JP2019190716A - Heating system and route switching unit - Google Patents

Abstract

To prevent bathtub water in a circulation route from entering a heating circuit and prevent heating water from flowing into a bathtub at the time of switching in a heating system that can switch whether to circulate bathtub water to a heat exchanger installed in an air supply duct or to circulate hot water in the heating circuit to the heat exchanger.SOLUTION: A heating system includes: a circulation route from a bathtub 5 back to the bathtub through a heat exchange outward pipe 85, a heat exchanger 60, and a heat exchange return pipe 86; a circulation pump 45 for circulating bathtub water in the circulation route; a heat source machine 10 having a heating circulation pump 26 for circulating hot water in a heating circuit, and a heat source part 12; a switching part 40 for switching a circuit between a second connection state in which the heat exchanger 60 is separated from the circulation route and connected to the heating circuit and a first connection state in which the heat exchanger is interposed in the circulation route; and a drain valve 44 provided to the heat exchange return pipe on the downstream side of the circulation pump 45 and on a bathtub side as compared with the place where the heat exchanger 60 is separated in the second connection state. When the route is switched, the bathtub water and hot water remaining in the circulation route can be drained from the drain valve 44.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a heating system and a path switching unit that circulate hot water through a heat exchanger installed at an air supply port that takes outside air indoors.

  Modern houses have a 24-hour ventilation system. As shown in FIG. 17, for example, a ventilation fan 101 is provided in the back of a ceiling of a bathroom, for example, and the suction port 102 of the ventilation fan 101 is connected to a ceiling of a toilet, a washroom, a bathroom, etc. The air supply port (air supply duct) 103 is provided on the wall of each living room facing the outside, and the exhaust of the ventilation fan 101 is exhausted to the outside through the duct through the exhaust port 104 provided at the entrance or the like. The configuration is as follows. This is a method in which exhaust is performed by a fan and air supply is taken in naturally without using a fan (exhaust type), and is widely used in ordinary houses.

  By the way, in the winter, cold outside air enters the room from the air inlet 103. In the house shown in FIG. 17, a room such as a living room where people have been living for a long time is heated and warm. The warm air slowly flows toward the suction port at the center of the house, and is sucked from the suction port 102 and discharged to the outside. On the other hand, the Western-style room (1), Western-style room (2), etc. are often not heated from the viewpoint of heating cost saving when used in a bedroom or the like. Also, since warm air does not flow from the living room, the room temperature is low. At dawn, toilets get cold. Therefore, for example, if you enter these rooms after taking a bath, or if you go out of the futon at dawn and go to the toilet, you may receive a heat shock.

  There is a method of using the amount of heat of the remaining hot water in the bath as a method of heating to such an extent that the heat expenses can be prevented by suppressing the utility cost. For example, Patent Document 1 discloses a heating system that circulates hot water in a bathtub to a heat exchanger that receives air from a fan.

  However, in this heating system, since the temperature difference between room temperature and the remaining hot water in the bathtub is small, the heat dissipation efficiency is low, and a large heat exchanger is required to obtain the required amount of heat.

JP 2000-283558 A

  As shown in FIG. 18, the applicant of the present application attaches a heat exchanger 110 that circulates the remaining hot water of a bath in an air supply duct 103 of a 24-hour ventilation system, and cools outdoor cold air through the air supply duct 103. A heating system has been devised in which the heat exchanger 110 warms the outside air a little when it is taken indoors. Since the outside air is colder than the room air, the heat exchange efficiency is higher than when the room air is warmed.

  However, since the heat exchanger attached to the air supply duct 103 must be reduced in size, better heat exchange efficiency is desired. Therefore, the method of circulating the bathtub water on the primary side of the water-water heat exchanger and circulating the water on the secondary side to the heat exchanger in the air supply duct 103 is based on the heat through the water-water heat exchanger. Since exchange efficiency falls, it is not preferable.

  On the other hand, even after the remaining hot water in the bath has cooled down or when there is no remaining hot water, it is desired that the outside air is slightly warmed by the heat exchanger provided in the air supply duct 103 and then introduced into the room. For this purpose, the hot water in the heating circuit may be circulated to the heat exchanger in the air supply duct 103. In this case, too, the hot water in the heating circuit is directly supplied without going through the water-water heat exchanger. It is preferable to circulate through the heat exchanger of the air duct 103.

  Then, the path for circulating the bath water to the heat exchanger of the air supply duct 103 and the path for circulating the hot water of the heating circuit to the heat exchanger of the air supply duct 103 must be switched. It is not preferable that the bathtub water remaining in the path enters the heating circuit or the hot water in the heating circuit flows into the bathtub.

  The present invention has been made in view of the above problems, and it is possible to switch between circulating bath water or circulating hot water in a heating circuit in a heat exchanger provided at an air supply port for taking in outside air. And it aims at providing the heating system and path switching unit which can prevent the bathtub water in a path | route entering a heating circuit at the time of switching, or the warm water of a heating circuit flowing into a bathtub.

  The gist of the present invention for achieving the object lies in the inventions of the following items.

[1] a heat exchanger installed at an air supply port for taking outside air indoors;
A heat transfer pipe from the bathtub to the entrance of the heat exchanger;
A heat exchange return pipe from the outlet side of the heat exchanger to the bathtub;
A circulation pump that circulates bathtub water in the bathtub to a circulation path that returns to the bathtub from the bathtub through the heat exchange pipe, the heat exchanger, and the heat exchange return pipe;
A heating circulation pump that circulates the heat medium fluid in the heating circuit; and a heat source unit that includes a heat source unit that heats the heat medium fluid in the heating circuit;
A switching unit that switches the path between a second connection state in which the heat exchanger is disconnected from the circulation path and connected to the heating circuit, and a first connection state in which the heat exchanger is inserted in the circulation path;
Provided in the heat return pipe on the bathtub side from a location downstream of the circulation pump and where the heat exchanger is disconnected in the second connection state, and the heat return pipe on the heat exchanger side is connected to the bathtub side A communication valve connected to the heat exchange return pipe, and a drain valve for switching the heat exchange return pipe on the heat exchanger side to a drainage side connected to a predetermined drainage destination,
A heating system characterized by comprising:

  In the said invention, the hot water remaining in the circulation path containing a heat exchanger, a heat exchange pipe, and a heat exchange return pipe can be drained outside from a drain valve. Thereby, when the path is switched by the switching unit, it is possible to prevent the bathtub water in the circulation path from entering the heating circuit and the heat medium fluid of the heating circuit from flowing into the bathtub.

[2] Perform first drainage control to set the drainage valve to the drainage side for the first predetermined time for operating the circulation pump after switching the switching unit from the second connection state to the first connection state. The heating system according to [1], characterized in that

  In the said invention, if a heating circulation pump is operated in a 2nd connection state, the heat-medium fluid of a heating circuit will circulate through the circulation path by the side of a heat exchanger from a separation part. When the circulation pump is operated by switching from this state to the first connection state, the heat medium fluid in the circulation path on the heat exchanger side flows into the bathtub from the disconnection point. After switching from the state to the first connection state, the drain valve is set to the drain side for the first predetermined time for operating the circulation pump, and the heat medium fluid in the circulation path is drained to the drain destination.

