JP2007187419A - Hot water supply heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extremely economical hot water supply heating device combining miniaturization of the device and improvement in thermal efficiency on the hot water supply side. <P>SOLUTION: A heating circulation line 18 connected to terminal heaters 33, 35 to circulate heating water is provided with a heating heat exchanger 11 absorbing heat from combustion exhaust gas to heat the heating water in the heating circulation line 18. A hot water supply liquid heat exchanger 40 absorbing heat from the heating water in the heating circulation line 18 heated by the heating heat exchanger 11, to heat the hot water supply water in a water supply line 24, is provided between the water supply line 24 supplying hot water supply water, and a hot water discharge line 49 leading out the heated hot water supply water. Further, a heat exchanger 13 for hot water supply latent heat is provided for recovering latent heat from the combustion exhaust gas which has passed through the heating heat exchanger 11, to heat the hot water supply water in the water supply line 24 prior to the hot water supply liquid heat exchanger 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water supply / air heating apparatus having a hot water heating function and a hot water supply function.

  Conventionally, as this type of hot water supply and heating device, two cans containing a burner and a heat exchanger are provided, and heating water is supplied by a heat exchanger (heating heat exchanger) provided in one can. What heats and supplies hot water for water with the heat exchanger (heat exchanger for hot water supply) provided in the other can body is known (for example, refer patent document 1).

  In this type of hot water heater, the heating water and the hot water are heated by a burner incorporated in each separate can. Furthermore, the heating heat exchanger absorbs the sensible heat from the combustion exhaust and heats it, and the heating sensible heat exchanger recovers the latent heat from the combustion exhaust that has passed through the heating heat exchanger and heats it. The heat exchanger for hot water supply consists of a heat exchanger that absorbs sensible heat from the combustion exhaust and heats it, and recovers the latent heat from the combustion exhaust that has passed through the heat exchanger for hot water supply and heats it. By constituting with the hot water supply latent heat exchanger, high thermal efficiency can be obtained on both the heating side and the hot water supply side.

  However, on the other hand, in order to provide a can body for heating water for heating and a can body for heating water for hot water supply, a combustion fan and other accessory parts are required for each of the two can bodies. In addition to being expensive, there is a disadvantage that the apparatus becomes large.

  In addition, as another conventional hot water supply and heating device, a can body including a burner and a heat exchanger for heating is provided, and the heating water heated by the heating heat exchanger is circulated through the heating circulation path to circulate the heating. There is known a liquid-liquid heat exchanger (liquid-liquid heat exchanger for hot water supply) that absorbs heat from water for heating a road, and heats hot-water supply water using this liquid-liquid heat exchanger (see, for example, Patent Document 2). ).

  In this case, heating of the hot water supply water is not based on the heat absorption from the combustion exhaust gas, but is based on the heat absorption from the heated heating water, so that a single can body may be provided, and the configuration of the heating unit can be simplified. This can reduce the size of the apparatus.

However, heating of hot water for hot water supply using a liquid-liquid heat exchanger has the disadvantage that the thermal efficiency on the hot water supply side is low and uneconomical.
Japanese Patent Laying-Open No. 2005-61677 (FIG. 1) Japanese Patent Laid-Open No. 2003-130448 (FIG. 1)

  The present invention has been made in view of the above inconveniences, and an object of the present invention is to provide an extremely economical hot water heater / heater that achieves both miniaturization of the apparatus and improvement of thermal efficiency on the hot water supply side.

  In order to achieve such an object, the present invention provides a can body in which a burner is built to form a combustion chamber and an exhaust passage, a heating circulation passage that is connected to a terminal heater and in which heating water circulates, and a heating circulation Heating heat exchanger that is provided in a part of the channel and absorbs heat from the combustion exhaust in the can to heat the heating water in the heating circuit, a water supply channel that supplies hot water, and a heating heat exchanger A hot-water liquid-liquid heat exchanger that absorbs heat from the heating water in the heated heating circuit and heats the hot-water supply water in the water supply path, and a hot-water supply path that leads out the hot-water supply water heated by the liquid-liquid heat exchanger for hot water supply In the hot water heater provided, a latent heat exchanger for hot water supply is provided that recovers latent heat from the combustion exhaust gas that has passed through the heat exchanger for heating, and heats the hot water for hot water supply in the water supply channel prior to the liquid-liquid heat exchanger for hot water supply. It is characterized by that.

