JP2008241177A - Heat pump type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sanitary heat pump type hot water supply device of high heat efficiency in comparison with a conventional heat pump type hot water supply device. <P>SOLUTION: This heat pump type hot water supply device comprises a water storage tank 1 storing the water W heated by a radiating-side heat exchanger 4 of a heat pump unit 2 and provided with a water tank heat exchanger 10 inside thereof for heating the flow water W flowing therein by heat exchange with the stored water W, and a baffle member 41A disposed at an intermediate height position higher than an opening 21a of a low position-side water pipe 21 in the water storage tank 1 for controlling the vertical water flow in the water storage tank 1. The baffle member is composed of one or both of a transverse-mounted plate member 41A partitioning an internal space of the water storage tank 1 in the vertical direction and a longitudinal-mounted plate member partitioning the internal space of the water storage tank 1 in the radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump including a compressor that compresses a refrigerant, a heat-dissipation side heat exchanger that condenses the compressed refrigerant to dissipate heat, and a heat-absorption-side heat exchanger that absorbs heat from the air by evaporating the condensed refrigerant. The present invention relates to a heat pump type hot water supply apparatus that heats stored water in a water storage tank by a unit.

FIG. 5 shows a compressor 3 that compresses a refrigerant, a heat radiation side heat exchanger 4 that condenses the compressed refrigerant to dissipate heat, and a heat absorption side heat exchanger 6 that evaporates the condensed refrigerant and absorbs heat from the air. A conventional example of a heat pump type hot water supply apparatus in which the stored water W in the water storage tank 1 is heated by the heat pump unit 2 provided with the above is shown. In this conventionally known heat pump type hot water supply apparatus, the water storage tank 1 and the heat radiation side heat exchanger 4 of the heat pump unit 2 are connected by a low position side water pipe 21 and a high position side water pipe 22, and the stored water in the water tank 1 is stored. W ₁ is supplied to the heat radiation side heat exchanger 4 side by the pump 23 to heat the stored water W ₁ . On the other hand, makeup water (usually tap water) W ₀ is supplied to the water storage tank 1 through the water supply pipe 7, and the stored water W ₁ heated and stored in the water storage tank ₁ is supplied from the hot water supply pipe 8. It is taken out and used for applications such as baths, kitchens and showers. In FIG. 5, reference numeral 30 denotes a heating radiator that uses hot water supplied from the water storage tank 1 as a heat source, 31 and 32 are connection pipes, and 33 is a hot water circulation pump.

  By the way, according to the inventors of the present application, it has been found that such a conventionally known heat pump type hot water supply apparatus has the following improvements.

(A) Although the scale gradually accumulates in the water storage tank 1 during the long-term use of the hot water supply device, conventionally, the stored water W ₁ containing the scale is directly applied to the human body like a bath, kitchen, shower, etc. It is used for applications that are supplied directly (of course, even hot water supplied by this conventional heat pump hot water supply device does not mean that there is any problem in terms of hygiene, but depending on the user, for example, There may be a certain level of resistance when used for drinking).

(A) Generally, in the heat-radiation side heat exchanger 4 of the heat pump unit 2, the heating efficiency for the heated water is better as the temperature difference between the condensed refrigerant and the heated water (reserved water W ₁ ) is larger. However, in the conventionally known heat pump type hot water supply apparatus shown in FIG. 5, the water temperature in the tank is averaged by free convection of the stored water W _{1 in} the water storage tank 1 or by forced convection by circulating water flow with the radiator 30. As a result, the temperature difference between the condensed refrigerant and the water to be heated cannot be increased in the heat radiation side heat exchanger 4 on the heat pump unit 2 side.

  The present invention has been made on the basis of the above-mentioned knowledge about the conventional heat pump type hot water supply apparatus, and intends to propose a heat pump type hot water supply apparatus that is more hygienic and excellent in heat efficiency.

  In addition, in the range which this inventor investigated, the well-known literature which made it a subject to add some improvement about a heat pump type hot-water supply apparatus from both the sanitary viewpoint and the thermal efficient viewpoint was not discovered.

