JP2016173219A - Heat source device, heat exchange method and heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize hot water supply characteristics and simplify a circuit for heating medium circulation.SOLUTION: A heat source device includes: a heat source (4); a first circulation passage (8-1) for circulating a heating medium (M); a second circulation passage (8-2) for circulating bathtub water (BW); a first heat exchanger (6-1) having a heating medium heat exchange section (6-11) for exchanging heat between the heat source and the heating medium and a bathtub water heat exchange section (6-12) for exchanging heat between the heat source and the bathtub water; and a second heat exchanger (6-2) for exchanging heat between the heating medium heated by the heating medium heat exchange section (6-11) and supplied water to deliver hot water.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a heat source technology for performing hot water supply, bath water replenishment, heating and the like using combustion heat of fuel gas as a heat source.

  In a conventional heat source device having a hot water supply function, a reheating function, and a heating function, a heating heat exchanger is installed separately from the hot water supply heat exchanger as a heat exchanger heated by combustion heat, and a heating heat medium and heat A heat exchanger for replacement is provided. Further, without using a heat exchanger for hot water supply heated by combustion heat, a heat medium heated by combustion heat is used for a heating function, and heat exchange with feed water or heat exchange with bathtub water (for example, patents) Document 1) is known.

In heat exchange between combustion heat and heat medium, one heat exchanger is equipped with a heat exchange section that exchanges heat between the combustion heat and the heating medium, and a bathtub water heat exchange section that exchanges heat between the combustion heat and the bath water. Are known (for example, Patent Document 2, Patent Document 3).

JP 2007-187419 A JP 09-318151 A JP 2006-090592 A

  For example, if a heating medium is heated without providing a heat exchanger for hot water supply that is heated by combustion heat, the combustion heating unit is made compact and the combustion heat of the burner and the heat medium are exchanged, and the heat of the heating medium Heat exchange between water and feed water can maintain the heat medium at a constant temperature, for example 80 [deg.] C., and the heat of the heat medium can be exchanged with the feed water, thus avoiding the effects of temperature changes in combustion heat. There is an advantage that the hot water characteristics are stabilized.

  When the heat of the heat medium is used for reheating the bath water, there is a problem that a heat exchanger for reheating must be installed in the heat medium circuit separately from the heat exchanger for heating the heat medium.

  In addition, if one heat exchanger is equipped with a heat exchange part that exchanges heat between the combustion heat and the heating medium and a bathtub water heat exchange part that exchanges heat with the bathtub water, Although it is necessary to circulate the heat medium, there is a problem that the heat medium is circulated to a heat radiation load for heating connected to the heat medium circuit. In order to enable the heat medium circulation separately from the heat radiation load, there is a problem that a circulation path such as a bypass path is necessary to avoid the heat medium circulation to the heat radiation load.

Accordingly, in view of the above problems, an object of the present invention is to stabilize a hot water supply characteristic and simplify a circuit for circulating a heat medium.

  In order to achieve the above object, according to one aspect of the heat source device of the present invention, a heat source, a first circulation path for circulating a heat medium, a second circulation path for circulating bath water, and heat of the heat source A heat exchanger that exchanges heat with the heat medium, a first heat exchanger that includes a bath water heat exchanger that exchanges heat between the heat source and the bath water, and heating with the heat medium heat exchanger What is necessary is just to provide the 2nd heat exchanger which heat-exchanges the heat | fever of the said heat medium, and feed water, and takes out hot water.

  In the heat source device, the first circulation path may include a return path that passes the second heat exchanger and returns the heat medium to the first heat exchanger.

  In the heat source device, a distribution valve that distributes the heat medium after heat exchange in the heat medium heat exchange unit to at least the first and second paths, the heat medium distributed by the distribution valve, and the heat medium heat You may provide the mixing valve which mixes the said heat medium before heat exchange in heat exchange in an exchange part.

  In the heat source device, the first heat exchanger includes a plurality of primary heat exchangers that directly receive heat of the heat source, and at least one secondary heat exchanger that receives heat after heat exchange of the primary heat exchanger. The heat medium heat exchange section includes at least the primary heat exchanger or includes the primary heat exchanger and the secondary heat exchanger, and the bathtub water heat exchange section includes at least the primary heat exchanger. May include.

  In the heat source device, the first path may lead the heat medium to the second heat exchanger, and the second path may lead the heat medium to the mixing valve.

  The heat source device may include a first heat medium circuit that guides the heat medium from the first path or the second path to a high-temperature heat radiation load.

  The heat source device may include a second heat medium circuit that guides the heat medium obtained by the mixing valve to a low-temperature heat radiation load.

  In the heat source device, the first heat exchanger is a tapping heat exchange unit that exchanges heat after heat exchange of the first heat exchanger with water supplied before heat exchange of the second heat exchanger. May be provided.

