JP2011242023A - Liquid fuel water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a conventional latent heat recovery heat exchanger in a tube and header method requires a combustion gas passage and a casing having airtightness for the latent heat recovery heat exchanger, and thus, has a complicated shape requiring a considerable skillful technique and accuracy during manufacturing.SOLUTION: A latent heat heat-exchanger 30 comprises: a top plate 41; a bottom plate 43; a side plate 42 covering peripheries of the top plate 41 and the bottom plate 43; and combustion gas passages 33 penetrating the top plate 41 and the bottom plate 43. Combustion gas is brought into contact with the top late 41, the bottom plate 43 and the combustion gas passages 33 penetrating the top plate 41 and the bottom plate 43.

Description

  The present invention relates to a hot water heater that burns liquid fuel, and relates to a hot water heater having not only a heat exchanger that recovers sensible heat but also a heat exchanger that recovers latent heat.

  Conventionally, as a water heater provided with a liquid fuel combustion device and exchanging heat with the combustion gas of the liquid fuel combustion device for hot water, a liquid fuel water heater capable of recovering latent heat for the purpose of improving the heat exchange rate is known. It was. A liquid fuel water heater capable of recovering latent heat includes two heat exchangers, a sensible heat recovery heat exchanger and a latent heat recovery heat exchanger, and recovers the combustion gas obtained by burning liquid fuel into the sensible heat recovery system. The heat exchange was performed by contacting the heat exchanger and the combustion gas after depriving sensible heat was brought into contact with the latent heat recovery heat exchanger to deprive the latent heat. Further, the combustion gas flows through the sensible heat recovery heat exchanger and then the latent heat recovery heat exchanger.

  The latent heat recovery heat exchanger needs to supply water at the lowest possible temperature to recover the latent heat, and the supplied tap water passes through the latent heat recovery heat exchanger, and then the sensible heat recovery heat exchange. It was configured to pass the vessel. In this case, since the latent heat recovery heat exchanger also recovers heat from the water vapor contained in the combustion gas, strongly acidic condensate adheres to the surface of the latent heat recovery heat exchanger, and this condensate is A condensate tray that receives condensed water is installed at the bottom of the latent heat recovery heat exchanger, and the condensed water received in the condensate tray is placed outside the latent heat recovery heat exchanger through the condensate discharge pipe. I was trying to discharge. (See Patent Document 1)

  Combustion gas generated in the liquid fuel combustion apparatus of the liquid fuel water heater is discharged to the outside of the liquid fuel water heater at the exhaust port. In the combustion gas passage inside the liquid fuel water heater from the combustion gas generation source to the exhaust port, the leakage of the combustion gas in the middle means that the liquid fuel combustion apparatus is supplied with air having a high carbon dioxide concentration and supplies the liquid fuel. When the combustion state of the combustion device becomes worse and time elapses, it becomes a so-called short cycle, which is one of the causes of generation of soot and clogging of the heat exchanger. Therefore, the passage of the combustion gas from the combustion gas generation source (liquid fuel combustion device) of the liquid fuel combustion device to the exhaust port needs to be airtight. The combustion gas passages also include sensible heat recovery heat exchangers, latent heat recovery heat exchangers, condensate trays, and passages connecting the sensible heat recovery heat exchanger and latent heat recovery heat exchangers. Was.

  Some liquid fuel water heaters have not only a hot water supply function but also a reheating function. In a liquid fuel water heater that uses a single liquid fuel combustion device to perform hot water supply and reheating functions, a reheating tube heat exchanger is provided inside the sensible heat exchanger for hot water supply. Some sensible heat exchangers for hot water supply have a double structure. (See FIG. 1 of Patent Document 2)

JP 2008-170088 A JP 2009-210203 A

  However, the heat exchanger for latent heat recovery described in Patent Document 1 is composed of a tube and a header, and the entire surface of the tube and the header is in contact with the combustion gas to perform heat exchange. A casing was needed. The casing corresponds to a combustion gas passage through which combustion gas passes, and the casing needs to be airtight. In the case of a hot water supply apparatus or the like provided with a heat exchanger described in Patent Document 1, the latent heat recovery heat exchanger and the sensible heat recovery heat exchanger are connected by a substantially J-shaped long combustion gas passage. It was. And, the long combustion gas passage connecting the sensible heat recovery heat exchanger and the latent heat recovery heat exchanger is not preferable because it generates heat radiation in the combustion gas passage and hinders the latent heat recovery of the combustion gas. there were. Moreover, the fact that a casing having airtightness is required for the substantially J-shaped combustion gas passage and the heat exchanger for recovering latent heat requires a complicated shape that requires a great deal of skill and accuracy in manufacturing. There was a problem.

