a water supply piping system 4 connected to a water supply source, a mixing valve 5 connecting the hot water supply piping system 3 and the water supply piping system 4, A piping system 6 that connects a plurality of locations including the bathroom BR and the mixing valve 5 is provided.

  The water heater 2 is connected to a pipe connected to a water supply source so that water at room temperature is supplied. In the schematic system diagram shown in FIG. 1, the pipe branched from the water supply pipe system 4 is connected to the water heater 2. And the water heater 2 heats the supplied water to make hot water. That is, as the water heater 2, a continuous type that continuously heats the water supplied from the water supply source or a hot water storage type that stores and heats the water supplied from the water supply source is adopted. The

  The water heater 2 mixes heated water (hot water) when the stop cock (not numbered) installed in the bathroom BR, kitchen, washroom, etc. is opened. It is comprised so that it may send out sequentially toward.

  The water supply piping system 4 fluidly connects a water supply source and a mixing valve 5. The water supply piping system 4 is provided with an exhaust heat recovery device 42 that recovers the heat of the used hot water flowing through the drainage channel DR connected to the drainage port D of the bathroom BR at an intermediate position. That is, the water supply piping system 4 is interposed between a primary side water supply pipe 40 connected to a water supply source, a secondary side water supply pipe 41 connected to the mixing valve 5, and a primary side water supply pipe 40 and a secondary side water supply pipe 41. And an exhaust heat recovery device 42 installed in the drainage channel DR connected to the drainage port D of the bathroom BR.

  And the top of the area where the exhaust heat recovery device 42 in the drainage channel DR is installed is composed of a detachable lid C, and the exhaust heat recovery installed in the drainage channel DR by removing the lid C. The device 42 can be accessed. In FIG. 1, the entire drainage channel DR including the lid C is disposed below the bathtub BT. However, in reality, at least the exhaust heat recovery device 42 in the drainage channel DR is installed (including the lid C). The region) is arranged at a position shifted laterally with respect to the bathtub BT (a position without the bathtub BT above), and the lid C can be attached and detached from above.

  As shown in FIG. 2, the exhaust heat recovery device 42 according to the present embodiment includes a first heat recovery body 43 configured to be able to circulate water from a water supply source, and similarly to the first heat recovery body 43. And a second heat recovery body 44 configured to be able to circulate water from the water source.

  As shown in FIG. 2 and FIG. 3A, the first heat recovery body 43 includes a plurality of first heat transfer cassettes 430 arranged at predetermined intervals and adjacent first heat transfer cassettes 430. It has the connection parts 431a and 431b which connect each other. Each of the first heat transfer cassettes 430 is formed by liquid-tightly sealing the outer periphery of a pair of heat transfer plates P and P that form a superposed quadrangular shape, and between the heat transfer plates P and P ( An internal flow path 430a (see FIGS. 4A and 5) through which water flows is formed inside. The plurality of first heat transfer cassettes 430 are arranged in an upright state. That is, each 1st heat transfer cassette 430 ... is arrange | positioned so that two opposite sides of the four sides which comprise the outline of the heat transfer plates P and P may be extended in an up-down direction, and the adjacent 1st heat transfer cassette of the other party is adjoined. 430... (Heat transfer plates P, P) face-to-face.

  As shown in FIG. 4A, the connecting portions 431a and 431b are formed in a cylindrical shape, and both the first heat transfer cassettes 430 are interposed between the adjacent first heat transfer cassettes 430. , 430, the internal flow paths 430a and 430a communicate with each other.

  In the first heat recovery body 43, the connecting portions 431a and 431b are arranged so that the flow direction of the water in the internal flow path 430a of the first heat transfer cassette 430 is switched for each first heat transfer cassette 430. Has been. More specifically, the first heat recovery body 43 according to the present embodiment includes a first connection portion 431a that connects one ends of the first heat transfer cassettes 430 in the width direction, and the first heat transfer cassettes 430. 2nd connection part 431b which connects the other ends of the width direction, The said 1st connection part 431a and the 2nd connection part 431b are alternately arrange | positioned by the parallel direction of 1st heat-transfer cassette 430 ..., and are adjacent. Matching first heat transfer cassettes 430 are connected to each other.