  In order to achieve the above object, according to one aspect of the heat exchange method of the present invention, when hot water is supplied, a heat medium is circulated through the first circulation path to exchange heat between the heat medium and the heat source, and A step of exchanging the heat of the medium with the water supply and taking out the hot water; and when reheating the bathtub water, circulating the bathtub water in the second circulation path, exchanging heat between the bathtub water and the heat of the heat source, And a step of heating the bath water.

  In order to achieve the above object, according to one aspect of the heat exchanger of the present invention, a heat medium heat exchange unit that receives the heat medium from the first circulation path and exchanges heat between the heat medium and the heat source; What is necessary is just to provide integrally the bathtub water heat exchange part which receives the bathtub water for chasing from a 2nd circulation path, and heat-exchanges this bathtub water and the heat of a heat source.

  The heat exchanger may further include a feed water heat exchanging unit that receives feed water before heat exchange with the heat of the heat medium and exchanges heat between the feed water and the heat of the heat source.

In the heat exchanger, the feed water heat exchange section exchanges heat between the combustion exhaust after heat exchange with the heat medium and the feed water.

  According to the heat source device or the heat exchange method of the present invention, any of the following effects can be obtained.

  (1) Since the heat exchanger that exchanges heat between the heat source such as combustion heat and the heat medium is equipped with a bath water heat exchanger that exchanges heat between the bath water and the heat source, the heat of the heat medium and the bath water A so-called liquid-to-liquid heat exchanger for exchanging heat can be omitted.

  (2) Since the bathtub water can be heated by the heat from the heat source, the bathtub water can be heated separately from the hot water supply heating, and the heating of the bathtub water can be accelerated.

  (3) Since the heating medium circulation path can be configured separately from the heating medium heating circuit, it is not necessary to provide a heating medium circulation path for avoiding the heating load on the heating circuit side, and the heating medium circulation or the heating circuit can be simplified.

(4) When bathing, the heating medium can be circulated in the circulation path regardless of the heating circuit, and measures on the heating circuit side and boiling of the heating medium can be prevented.

It is a figure which shows the heat-source apparatus which concerns on 1st Embodiment. It is a figure which shows the hot water supply operation | movement of a heat source device, and a chasing operation | movement. It is a figure which shows the heat-source apparatus which concerns on 2nd Embodiment. It is a figure which shows the hot water supply operation | movement of a heat-source apparatus. It is a figure which shows the chasing operation | movement of a heat-source apparatus. It is a figure which shows the heating operation of a heat-source apparatus. It is a figure which shows the hot water supply, reheating, and heating apparatus which concern on an Example. It is a figure which shows a control system. It is a flowchart which shows circulation pump control. It is a flowchart which shows burner combustion control. It is a flowchart which shows hot water supply control. It is a figure which shows the hot_water | molten_metal supply operation | movement of a hot-water supply, reheating, and heating apparatus. It is a figure which shows the chasing operation | movement of a hot water supply, chasing, and heating apparatus. It is a figure which shows the heating operation | movement of a hot-water supply, reheating, and heating apparatus.

[First Embodiment]

  FIG. 1 shows an example of a heat source device 2-1 according to the first embodiment. The heat source device 2-1 includes a heat source 4, a first heat exchanger 6-1 and a second heat exchanger 6-2.

  The heat source 4 is, for example, a burner, which burns the fuel gas G and generates combustion exhaust EG as an example of combustion heat.

  The heat exchanger 6-1 is an example of the heat exchanger of the present invention, and includes a heat medium heat exchanging unit 6-11 and a bath water heat exchanging unit 6-12. A first circulation path 8-1 is connected to the heat medium heat exchanger 6-11, and the heat medium M is circulated through the circulation path 8-1. In the heat medium heat exchanging unit 6-11, the heat of the combustion exhaust gas EG and the heat medium M are heat-exchanged, and the heat medium M is heated to a constant temperature T1, for example, T1 = 80 [° C.]. The circulation path 8-1 includes a return path 10 for returning the heat medium M guided to the heat exchanger 6-2 from the heat exchanger 6-2 to the heat medium heat exchanging unit 6-11.

  The bathtub water heat exchanger 6-12 is connected to the second circulation path 8-2, and the bathtub 12 is connected to the circulation path 8-2. Bath water BW is circulated through this circulation path 8-2. In the bathtub water heat exchanger 6-12, the heat of the combustion exhaust EG and the bathtub water BW are exchanged, and the bathtub water BW is heated to, for example, T2 = 42 [° C.] as a temperature T2 set by the bather.

  The heat exchanger 6-2 is, for example, a liquid-liquid heat exchanger, and for example, a plate heat exchanger may be used. In this heat exchanger 6-2, the water supply W such as clean water from the water supply passage 14-1 is received, and the hot water HW is discharged from the hot water supply passage 14-2 by exchanging heat between the water supply W and the heat medium M.

  In addition to the primary heat exchanger that exchanges sensible heat on the upstream side of the combustion exhaust gas EG, either or both of the heat medium heat exchange unit 6-11 and the bath water heat exchange unit 6-12 include a primary heat exchanger. For example, a secondary heat exchanger for exchanging latent heat may be provided on the downstream side of the combustion exhaust EG after heat exchange.