[3] The switching unit disconnects the inlet side of the heat exchanger from the circulation path and connects it to the heating circuit, and connects the outlet side of the heat exchanger to the heat return pipe of the circulation path. It can be switched to 3 connected states
Performing the second drainage control in which the switching unit is set to the third connection state and the drainage valve is set to the drainage side, and the heating medium fluid is sent from the heating circuit toward the heat exchanger. The heating system according to [1] or [2], which is characterized.

  In the said invention, by performing 2nd waste_water | drain control, the bathtub water remaining in a heat exchanger, a heat transfer pipe | tube, and a heat exchange return pipe | tube is drained to a waste_water | drain destination, and it replaces with the heat medium fluid by the side of a heating circuit. The second drainage control is performed, for example, when switching from the operation of circulating bath water to the heat exchanger in the first connection state to the operation of circulating the heat medium fluid of the heating circuit to the heat exchanger in the second connection state.

[4] The heat source machine has a bath replenishing function for circulating the bath water through the reheating path and raising the temperature, and a water injection function for injecting water into the bathtub through the reheating path,
The switching unit can further switch between a fourth connection state in which the bathtub is disconnected from the circulation path and connected to the reheating path, and a fifth connection state in which the reheating path is connected to the circulation path,
The switching unit is set to the fifth connection state, the drain valve is set to the communication side, and third drainage control is performed to inject water into the bathtub through the reheating path and the circulation path. The heating system according to any one of [1] to [3].

  In the above invention, bathing is performed by setting the switching unit to the fourth connection state. When the third drainage control for setting the fifth connection state and pouring water into the bathtub is performed, water is poured into the bathtub via the circulation path and the reheating path including the heat exchanger, the heat exchange pipe, and the heat exchange return pipe. Therefore, it is possible to clean the reheating path and the circulation path.

[5] The switching unit includes:
The heat exchanger tube is inserted in the middle of the heat exchanger tube, and the heat exchanger tube on the heat exchanger side is connected to the heat exchanger tube on the bathtub side, or the heat exchanger tube on the heat exchanger side is connected to the heating circuit. A first switching valve that switches whether to connect to the return pipe;
The heat exchanger tube is inserted in the middle of the heat exchanger tube, and the heat exchanger side heat exchanger tube is connected to the bathtub side heat exchanger tube, or the heat exchanger side heat exchanger tube is connected to the heating circuit. A second switching valve for switching whether to connect to the outgoing pipe of
The second switching valve is inserted in the middle of the thermal exchange pipe on the bathtub side, and the thermal exchange pipe on the bathtub side is connected to the thermal exchange pipe on the second switching valve side, or A third switching valve for switching whether to connect the heat transfer pipe on the bathtub side to the return pipe of the reheating path of the bath;
Have
The circulation pump is inserted in the heat transfer pipe between the second switching valve and the third switching valve, and feeds water from the third switching valve side to the second switching valve side,
The drain valve is provided in the heat exchange return pipe on the bathtub side from the first switching valve,
An outgoing pipe of the reheating path is connected to a heat exchange return pipe between the first switching valve and the drain valve;
The switching unit further includes
A first check that connects the return pipe of the reheating path and the outlet side of the circulation pump with a pipe and prevents a flow from the outlet side of the circulation pump to the return pipe side of the reheating path in the middle of the pipe. A valve,
A second check valve provided in the middle of the outgoing pipe of the reheating path;
The heating system according to any one of [1] to [4], characterized by comprising:

  The above invention is a specific configuration example of the switching unit.

[6] In the heat exchanger, a plurality of hollow flat plate-like flat tubes are laminated at intervals, and adjacent flat tubes are connected in the laminating direction by connecting portions on one end side and the other end side, respectively. Any one of [1] to [5] is characterized in that the fluids that are connected and flow into the inflow port flow out from the outflow port through the respective flat tubes and the connection portions. The heating system described.

[7] A path switching unit including a switching unit, a drain valve, and a circulation pump in the heating system according to any one of [1] to [6].

  According to the heating system and the path switching unit according to the present invention, it is possible to switch between circulating bath water or circulating heat medium fluid in the heating circuit in the heat exchanger provided in the air supply port, and this By switching, it is possible to prevent bathtub water in the path from entering the heating circuit and heat medium fluid in the path from flowing into the bathtub.

It is a figure which shows schematic structure of the heating system which concerns on embodiment of this invention. It is a figure which shows the state which inserted the heat exchange unit in the air supply duct. It is a perspective view which shows a heat exchange unit. It is a figure which shows three types of flat tubes which comprise a heat exchanger. It is a figure which shows the water flow path | route in one reciprocating type heat exchanger. It is a figure which shows the water flow path in a parallel type heat exchanger. It is a figure which shows the flow of the hot water in a chasing operation | movement. It is a figure which shows the circulation path of warm water in the case of performing supply air preheating with the heat exchange unit of a living room, performing heating operation with the warm water mat for floor heating. It is a figure which shows the circulation path of warm water in the case of performing supply air preheating in the heat exchange unit of a living room, without performing the heating by the hot water mat for floor heating. It is a figure which shows the circulation path of warm water in the case of performing supply air preheating with the heat exchange unit of a living room, and heat exchange units, such as a bedroom, without heating by the hot water mat for floor heating. It is a figure which shows the circulation path | route of warm water in the case of circulating supply of warm water for heating and performing supply air preheating with a heat exchange unit such as a bedroom. It is a figure which shows the circulation path | route of warm water in the case of circulating bathtub water and performing supply air preheating with heat exchange units, such as a bedroom. It is a figure which shows the circulation path of warm water in the case of performing the air supply preheating by bathtub water in heat exchange units, such as a bedroom, and the air supply preheating by warm water of a heating circuit in a heat exchange unit of a living room in parallel. It is a figure which shows the water flow path | route when performing 1st drainage control. It is a figure which shows the water flow path | route when performing 2nd waste_water | drain control. It is a figure which shows a water flow path | route when performing 3rd waste_water | drain control. It is a figure which shows the example of installation of a 24-hour ventilation system. It is a figure which shows an example of the state which attached the heat exchanger to the air inlet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a heating system 8 according to an embodiment of the present invention. The heating system 8 includes a hot water supply / heating heat source unit 10, a path switching unit 40, a radiator 3 for heating, and a heat exchange unit 60 provided in an air inlet (air supply duct) 103 of a 24-hour ventilation system. Yes. Here, the heat exchange unit 60 is provided in the air supply duct 103 of the living room which is the south side room, and in the air supply duct 103 of the bedroom or other room (such as the north side room). The heating radiator 3 is a hot water mat for floor heating, but is not limited thereto.

  The heating system 8 is a hot water supply function that heats the water supply to supply hot water to a shower in the bathroom or a kitchen faucet, a pouring function that drops the hot water into the bathtub 5 and fills the bathtub water in the bathtub 5 Reheating function to raise the temperature, heating function to circulate hot water through the radiator 3 for heating such as a hot water mat for floor heating, and the outside air by circulating hot water and bathtub water to the heat exchange unit 60 It has an air supply preheating function to exchange heat with the air. In addition, hot water at the bath set temperature is automatically filled in the bathtub so as to reach the set water level, and the set water level and bath set temperature are maintained for a predetermined time (for example, 4 hours) after the hot water is filled. It is equipped with a function for automatic bath operation, such as retreating.