  In the present invention, by providing the hot water supply latent heat exchanger, the hot water supply water can be heated by the hot water supply liquid-liquid heat exchanger and the hot water supply latent heat exchanger. As a result, compared with the case where the hot water supply water is heated only by the liquid water heat exchanger for hot water supply, the thermal efficiency on the hot water supply side can be dramatically improved, and high economic efficiency can be obtained. In addition, since the heating water and the hot water supply water can be heated only by the combustion exhaust of the burner built in the single can body, the apparatus can be configured inexpensively and compactly.

  In the present invention, the heating heat exchanger includes a sensible heat exchanger for heating that absorbs sensible heat from the combustion exhaust in the can and heats heating water in the heating circuit, and heating heat. The latent heat is recovered from the combustion exhaust gas that has passed through the exchanger, and is constituted by a heating latent heat exchanger that heats the heating water in the heating circuit prior to the heating sensible heat exchanger, the hot water latent heat exchanger It is preferable to recover latent heat from the combustion exhaust that has passed through at least the sensible heat exchanger for heating.

  According to this, since the heating water is heated by the heating latent heat exchanger and the sensible heat exchanger for heating, and high thermal efficiency can be obtained, even when the heat absorption from the heating water by the liquid water heat exchanger for hot water supply is achieved Hot water supply water can be heated more efficiently.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an overall configuration of a hot water supply / heating apparatus according to the present embodiment.

  As shown in FIG. 1, the hot water supply and heating device includes a can body 2 that houses a burner 1 (consisting of a large burner 1a, a middle burner 1b, and a small burner 1c). The can body 2 forms a combustion chamber 2a that houses the burner 1 and an exhaust passage 2b that extends above the combustion chamber 2a and rises the combustion exhaust gas, and an exhaust port 2c that opens at the upper end of the exhaust passage 2b. It has. The combustion chamber 2a is provided with a spark plug 3 for igniting the burner 1 and a frame rod 4 for detecting ignition. The spark plug 3 is driven by an igniter 5. A combustion fan 6 that forcibly sends the combustion air of the burner 1 into the combustion chamber 2a is provided in the lower part of the can body 2.

  The large burner 1a, the middle burner 1b, and the small burner 1c constituting the burner 1 have different combustion amounts, and the combustion amount of the entire burner 1 can be adjusted by the combination thereof. Fuel gas is supplied to the burner 1 through a fuel gas supply pipe 7. The fuel gas supply pipe 7 is provided with an original gas solenoid valve 8 and a gas proportional valve 9 in order from the upstream side. Further, the fuel gas supply pipe 7 branches into three paths downstream of the gas proportional valve 9, each of which is a large burner gas solenoid valve 10 a, a middle burner gas solenoid valve 10 b, and a small burner gas solenoid valve. The large burner 1a, the middle burner 1b, and the small burner 1c are connected via 10c.

  Inside the can 2, a sensible heat exchanger 11 for heating is provided immediately above the burner 1, and latent heat for heating is placed inside the exhaust passage 2 b that is located above the sensible heat exchanger 11 for heating. An exchanger 12 and a hot water latent heat exchanger 13 are disposed.

  Above the sensible heat exchanger 11 for heating and below the latent heat exchanger 12 for heating and the latent heat exchanger 13 for hot water supply are the latent heat exchanger 12 for heating and the latent heat exchanger 13 for hot water supply. A drain pan 14 for collecting the acidic drain dripped from is installed. A neutralizer 16 is connected to the drain tray 14 via a drain outlet pipe 15. The drain neutralized by the neutralizing agent in the neutralizer 16 is drained outside the machine via a drain pipe 17. It has come to be.

  In addition, the hot water supply and heating device of the present embodiment includes a heating circuit 18 (heating circuit) through which heating water is circulated, a hot water supply circuit 19 through which hot water is conducted, and a bathtub (not shown) when bathing. And a bath circulation circuit 20 through which hot water is circulated.

  The heating sensible heat exchanger 11 and the heating latent heat exchanger 12 are provided in a part of the heating circulation circuit 18. The heating sensible heat exchanger 11 absorbs sensible heat from the combustion exhaust in the can 2 and heats the heating water in the heating circuit 18. The heating latent heat exchanger 12 is on the upstream side of the heating sensible heat exchanger 11 in the heating circulation circuit 18 and collects latent heat from the combustion exhaust rising through the heating sensible heat exchanger 11, Prior to the sensible heat exchanger 11 for heating, the heating water in the heating circuit 18 is heated.