  The water supply path 14-1 is provided with a secondary heat exchanger installed in the heat exchanger 6-1, for example, downstream combustion exhaust generated in the heat source 4 before heat exchange by the heat exchanger 6-2. EG and water supply W may be heat exchanged.

  A) Hot water supply operation

  FIG. 2A shows a hot water supply operation. At the time of hot water supply, the water supply W is supplied to the heat exchanger 6-2, and the heat medium M is circulated through the circulation path 8-1 correspondingly. At this time, for example, the heat medium M is heated by heat exchange between the combustion exhaust EG and the heat medium M generated in the heat source 4. This heat medium M performs heat exchange with the feed water W in the heat exchanger 6-2, and discharges the hot water HW from the hot water supply path 14-2. During this hot water supply, the bathtub water BW does not circulate in the circulation path 8-2.

  B) Pursuit operation

  B of FIG. 2 has shown the chasing operation of the bath water BW. When bathing the bathtub water BW, the bathtub water BW is circulated through the circulation path 8-2. At this time, for example, the combustion exhaust EG and the bathtub water BW generated in the heat source 4 are heat-exchanged and heated by the bathtub water heat exchanger 6-12.

  At this time, in the heat exchanger 6-1, the heat generated in the heat source 4 is applied to the heat medium heat exchanging unit 6-11, so heat exchange between the combustion exhaust EG and the heat medium M is performed. Therefore, the heating medium M is circulated in the circulation path 8-1 to avoid partial boiling.

<Effect of the first embodiment>

  (1) Since the bath water heat exchanging section 6-12 is provided in the heat exchanger 6-1, the bath water BW can be heated by the heat of the heat source 4, and so-called liquid for heat exchange between the heat medium M and the bath water BW. Heat exchangers can be omitted. The liquid heat exchanger is only a hot water supply heat exchanger 6-2, and the number of heat exchangers installed in the heat source device 2-1 can be reduced.

  (2) Since the bathtub water BW can be heated by the heat from the heat source 4, that is, the bathtub water BW can be heated separately from the hot water supply heating, the heating of the bathtub water BW can be accelerated.

  (3) Since the heat medium M after the heat exchange by the heat exchanger 6-2 is returned to the heat transfer unit 6-11 through the return path 10 in the circulation path 8-1, the heat medium M is added when the bathtub is replenished. Can be circulated to the circulation path 8-1 regardless of the circulation of the bathtub water BW in the circulation path 8-2 and the heating load side, and can prevent the heating circuit side measures and the boiling of the heat medium.

[Second Embodiment]

  FIG. 3 shows an example of the heat source device 2-2 according to the second embodiment. In FIG. 3, the same parts as those in FIG. The heat source device 2-2 includes a burner 20 as an example of the heat source 4 described above, and the burner 20 is installed in the combustion chamber 22. The burner 20 is supplied with a fuel gas G as an example of fuel. An air supply fan 24 is installed in the combustion chamber 22 as an example of an air supply unit, and combustion air is supplied from the air supply fan 24 to the combustion chamber 22. The combustion exhaust EG generated in the burner 20 by the combustion of the fuel gas G flows into the exhaust hole 26 on the downstream side with the burner 20 as the upstream side.

  The combustion chamber 22 includes a first heat exchanger 6-1, and the heat exchanger 6-1 includes a first heat medium heat exchange unit 6-111 and a second heat medium heat exchange unit 6-112. The bathtub water heat exchange unit 6-12 and the hot water supply heat exchange unit 6-13 are provided. The heat medium heat exchanging unit 6-111 and the bath water heat exchanging unit 6-12 that recover the heat of the combustion exhaust gas EG on the upstream side are the primary heat exchangers described above, and are used for the heat medium heat exchanging unit 6-112 and the hot water supply. The heat exchanger 6-13 is a secondary heat exchanger that recovers the heat of the combustion exhaust EG on the downstream side after the heat exchange by the primary heat exchanger.

  In the circulation path 8-1 for circulating the heat medium M, the heat medium heat exchange units 6-111 and 6-112, the circulation pump 28-1, the tank 30, the heat exchanger 6-2, the distribution valve 32-1, and the mixing A valve 32-2, a high temperature heating load 34-1 and a low temperature heating load 34-2 are connected.

  The tank 30 is driven by the circulation pump 28-1, and the low-temperature heat from any one or combination of the heat exchanger 6-2, the high-temperature heating load 34-1 and the low-temperature heating load 34-2 is passed through the circulation path 8-1. The medium M returns. The heat medium M from the tank 30 is preheated by the heat medium heat exchanging unit 6-112, then branched by the branching unit 36-1, circulated to the heat medium heat exchanging unit 6-111, heated, and then distributed. Guided to valve 32-1. In the distribution valve 32-1, the high-temperature heat medium M is distributed to the heat exchanger 6-2 side and the branch part 36-2 side.