  The hot water supply / heating heat source unit 10 of the heating system 8 includes a first heat exchanger 11 for hot water supply heated by a burner and a second heat exchanger 12 for reheating and heating. Each of the first heat exchanger 11 and the second heat exchanger 12 includes sensible heat exchangers 11a and 12a and latent heat exchangers 11b and 12b for recovering the latent heat of the exhaust.

  When the faucet provided at the tip of the hot water supply pipe 14 is opened, the water supplied from the water supply source is discharged through the water supply pipe 13, the water pipe of the first heat exchanger 11 and the hot water supply pipe 14. The water supply pipe 13 is provided with a water amount sensor 15 and a water amount servo 16 for adjusting (limiting) the amount of water. The water supply pipe 13 and the hot water supply pipe 14 are connected by a bypass pipe 17 immediately downstream of the water quantity servo 16, and a bypass servo 18 for adjusting the amount of water flowing through the bypass pipe 17 is provided in the middle of the bypass pipe 17.

  The hot water supply pipe 14 has a heat exchange temperature sensor 21 for detecting the hot water temperature immediately after leaving the first heat exchanger 41, and a hot water supply temperature sensor for detecting the hot water temperature (hot water temperature) after the supply of water from the bypass pipe 17 merges. 22 is provided.

  Hot water returned from the return pipe 81 of the heating circuit that circulates hot water to the hot water mat 3 for floor heating to the hot water supply / heating heat source machine 10 is the latent heat exchange of the collective header 23, the in-machine return pipe 24, and the second heat exchanger 12. The heater 12b, the open air system turn 25, the heating circulation pump 26, and a part of the heating circuit from the branching point downstream of the heating circulation pump 26 via the in-machine outgoing pipe 27 and the thermal valve branch header 28 It flows out to the outgoing pipe (low temperature outgoing pipe) 82.

  The collective header 23 joins the hot water from the return pipe 81 and the hot water from the heating return pipe 88 and sends them to the in-machine return pipe 24. The thermal valve branch header 28 has a function of branching the hot water from the in-machine forward pipe 27 into the forward pipe 82 and the heating forward pipe 87, and switches between whether to send the hot pipe to the forward pipe 82 or not. It incorporates a thermal valve that switches whether or not the pipe 87 is delivered. A heating forward pipe 87 and a heating return pipe 88 are also included in the heating circuit.

  The other part of the hot water branched off at the branching point downstream of the heating circulation pump 26 passes through the sensible heat exchanger 12a of the second heat exchanger 12, and the flow rate control valve 29, the reheating water-water heat exchanger. 30 joins the in-flight return pipe 24 through the primary water pipe 30 and the return pipe 31. The amount of hot water flowing to the primary side of the reheating water-water heat exchanger 30 is adjusted by the flow control valve 29.

  The recirculation return pipe 32 connected to the inlet side of the secondary side water pipe of the reheating water-water heat exchanger 30 is provided with a bath flow water switch 33 and a bath circulation pump 34, and the reheating water-water heat exchanger is provided. A retrace pipe 35 is connected to the outlet side of the secondary water pipe 30. Further, a pouring pipe 36 branched from the hot water supply pipe 14 downstream of the hot water supply temperature sensor 22 joins and is connected in the middle of the reheating pipe 35. A pouring valve 37 for opening and closing the pouring pipe 36 is provided in the middle of the pouring pipe 36.

  The forward piping 82 of the heating circuit is connected to the entry side of the hot water mat 3 for floor heating installed under the floor of the living room or the like, and the outlet side of the hot water mat 3 for floor heating passes through the water pipe 83 and passes through the water pipe 83. A heat exchange unit 60 installed in the air supply duct 103 is connected to the inlet side, and a return pipe 81 is connected to the outlet side of the heat exchange unit 60. The return pipe 81 is connected to the collective header 23 of the hot water supply / heating heat source machine 10. A switching valve 84 is interposed in the forward piping 82 in front of the hot water mat 3 for floor heating. The switching valve 84 switches whether the forward pipe 82 is connected to the entry side of the hot water mat 3 for floor heating or whether the hot water mat 3 for floor heating is bypassed and connected to the water pipe 83. The switching valve 84 is switched according to a control signal from the control unit 93 described later. The switching valve 84 may be a type that is manually switched.

  The first connection port of the path switching unit 40 is connected to the other end of a heat exchange pipe 86 having one end connected to the outlet side of the heat exchange unit 60 provided in the air supply duct 103 such as a bedroom. The other end of the heating return pipe 88 having one end connected to one inlet of the collective header 23 is connected to the second connection port of the path switching unit 40. The third connection port of the path switching unit 40 is connected to the other end of the heating forward pipe 87 having one end connected to one outlet of the thermal valve branch header 28 of the hot water supply / heating heat source machine 10. The other end of the heat transfer pipe 85 having one end connected to the entrance side of the heat exchange unit 60 provided in the air supply duct 103 such as a bedroom is connected to the fourth connection port.

  Moreover, the other end of the bath return pipe 89 whose one end is connected to the inlet of the circulation fitting of the bathtub 5 is connected to the fifth connection port of the path switching unit 40, and the hot water supply / heating heat source machine 10 is connected to the sixth connection port. The other end of the recirculation return pipe 32 having one end connected to the inlet side of the bath circulation pump 34 is connected. The seventh connection port of the path switching unit 40 is connected to the other end of the bath outlet pipe 90 whose one end is connected to the outlet of the circulation fitting of the bathtub 5. Connected to the eighth connection port of the path switching unit 40 is the other end of the retreating pipe 35 having one end connected to the outlet side of the secondary water pipe of the reheating water-water heat exchanger 30 of the hot water supply / heating heat source unit 10. Has been.

  The bath return pipe 89 is connected to the heat transfer pipe 85 inside the path switching unit 40 when the bath water is circulated to the heat exchange unit 60 in the bedroom, and is connected to the heat exchange unit 85 in the bathtub 5 and the bedroom. It is a part of the pipe (heat transfer pipe in the claims) connecting the inlet side. When the bath water 90 is circulated to the heat exchange unit 60 in the bedroom, the bath outlet tube 90 is connected to the heat exchange return pipe 86 inside the path switching unit 40, and the outlet side of the bathtub 5 and the heat exchange unit 60 in the bedroom. Is a part of a pipe (heat exchange return pipe in claims).

  The path switching unit 40 includes a first three-way valve 41, a second three-way valve 42, a third three-way valve 43, a drain valve 44, a bath water circulation pump 45, a first check valve 46, and a second check valve 47. It has. Each of the three-way valves 41 to 43 and the drain valve 44 includes a first connection port, a second connection port, and a third connection port, respectively, and a first and second communication side in which the first connection port and the second connection port communicate with each other; It can switch to the 1st 3rd communication side which made the 1st connection port and the 3rd connection port communicate. In the figure, each connection port is given a corresponding number.