  When the latent heat recovery heat exchanger is of the tube and header type, the condensate tray that receives the condensate generated in the tube and header receives the condensate generated on the entire surface of the tube and header in order to reliably receive the condensate generated on the tube and header. There is a problem that the condensed water must be received not only in the vertical projection plane but also in a range widened by a predetermined width from the projection plane. In addition, in the case of the heat exchanger of patent document 1, this bottom is solved so that the bottom part (cup part) of the casing also serves as a condensate tray and covers a wide range from the vertical projection surface of the tube and the header. is doing. Further, in this case, it is necessary to be able to withstand strongly acidic condensed water as well as the airtightness of the casing.

  Let's provide a tube and header type heat exchanger for latent heat recovery in a hot water heater described in Patent Document 2 in which a tube heat exchanger for reheating is provided inside a sensible heat exchanger for hot water supply. Then, it is necessary to separately provide a heat exchanger for recovering latent heat for hot water supply and a heat exchanger for recovering latent heat for tracking. When the heat exchanger for recovering latent heat is provided separately for hot water supply and reheating, there is a problem that the structure of the casing becomes complicated. In addition, when the tube is made into a double structure and the inner tube is used for chasing and the outer tube is used as a latent heat recovery heat exchanger for hot water supply, it becomes difficult to create a latent heat recovery heat exchanger. Even in this case, there is a problem that the structure of the water heater itself is complicated. In addition, since reheating is not frequently performed as compared with hot water supply, there is a case in which a latent heat recovery heat exchanger for reheating is not provided and latent heat recovery during reheating is abandoned.

  In order to solve the above problems, the following technical means are taken in the present invention.

The liquid fuel water heater of the first invention includes a latent heat exchanger and a sensible heat exchanger at a lower portion of the latent heat exchanger, and water is supplied in the order of the latent heat exchanger and the sensible heat exchanger. In the liquid fuel water heater, the latent heat exchanger comprises a top plate, a bottom plate, a side plate covering the top plate and the periphery of the bottom plate, and a combustion gas passage penetrating the top plate and the bottom plate, Combustion gas is configured to contact the top plate, the bottom plate, and the combustion gas passage that penetrates the top plate and the bottom plate.
The liquid fuel water heater according to a second aspect of the present invention is the invention according to the first aspect, wherein a condensate recovery device corresponding to the entire surface of the bottom plate is provided below the bottom plate of the latent heat exchanger.
The liquid fuel water heater according to a third aspect of the present invention is the invention according to claim 1, wherein the outer peripheral shape of the lower surface of the latent heat exchanger and the upper surface of the sensible heat exchanger are the same.
According to a fourth aspect of the present invention, there is provided the liquid fuel water heater according to the second or third aspect, wherein a reheating heat exchanger is provided inside the latent heat exchanger.

By taking the technical means as described above, the following effects are obtained.
According to the first invention, the exhaust gas contacts the top plate, the bottom plate, and the combustion gas passage penetrating the top plate and the bottom plate, so that the combustion gas does not pass through the side plate, so that it is difficult for the side plate to condense. Thereby, the condensed water collection | recovery apparatus in the outer periphery of a latent-heat heat exchanger becomes unnecessary, and it has the effect that it is easy to collect condensed water.
According to the second invention, by utilizing the first invention, the condensed water recovery device is made to correspond to the entire surface of the bottom plate, so that the condensed water can be reliably recovered with a simple structure, and the sensible heat in the lower part There is an effect that the condensed water does not fall on the heat exchanger.
According to the third invention, the first invention is used, the connection between the latent heat exchanger and the sensible heat exchanger is facilitated, and the configuration for providing airtightness against the combustion gas is also facilitated. In addition, since the latent heat exchanger and sensible heat exchanger have a continuous and integrated shape, the latent heat heat exchanger and exterior plate are necessary for improving the heat retention and aesthetics as a liquid fuel water heater. This has the effect of easily covering the periphery of the sensible heat exchanger.
According to the fourth invention, since the second or third invention can be used and the heat exchanger for reheating at the time of latent heat recovery can be accommodated with the top plate and the bottom plate of the latent heat heat exchanger removed at the time of manufacture. This has the effect of facilitating assembly.