  The heat medium M circulating in the heat exchanger 6-2 is used for heat exchange with the feed water W side. The heat transfer medium M that passes through the heat exchanger 6-2 and has a low temperature returns to the tank 30 through the return path 10 that is a part of the circulation path 8-1. In other words, it returns to the heat exchanger 6-1 by the return path 10 formed separately from the heating circuits 8-11 and 8-12 of the high-temperature heating load 34-1 and the low-temperature heating load 34-2.

  In the branch part 36-2, the high-temperature heat medium M is distributed to the mixing valve 32-2 and the heating circuit 8-11 side. The heat medium M distributed to the heating circuit 8-11 side is radiated by the high-temperature heating load 34-1 and used for heating. Thereby, the heat medium M whose temperature has been lowered is returned to the tank 30 and stored.

  The heat medium M distributed to the mixing valve 32-2 side is mixed with the heat medium M preheated by the heat medium heat exchanging unit 6-112 having a lower temperature, and the heat medium M having the mixed temperature is heated by a heating circuit. Cycle to 8-12. In the heating circuit 8-12, the circulating heat medium M is radiated by the low-temperature heating load 34-2 and used for heating. Thereby, the heat medium M whose temperature has been lowered is returned to the tank 30 and stored.

  The bathtub water heat exchanger 6-12, the circulation pump 28-2, and the bathtub 12 are connected to the circulation path 8-2. By driving the circulation pump 28-2, the bathtub water BW is circulated from the return pipe 8-21 to the bathtub water heat exchange section 6-12, and from this bathtub water heat exchange section 6-12 to the bathtub 12 by the forward pipe 8-22. Returned.

  In this embodiment, a hot water supply heat exchanging section 6-13 is connected to the water supply path 14-1. Accordingly, the water supply W is preheated by the hot water supply heat exchanging unit 6-13, and then heat exchange with the heat medium M is performed by the heat exchanger 6-2. Thereby, the hot water W is supplied as hot water HW.

<Hot-water supply operation>

  FIG. 4 shows the hot water supply operation of the heat source device 2-2. In this hot water supply operation, the heat medium M is circulated using the return path 10 of the circulation path 8-1, and heat exchange between the heat medium M and the feed water W is performed.

<Pursuit operation>

  FIG. 5 shows the chasing operation of the heat source device 2-2. In this chasing operation, the circulation pump 28-2 is driven and the bathtub water BW is circulated through the circulation path 8-2. In the heat exchange between the bath water BW and the combustion exhaust EG, in order to avoid boiling of the heat transfer medium M due to the heat exchange between the heat transfer medium M and the combustion exhaust EG, the circulation pump 28-1 is driven and the return of the circulation path 8-1. The heating medium M is circulated using the path 10.

<Heating operation>

  FIG. 6 shows the heating operation of the heat source device 2-2. In this heating operation, the heat medium M is circulated through the circulation path 8-1, the high-temperature heat medium M distributed by the distribution valve 32-1 is flowed to the heating circuit 8-11, and is circulated to the high-temperature heating load 34-1. . Further, the high-temperature heat medium M and the low-temperature heat medium M distributed by the distribution valve 32-1 are mixed by the mixing valve 32-2, and flowed to the heating circuit 8-12 and circulated to the low-temperature heating load 34-2. .

<Effects of Second Embodiment>

  (1) The heat exchanger 6-1 integrates the heat medium heat exchange units 6-111 and 6-112, the bath water heat exchange unit 6-12 and the hot water supply heat exchange unit 6-13 to form a single heat exchange. The heat source device 2-2 can be downsized together with a compact heat exchanger.

  (2) In the heat exchanger 6-1, the combustion exhaust EG of the single burner 20 is applied to a plurality of heat exchanging portions, so that the combustion heat can be used efficiently.

  (3) Conventionally, the liquid-to-liquid heat exchanger that has been used for heating the bath water BW can be omitted, and the cost and the size can be reduced.

  (4) Since the return path 10 is provided in the circulation path 8-1 of the heating medium M and the heating medium M is circulated through the feedback path 10, the heating medium from the heating circuits 8-11 and 8-12 to the heating load. Circulation can be avoided and heat dissipation of the heat medium M can be avoided.

  (5) The distribution valve 32-1 and the mixing valve 32-2 can be arranged at adjacent positions, and can be configured as a single valve unit 320, reducing the number of components and simplifying or simplifying the circulation path 8-1 of the heat medium M. Can be achieved.

  (6) In the heat exchanger 6-2, heat exchange between the heat medium M and the feed water W can be performed. For example, heat exchange between the heat medium M and the feed water W at 80 [° C.] can be performed. The characteristics can be stabilized.

(7) The bath water heat exchange section 6-12 included in the heat exchanger 6-1 can directly receive the combustion heat from the combustion exhaust EG for tracking the bath water BW. Can be increased. That is, the bathtub water BW can be heated quickly.