  The first connection port of the path switching unit 40 is connected to the first connection port of the first three-way valve 41, and the second connection port of the path switching unit 40 is connected to the third connection port of the first three-way valve 41. . The third connection port of the path switching unit 40 is connected to the third connection port of the second three-way valve 42, and the fourth connection port of the path switching unit 40 is connected to the first connection port of the second three-way valve 42. .

  The fifth connection port of the path switching unit 40 is connected to the first connection port of the third three-way valve 43, and the sixth connection port of the path switching unit 40 is connected to the third connection port of the third three-way valve 43. . The seventh connection port of the path switching unit 40 is connected to the second connection port of the drain valve 44, and the eighth connection port of the path switching unit 40 is connected to the entry side of the second check valve 47.

  The second connection port of the first three-way valve 41 is connected to the first connection port of the drain valve 44 by an internal pipe, and the internal pipe branches in the middle and is connected to the outlet side of the second check valve 47. ing. The second check valve 47 prevents a flow from the second connection port side of the first three-way valve 41 toward the eighth connection port of the path switching unit 40.

  The second connection port of the second three-way valve 42 is connected to the second connection port of the third three-way valve 43 by an internal pipe, and a hot water circulation pump 45 is inserted in the middle of the internal pipe. The hot water circulation pump 45 feeds water from the second connection port side of the third three-way valve 43 toward the second connection port side of the second three-way valve 42. A first check valve 46 is provided between the third connection port of the third three-way valve 43 and the outlet side of the hot water circulation pump 45. The first check valve 46 prevents a flow from the outlet side of the bath water circulation pump 45 toward the third connection port of the third three-way valve 43.

  The hot water supply / heating heat source machine 10 includes a control unit 93 that controls the operation of each unit. The control unit 93 includes a circuit having a CPU, ROM, RAM, and the like as main parts, and controls operations of the hot water supply / heating heat source unit 10, the path switching unit 40, and the switching valve 84 (when not manually). The control unit 93 is connected to a remote controller 97 having a function of accepting various operations from the user and a function of displaying various information. The control unit 93 may be connected to a network, and may receive a remote operation from each user's portable information processing terminal through the network. The portable information processing terminal may be a tablet or a smartphone in which an application related to the browser or the heating system 8 is installed.

  The heat exchange unit 60 of the heating system 8 is installed in the air supply duct 103 of the 24-hour ventilation system shown in FIG. The heating system 8 has a function of warming a cold outdoor air in winter and introducing it into the room by circulating warm water flowing in the heating circuit or warm bathtub water in the bathtub to the heat exchange unit 60. The function of warming the outside air by the heat exchange unit 60 and introducing it into the room is referred to as a supply air preheating function. In addition, if the bathtub water in the bathtub 5 is circulated to the heat exchange unit 60 and air supply preheating is performed, a bathing function that lowers the temperature of the bathtub water is realized.

  FIG. 2 shows a state in which the heat exchange unit 60 is inserted into the air supply duct 103. An air supply port cover 108 is attached to the outdoor side entrance of the air supply duct 103. The air inlet cover 108 forms an air passage that covers the front, upper, and lower sides of the air inlet duct 103 and penetrates left and right before the inlet on the outdoor side of the air duct 103, and extends from the ground to the outer wall of the building. Thus, the wind blown from below is prevented from directly entering the air supply duct 103.

  FIG. 3 is a perspective view showing the heat exchange unit 60. The heat exchange unit 60 includes a heat exchanger 61 through which hot water is passed, and a partition plate 62 that blocks a gap between the outer edge of the heat exchanger 61 and the inner wall of the air supply duct 103. The heat exchanger 61 of the heat exchange unit 60 has a structure in which a plurality of flat tubes 63 are stacked with a gap therebetween. Each flat tube 63 has a thin flat plate shape with a hollow inside and a rectangle (here, approximately square). The height of the internal cavity (water channel) of each flat tube 63 is 0.6 mm, the thickness (plate thickness) of the wall surface constituting the internal cavity is 0.2 mm, and the interval between the laminated flat tubes 23 is 2.2 mm. ing. Each size of the flat tube 63 is not limited to this.

  The heat exchanger 61 includes a hot water inlet 65 and an outlet 66, and the hot water flowing into the inlet 65 flows out of the outlet 66 through the stacked flat tubes 63.

  The structure of the heat exchanger 61 will be described in more detail.

  Each rectangular flat tube 63 includes connection portions 64 at two corners located on one diagonal line, and the flat tubes 63 adjacent in the stacking direction are connected to each other by the connection portion 64. The connecting portion 64 has a short cylindrical shape protruding from the wall surface of the flat tube 63 to a height of about one-half of the stacking interval, and the wall surface (one of the front and back sides of the flat tube 63 at a position where the connecting portion 64 is located). Both sides are provided with holes that lead to the cylindrical connecting portion 64.

  As shown in FIG. 4, in the present embodiment, the flat tube 63 is diagonally formed with a through-type flat tube 63 a in which holes are formed in the front and back wall surfaces of both of the two connecting portions 64 on the diagonal line. A hole is formed in the wall surface on the back side in both of the two connection portions 64, and the wall surface on the front side is diagonally opposite to the one-surface flat tube 63b in which a hole is opened at a position corresponding only to the connection portion 64 on one side. There are three types of one-sided flat tubes 63c in which holes are opened in the front wall surface at both of the connection portions 64, and the holes on the back wall surface are opened at positions corresponding to only one connection portion 64, By combining these, the heat exchanger 61 of various water flow paths is configured.

  For example, as shown in FIG. 5, from the top, a single surface flat tube 63b × 1, a through flat tube 63a × 2, a single back flat tube 63c × 1, a single surface flat tube 63b × 1, a through flat When the tubes 63a × 2 and the single-sided flat tube 63c × 1 are stacked, a single-reciprocating heat exchanger in which hot water flows as shown by a broken line in the drawing is configured. When the number of flat tubes 63 is large, a two-reciprocating type, a three-reciprocating type, etc. can be used. In the case of the reciprocating type, the inlet 65 and the outlet 66 are formed on the same connecting portion side.

  On the other hand, as shown in FIG. 6, it is also possible to configure a parallel heat exchanger 61 in which warm water flows in the same direction in all the flat tubes 63. In this example, a single-surface flat tube 63b × 1, a penetrating flat tube 63a × 5, and a single-side flat tube 63c × 1 are stacked from the top. In the case of the parallel type, the inflow port 65 is formed in one connection portion 64, and the outflow port 66 is formed in the other connection portion 64. Configurations such as outbound, inbound and outbound are possible.

  By connecting the flat tubes 63, the connection portions 64 of the adjacent flat tubes 63 are connected and connected. If the connecting portions 64 having holes in the wall surfaces are connected to each other, the flat tubes 63 adjacent to each other at the location communicate with each other via the connecting portion 64.

  The partition plate 62 is disposed so as to be orthogonal to each flat tube 63 and to face an oblique direction with respect to the extending direction of the air supply duct 103. Here, it arrange | positions along the diagonal line different from the diagonal line which connects the two corner | angular parts in which the connection part 64 is arrange | positioned (refer FIG. 3).

  A rectangular opening is formed in the partition plate 62, and the heat exchanger 61 is accommodated therein.