In the present invention, as a first feature, the hot water in the water storage tank is not used for the purpose of directly contacting the human body, but for the purpose of direct contact with the human body, the heat exchanger in the water tank provided in the water tank is used. Use indirectly heated hot water. In addition, as a second feature, by adding a means for suppressing the water temperature in the water storage tank from being averaged with respect to the water storage tank, a lower side in the water storage tank (a heat radiation side heat exchanger of the heat pump unit). Ensure that the water temperature on the inlet side is maintained at a predetermined temperature or lower than the water temperature on the upper side (as a result, there is a temperature difference between the condensed refrigerant and the water to be heated in the heat dissipation side heat exchanger of the heat pump unit). To be as large as possible). As specific means for realizing the above features, in the heat pump type hot water supply apparatus of the present invention, as illustrated in FIG. 1, the compressor 3 that compresses the refrigerant and the heat dissipation that condenses the compressed refrigerant and dissipates heat. A heat pump unit 2 having a side heat exchanger 4, a heat absorption side heat exchanger 6 that absorbs heat from the air by evaporating the condensed refrigerant, and a low-position side water pipe 21 and a high-position side with respect to the heat pump unit 2 A water tank that stores water W ₁ that is connected by a water pipe 22 and that is heated by the heat-dissipation-side heat exchanger 4 and heats through water W ₂ that exchanges heat with the stored water W ₁ and flows therethrough. The water storage tank 1 is provided with an internal heat exchanger 10, and the water storage tank 1 is located at an intermediate height position higher than the opening 21 a of the low-position side water pipe 21 in the water storage tank 1. Baffle member for restricting the vertical water flow (e.g., later-described horizontal up plate-shaped member 41A, consisting of vertical up plate-shaped member 41B, etc.) is intended, characterized in that a.

In the heat pump type hot water supply apparatus of the present invention configured as described above, the hot water supplied directly to the human body such as a bath, kitchen, shower, etc. is a heat exchanger in the water tank provided in the water storage tank 1 the 10 obtained by once-through water W ₂ flowing through, (including scale) to have accumulated in the water storage tank 1 as in the conventional heat pump type hot water supply apparatus tank stored water W ₁ is fed toward the human body directly Will never be done.

Further, a baffle member provided at an intermediate position in the water storage tank 1 above the opening 21 a of the low-position side water pipe 21 regulates the water flow in the vertical direction in the water storage tank 1, and the stored water W in the water storage tank 1. _In the water storage tank 1, the water temperature on the lower (bottom) side is kept as low as possible in the water tank 1, so that the heat temperature of the heat pump unit 2 is radiated. 4, water to be heated at a relatively low temperature can be supplied to the heat pump unit 4, and as a result, the heating efficiency of the heat pump unit 2 can be improved.

  The baffle member is a horizontal plate-like body 41A that divides the internal space of the water storage tank 1 in the vertical direction as illustrated in FIGS. 1 and 4, or the internal space of the water storage tank 1 as illustrated in FIG. The vertical plate-like body 41B may be divided into two, or as shown in FIG. 3, it may be a combination of a horizontal plate-like body 41A and a vertical plate-like body 41B.

  The horizontal plate-like body 41A illustrated in FIGS. 1, 3 and 4 can be, for example, a disc-like perforated plate (or non-porous plate) made of synthetic resin or stainless steel, and the number thereof is also the water storage tank 1. Only one sheet may be provided at an intermediate height position higher than the opening 21a of the low-position side water pipe 21 in the inside, or a plurality of sheets may be provided in multiple stages.

  The vertical plate-like body 41B illustrated in FIGS. 2 and 3 can be a cylindrical porous plate (or non-porous plate) made of, for example, synthetic resin or stainless steel, and the number thereof is also low in the water storage tank 1. Only one may be provided at an intermediate height position higher than the opening 21a of the side water pipe 21, or a plurality of concentric circles may be provided. The vertical plate-like body 41B functions as a baffle member that regulates the vertical water flow in the water storage tank 1 because the vertical plate-like body 41B subdivides the space in the water storage tank 1 in the radial direction. This is because the vertical water flow (convection) in the tank 1 is suppressed as compared with the case where there is no vertical plate-like body 41B.

  In addition, even if the vertical plate-like body 41B is not only a cylindrical shape but also a vertical flat plate shape, the action of suppressing the vertical water flow in the water storage tank 1 by subdividing the space in the water storage tank 1 in the radial direction. can get.

As described above, by providing baffle members (41A, 41B) in the water storage tank 1, the vertical water flow in the water storage tank 1 is suppressed and the temperature difference (upper side portion W) between the water W ₁ in the water storage tank 1 is suppressed. Although toward the lower-side portion W _1b than _1a is those to produce a low temperature), the heat pump type hot water supply apparatus of the present invention, in addition to the above operation of the baffle member, the water tank in the heat exchanger 10 also may be conducive to the upper and lower temperature difference (upper side high temperature and the lower side cold) generating action on the stored water W ₁ in the water storage tank 1 by the action of its own. Hereinafter, the implementation will be described.