  The connection parts 431a and 431b (the first connection part 431a and the second connection part 431b) of the first heat recovery body 43 according to this embodiment are the first heat transfer cassette 430 as shown in FIGS. The upper ends of ... are connected to each other. That is, the 1st connection part 431a connects the upper end parts of the one end side of the width direction of adjacent 1st heat transfer cassette 430 ..., and the 2nd connection part 431b is the width | variety of adjacent 1st heat transfer cassette 430 .... The upper ends on the other end side in the direction are connected to each other. Thereby, as shown to Fig.4 (a), the 1st heat recovery body 43 has the 1st heat-transfer cassette 430 ... from which the flow direction of water turns to the other end side from the one end side of the width direction, and the flow direction of water. The first heat transfer cassettes 430... Facing alternately from the other end side in the width direction are arranged alternately.

  Of the plurality of first heat transfer cassettes 430, the first heat transfer cassette 430 at one end in the parallel direction is connected to the primary side water supply pipe 40 and the first heat transfer cassette 430 at the other end in the parallel direction. Is connected to the secondary water supply pipe 41. Thereby, the 1st heat recovery body 43 is each 1st heat transfer cassette from the 1st heat transfer cassette 430 ... in the one end side of a parallel direction toward the 1st heat transfer cassette 430 ... in the other end side of a parallel direction. Water can be circulated while changing the flow direction in the internal flow path 430a of 430.

  As shown in FIGS. 2 and 3B, the second heat recovery body 44 includes a plurality of second heat transfer cassettes 440 arranged at predetermined intervals, and adjacent second heat transfer cassettes 440. It has connection parts 441a and 441b which connect each other. Each of the second heat transfer cassettes 440 is formed by sealing the outer circumferences of a pair of heat transfer plates P, P having a superposed quadrangular shape between the heat transfer plates P, P ( An internal flow path 440a (see FIGS. 4B and 5) through which water flows is formed inside. The plurality of second heat transfer cassettes 440... Are arranged in an upright state. That is, each 2nd heat transfer cassette 440 ... is arrange | positioned so that two opposing sides of the four sides which comprise the outline of the heat transfer plates P and P may extend in an up-down direction, and the adjacent 2nd heat transfer cassette of the other party is adjoined. 440... (Heat transfer plates P, P) face-to-face.

  The connecting portions 441a and 441b are formed in a cylindrical shape as shown in FIG. 4B, and both the second heat transfer cassettes 440 are interposed between the adjacent second heat transfer cassettes 440. , 440, the internal flow paths 440a and 440a communicate with each other.

  And the connection part 441a, 441b is arrange | positioned so that this 2nd heat recovery body 44 may change the direction of the distribution | circulation of the water in the flow path of a heat transfer cassette for every 2nd heat transfer cassette 440 .... More specifically, the second heat recovery body 44 according to the present embodiment includes a third connection portion 441a that connects one ends of the second heat transfer cassettes 440 in the width direction and the second heat transfer cassettes 440. 4th connection part 441b which connects the other ends of the width direction, The said 3rd connection part 441a and the 4th connection part 441b are alternately arrange | positioned by the parallel direction of the 2nd heat transfer cassette 440 ..., and are adjacent. Matching second heat transfer cassettes 440 are connected to each other.

  As shown in FIGS. 2 and 3B, the connecting portions 441a and 441b (the third connecting portion 441a and the fourth connecting portion 441b) of the second heat recovery body 44 according to this embodiment are connected to the second heat transfer cassette 440. The lower ends of ... are connected to each other. That is, the 3rd connection part 441a connects the lower end parts of the one end side of the width direction of adjacent 2nd heat transfer cassette 440 ..., and the 4th connection part 441b is the width | variety of adjacent 2nd heat transfer cassette 440 .... The lower end portions on the other end side in the direction are connected to each other. Thereby, as shown in FIG.4 (b), the 2nd heat recovery body 44 has the 2nd heat-transfer cassette 440 ... from which the flow direction of water turns to the other end side from the one end side of the width direction, and the flow direction of water. The second heat transfer cassettes 440... Facing alternately from the other end side in the width direction are arranged alternately.