It is a schematic block diagram of the liquid fuel water heater for demonstrating one Embodiment which concerns on this invention. It is a perspective view explaining the relationship between the heat exchanger for sensible heat recovery, and the heat exchanger for latent heat recovery. It is an exploded view of the heat exchanger for latent heat recovery. It is an exploded view of a condensed water collection | recovery apparatus. It is a schematic block diagram of the liquid fuel water heater for demonstrating other embodiment which concerns on this invention. It is an exploded view of the heat exchanger for latent heat recovery of other embodiments.

  Embodiments for carrying out the invention will be specifically described with reference to the drawings.

  An outline of the liquid fuel water heater of the present invention will be described with reference to FIG. The liquid fuel water heater 1 burns liquid fuel such as kerosene or heavy oil in a combustion device 11 and heats water passed through the heat exchanger with this combustion heat. In order to improve thermal efficiency, not only the sensible heat exchanger 20, but also a latent heat heat exchanger 30 that can improve the thermal efficiency by raising the feed water temperature to the upper part of the sensible heat exchanger 20, that is, the exhaust side. Yes.

  The liquid fuel water heater 1 is connected from a water supply by a water supply pipe 12 and is supplied with water through a pressure reducing valve 13. The depressurized tap water enters from the latent heat exchange inlet 31 at the bottom of the latent heat exchanger 30, passes through the inside of the latent heat exchanger 30, and the latent heat exchange outlet at the top of the latent heat exchanger 30. 32. As a result, the tap water is deprived of heat from the combustion gas partially deprived of heat by the sensible heat exchanger 20 and is heated up. The latent heat exchange port 32 is an internal pipe 14 and is connected to the sensible heat exchange connection port 21 at the intermediate portion in the height direction of the sensible heat exchanger 20. The tap water slightly heated in the latent heat exchange 30 enters from the sensible heat exchange connection port 21, passes through the inside of the sensible heat exchanger 20, and sensible heat exchange in the upper part of the sensible heat exchanger 20. The outlet connection port 22 is reached and connected to a hot water tap (not shown) such as a bathroom by a hot water supply pipe 15. Thereby, the tap water slightly heated in the latent heat exchanger 30 is heated to the set desired temperature by the combustion gas in the sensible heat exchanger 20 and used in the hot water tap. The water supply pipe 12 and the hot water supply pipe 15 are provided with a relief valve (not shown) for the purpose of protecting the sensible heat exchanger 20 and the latent heat exchanger 30.

  If it demonstrates with the flow of combustion gas, the combustion gas which generate | occur | produces when the combustion apparatus 11 will burn will move upwards the some smoke pipe 23 which exists in the inside of the sensible heat exchanger 20. FIG. Each of the plurality of smoke pipes 23 is provided with a rectifying plate 24 that bends the flow of the combustion gas in order to increase the thermal efficiency of the sensible heat exchanger 20. Thereby, in the sensible heat exchanger 20, the tap water slightly heated in the latent heat exchanger 30 is heat-exchanged to a desired temperature.

  The combustion gas heat-exchanged in the sensible heat exchanger 20 passes through the hole 52 in the center of the condensate tray 50 from the lower surface of the condensate tray 50, and the umbrella plate is provided with gaps at regular intervals above the holes 52. From the periphery of 53, it enters the upper latent heat exchanger 30. The combustion gas moves upward through a plurality of smoke pipes 33 in the latent heat exchanger 30. The plurality of smoke pipes 33 are each provided with a rectifying plate 34 for bending the flow of the combustion gas in order to increase the thermal efficiency of the latent heat exchanger 30. After passing through the latent heat exchanger 30, the combustion gas is discharged from the exhaust port 61 of the exhaust unit 60 to the outside of the liquid fuel water heater 1.

  When the combustion gas comes into contact with the latent heat exchanger 30, the latent heat is taken away, and the temperature of the combustion gas further decreases. In this case, since the combustion gas contains water vapor generated by the combustion of the hydrogen component contained in the fuel, condensed water is generated on the surface of the latent heat exchanger 30. The amount of condensed water generated varies depending on the type of fuel, the amount of combustion, the feed water temperature, the humidity of the outside air, etc. and is not constant, but more or less condensed water is generated, and the condensed water contains nitrogen oxides generated by combustion. It becomes a strongly acidic liquid because sulfur oxides dissolve. Since this strongly acidic liquid is generated, the latent heat exchanger 30 is made of a material that can withstand strong acidity.