  FIG. 7 shows a hot water supply / reheating / heating device 40 which is an embodiment of the heat source devices 2-1, 2-2. In the hot water supply / reheating / heating device 40, the same parts as those in FIG.

  The hot water supply / chasing / heating apparatus 40 includes an apparatus housing 42, which is attached to a wall member of a house. The apparatus housing 42 is provided with the above-described circulation paths 8-1 and 8-2. The return path 10, which is a part of the circulation path 8-1, is installed in the apparatus housing 42. That is, the heat medium M uses the return path 10 and the heat exchanger separately from the circulation path of the heat medium M such as the high-temperature heating load 34-1, the low-temperature heating load 34-2, and the heating circuits 8-11 and 8-12. Returned to the tank 30 from 6-2.

  The heat medium heat exchanging unit 6-111 and the bath water heat exchanging unit 6-12 are integrally configured heat exchange pipes, and a plurality of heat absorbing fins 44 are attached in common.

  Fuel gas G is supplied to the burner 20 from a fuel supply pipe 43. A fuel control valve 32-4 is installed on the burner 20 side, and the supply and supply amount of the fuel gas G to the burner 20 are controlled.

  The heat-medium heat exchanging unit 6-112 and the hot water supply heat exchanging unit 6-13 are secondary heat exchangers that collect downstream combustion exhaust EG, and generate a large amount of drain D. The drain D is received by the drain receiver 46, stored in the drain tank 48, and discharged according to the storage amount.

  A bypass passage 14-3 is provided in the water supply passage 14-1 and the hot water supply passage 14-2, and a mixing valve 32-3 is provided on the hot water supply passage 14-2 side. A temperature sensor 50-1, a water supply amount sensor 52 are provided on the side of the water supply path 14-1, and temperature sensors 50-2, 50-3 are provided on the side of the hot water supply path 14-2. The temperature sensor 50-1 detects the temperature of the feed water W, and the temperature sensor 50-2 detects the temperature of the hot water HW immediately after the heat exchange of the heat exchanger 6-2. Further, the temperature sensor 50-3 detects the temperature of the hot water HW that has passed through the mixing valve 32-3. Therefore, when starting the hot water supply, the water supply amount, the water supply temperature, the hot water temperature immediately after the heat exchange are referred to, and after the hot water supply is started, the mixing valve 32-3 is controlled by referring to the hot water temperature, and immediately after the heat exchange. The mixing ratio of the feed water W to the hot water HW is adjusted. Thereby, the hot water HW controlled to preset temperature can be discharged.

  An electrical board 54 is provided. The electrical board 54 receives a commercial AC power supply by a power supply unit 56 and is supplied with a power output. The electrical board 54 is provided with a hot water supply / reheating / heating control unit 58 (FIG. 8), and remote control devices 60-1, 60-2, 60-3 are connected thereto.

<Control system>

  FIG. 8 shows an example of the hot water supply / reheating / heating control unit 58. In the configuration shown in FIG. 8, functional units necessary for describing the functions as the embodiment are described, and the functional units are not limited to such functional units.

  The hot water supply / reheating / heating control unit 58 and the remote control devices 60-1, 60-2, 60-3 are configured by a computer and realize a control mode described later by information processing. The processor 62 executes a program in the memory unit 64 to execute information processing necessary for hot water supply / reheating / heating control, data storage, and the like.

  The memory unit 64 includes a recording medium such as a ROM (Read-Only Memory) and a RAM (Random-Access Memory), and stores a program for executing information processing necessary for control. In addition to ROM, non-volatile recording media such as EEPROM (Electrically Erasable Programmable Read-Only Memory) may be used. The RAM constitutes a work area for information processing.

  The system communication unit 66 is controlled by the processor 62, cooperates with the remote control devices 60-1, 60-2, 60-3 by wire or wirelessly, and executes exchange of information with these.

  The input / output unit (I / O) 68 extracts input information used for information processing of the processor 62 and a control output as a processing result. Circulation pumps 28-1, 28-2, temperature sensors 50-1, 50-2, 50-3, a fuel control valve 32-4, and the like are connected to the I / O 68.

<Control mode of hot water supply / reheating / heating device 40>

  The hot water supply / reheating / heating device 40 includes a hot water supply operation, a reheating operation, a heating operation, and the like. These operations include pump rotation speed control (FIG. 9), burner combustion control (FIG. 10), and hot water supply control ( Fig. 11), bathtub pouring control and the like are included.

<Pump speed control>

  FIG. 9 shows a processing procedure for pump rotation speed control. This processing procedure is an example of the heat exchange method of the present invention. In this pump rotation speed control, it is determined whether or not it is a chasing single operation (S101). If it is a chasing single operation (YES in S101), the circulation pump 28-1 is driven at a rotational speed necessary for preventing boiling of the heating medium M during chasing (S102).

  If it is not a chasing independent operation (NO in S101), it is determined whether it is a hot water solitary operation or simultaneous operation of hot water supply and chasing (S103).