  Of the plurality of second heat transfer cassettes 440..., The second heat transfer cassette 440 at one end in the parallel direction is connected to the primary water supply pipe 40 and the second heat transfer cassette 440 at the other end in the parallel direction. Is connected to the secondary water supply pipe 41. As a result, the second heat recovery body 44 moves from the second heat transfer cassette 440 at one end in the parallel direction toward the second heat transfer cassette 440 at the other end in the parallel direction. Water can be circulated while changing the flow direction in the internal flow path 440a of 440. Each of the primary side water supply pipe 40 and the secondary side water supply pipe 41 according to the present embodiment is bifurcated in the vicinity of the exhaust heat recovery device 42, and the first heat recovery body 43 (first heat transfer cassette). 430) and the second heat recovery body 44 (second heat transfer cassette 440).

  As shown in FIGS. 2 and 5, the exhaust heat recovery device 42 according to the present embodiment is disposed in the drainage channel DR such that the first heat transfer cassettes 430 are interposed between the second heat transfer cassettes 440. The first heat recovery body 43 is superimposed on the installed second heat recovery body 44. Accordingly, in the exhaust heat recovery apparatus 42 according to the present embodiment, a gap (flow path) through which waste water can flow is formed between the first heat transfer cassettes 430... And the second heat transfer cassettes 440.

  Further, in the exhaust heat recovery apparatus 42 according to the present embodiment, the lower ends of the second heat transfer cassettes 440 are connected by the connecting portions 441a and 441b, while the upper ends of the first heat transfer cassettes 430 are connected. Since it is connected by 441a and 441b, the 1st heat recovery body 43 and the 2nd heat recovery body 44 are arranged in the state shifted in the up-and-down direction. That is, in the exhaust heat recovery apparatus 42 according to the present embodiment, the second heat transfer cassettes 440... Are mounted on the bottom of the drainage channel DR, while the first heat transfer cassettes 430. It is arrange | positioned in the state spaced apart to the side.

  As a result, the exhaust heat recovery device 42 according to the present embodiment (the first heat transfer cassette 430 of the first heat recovery body 43 and the second heat transfer cassette 440 of the second heat recovery body 44) of the drainage channel DR. A flow path meandering in the vertical direction from the upstream side toward the downstream side is formed. Thereby, the hot water supply system 1 which concerns on this embodiment distribute | circulates the internal flow path 440a of the warm waste_water | drain which flows in the drainage channel DR, and the waste heat recovery apparatus 42 (the 1st heat recovery body 43 and the 2nd heat recovery body 44). Heat can be exchanged with water to increase the temperature of the water.

  Since the exhaust heat recovery device 42 according to this embodiment is formed by combining the first heat recovery body 43 from the upper side with respect to the second heat recovery body 44 as described above, the first heat recovery body 42 is formed. The body 43 can be pulled up and separated from the second heat recovery body 44. Thus, the exhaust heat recovery device 42 separates the first heat recovery body 43 (first heat transfer cassette 430...) And the second heat recovery body 44 (second heat transfer cassette 440. Since the second heat transfer cassette 440 ... does not exist between the heat transfer cassettes 430 ... and the first heat transfer cassette 430 ... does not exist between the second heat transfer cassettes 440 ..., between the first heat transfer cassettes 430 ... It becomes easy to insert a cleaning tool (brush) between the second heat transfer cassettes 440.

  Therefore, when the soaps and oils contained in the warm drainage adhere to the first heat recovery body 43 (first heat transfer cassette 430...) And the second heat recovery body 44 (second heat transfer cassette 440...) As scales. Cleaning can be performed easily.