  Further, the heating circulation circuit 18 is provided with a heating pump 21 that circulates heating water and a systern 22 for absorbing the volume expansion of the water in the heating circulation circuit 18. The cistern 22 is connected to a water supply pipe 24 which is a part of a hot water supply circuit 19 to be described later via a makeup water pipe 23. In addition, the cistern 22 in the present embodiment also has a function of adjusting the amount of water in the heating circulation circuit 18. That is, the cistern 22 is provided with a low-level water level electrode 26 and a high-level water level electrode 27 for confirming the amount of water in the heating circulation circuit 18, and the make-up water pipe 24 connected to the cistern 22 includes A makeup water electromagnetic valve 25 is provided. Thereby, when the amount of water in the heating circuit 18 is insufficient, the makeup water electromagnetic valve 25 is opened to replenish the heating water, and when the heating water overflows in the systern 22, the drain connection pipe 28 is connected. The water is drained from the drain pipe 17.

  The heating pump 21 forcibly sends out the heating water from the systern 22 toward the heating latent heat exchanger 12 to circulate the heating water in the heating circulation circuit 18.

  Connected between the heating latent heat exchanger 12 and the heating sensible heat exchanger 11 is a low temperature side outlet pipe 29 for extracting relatively low temperature heating water heated only by the heating latent heat exchanger 12. In the downstream of the sensible heat exchanger 11 for heating, a high temperature side for deriving relatively high temperature heating water heated by both the latent heat exchanger 12 for heating and the sensible heat exchanger 11 for heating is provided. A lead-out pipe 30 is connected.

  Further, a low temperature side terminal connection pipe 32 is connected to the low temperature side outlet pipe 29 via a low temperature adjustment valve 31, and the low temperature side terminal connection pipe 32 is connected to a low temperature side terminal heating device 33 such as a floor heater or a panel heater. (Terminal heater) is connected. On the other hand, a high temperature side terminal connection pipe 34 is connected to the high temperature side outlet pipe 30, and a high temperature side terminal heating device 35 (terminal heater) such as an indoor heater or a bathroom heater is connected to the high temperature side terminal connection pipe 34. Has been.

  A low temperature adjustment pipe 36 branched from the high temperature side outlet pipe 30 is connected to the low temperature adjustment valve 31, and the low temperature side outlet pipe is in accordance with the temperature detected by the low temperature side temperature sensor 37 provided in the low temperature side terminal connection pipe 32. The high temperature heating water of the high temperature side outlet pipe 30 is mixed with the 29 low temperature heating water. A heating return pipe 38 for returning heating water to the systern 22 is connected to the outlet side of the low temperature side terminal heating device 33 and the outlet side of the high temperature side terminal heating device 35. The high-temperature side outlet pipe 30 branches from the high-temperature distribution valve 39, one of which passes through the hot water supply liquid / liquid heat exchanger 40 and returns to the systern 22, and the other is the bath liquid / liquid heat exchanger 42. And connected to a bath heating tube 43 that returns to the cistern 22.

  The bath circulation circuit 20 includes a bath liquid-liquid heat exchanger 42 that absorbs heat from high-temperature heating water supplied via a bath heating tube 43, bath connection tubes 44 and 45 that are connected to a bath tub (not shown), And a bath pump 46 for circulating the hot water in the bathtub to the bath circulation circuit 20. The bath circulation circuit 20 is provided with a bath temperature sensor 47 that detects the temperature of hot water in the bath circulation circuit 20 and a bath water flow switch 48 that detects the presence or absence of running water in the bath circulation circuit 20.

  Further, the bath circulation circuit 20 is connected to a hot water filling pipe 50 branched from a hot water discharge pipe 49 which is a part of a hot water supply circuit 19 described later. The hot water filling pipe 50 is provided with a hot water solenoid valve 51 that opens when hot water filling is necessary, and a hot water flow rate sensor 52 that detects the hot water supply flow rate from the hot water filling pipe 50 to the bathtub. . The return-side bath connecting pipe 45 is provided with a water level sensor 53 that detects the water level in the bathtub by hydrostatic pressure during a hot water filling operation.