  In the case of a single hot water supply operation or a simultaneous operation of hot water supply and reheating, the heat medium M is set to a predetermined temperature T1 according to the amount of hot water supplied, for example, the heat medium M is set to the second heat exchanger 6-2 at T1 = 80 ° C. The circulation pump 28-1 is driven at the number of revolutions required for the amount supplied to (S104).

  If one of the hot water supply operation and the chasing operation is other than both, the circulation pump 28-1 is driven at a rotational speed corresponding to the combination of these functions (S105). That is, in the single operation of the high temperature heating load 34-1, the rotation speed N1, and in the single operation of the low temperature heating load 34-2, the rotation speed N2 according to the number of connected terminals, the high temperature heating load 34-1 and the low temperature heating load 34-2. In the case of both-side operation, the circulation pump 28-1 is driven at the rotation speed N (= N1, N2 or N3) corresponding to the operation mode, such as the rotation speed N3.

  With the above processing, the rotation speed of the circulation pump 28-1 for circulating the heat medium M is determined, and the circulation pump 28-2 for circulating the bath water BW is set to a predetermined rotation speed when performing a reheating operation (YES in S106). (S107), and when the follow-up operation is not performed (NO in S106), the operation is stopped (S107). The rotational speed of the circulation pump 28-2 may be controlled by the combustion amount of the burner 20.

  In this pump rotation speed control, the flow rate of the heating medium M changes according to the rotation speed of the circulation pump 28-1. The feed pump control (FF control) is used for the control of the circulation pump 28-1, and the rotation speed is controlled according to the combination of hot water supply (large hot water supply, small hot water supply), high temperature heating, and low temperature heating (number of connected terminals). To do.

  In the follow-up single operation, the heat medium M is circulated at a predetermined rotational speed in order to prevent the heat medium M from boiling. At this time, the heat medium M passes through the heat exchanger 6-2 and is internally circulated in the apparatus housing 42 by the return path 10. If it is not a chasing alone, the rotation speed of the circulation pump 28-1 may be set to a rotation speed adapted to other functions.

  In hot water supply (including pouring) single operation or reheating operation simultaneously with hot water supply, the amount of heat required for heating depending on the detected temperature of the temperature sensor 50-1, the detected value of the water supply amount sensor 52, and the set temperature of the hot water supply or pouring hot water What is necessary is just to calculate (number). For example, the number of rotations of the circulation pump 28-1 corresponding to the flow rate of the heating medium M of 80 [° C.] is obtained as a constant temperature, and the circulation pump 28-1 is controlled to the number of rotations. Thereby, it is possible to prevent a temporary stop of combustion without heating the heating medium M more than necessary.

<Burner combustion control>

  FIG. 10 shows a procedure for burner combustion control. This processing procedure is an example of the heat exchange method of the present invention. In this burner combustion number control, it is determined whether the circulation pump 28-1 is driven (S201). If the circulation pump 28-1 is driven (YES in S201), the combustion control of the burner 20 is performed so that the temperature detected by the temperature sensor 50-4 of the heating medium M is a constant temperature T1, for example, T1 = 80 ° C. (S202).

  If the circulation pump 28-1 is not driven (NO in S201), the burner 20 is not burned (S203). That is, the heat medium M or the bath water BW is not heated.

  In this burner combustion control, the combustion amount of the burner 20 is controlled so that the heat medium M becomes a predetermined temperature, for example, 80 [° C.] while the circulation pump 28-1 is driven. In this case, although a flow sensor may be installed, since the flow sensor is not installed, the driving of the circulation pump 28-1 is set as a control condition without detecting the flow rate of the heat medium M. In this case, regardless of the flow rate of the heat medium M flowing through the first heat medium heat exchanging unit 6-111, the amount of fuel gas is adjusted so that the temperature detected by the temperature sensor 50-4 becomes a predetermined temperature, for example, 80 [° C.]. Make adjustments. When the temperature detected by the temperature sensor 50-5 is close to a predetermined temperature, combustion may be stopped.

<Hot water control>

  FIG. 11 shows a processing procedure for hot water supply control. This processing procedure is an example of the heat exchange method of the present invention. This process is performed when the heat exchange between the water supply W from the water supply path 14-1 and the heat medium M is performed in the second heat exchanger 6-2, or the hot water HW is discharged from the hot water supply path 14-2, or The control of the mixing valve 32-3 regarding the pouring to the bathtub is included.

  In this hot water supply control, it is determined whether it is a hot water supply operation (S301). If there is hot water supply (YES in S301), it is determined whether the operation is independent of bathtub pouring (S302).

  If it is an independent operation of the bathtub pouring (YES in S302), the temperature detected by the temperature sensor 50-3 is considered to be heated by the bath water heat exchanger 6-12 with respect to the temperature T2 set by the bather. The mixing valve 32-3 is controlled to reach the temperature (S303).