  Returning to FIG. 1, the hot water supply piping system 3 according to the present embodiment is a piping in which a water heater 2 and a mixing valve 5 are connected. The mixing valve 5 is a so-called three-way valve.

  And the hot water supply system 1 which concerns on this embodiment detects the presence or absence of the distribution | circulation of the hot water on the path | route (2nd piping mentioned later) 62 connected to locations (kitchen and washroom) other than bathroom BR in the said piping system 6. Hot water detection device 7, bathing information acquisition device 8 for acquiring information related to bathing, on-off valve 9 for opening and closing drainage system DP connected to the lower part of bathtub BT in bathroom BR, hot water detection device 7 and bathing And a control device 10 that opens and closes the on-off valve 9 based on the detection result of the information acquisition device 8.

  As described above, the piping system 6 according to the present embodiment is configured to be capable of supplying hot water to a plurality of locations including the bathroom BR. That is, the piping system 6 includes a main pipe 60 connected to the mixing valve 5, a branch joint (not numbered) connected to the main pipe 60, a first pipe 61 connecting the branch joint and the bathroom BR, And a second pipe 62 that connects the branch joint and a place other than the bathroom BR. In addition, the 2nd piping 62 is branched on the way, and is connected with the kitchen, the washroom, etc.

  The hot water supply detection device 7 according to the present embodiment is composed of a flow rate sensor and is provided on the second pipe 62. Accordingly, the hot water supply detection device 7 (flow rate sensor) can detect the presence or absence of hot water distribution on the second pipe 62 (path) when hot water is supplied to places other than the bathroom BR.

  The bathing information acquisition device 8 according to the present embodiment is composed of a flow switch that outputs an ON signal as the fluid flows, and is provided on the first pipe 61. Thereby, bathing information acquisition device 8 (flow switch) detects the presence or absence of the circulation of hot water on first piping 61 (path) when supplying hot water to bathroom BR, and issues an ON signal in a state where the circulation of hot water is present. It is like that.

  The drainage system DP is configured such that hot water stored in the bathtub BT can be discharged to the upstream side of the exhaust heat recovery device 42 in the drainage channel DR. The on-off valve 9 is constituted by a valve body having a drive source. The on-off valve 9 according to the present embodiment is configured by an electric ball valve, and is opened and closed by an instruction from the control device 10.

  The control device 10 includes a control board including a CPU and the like. When the control device 10 determines that the bathing is being performed based on the information acquired by the bathing information acquisition device 8, the control device 10 maintains the on-off valve 9 in a closed state, while the information acquired by the bathing information acquisition device 8 is used as a basis. The open / close valve 9 is opened when it is determined that there is no hot water on the path connected to a location other than the bathroom BR based on the detection result of the hot water detection device 7. Yes.

  In the present embodiment, the bathing information acquisition device 8 is, as described above, a detection sensor (flow sensor) that detects the presence or absence of hot water distribution on the route (first piping 61) connected to the bathroom BR in the piping system 6. Therefore, the control device 10 determines that the hot water is flowing on the route leading to the bathroom BR based on the detection result of the detection sensor 8, and determines that the bath is taking a bath. When it is determined that there is no circulation of hot water on the route leading to the bathroom BR based on the detection result, the bath is determined not to be bathing.

  That is, since the bather uses hot water in the shower or currant of the bathroom BR during bathing, it can be determined whether or not the bather is taking a bath based on the presence or absence of hot water on the path (first pipe) 61 connected to the bathroom BR. Therefore, the hot water supply system 1 according to the present embodiment takes a bath when the control device 10 determines that there is hot water circulation on the path (first pipe) 61 connected to the bathroom BR based on the detection result of the detection sensor 8. It is assumed that the hot water in the bathtub BT is prevented from being discharged for a predetermined time (for example, during the bathing time), and the control device 10 is connected to the bathroom BR based on the detection result of the detection sensor 8 ( When it is determined that there is no circulation of hot water on the first pipe 61 and there is circulation of hot water on the path (second pipe) 62 connected to a place other than the bathroom BR based on the detection result of the hot water supply detection device 7. Judging, there are no bathers in the bathroom BR As a condition for hot water supply in a location other than the bathroom BR in the absence) state, and is configured to open and close valve 9 open.