  The passage area of the air supply duct 103 is smallest at the opening portion of the partition plate 62. When the partition plate 62 is provided orthogonal to the extending direction of the air supply duct 103, if the air supply duct 103 is circular in cross section, the rectangular opening of the maximum size that can be formed in the partition plate 62 is square. . On the other hand, when the partition plate 62 is disposed obliquely with respect to the extending direction of the air supply duct 103, the outer shape of the partition plate 62 becomes elliptical, and therefore the maximum size that can be formed in the elliptical partition plate 62. The rectangular opening is rectangular, and the opening area is larger than the square opening described above. As a result, the airflow resistance when the airflow in the air supply duct 103 passes through the heat exchanger 61 can be reduced.

  Next, operations related to various functions of the heating system 8 will be described.

<Hot-water supply operation>
When the hot water tap is opened and the water amount sensor 15 of the hot water supply / heating heat source unit 10 detects water flow, the controller 93 turns on the combustion fan (not shown) and ignites the burner on the first heat exchanger 11 side for combustion. Burn the gas. The feed water flowing into the feed pipe 13 from the feed water source is heated when passing through the first heat exchanger 11 (sensible heat exchanger 11a and latent heat exchanger 11b), and further the bypass pipe whose water amount is adjusted by the bypass servo 18 The hot water is mixed with the water supplied from 17 and made hot water at a set temperature and discharged from the hot water supply pipe 14 to the hot water tap.

<Pouring operation>
The pouring operation is executed when automatic bath operation starts or when an instruction for pouring is received from the user using the remote controller 97 or the like. In the pouring operation, the controller 93 opens the pouring valve 37 and operates the combustion fan to ignite the burner on the first heat exchanger 11 side and burn the combustion gas. Further, the drain valve 44 of the path switching unit 40 is set to the first second communication side (the side that does not drain), and the third three-way valve 43 is set to the first third communication side. As a result, the hot water generated in the same manner as the hot water supply operation flows into the recirculation pipe 35 and recirculation return pipe 32 through the pouring pipe 36, and the third three-way valve 43 (from the third connection port) in the path switching unit 40. (Passed to the first connection port), the drain valve 44 (passed from the first connection port to the second connection port), and dropped into the bathtub 5 from the bath return pipe 89 and the bath outlet pipe 90. If the above operation is performed without burning the burner, a water injection operation for pouring water into the bathtub 5 is performed.

<Casting action>
FIG. 7 shows the flow of hot water in the chasing operation. The reheating operation is performed when the temperature of the bath water in the bathtub 5 is raised to the bath set temperature after the above-described pouring operation is performed based on the instruction of the automatic operation of the bath and the water is filled to the set water level. Alternatively, it is executed when the temperature of the hot water in the bathtub 5 is raised during the automatic operation of the bath to maintain the bath set temperature, or when a revocation instruction operation is received from the user by the remote control 97 or the like.

  In the reheating operation, the control unit 93 opens the flow rate control valve 29, operates the heating circulation pump 26, operates the combustion fan, ignites the burner on the second heat exchanger 12 side, and burns the combustion gas. Let As a result, the heating circulation pump 26, the sensible heat exchanger 12a of the second heat exchanger 12, the flow rate control valve 29, the primary side of the reheating water-water heat exchanger 30, the return pipe 31, and the in-flight return. Hot water circulates in a circuit that returns to the cistern 25 through the pipe 24 and the latent heat exchanger 12 b of the second heat exchanger 12. The circulating hot water is heated when passing through the second heat exchanger 12.

  Further, along with this operation, an operation of circulating the hot water in the bathtub 5 to the secondary side of the reheating water-water heat exchanger 30 is performed. Specifically, the drain valve 44 of the path switching unit 40 is set to the first second communication side (the side that does not drain), the third three-way valve 43 is set to the first third communication side, and the bath circulation of the hot water supply heating heat source machine 10 is set. The pump 34 is activated. As a result, the bath return pipe 89 from the bathtub 5, the third three-way valve 43 in the path switching unit 40, the reheating return pipe 32, the bath circulation pump 34, the bath running water switch 33, and the reheating water-water heat exchanger 30. The bath water circulates so as to return to the bathtub 5 through the secondary side, the follow-up pipe 35, the second check valve 47 and the drain valve 44 in the path switching unit 40, and the bath pipe 90. When the bath water passes through the secondary side of the reheating water-water heat exchanger 30, the temperature of the bath water is raised by exchanging heat with hot water circulating on the primary side of the reheating water-water heat exchanger 30.

<Supply air preheating operation>
The supply air preheating operation includes various operations shown in the following (1) to (6).

(1) Air supply preheating is performed by the heat exchange unit 60 in the living room while performing the heating operation with the hot water mat 3 for floor heating. FIG. 8 shows the flow of hot water in the above case. This operation is performed, for example, when the living room is heated with the hot water mat 3 for floor heating immediately after returning home on a cold night.

  The control unit 93 sets the switching valve 84 so that the outgoing pipe 82 of the heating circuit and the incoming side of the warm water mat 3 for floor heating communicate with each other, closes the flow control valve 29, and goes to the outgoing pipe 82 side of the thermal valve branch header 28. And the heating circulation pump 26 is operated, and the temperature of hot water flowing through the second heat exchanger 12 is raised by the burner on the second heat exchanger 12 side. Thereby, the hot water sent out from the heating circulation pump 26 is supplied to the in-machine forward pipe 27, the thermal valve branch header 28, the forward pipe 82, the hot water mat 3 for the floor heating, the water pipe 83, the heat exchange unit 60 in the living room, The return pipe 81, the collective header 23, the in-machine return pipe 24, the latent heat exchanger 12 b of the second heat exchanger 12, the cistern 25, circulate so as to return to the suction side of the heating circulation pump 26. In addition, in order to increase the temperature of the hot water circulating in the heating circuit, a part of the hot water sent from the heating circulation pump 26 is heated by the sensible heat exchanger 12a of the second heat exchanger 12 and is supplied to the cistern 25. It flows to enter.

(2) Heating with the heat exchange unit 60 in the living room is performed without heating by the hot water mat 3 for floor heating. FIG. 9 shows the flow of hot water in the above case. This operation is performed, for example, after the room is sufficiently warmed by the operation (1). Even if the room warms up, the outside air is cold, so the air supply preheating is continued.

  The control unit 93 sets the switching valve 84 so that the hot water from the outgoing pipe 82 bypasses the hot water mat 3 for floor heating, closes the flow control valve 29, and closes the flow valve 82 on the outgoing pipe 82 side of the thermal valve branch header 28. The thermal valve is opened, the heating circulation pump 26 is operated, and the temperature of hot water flowing through the second heat exchanger 12 is raised by the burner on the second heat exchanger 12 side. Thereby, the hot water sent out from the heating circulation pump 26 is supplied to the in-machine forward pipe 27, the thermal valve branch header 28, the forward pipe 82, the switching valve 84, the water pipe 83, the living room heat exchange unit 60, the return pipe 81, Circulation is performed so as to return to the suction side of the collective header 23, the in-machine return pipe 24, the latent heat exchanger 12 b of the second heat exchanger 12, the cistern 25, and the heating circulation pump 26. In addition, in order to increase the temperature of the hot water circulating in the heating circuit, a part of the hot water sent from the heating circulation pump 26 is heated by the sensible heat exchanger 12a of the second heat exchanger 12 and is supplied to the cistern 25. It flows to enter.