  If it is not an independent operation of bath pouring (NO in S302), it is determined whether it is an independent operation of hot water supply (S304). If it is a hot water supply single operation (YES in S304), the mixing valve 32-3 is controlled so that the detected temperature of the temperature sensor 50-3 becomes the set temperature T3, and the mixing ratio of the high temperature hot water HW and the low temperature water supply W is set. The hot water HW having the set temperature T3 is adjusted and discharged (S305).

  If it is not a single hot water supply operation (NO in S304), control corresponding to the case of bath pouring or hot water supply is performed (S306). In this S306, control such as pouring priority and hot water priority is performed. In the pouring priority, the pouring operation is executed in preference to the hot water supply operation, and the temperature control is the same as that of the single pouring operation. In this case, the hot water supply temperature tends to be lower than the hot water supply set temperature T3. In hot water supply priority, the hot water supply operation is given priority over the pouring operation. When a hot water supply operation occurs during the pouring operation and this hot water supply operation is executed, the hot water operation is temporarily stopped.

  In this hot water supply control, the presence or absence of hot water supply is detected by the water supply amount sensor 52. Whether or not the bath pouring is used alone is determined by comparing the detection values of the pouring amount sensor and the water supply amount sensor 52. If there is a difference between them, the hot water supply and the pouring are used simultaneously. In the case of pouring alone, the hot water HW that has passed through the temperature sensor 50-3 flows into the circulation path 8-2 and is poured into the bathtub 12 from the forward pipe 8-22 and the return pipe 8-21. When passing through the forward pipe 8-22, it is heated by the bathtub water heat exchanger 6-12, so that the temperature sensor 50-3 is mixed at a temperature lower than the bathtub set temperature T2 in consideration of this temperature rise. The mixing ratio of the valve 32-3 is controlled.

  In the case of hot water supply alone, the mixing valve 32-3 is controlled so that the temperature sensor 50-3 reaches the set temperature T3.

  And when pouring and hot water supply occur simultaneously, control corresponding to simultaneous use is performed, and at least the temperature detected by the temperature sensor 50-3 is such that the temperature of pouring and hot water takes into account the simultaneous occurrence state. The mixing ratio of the mixing valve 32-3 is controlled.

<Hot-water supply operation>

  FIG. 12 shows the flow of the heat medium M and the water supply W during the hot water supply operation. In this hot water supply operation, the heated heat medium M is circulated to the heat exchanger 6-2 through the circulation path 8-1. Thereby, heat exchange with the water supply W from the water supply path 14-1 and the heat medium M is performed, and the hot water HW discharges hot water from the hot water supply path 14-2.

<Pursuit operation>

  FIG. 13 shows the flow of the bathtub water BW and the heating medium M when the bathtub water BW is replenished. In this reheating operation, the bathtub water BW is circulated through the bathtub water heat exchange section 6-12 of the heat exchanger 6-1 to exchange heat between the bathtub water BW and the combustion exhaust EG. In this case, since the combustion exhaust EG of the burner 20 flows to the heat medium heat exchanging unit 6-111, heat exchange between the heat medium M and the combustion exhaust EG is inevitably performed, and if the heat medium M is not circulated, boiling occurs. May occur. Therefore, the circulation pump 28-1 is driven to circulate the heat medium M in the circulation path 8-1.

<Heating operation>

  FIG. 14 shows the flow of the heat medium M during the heating operation. In this heating operation, the circulation pump 28-1 is driven to circulate the heat medium M through the circulation path 8-1 and the heating circuits 8-11 and 8-12.

<Effect of Example>

  (1) According to the hot water supply / reheating / heating device 40, the same effects as those of the heat source device 2-2 according to the second embodiment can be obtained.

  (2) According to the hot water supply / reheating / heating device 40, it is possible to realize a hot water supply / reheating / heating device with high thermal efficiency as well as compactness.

  (3) High temperature hot water HW and low temperature heating can be realized.

[Other Embodiments]

  a) In the first embodiment, the heat medium M after heat exchange in the heat medium heat exchange unit 6-11 and the heat medium M before heat exchange in the heat medium heat exchange unit 6-11 are mixed by the mixing valve 32-2. Although it mixes, it is not limited to this. As described in the second embodiment and examples, the heat medium M during the heat exchange of the heat medium heat exchange unit 6-11, that is, after the heat exchange of the second heat medium heat exchange unit 6-112 The heat medium M before heat exchange of the first heat medium heat exchange unit 6-111 and the heat medium M after heat exchange of the first heat medium heat exchange unit 6-111 are mixed by the mixing valve 32-2. May be.

  b) Although the bathtub water heat exchanging unit 6-12 is configured with a primary heat exchanger in the above embodiment, a configuration in which a secondary heat exchanger is provided for heating the bathtub water BW may be employed.

  c) You may use the heat of the heat carrier M of the said embodiment for bathroom heating or a bathroom dryer.