  The hot water supply system 1 according to the present embodiment is as described above. Next, the operation of the hot water supply system 1 will be described.

  The hot water supply system 1 maintains the on-off valve 9 in the closed state when the control device 10 determines that bathing is in progress based on the information acquired by the bathing information acquisition device 8. In the present embodiment, since the bathing information acquisition device 8 is composed of a flow sensor, the control device 10 can connect the piping system 6 (first piping 61) by using hot water in a shower or currant in the bathroom BR. ) When the flow sensor 8 detects the hot water circulating in the flow sensor 8 and is turned ON, it is determined that the bath is being bathed based on the detection result (ON signal of the flow switch), and for a predetermined time (during the bath time), The on-off valve 9 is maintained in the closed state. Thereby, the hot water supply system 1 is prevented from discharging hot water in the bathtub BT during bathing.

  In this state, hot water in the bathtub BT is not discharged, but used hot water (hot water) flows into the drainage channel DR from the drainage port D due to the use of hot water in a shower or currant during bathing. And as the warm water (hot water) flowing downstream in the drainage channel DR passes through the flow path (between the first heat transfer cassette 430 ... and the second heat transfer cassette 440 ...) in the exhaust heat recovery device 42, Heat exchange is performed with water flowing through the internal flow path 430a of the exhaust heat recovery device 42 (the internal flow paths 430a and 440a of the first heat transfer cassette 430... And the second heat transfer cassette 440...). As a result, the water flowing through the internal flow paths 430a and 440a of the exhaust heat recovery device 42 flows toward the mixing valve 5 while being heated from room temperature, and the hot water and the mixing valve 5 flowing through the hot water supply piping system 3. And then supplied to the bathroom BR.

  And the said control apparatus 10 does not use hot water in the shower or currant in bathroom BR, and the flow sensor 8 has not detected the hot water distribute | circulated in the piping system 6 (1st piping 61) (flow switch). Is OFF), it is determined that the user is not taking a bath (there is no person in the bathroom BR).

  And the said control apparatus 10 is the state which is not in bathing, The distribution | circulation of the hot water on the path | route (2nd piping) 62 connected to locations other than bathroom BR based on the detection result of the hot-water supply detection apparatus 7 is carried out. If it is determined that there is, the on-off valve 9 is opened. That is, when the hot water supply system 1 determines that the control device 10 is not taking a bath and the water stop cock in the kitchen or the bathroom is opened, the hot water flows through the second pipe 62 of the pipe system 6. The hot water detection device 7 (flow rate sensor) detects the hot water, and the control device 10 distributes the hot water on a path (second pipe) 62 connected to a location other than the bathroom BR based on the detection result of the hot water supply detection device 7. If it is determined that there is, the on-off valve 9 is opened.

  In this state, the hot water of the bathtub BT (used hot water) flows into the drainage channel DR via the drainage system DP. The hot water stored in the bathtub BT is in a large amount, and since it is in a state where heat energy is stored for a relatively long time due to the heat retaining effect etc. of the bathtub BT itself, the use discharged into the drainage channel DR As the hot water (hot water) already passes through the flow path (between the first heat transfer cassette 430... And the second heat transfer cassette 440...) In the exhaust heat recovery device 42, the inside of the exhaust heat recovery device 42. Heat exchange is performed with water flowing through the flow path 430a (the internal flow paths 430a and 440a of the first heat transfer cassette 430 ... and the second heat transfer cassette 440 ...). Thereby, the water flowing through the internal flow paths 430a and 440a of the exhaust heat recovery device 42 flows toward the mixing valve 5 while being heated to a temperature higher than the normal temperature, and the hot water flowing through the hot water supply piping system 3 is used. And mixed with the mixing valve 5 and supplied to a place other than the bathroom BR such as a kitchen or a washroom.