  Since keeping strong acid condensate in the liquid fuel water heater 1 causes deterioration of the product, the strong acid condensate generated in the latent heat exchanger 30 is latent heat exchange. It is collected by a condensate tray 50, which is a condensate recovery device provided at the lower part of the vessel 30, and discharged from a condensate pipe connection port 54 provided outside the latent heat exchanger 30. If strong acid condensate is discharged with strong acidity, it has an adverse effect on the environment, so a neutralization tank 55 is provided to neutralize this. A condensed water pipe 56 communicates with the condensed water pipe connection port 54, and the condensed water pipe 56 is connected to the neutralization tank 55. The condensed water that has flowed into the neutralization tank 55 is neutralized, and the condensed water that has become almost neutral is discharged to the external sewage or the like through the condensed water discharge pipe 57.

  The sensible heat exchanger 20 and the latent heat exchanger 30 are provided with a heat insulating material 62 for the purpose of preventing heat radiation from the outer surface of the apparatus. In FIG. 1, the heat insulating material 62 is hatched. Note that the sensible heat exchanger 20, the latent heat exchanger 30, the combustion device 11, the neutralization tank 55, and the like, to which the heat insulating material 61 is attached, are placed in an exterior plate (not shown) for installation and aesthetic purposes. It is paid.

  The attachment relationship between the sensible heat exchanger 20 and the latent heat exchanger 30 depending on the size and position will be described with reference to FIG. Both the sensible heat exchanger 20 and the latent heat exchanger 30 are cylindrical in appearance. A sensible heat exchange flange 26 formed integrally with the top plate 25 is provided on the upper surface of the sensible heat exchanger 20. The top plate 25 has a plurality of holes, and a plurality of smoke pipes 23 are welded. On the side surface of the sensible heat exchanger 20, there are provided a sensible heat inlet / outlet port 21, a sensible heat outlet / outlet port 22, a mounting port 27 and a drain port 28 for the combustion device 11. In addition, when installing the liquid fuel water heater 1, the drain port 28 is provided with a drain valve. (See Figure 1)

  On the upper surface of the latent heat exchanger 30, a latent heat heat exchange upper flange 35 formed integrally with the top plate 41 is provided. The top plate 41 has a plurality of holes, and a plurality of smoke pipes 33 are welded. On the side surface of the latent heat exchanger 30, a latent heat input / output connection port 31, a latent heat exchange port 32, and a condensed water pipe connection port 54 are provided. A bottom plate 43 (see FIG. 1) is provided on the lower surface of the latent heat exchanger 30, and a condensate tray 50 (see FIG. 1) is attached to the lower portion of the bottom plate 43. The condensate tray 50 is provided with an integrally formed latent heat exchange lower flange 36 and extends around the lower portion of the latent heat exchanger 30.

  The sensible heat heat exchange flange 26 and the latent heat heat exchange lower flange 36 have a structure in which surfaces facing each other are flat surfaces, and the flat surfaces become a seal surface having a predetermined width, so that airtightness can be easily maintained by using a seal member. It has become. Preferably, when the sensible heat exchanger 20 and the latent heat exchanger 30 have the same cylindrical diameter, the sensible heat exchange flange 26 and the latent heat exchange lower flange 36 contact each other with a predetermined width. It is easy to form the surface. The sensible heat exchanger 20 and the latent heat exchanger 30 preferably have the same cylindrical diameter, but even if the cylindrical diameters are not the same, the sensible heat exchange flange 26 and the latent heat exchange It is also possible to process such that an effective sealing surface is maintained between the lower flange 36 and the lower flange 36.

  FIG. 3 is a view showing assembly of the latent heat exchanger 30, and main components of the latent heat exchanger 30 are a top plate 41, a side plate 42, a bottom plate 43, and a plurality of smoke pipes 33. The top plate 41 has a latent heat heat exchange upper flange 35 on the outer periphery and is integrally formed in a dish shape, and a hole 41a for welding a plurality of smoke tubes 33 is formed in the central disc. . The hole 41a is preferably burred upward in order to facilitate welding with the smoke pipe 33. A depression 41b facing the lower side of the top plate 41 serves as a combustion gas passage. A recess 43b facing the upper side of the bottom plate 43 serves as a passage for combustion gas. The plurality of smoke pipes 33 are hollow cylinders (tubes) having the same diameter and the same length, and the inside serves as a passage for combustion gas. The side plate 42 is a cylinder having an inner diameter equal to the outer diameter of the vertical walls 41c and 43c of the top plate 41 and the bottom plate 43, and the latent heat input / output connection port 31, the latent heat / heat output connection port 32 and the condensed water tube connection port are provided outside. 54 is attached.