(3) Heating is performed by the heat exchange unit 60 in the living room and the heat exchange unit 60 in the bedroom, etc. without heating by the hot water mat 3 for floor heating. FIG. 10 shows the flow of hot water in the above case. Show. In the operation (2), when the heating load is too small in the operation (2) and the thermal efficiency of the hot water supply / heating heat source machine 10 is remarkably lowered, the heating load is increased to flow through the heat exchange unit 60 such as a bedroom to increase the heating load. This is done for effective use.

  The control unit 93 sets the switching valve 84 so that the hot water from the outgoing pipe 82 bypasses the hot water mat 3 for floor heating, closes the flow control valve 29, and closes the flow valve 82 on the outgoing pipe 82 side of the thermal valve branch header 28. The thermal valve on the side of the heating valve and the heating forward pipe 87 is opened, and the first three-way valve 41 of the path switching unit 40 is set to the first and third communication side, and the second three-way valve 42 is set to the first and third communication side. Then, the heating circulation pump 26 is operated, and the temperature of the hot water flowing through the second heat exchanger 12 is raised by the burner on the second heat exchanger 12 side. As a result, the hot water delivered from the heating circulation pump 26 enters the thermal valve branch header 28 from the in-machine forward pipe 27, and a part of the hot pipe 82, the switching valve 84, the water pipe 83, and the living room heat exchange unit. 60, return pipe 81, collective header 23, in-machine return pipe 24, latent heat exchanger 12b of second heat exchanger 12, cistern 25, and circulation to return to the suction side of heating circulation pump 26.

  The hot water branched by the thermal valve branch header 28 and flowing to the heating forward pipe 87 side passes through the second three-way valve 42 in the path switching unit 40, passes through the thermal forward pipe 85, the bedroom heat exchange unit 60, It flows through the heat exchange return pipe 86, further passes through the first three-way valve 41 in the path switching unit 40, and flows back from the heating return pipe 88 to the collective header 23. In order to increase the temperature of the hot water circulating in the heating circuit, a part of the hot water sent out from the heating circulation pump 26 is heated by the sensible heat exchanger 12a of the second heat exchanger 12 and is supplied to the cistern 25. It flows to enter.

(4) Recirculation of hot water in the heating circuit to perform preheating of air supply by the heat exchange unit 60 such as a bedroom FIG. 11 shows the flow of hot water in the above case. This operation is performed, for example, while sleeping in a bedroom.

  The control unit 93 closes the flow control valve 29, opens the thermal valve of the heating forward pipe 87 of the thermal valve branch header 28, and connects the first three-way valve 41 of the path switching unit 40 to the first and third communication sides, the second. The three-way valve 42 is set to the first third communication side, the heating circulation pump 26 is operated, and the temperature of hot water flowing through the second heat exchanger 12 is raised by the burner on the second heat exchanger 12 side. As a result, the hot water sent out from the heating circulation pump 26 passes from the in-machine forward pipe 27 to the thermal valve branch header 28, the heating forward pipe 87, and the second three-way valve 42 in the path switching unit 40, and then to the thermal forward pipe. 85, the heat exchange unit 60 in the bedroom, and the heat exchange return pipe 86, and further through the first three-way valve 41 in the path switching unit 40, enter the collective header 23 from the heating return pipe 88, and return to the in-flight return pipe 24, the second It circulates so as to return to the suction side of the latent heat exchanger 12b, the cistern 25, and the heating circulation pump 26 of the heat exchanger 12. In addition, in order to increase the temperature of the hot water circulating in the heating circuit, a part of the hot water sent from the heating circulation pump 26 is heated by the sensible heat exchanger 12a of the second heat exchanger 12 and is supplied to the cistern 25. It flows to enter.

(5) Recirculating bathtub water and preheating air supply with a heat exchange unit 60 such as a bedroom FIG. 12 shows the flow of hot water in the above case. This operation is performed not only for the purpose of heating the outside air to be introduced into the bedroom, but also as an operation related to a bathing function that forcibly lowers the temperature of the bathtub water in the bathtub 5.

  The controller 93 includes the first three-way valve 41, the second three-way valve 42. The third three-way valve 43 and the drain valve 44 are all set to the first second communication side, and the bath water circulation pump 45 is operated. Thereby, the bathtub water in the bathtub 5 passes from the bathtub 5 through the bath return pipe 89, the third three-way valve 43 in the path switching unit 40, the bath water circulation pump 45, and the second three-way valve 42, and further heat exchange. It circulates through the pipe 85, the heat exchange unit 60 in the bedroom, the heat exchange return pipe 86, the first three-way valve 41 in the path switching unit 40, and the drain valve 44 so as to return from the bath outlet pipe 90 to the bathtub 5.

(6) The bath water is circulated and air supply preheating is performed by the heat exchange unit 60 such as a bedroom, and the air supply preheating is also performed by the heat exchange unit 60 in the living room while performing the heating operation by the hot water mat 3 for floor heating. .

  This is to operate the operations (1) and (5) in parallel. It is also possible to operate the operations (2) and (5) in parallel.

  FIG. 13 shows the flow of hot water in the above case. The control unit 93 sets the switching valve 84 so that the outgoing pipe 82 of the heating circuit and the incoming side of the warm water mat 3 for floor heating communicate with each other, closes the flow control valve 29, and goes to the outgoing pipe 82 side of the thermal valve branch header 28. And the heating circulation pump 26 is operated, and the temperature of hot water flowing through the second heat exchanger 12 is raised by the burner on the second heat exchanger 12 side. Furthermore, the control unit 93 includes the first three-way valve 41, the second three-way valve 42. The third three-way valve 43 and the drain valve 44 are all set to the first second communication side, and the bath water circulation pump 45 is operated.

  As a result, the hot water sent out from the heating circulation pump 26 is converted into the in-machine forward pipe 27, the thermal valve branch header 28, the forward pipe 82, the hot water mat 3 for floor heating, the water pipe 83, the heat exchange unit 60 in the living room, The return pipe 81, the collective header 23, the in-machine return pipe 24, the latent heat exchanger 12 b of the second heat exchanger 12, the cistern 25, circulate so as to return to the suction side of the heating circulation pump 26. In addition, in order to increase the temperature of the hot water circulating in the heating circuit, a part of the hot water sent from the heating circulation pump 26 is heated by the sensible heat exchanger 12a of the second heat exchanger 12 and is supplied to the cistern 25. It flows to enter.

  Moreover, the bathtub water in the bathtub 5 passes through the bath return pipe 89 from the bathtub 5, the third three-way valve 43 in the path switching unit 40, the bath water circulation pump 45, the second three-way valve 42, and further the heat transfer pipe. 85. It circulates back from the bath outlet pipe 90 to the bathtub 5 through the heat exchange unit 60 in the bedroom, the heat exchange return pipe 86, the first three-way valve 41 in the path switching unit 40, and the drain valve 44.

  Next, drainage control for draining hot water in piping such as the heat exchange pipe 85, the heat exchange unit 60 on the bedroom side, and the heat exchange return pipe 86 will be described.