  As described above, the hot water supply system 1 is used when hot water is supplied to the bathroom BR during bathing (when hot water is used in a shower or currant) or when hot water is supplied to a place other than the bathroom BR without bathers. Since the water from the water supply source can be heated using the heat of the hot water, it is not necessary to heat more water than necessary with the water heater 2 to supply a lot of hot water, and energy consumption in the water heater 2 Can be suppressed.

  In addition, this invention is not limited to the said embodiment, Of course, it can add suitably in the range which does not deviate from the summary of this invention.

  The bathing information acquisition device 8 according to the above embodiment is configured by a detection sensor (flow sensor) that detects the presence or absence of hot water distribution on a route connected to the bathroom BR in the piping system 6, and the control device 10 is a detection sensor. When it is determined that there is hot water circulation on the route (first piping) 61 connected to the bathroom BR based on the detection result of 8, the bathroom BR is determined to be bathing, and based on the detection result of the detection sensor 8 When it is determined that there is no circulation of hot water on the route (first piping) 61 that leads to, the bath is determined not to be bathing, but is not limited thereto.

  For example, in general homes, bathing is often performed at a roughly fixed time zone at night, and it can be estimated that a predetermined time zone is being bathed. Therefore, as shown in FIG. You may comprise the timer which can set a predetermined time slot | zone while measuring time. In this case, the control device 10 determines that it is bathing when it is determined that the predetermined time zone is based on the measurement result of the timer, and in a time zone other than the predetermined time zone based on the measurement result of the timer. What is necessary is just to comprise so that it may judge that it is not bathing when it judges that there exists.

  When such a hot water supply system 1 determines that it is a predetermined time zone based on the measurement result of the timer, the hot water supply system 1 assumes that the bath is being bathed and is hot water in the bathtub BT for a predetermined time (for example, during the bathing time). Is discharged, and the control device 10 determines that it is a time zone other than the predetermined time zone based on the measurement result of the timer, and at a place other than the bathroom BR based on the detection result of the hot water detection device 7 If it is determined that there is hot water circulation on the connected path, the on-off valve 9 is opened, assuming that there is no bather in the bathroom BR (no bathing) and hot water is supplied to a place other than the bathroom BR. Then, the hot water in the bathtub BT is discharged to the drainage channel DR.

  Accordingly, the hot water supply system 1 having the above-described configuration is provided in a place other than the bathroom BR when hot water is supplied to the bathroom BR during bathing (when hot water is used in a shower or currant) or when there is no bather as in the above embodiment. When supplying hot water, it is not necessary to heat more water than necessary with the water heater 2 to supply a large amount of hot water, and energy consumption in the water heater 2 can be suppressed.

  Moreover, the said bathing information acquisition apparatus 8 may be comprised with the person detection sensor (human sensor) which detects the presence or absence of the person in bathroom BR, as shown in FIG. In this case, the control device 10 determines that the person is in the bathroom BR based on the detection result of the human detection sensor 8, and determines that the person is in the bathroom BR, and determines that the bathroom BR is based on the detection result of the human detection sensor 8. What is necessary is just to comprise so that it may judge that it is not bathing when it judges that there is no person.

  When the control device 10 determines that there is a person in the bathroom BR based on the detection result of the human detection sensor 8, the hot water supply system 1 having the above configuration assumes that the hot water in the bathtub BT is bathing (bath time). The controller 10 determines that there is no person in the bathroom BR based on the detection result of the human detection sensor 8 and connects to a place other than the bathroom BR based on the detection result of the first detection device. If it is determined that there is hot water circulation on the route, the on-off valve 9 is opened, assuming that there is no bather in the bathroom BR (no bathing) and hot water is supplied to a place other than the bathroom BR. The hot water in the bathtub BT is discharged to the drainage channel DR.