  Although the top plate 41 or the bottom plate 43 may be connected to one end of the plurality of smoke tubes 33, the bottom plate 43 is welded here, and then the other top plate 41 is welded to the other end of the smoke tube 33. The top plate 41, the plurality of smoke pipes 33 and the bottom plate 43 welded are inserted into the side plate 42 from the bottom plate 43 side, the vertical wall 41c of the top plate 41 and the side plate 42 are welded, and then the bottom plate 43 The vertical wall 43c and the side plate 42 are welded. Next, the condensed water tray 50 is inserted into the bottom of the bottom plate 43, and the vertical wall 51c of the condensed water tray 50 and the side plate 42 are welded. Note that the outer diameter of the vertical wall 51 c of the condensate tray 50 is also equal to the inner diameter of the side plate 42.

  The condensed water receiving tray 50 will be described with reference to FIG. The condensed water receiving tray 50 includes a tray plate 51 having a hole 52 in the center, an umbrella plate 53 and a plurality of supports 58. The dish plate 51 has a latent heat exchange lower flange 36 connected to the periphery by a vertical wall 51c. Further, a rising portion 59 is provided around the central hole 52 of the plate 51 so that condensed water does not flow from the hole 52 to the sensible heat exchanger 20 side. The plurality of support tools 58 are provided so as to have a space through which the combustion gas can pass between the dish plate 51 and the umbrella plate 53, and both ends of the support tool 58 are welded to the dish plate 51 and the umbrella plate 53. The condensed water receiving tray 50 is formed. The umbrella plate 53 is made larger than the diameter of the hole 52 so that the condensed water dropped from the bottom plate 43 does not pass through the hole 52 and reach the sensible heat exchanger 20. In the present embodiment, an example in which the plate plate 51 has one hole has been described. However, a method in which a plurality of holes are provided and combustion gas is dispersed and guided to the latent heat exchanger 30 may be used.

  Since the first embodiment is configured as described with reference to FIGS. 1 to 4, the combustion gas generated in the combustion device 11 of FIG. 1 passes through the plurality of smoke pipes 23 of the sensible heat exchanger 20. Collected on top of the top plate 25. Since the sensible heat exchanger 20 and the latent heat exchanger 30 are connected as shown in FIG. 2, all the combustion gas passes through the condensate tray 50 and enters the bottom plate 43 of the latent heat exchanger 30. Since the latent heat exchanger 30 is configured as shown in FIG. 3, the portion where the combustion gas comes into contact with the latent heat exchanger 30 is the surface of the bottom plate 43, the plurality of smoke pipes 33, and the top plate 41. And the condensed water which generate | occur | produces when a combustion gas contacts is generated only on the surface of the bottom plate 43, the several smoke pipe 33, and the top plate 41. FIG.

  Condensed water generated in the top plate 41 travels through the plurality of smoke pipes 33 to the bottom plate 43, condensed water generated in the plurality of smoke pipes 33 also flows into the bottom plate 43, and all condensed water collects in the bottom plate 43. A condensate tray 50 is attached to the bottom of the bottom plate 43 so as to receive the entire surface of the bottom plate 43, and all the condensed water generated in the latent heat exchanger 30 is collected in the condensate tray 50. This condensed water is guided to the condensed water pipe connection port 54, passes through the condensed water pipe 56, the neutralization tank 55, and the condensed water pipe 57 and is discharged to the outside.

  The liquid fuel hot water heater 2 of the second embodiment is obtained by adding a tracking function to the liquid fuel hot water heater 1 of the first embodiment, and is the same as the first embodiment except for the added function. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a schematic explanatory diagram of the liquid fuel water heater 2. A bathtub 4 to which a circulation port 3 is attached is provided outside the liquid fuel water heater 2. The liquid fuel water heater 2 includes a sensible heat exchanger 20a provided with a sensible heat tracking heat exchanger 70 therein, a latent heat heat exchanger 30a provided with a latent heat tracking heat exchanger 80 therein, A circulation pump 19 is provided.