  For the preheating of the air supply using the heat exchange unit 60 such as a bedroom, the above-described operations (3) and (4) (FIGS. 10 and 11) performed using hot water in the heating circuit and the above-described operation performed using bathtub water There are operations (5) and (6) (FIGS. 12 and 13), and these operations can be switched.

  For example, when the operation of (4) using the hot water of the heating circuit (FIG. 11) is performed, if an execution request for the bathing function is received from a user taking a bath, the operation to (5) (FIG. 12) is performed. However, since the automatic operation of the bath has ended, the operation is switched to the operation (5) using bath water thereafter. At this time, it is not preferable that the hot water of the heating circuit that was flowing through the heat exchange unit 60 before switching flows into the bathtub 5. Then, the 1st drainage control which replaces with hot water in the circulation path containing the heat exchange unit 60 (hot water by the side of a heating circuit) to bathtub water is drained outside.

  FIG. 14 shows the flow of hot water when performing the first drainage control. The controller 93 switches from the operation (4) shown in FIG. 11 to the operation (5) shown in FIG. 12 after performing the first drainage control shown in FIG. 14 for a predetermined time. In the first drainage control, the control unit 93 includes the first three-way valve 41, the second three-way valve 42. After the third three-way valve 43 is set to the first second communication side and the drain valve 44 is set to the first third communication state (drainage side), the hot water circulation pump 45 is operated for a predetermined time.

  Thereby, the bathtub water in the bathtub 5 passes from the bathtub 5 through the bath return pipe 89, the third three-way valve 43 in the path switching unit 40, the bath water circulation pump 45, and the second three-way valve 42, and further heat exchange. The water is discharged to the drain through the pipe 85, the heat exchange unit 60 in the bedroom, the heat exchange return pipe 86, the first three-way valve 41 in the path switching unit 40, and the drain valve 44. By this operation, the hot water of the heating circuit that has been in the above path is drained and replaced with bathtub water. The first drainage control is performed until at least the bath water starts to be drained from the drain valve 44. What is necessary is just to calculate the time required for drainage from the path length and the delivery amount of the hot water circulation pump 45.

  After performing the first drainage control, the controller 93 switches the drainage valve 44 to the first second communication state. Thereby, supply air preheating by the operation of (5) is started. Thus, from the path of the operation (4), the first three-way valve 41, the second three-way valve 42. The first predetermined time when operating the hot water circulation pump 45 after switching the third three-way valve 43 to the first second communication side is set to the drain side so that the hot water of the heating circuit is added to the bathtub 5. Is prevented from flowing in.

  Next, the second drainage control will be described. The control unit 93 performs the second drainage control when the supply air preheating is switched from the operation (5) shown in FIG. 12 to the operation (4) shown in FIG. For example, when operating the supply air preheating at noon on the day after the supply air preheating by the operation of (5) using the remaining hot water after the automatic operation of the bath is completed, there is no hot water in the bathtub 5, The supply air preheating is performed by the operation (4) using the hot water of the heating circuit. In this case, since the bathtub water circulated by the supply air preheating by the operation (5) last night remains in the heat exchange unit 60, the heat exchange pipe 85 and the heat exchange return pipe 86 before and after the heat exchange unit 60, When the operation is started, the bath water remaining in the pipe flows into the heating circuit, which is not preferable. Therefore, the second drainage control is performed, and the bath water remaining in the pipe is drained from the drain outlet, and then the operation is switched to the operation (4).

  FIG. 15 shows the flow of hot water when performing the second drainage control. The controller 93 closes the flow control valve 29, opens the thermal valve on the heating forward pipe 87 side of the thermal valve branch header 28, and connects the first three-way valve 41 of the path switching unit 40 to the first and second communication sides, the first. 2 The three-way valve 42 is set to the first and third communication side, and the drain valve 44 is set to the first and third communication side (drainage side), and the heating circulation pump 26 is operated.

  As a result, the water in the cistern 25 is heated by the circulation pump 26 for heating, the in-machine forward pipe 27, the thermal valve branch header 28, the heating forward pipe 87, the second three-way valve 42 in the path switching unit 40, the thermal forward pipe 85, The water is discharged to the drain through the bedroom-side heat exchange unit 60, the heat exchange return pipe 86, the first three-way valve 41 and the drain valve 44 in the path switching unit 40. Thereby, the bath water remaining in the heat exchange unit 60, the heat exchange return pipe 86, the heating forward pipe 87, and the like is replaced with water from the cistern 25. The water supply is automatically replenished to the cis turn 25 so that the water level in the cis turn 25 becomes constant.

  Next, the third drainage control will be described. When the preheating of the air supply using the heat exchange unit 60 in the bedroom is used for the first time in winter, the bath water used in the air supply preheating last year or the warm water of the heating circuit is the water flow related to the heat exchange unit 60 and the air supply preheating. It remains on the route. Therefore, in the third drainage control, all the water passages related to the supply air preheating are washed with clean water supply. The controller 93 executes the third drainage control before the first charge preheating of the season.

  FIG. 16 shows the flow of hot water when performing the third drainage control. In 3rd drainage control, the water pouring function to the bathtub 5 which the hot water supply heating heat source machine 10 has is utilized. The controller 93 sets all of the first three-way valve 41, the second three-way valve 42, the third three-way valve 43, and the drain valve 44 of the path switching unit 40 to the first second communication side, and opens the pouring valve 37. Add water. As a result, the water supplied from the water supply source flows into the follow-up pipe 35 through the first heat exchanger 11, the bypass pipe 17, the pouring pipe 36, and the pouring valve 37. A part of the water that has flowed into the retreating pipe 35 goes to the eighth connection port of the path switching unit 40 through the retreating pipe 35 and branches after passing through the second check valve 47, one of which is a drain valve 44. Then, it flows into the bathtub 5 through the bath outlet pipe 90. The other branched side is directed to the second connection port of the first three-way valve 41, exits from the first connection port of the first three-way valve 41, and passes through the heat exchange return pipe 86, the heat exchange unit 60, and the heat exchange pipe 85. After flowing in the reverse direction when air supply preheating is performed, the bath returns from the bath return pipe 89 to the bathtub 5 via the second three-way valve 42, the bath water circulation pump 45, and the third three-way valve 43 in the path switching unit 40. Flows out. The clogging or deposits of the heat exchange unit 60 can be removed by flowing the water supply in the direction opposite to that when the air supply preheating is performed on the heat exchange unit 60.

  Another part of the water supplied from the pouring pipe 36 to the retreating pipe 35 flows to the secondary water pipe side of the reheating water-water heat exchanger 30 and passes through the bath flow switch 33 and the bath circulation pump 34. The recirculation return pipe 32 reaches the sixth connection port of the path switching unit 40, and further passes through the first check valve 46 in the path switching unit 40, and then merges with the water supply from the second three-way valve 42 side. Then, it flows to the bath hot water circulation pump 45 side, and flows out to the bathtub 5 through the bath hot water circulation pump 45, the third three-way valve 43, and the bath return pipe 89.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  The heat exchange unit 60 shown in the embodiment is an example. The fin tube type which does not use the flat tube 63 may be sufficient. In addition, the heat exchanger used for the air supply preheating is preferably inserted into the air supply duct 103, but may be installed at the air supply port, for example, before the inlet on the outdoor side of the air supply duct. It may be attached to.