  Therefore, in the hot water supply system 1 as well, when hot water is supplied to the bathroom BR during bathing (when hot water is used in a shower or currant) or when hot water is supplied to a place other than the bathroom BR without bathers, It is not necessary to heat more water than necessary to supply a large amount of hot water, and energy consumption in the water heater 2 can be suppressed.

  Moreover, the bathing information acquisition apparatus 8 may acquire information other than the above as information related to bathing. That is, the “information related to bathing” may be information obtained in accordance with the behavior of the bather in the bathroom, or information obtained by the bather's intention to take a bath, for example, Information on the presence or absence of people in the bathroom (information obtained by a human sensor), information on the presence or absence of hot water accompanying bathing (use or non-use of hot water) (information obtained by a flow switch or flow sensor), bathroom BR Information on the presence or absence of drainage from the drain D (information obtained from the flow switch or flow sensor), information on the bathing time set by the user, etc. Or information by switch operation for indicating that the bather is taking a bath.

  The exhaust heat recovery apparatus 42 according to the above embodiment fluidly connects the first heat recovery body 43 fluidly connecting the plurality of first heat transfer cassettes 430 and the plurality of second heat transfer cassettes 440. The second heat recovery body 44 and the second heat recovery body 44 are combined, but the present invention is not limited to this. For example, as shown in FIG. 8, the exhaust heat recovery device 42 is arranged in a vertically standing state with a plurality of tubes 45 that are stacked in the vertical direction, and one end portion of the plurality of tubes 45. A primary side connection pipe 46 fluidly connected, and a secondary side connection pipe 47 arranged in an upright direction and having the other ends of the plurality of pipe bodies 45 fluidly connected. It may be.

  In this case, each of the plurality of tubular bodies 45 is preferably formed in a meandering shape in plan view. That is, each of the plurality of pipes 45... Connects a plurality of straight portions 450 arranged at intervals in the flow direction of the drainage in the drainage channel DR and one end of the adjacent straight portions 450. 1st turn part 451 ... and 2nd turn part 452 ... which connected the other end part of adjacent straight line part 450 ..., It has straight line part 450 ..., 1st turn part 451 ..., straight line part 450 ..., and It is preferable that the second turn portions 452 are connected in this order.

  It is preferable that the plurality of tubular bodies 45 are set to have the same shape and the same size, and are overlapped in a state where they are completely or substantially completely overlapped over the entire length in the vertical direction. In this case, it is preferable that baffle plates Pa and Pb are erected between the straight portions 450 in the drainage channel DR as shown in FIGS. 9 (a) and 9 (b). That is, between the straight portions 450 connected via the first turn portions 451..., The first turn portion 451 extends from one wall surface Wa of the pair of wall surfaces Wa and Wb facing each other to define the drainage channel DR. The first baffle plate Pa extending toward the second wall portion Wb is disposed between the straight wall portions 450 connected via the second turn portions 452 and the second wall surface Wb. It is preferable to arrange the second baffle plate Pb extending toward the two-turn portions 452.

  In this way, in the area where the exhaust heat recovery device 42 of the drainage channel DR is disposed, the flow path of the drainage (used hot water) becomes a meandering channel along the pipe body 45. 42, the section in which the water in the pipe (45) can be heat-exchanged with the exhausted warm water flowing through the drainage channel DR becomes longer, and the water in the tubular body 45 and the used hot water flowing through the drainage channel DR are Since it becomes a completely counterflow, the water from a water supply source can be heated effectively. In addition, by providing the first baffle plate Pa and the second baffle plate Pb, the flow path width of the meandering flow path becomes narrower than the flow path width of the drainage channel DR. Heat exchange efficiency with water can be increased. Thereby, the exhaust heat recovery apparatus 42 having the above-described configuration can efficiently heat water from the water supply source.

  In the above embodiment, the control device 10 has been described as an independent configuration. However, the present invention is not limited to this. For example, the control board provided in the water heater 2 has the above function, and the control board is It is good also as the control apparatus 10 of the hot water supply system 1. FIG.