  Here, the hot water supply circuit 19 will be described. The hot water supply circuit 19 is connected to a water pipe (not shown) and supplies a hot water supply latent heat exchanger 13 and a hot water liquid-liquid heat exchanger 40 (water supply channel 24). ) And a hot water outlet pipe 49 (a hot water outlet) from which hot water heated by the hot water latent heat exchanger 13 and the hot water liquid-liquid heat exchanger 40 is discharged. Further, the water supply pipe 24 is provided with a water amount servo 54 for adjusting the opening degree of the water supply pipe 24 and a water supply flow rate sensor 55 for detecting the water supply flow rate from the water supply pipe 24. Furthermore, between the water supply pipe 24 and the hot water supply pipe 49, a bypass pipe 56 that mixes a part of hot water supplied to the water supply pipe 24 into the hot water supply pipe 49, and bypass mixing that adjusts the opening degree of the bypass pipe 56. A valve 57 is provided.

  The hot water supplied from the hot water supply pipe 24 is first heated by the latent heat of the combustion exhaust inside the can body 2 collected by the hot water supply latent heat exchanger 13, and further the hot water supply heating pipe 41 of the heating circulation circuit 18. It is efficiently heated by the liquid / water heat exchanger 40 for supplying hot water that absorbs heat from the high-temperature heating water supplied through the hot water. In addition, when this inventor confirmed the thermal efficiency in the hot-water supply circuit 19 by various tests, when hot-water supply water is heated only with the liquid-liquid heat exchanger 40 for hot-water supply, since the hot-water supply thermal efficiency remains at 91%, the efficiency performance Although it was low and uneconomical, in the heating of hot water by the hot water latent heat exchanger 13 and the hot water liquid / liquid heat exchanger 40 in the hot water heater of the present embodiment, the hot water thermal efficiency is dramatically improved to 95%. It has become clear that an economical hot water supply operation can be provided.

  In FIG. 1, the hot water supply latent heat exchanger 13 is disposed above the heating latent heat exchanger 12 (downstream of the combustion exhaust flow). Since the vertical positional relationship with the hot water latent heat exchanger 13 is appropriately selected according to the piping layout or the like, either of them may be disposed above.

  In the present embodiment, the burner 1 that burns with gas fuel is used. However, the present invention is not limited to this, and a similar effect can be obtained by using a burner that uses oil or the like as fuel.

1 is an overall configuration diagram of a hot water supply and heating apparatus according to an embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Burner, 2a ... Combustion chamber, 2b ... Exhaust passage, 2 ... Can body, 33 ... Low temperature side terminal heater (terminal heater), 35 ... High temperature side terminal heater (terminal heater), 18 ... Heating circulation circuit (Circulation path for heating), 24 ... water supply pipe (water supply path), 40 ... liquid-liquid heat exchanger for hot water supply, 49 ... tapping pipe (tapping water path), 13 ... latent heat exchanger for hot water supply, 11 ... sensible heat for heating Heat exchanger, 12 ... latent heat exchanger for heating.

Claims (2)

A can body that has a built-in burner to form a combustion chamber and an exhaust passage, a heating circulation passage that is connected to a terminal heater and in which heating water circulates, and a combustion in the can body provided in a part of the heating circulation passage Heat is absorbed from the heating heat exchanger that absorbs heat from the exhaust and heats the heating water in the heating circuit, the water supply path that supplies hot water, and the heating water in the heating circuit heated by the heating heat exchanger. In a hot water supply and heating apparatus comprising a hot water supply liquid / liquid heat exchanger for heating hot water supply water in a water supply path and a hot water supply path for deriving hot water supply water heated by the hot water supply liquid / liquid heat exchanger,
A hot water supply heating system comprising a hot water supply latent heat exchanger that recovers latent heat from the combustion exhaust gas that has passed through the heating heat exchanger and heats the hot water supply water in the water supply channel prior to the liquid water heat exchanger for hot water supply. apparatus. The heating heat exchanger includes a sensible heat exchanger for heating that absorbs sensible heat from the combustion exhaust in the can and heats heating water in the heating circuit, and a combustion exhaust that passes through the heating heat exchanger. It consists of a heating latent heat exchanger that recovers latent heat and heats the heating water in the heating circuit prior to the sensible heat exchanger for heating,
The hot water supply and heating device according to claim 1, wherein the hot water supply latent heat exchanger recovers latent heat from combustion exhaust gas that has passed through at least the sensible heat exchanger for heating.

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