As described above, the most preferred embodiment of the heat source device has been described. The present invention is not limited to the above description. Various modifications and changes can be made by those skilled in the art based on the gist of the invention described in the claims or disclosed in the embodiments for carrying out the invention. It goes without saying that such modifications and changes are included in the scope of the present invention.

In the heat source device and the heat exchange method of the present invention, since the heating medium heating of the bath water is not used, the liquid heat exchanger is not used, and the heat exchange between the combustion heat and the bath water is performed. It is possible to reduce the number of units, and to realize efficient heat exchange with downsizing.

2-1, 2-2 Heat source device 4 Heat source 6-1 First heat exchanger 6-2 Second heat exchanger 6-11 Heat medium heat exchange section 6-111 First heat medium heat exchange section 6- 112 2nd heat-medium heat exchange part 6-12 Bath water heat exchange part 6-13 Heat exchange part for hot water supply 8-1 1st circuit 8-11, 8-12 Heating circuit 8-2 2nd circuit 8-21 Return pipe 8-22 Outgoing pipe 10 Return path 12 Bath 14-1 Water supply path 14-2 Hot water supply path 14-3 Bypass path 20 Burner 22 Combustion chamber 24 Air supply fan 26 Exhaust hole 28-1, 28-2 Circulation Pump 30 Tank 32-1 Distribution valve 32-2, 32-3 Mixing valve 32-4 Fuel control valve 34-1 High-temperature heating load 34-2 Low-temperature heating load 36-1 Branch part 36-2 Branch part 40 Hot water supply / refurbishment -Heating device 42 Device housing 43 Fuel supply pipe 44 Endothermic fin 4 Drain receptacle 48 Drain tank 50-1, 50-2, 50-3, 50-4, 50-5 Temperature sensor 52 Water supply amount sensor 54 Electrical board 56 Power supply unit 58 Hot water supply / reheating / heating control unit 60-1, 60 -2, 60-3 Remote control device 62 Processor 64 Memory unit 66 System communication unit

Claims (12)

A heat source,
A first circulation path for circulating the heat medium;
A second circulation path for circulating the bath water;
A first heat exchanger including a heat medium heat exchanging unit for exchanging heat between the heat of the heat source and the heat medium, a bath water heat exchanging unit for exchanging heat between the heat of the heat source and the bath water,
A second heat exchanger that performs heat exchange between the heat of the heat medium heated by the heat medium heat exchanging unit and the feed water to generate hot water;
A heat source device comprising:   2. The heat source device according to claim 1, wherein the first circulation path includes a return path that passes the second heat exchanger and returns the heat medium to the first heat exchanger. . A distribution valve that distributes the heat medium after heat exchange in the heat medium heat exchange section to at least the first and second paths;
A mixing valve that mixes the heat medium after heat exchange in the heat medium heat exchange part and the heat medium during heat exchange or before heat exchange in the heat medium heat exchange part;
The heat source device according to claim 1, further comprising: The first heat exchanger includes a plurality of primary heat exchangers that directly receive the heat of the heat source, and at least one secondary heat exchanger that receives heat after heat exchange of the primary heat exchanger,
The heat medium heat exchange unit includes at least the primary heat exchanger or includes the primary heat exchanger and the secondary heat exchanger,
The heat source apparatus according to any one of claims 1 to 3, wherein the bathtub water heat exchanger includes at least the primary heat exchanger.   The heat source device according to claim 3 or 4, wherein the first path guides the heat medium to the second heat exchanger, and the second path guides the heat medium to the mixing valve.   The first heat medium circuit for guiding the heat medium from the first path or the second path to a high-temperature heat radiation load is provided. The claim according to any one of claims 3 to 5, Heat source device.   The heat source device according to any one of claims 3 to 6, further comprising a second heat medium circuit that guides the heat medium obtained by the mixing valve to a low-temperature heat radiation load.   The first heat exchanger includes a tapping heat exchange unit that exchanges heat after heat exchange of the primary heat exchanger with water before heat exchange of the second heat exchanger. The heat source device according to any one of claims 4 to 7. A step of circulating a heat medium in the first circulation path at the time of hot water supply, exchanging heat between the heat medium and the heat source, exchanging heat of the heat medium to water supply, and discharging hot water;
A step of circulating the bathtub water in a second circulation path and heating the bathtub water by exchanging heat between the bathtub water and heat of the heat source;
The heat exchange method characterized by including. A heat medium heat exchange unit that receives the heat medium from the first circulation path and exchanges heat between the heat medium and the heat of the heat source;
A bathtub water heat exchanger for receiving bathtub water for chasing from the second circulation path and exchanging heat between the bathtub water and the heat of the heat source;
A heat exchanger characterized by comprising a single unit. Furthermore, the feed water heat exchange unit that receives the feed water before heat exchange with the heat of the heat medium, and exchanges heat between the feed water and the heat of the heat source,
The heat exchanger according to claim 10, comprising: The heat exchanger according to claim 10 or 11, wherein the feed water heat exchange section exchanges heat between the combustion exhaust after heat exchange with the heat medium and the feed water.

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