  A recirculation circuit constituted by the liquid fuel water heater 2 and the circulation port 3 will be described. When the circulation pump 19 is driven, hot water in the bathtub 4 flows from the suction port of the circulation port 3 to the circulation return pipe 17. The circulation return pipe 17 is connected to the latent heat tracking heat connection port 81 of the latent heat tracking heat exchanger 80 and is indirectly heated by the latent heat tracking heat exchanger 80 to reach the latent heat tracking output connection port 82. The latent heat tracking connection port 82 is connected to the sensible heat tracking input port 71 of the sensible heat tracking heat exchanger 70 via the tracking internal pipe 16, and indirectly through the sensible heat tracking heat exchanger 70. The sensible heat tracking connection port 72 is heated. A circulation outgoing pipe 18 is connected to the sensible heat outlet connection port 72 and reaches the discharge side of the circulation port 3. The circulation pump 19 is provided in the middle of the circulation outgoing pipe 18.

  A method of providing the latent heat tracking heat exchanger 80 inside the latent heat exchanger 30a will be described with reference to FIG. The latent heat exchanger 30 a is in a state where a plurality of smoke pipes 33 are attached to the bottom plate 43. The latent heat input / output connection port 31, the latent heat / heat output connection port 32, and the condensed water pipe connection port 54 are attached to the side plate 42a. The latent heat input connection port 81 and the latent heat extraction connection are connected to the side plate 42a. Holes 81a and 82a to which the mouth 82 is attached are opened.

  The above-described latent heat exchanger 30a has a plurality of smoke pipes 33 attached to the bottom plate 43, and a coiled latent heat tracking heat exchanger 80 is placed at a predetermined position around the plurality of smoke pipes 33. The plurality of smoke pipes 33 and the top plate 41 are welded. Thereafter, the top plate 41, the plurality of smoke pipes 33, and the bottom plate 43, each having a latent heat tracking heat exchanger 80, are inserted into the side plate 42a from the bottom plate 43 side, and the vertical wall 41c of the top plate 41 is inserted. And the side plate 42a are welded, and then the vertical wall 43c of the bottom plate 43 and the side plate 42a are welded. Next, the condensed water tray 50 is inserted into the bottom of the bottom plate 43, and the vertical wall 51c of the condensed water tray 50 and the side plate 42a are welded. The outer diameter of the vertical wall 51c of the condensate tray 50 is also equal to the inner diameter of the side plate 42a.

1, 2: Liquid fuel water heater 3: Circulation port 4: Bathtub
11: Combustion device 12: Water supply pipe 13: Pressure reducing valve 14: Internal pipe 15: Hot water supply pipe 16: Reheating internal pipe 17: Circulation return pipe 18: Circulation return pipe 19: Circulation pump 20, 20a: Sensible heat exchanger 21 : Sensible heat inlet / outlet 22: Sensible heat outlet / outlet 23, 33: Smoke tube 24, 34: Rectifier plate 25, 41: Top plate 26: Sensible heat exchanger flange 27: Mounting port 30, 30a: Latent heat Heat exchanger 31: Latent heat exchange connection port 32: Latent heat exchange port 35: Latent heat exchange upper flange 36: Latent heat exchange lower flange 42, 42a: Side plate 43: Bottom plate 50: Condensate tray 51: Dish plate 52: Hole 53: Umbrella plate 54: Condensate water pipe connection port 55: Neutralization tank 56: Condensate water pipe 57: Condensate water discharge pipe 58: Support tool 59: Start-up part 60: Exhaust part 61: Exhaust part 62: Heat insulation material 70 : Sensible heat tracking heat exchanger 71: Sensible heat tracking connection 72: sensible heat reheating outgoing port 80: latent reheating heat exchanger 81: latent reheating incoming port 82: latent heat reheating outgoing port

Claims (4)

  In the liquid fuel water heater provided with a latent heat exchanger and a sensible heat exchanger below the latent heat exchanger, and water is supplied in the order of the latent heat exchanger and the sensible heat exchanger, the latent heat exchange The vessel comprises a top plate, a bottom plate, a side plate covering the top plate and the periphery of the bottom plate, and the top plate and a combustion gas passage penetrating the bottom plate, and the top plate, the bottom plate, and the top plate and A liquid fuel water heater, wherein the combustion gas is in contact with a combustion gas passage penetrating the bottom plate.   The liquid fuel water heater according to claim 1, wherein a condensate recovery device corresponding to the entire surface of the bottom plate is provided below the bottom plate of the latent heat exchanger.   The liquid fuel water heater according to claim 1, wherein the outer peripheral shape of the lower surface of the latent heat exchanger and the upper surface of the sensible heat exchanger are the same. The liquid fuel water heater according to claim 2 or 3, wherein a reheating heat exchanger is provided inside the latent heat exchanger.

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