  DESCRIPTION OF SYMBOLS 1 ... Hot water supply system, 2 ... Water heater, 3 ... Hot water supply piping system, 4 ... Water supply piping system, 5 ... Mixing valve, 6 ... Piping system, 7 ... Hot water supply detection apparatus, 8 ... Bathing information acquisition apparatus (detection sensor: flow) Switch), 8a ... bathing information acquisition device (timer), 8b ... bathing information acquisition device (human detection sensor), 9 ... on-off valve, 10 ... control device, 40 ... primary side water supply pipe, 41 ... secondary side water supply pipe, 42 ... Waste heat recovery device, 43 ... First heat recovery body, 44 ... Second heat recovery body, 60 ... Main piping, 61 ... First piping, 62 ... Second piping, 430 ... First heat transfer cassette, 430a ... Internal flow path, 431a ... connection part (first connection part), 431b ... connection part (second connection part), 440 ... second heat transfer cassette, 440a ... internal flow path, 441a ... connection part (third connection part) 441b ... connecting part (fourth connecting part), BR ... bathroom, BT ... tub, C ... lid, DP Drainage system, DR ... drainage, P ... heat transfer plate

Claims (4)

  A water heater that heats water from a water supply source into hot water, a hot water supply piping system connected to the water heater, a water supply piping system connected to the water supply source, a hot water supply piping system, and a water supply piping system And a piping system that connects the mixing valve to a plurality of locations including the bathroom, and the heat of the used hot water flowing through the drainage channel connected to the drainage port of the bathroom in the middle of the water supply piping system. Hot water supply that is equipped with a waste heat recovery device that recovers water and mixes hot water from the hot water supply piping system with hot water from the hot water supply piping system using a mixing valve to make hot water at an appropriate temperature, and can supply hot water to multiple locations including the bathroom In the system, a hot water supply detection device for detecting the presence or absence of hot water distribution on a route connected to a place other than the bathroom in the piping system, a bathing information acquisition device for acquiring information related to bathing, and a lower part of a bathtub in the bathroom On-off valve that opens and closes the drainage system connected to the And a control device that opens and closes the on-off valve based on the detection result of the bathing information acquisition device, and the drainage system is configured to discharge the hot water stored in the bathtub to the upstream side of the exhaust heat recovery device in the drainage channel When the control device determines that the bathing information is acquired based on the information acquired by the bathing information acquisition device, the control device maintains the open / close valve in a closed state, while the bathing information acquisition device is not taking a bath based on the information acquired. A hot water supply system that opens and closes an open / close valve when it is judged that there is hot water circulation on a route connected to a location other than a bathroom based on a detection result of a hot water detection device.   The bathing information acquisition device is configured by a detection sensor that detects the presence or absence of hot water distribution on a path that leads to the bathroom in the piping system, and the control device is on a path that leads to the bathroom based on the detection result of the detection sensor. When it is determined that there is no hot water circulation, it is determined that it is bathing, and based on the detection result of the detection sensor, it is determined that there is no hot water distribution on the route leading to the bathroom, and it is determined that it is not bathing. The hot water supply system according to claim 1 configured as described above.   The bathing information acquisition device is configured by a timer capable of measuring time and setting a predetermined time zone, and the control device is bathing when it is determined that the predetermined time zone is based on the measurement result of the timer. The hot water supply system according to claim 1, wherein the hot water supply system is configured to determine that there is no bathing when it is determined that there is a time zone other than the predetermined time zone based on the measurement result of the timer.   The bathing information acquisition device is composed of a human detection sensor that detects the presence or absence of a person in the bathroom, and the control device is bathing when it is determined that there is a person in the bathroom based on the detection result of the human detection sensor. The hot water supply system according to claim 1, wherein the hot water supply system is configured to determine that the user is not taking a bath when it is determined that there is no person in the bathroom based on the detection result of the human detection sensor.

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