  The piping path and the internal structure of the path switching unit 40 are not limited to those shown in the embodiment. Further, the present invention may be the route switching unit 40 alone in the heating system 8, or the heating system 8 may be configured by combining the route switching unit 40 with the existing hot water supply / heating heat source machine 10 and the like.

3. Heating radiator (hot water mat for floor heating)
DESCRIPTION OF SYMBOLS 5 ... Bathtub 8 ... Heating system 10 ... Hot water supply heating heat source machine 11 ... 1st heat exchanger 11a ... Sensible heat exchanger 11b of 1st heat exchanger 11b ... Latent heat heat exchanger of 1st heat exchanger 12 ... 2nd heat Exchanger 12a ... Sensible heat exchanger 12b ... Second heat exchanger latent heat exchanger 13 ... Water supply pipe 14 ... Hot water supply pipe 15 ... Water quantity sensor 16 ... Water quantity servo 17 ... Bypass pipe 18 ... Bypass Servo 21 ... Heat exchange temperature sensor 22 ... Hot water supply temperature sensor 23 ... Collective header 24 ... In-machine return pipe 25 ... Systurn 26 ... Heating circulation pump 27 ... In-machine forward pipe 28 ... Thermal valve branch header 29 ... Flow control valve 30 ... Follow-up Water-to-water heat exchanger 31 ... Return pipe 32 ... Return return pipe 33 ... Bath flow switch 34 ... Bath circulation pump 35 ... Refreshing pipe 36 ... Pouring pipe 37 ... Pouring valve 40 ... Route switching unit 4 DESCRIPTION OF SYMBOLS 1 ... First three-way valve 42 ... Second three-way valve 43 ... Third three-way valve 44 ... Drain valve 45 ... Bath water circulation pump 46 ... First check valve 47 ... Second check valve 60 ... Heat exchange unit 61 ... Heat Exchanger 62 ... Partition plate 63 ... Flat tube 63a ... Penetration type flat tube 63b ... Single surface type flat tube 63c ... Single-sided flat tube 64 ... Connection part 65 ... Inlet 66 ... Outlet 81 ... Return pipe 82 ... Outward pipe DESCRIPTION OF SYMBOLS 83 ... Water pipe 84 ... Switching valve 85 ... Heat exchange pipe 86 ... Heat exchange return pipe 87 ... Heating return pipe 88 ... Heating return pipe 89 ... Bath return pipe 90 ... Bath forward pipe 93 ... Control part 97 ... Remote control 101 ... Ventilation fan 102 ... Suction port 103 ... Air supply port (air supply duct)
104 ... Exhaust port 108 ... Air supply port cover 110 ... Heat exchanger

Claims (7)

A heat exchanger installed at an air intake port for taking outside air indoors;
A heat transfer pipe from the bathtub to the entrance of the heat exchanger;
A heat exchanger return pipe from the outlet side of the heat exchanger to the bathtub;
A circulation pump that circulates bathtub water in the bathtub from the bathtub to the circulation path that returns to the bathtub through the heat exchange pipe, the heat exchanger, and the heat exchange return pipe;
A heating circulation pump that circulates the heat medium fluid in the heating circuit; and a heat source unit that includes a heat source unit that heats the heat medium fluid in the heating circuit;
A switching unit that switches the path between a second connection state in which the heat exchanger is disconnected from the circulation path and connected to the heating circuit, and a first connection state in which the heat exchanger is inserted in the circulation path;
Provided in the heat return pipe on the bathtub side from a location downstream of the circulation pump and where the heat exchanger is disconnected in the second connection state, and the heat return pipe on the heat exchanger side is connected to the bathtub side A communication valve connected to the heat exchange return pipe, a drain valve for switching the heat exchange return pipe on the heat exchanger side to a drainage side connected to a predetermined drainage destination,
A heating system characterized by comprising: The first drainage control for setting the drainage valve to the drainage side is performed for the first predetermined time for operating the circulation pump after switching the switching unit from the second connection state to the first connection state. The heating system according to claim 1. The switching unit is a third connection state in which the inlet side of the heat exchanger is disconnected from the circulation path and connected to the heating circuit, and the outlet side of the heat exchanger is connected to the heat return pipe of the circulation path. Can be switched to
Performing the second drainage control in which the switching unit is set to the third connection state and the drainage valve is set to the drainage side, and the heating medium fluid is sent from the heating circuit toward the heat exchanger. The heating system according to claim 1 or 2, characterized by the above. The heat source machine has a reheating function of a bath that circulates bathtub water in a reheating path and raises the temperature, and a water injection function that pours water into the bathtub through the reheating path,
The switching unit can further switch between a fourth connection state in which the bathtub is disconnected from the circulation path and connected to the reheating path, and a fifth connection state in which the reheating path is connected to the circulation path,
The switching unit is set to the fifth connection state, the drain valve is set to the communication side, and third drainage control is performed to inject water into the bathtub through the reheating path and the circulation path. The heating system according to any one of claims 1 to 3. The switching unit is
The heat exchanger tube is inserted in the middle of the heat exchanger tube, and the heat exchanger tube on the heat exchanger side is connected to the heat exchanger tube on the bathtub side, or the heat exchanger tube on the heat exchanger side is connected to the heating circuit. A first switching valve that switches whether to connect to the return pipe;
The heat exchanger tube is inserted in the middle of the heat exchanger tube, and the heat exchanger side heat exchanger tube is connected to the bathtub side heat exchanger tube, or the heat exchanger side heat exchanger tube is connected to the heating circuit. A second switching valve for switching whether to connect to the outgoing pipe of
The second switching valve is inserted in the middle of the thermal exchange pipe on the bathtub side, and the thermal exchange pipe on the bathtub side is connected to the thermal exchange pipe on the second switching valve side, or A third switching valve for switching whether to connect the heat transfer pipe on the bathtub side to the return pipe of the reheating path of the bath;
Have
The circulation pump is inserted in the heat transfer pipe between the second switching valve and the third switching valve, and feeds water from the third switching valve side to the second switching valve side,
The drain valve is provided in the heat exchange return pipe on the bathtub side from the first switching valve,
An outgoing pipe of the reheating path is connected to a heat exchange return pipe between the first switching valve and the drain valve;
The switching unit further includes
A first check that connects the return pipe of the reheating path and the outlet side of the circulation pump with a pipe and prevents a flow from the outlet side of the circulation pump to the return pipe side of the reheating path in the middle of the pipe. A valve,
A second check valve provided in the middle of the outgoing pipe of the reheating path;
It has these. The heating system as described in any one of Claims 1 thru | or 4 characterized by the above-mentioned. In the heat exchanger, a plurality of hollow flat plate-like flat tubes are laminated at intervals, and adjacent flat tubes are connected to each other on one end side and the other end side in a laminating direction by a connection portion, The heating system according to any one of claims 1 to 5, wherein the fluid that has flowed into the inflow port is configured to flow out of the outflow port through each flat tube and the connecting portion.   A path switching unit including the switching unit, the drain valve, and the circulation pump in the heating system according to any one of claims 1 to 6.