An example of the embodiment for promoting the vertical temperature difference generating action on the stored water W ₁ by the heat exchanger 10 in the water tank will be described with respect to the heat pump hot water supply apparatus shown in FIG. 1. In the heat pump hot water supply apparatus shown in FIG. The water supply side pipe line 7 to the water heat exchanger 10 in the water tank is suspended in a straight tube shape up to the vicinity of the bottom in the water storage tank 1, and the water of the coiled tubular body extends from the lower end to the outlet side pipe line 8 on the outlet side. While the tank heat exchanger 10 is configured, the water tank heat exchanger 10 is configured such that the pipe inner diameter is relatively small with respect to the upper side part 10A having a relatively large pipe inner diameter and the upper side part 10A. The lower side portion 10B is connected by a pipe joint 10D. In this way, the flow-through water W ₂ flowing through the heat exchanger 10 in the water tank has a lower pipe inner diameter in the lower side portion 10B having a relatively smaller inner diameter than in the upper side portion 10A having a relatively larger inner diameter. flow rate becomes faster, the heat exchange action between the lower side portion W _1b of the storage tank stored water W ₁ is more increased reduction, absorbs heat from the lower-side portion W _1b of the storage tank stored water W ₁ (except Thermal action) is greater than the endothermic action (heat removal action) of the upper part W _1a , and as a result, the temperature of the water W ₁ stored in the water storage tank is lower in the lower part W _1b than in the upper part W _1a. Acts as follows.

Next, referring to FIG. 4, another example of the embodiment for facilitating the action of generating the vertical temperature difference with respect to the stored water W ₁ in the storage tank by the heat exchanger 10 in the water tank will be described. In the hot water supply system, the water supply side pipe line 7 to the water heat exchanger 10 in the water tank is suspended in a straight tube shape up to the vicinity of the bottom in the water storage tank 1, and the coil from the lower end to the hot water supply side pipe line 8 on the outlet side The point that the tubular water heat exchanger 10 is the same as that of the heat pump type hot water supply apparatus shown in FIG. 1 is the same as the heat pump type hot water supply apparatus shown in FIG. the coil density in 10 and a high density in the lower side portion 10B from the upper portion 10A (the same to increase the number of coils in the height inside dimension), whereby the water storage tank stored water W ₁ and the water tank in the heat exchanger In 10 Heat exchange action between the flow flowing through water (heated water) W ₂ is, becomes larger in the lower side portion 10B than the upper portion 10A of the water tank in the heat exchanger 10, as a result, the water storage tank reservoir water endothermic for W ₁ (heat removal) larger in the lower-side portion W _1b than the action of the stored water W ₁ upper side portion W _1a, and by extension the temperature in the lower-side portion W _1b storage tank stored water W ₁ The descending action is made larger than that of the upper portion W _1a .

In the heat pump type hot water supply apparatus shown in FIG. 4, a part of the heat exchanger 10 in the water tank 10 (the lowermost part of the lower part 10 </ b> B) 10 </ b> C has a spiral shape 10 </ b> C having a small height difference in the vertical direction. The spiral portion 10C serves as a resistor against the vertical flow of the stored water W _{1 in} the storage tank (thus, the water temperature in the storage tank 1 is suppressed from being averaged).

  In addition, in each heat pump type hot water supply apparatus shown in FIG. 1 to FIG. 4, the lower side portion 10B side of the heat exchanger 10 in the water tank is used as an internally grooved tube having an excellent heat exchanging action. The heat exchange action in the lower side portion 10B of the exchanger 10 may be further promoted.

The heat pump hot water supply apparatus of the present invention includes a compressor 3 that compresses a refrigerant, a heat radiation side heat exchanger 4 that condenses the compressed refrigerant to dissipate heat, and a condensation as illustrated in FIGS. The heat pump unit 2 includes a heat absorption side heat exchanger 6 that evaporates the refrigerant and absorbs heat from the air, and is connected to the heat pump unit 2 by a low position side water pipe 21 and a high position side water pipe 22. A heat exchanger in the water tank that heats the water W ₁ that is heated by the heat radiating side heat exchanger 4 and heats through water W ₂ that exchanges heat with the stored water W ₁ and flows through the water W ₁ . 10 so that the hot water (W ₂ ) heated by the heat exchanger 10 in the water tank can be used for applications such as baths, kitchens, showers, etc. that are directly supplied to the human body. Conventional heat As compared with the case where only the stored water W ₁ traces while even the water storage tank 1 which may contain the scale is supplied toward the human body directly as pump type hot water supply apparatus, more resistance without feeling hygienically There is an effect that can use hot water.

In addition, the heat pump type hot water supply apparatus of the present invention has a baffle member that regulates the vertical water flow in the water storage tank 1 at an intermediate height position higher than the opening 21a of the low-position side water pipe 21 in the water storage tank 1. For example, the lower portion W _1b of the stored water W ₁ is set at a relatively low temperature in the water storage tank 1 because the horizontal plate-like body 41A and the vertical plate-like body 41B are provided. The heat exchange efficiency with the heat-dissipation side heat exchanger 4 on the heat pump unit 2 side can be improved.

  Subsequently, several preferred embodiments of the present invention will be described with reference to FIGS. 1 to 4. In FIG. 1 and FIG. 4, a baffle member made of a lateral plate-like body 41A is provided in the water storage tank 1. FIG. 2 shows an embodiment in which a baffle member made of a cylindrical vertical plate 41B is provided in the water storage tank 1, and FIG. 3 shows a baffle member made of a horizontal plate 41A in the water storage tank 1. And two baffle members made up of two cylindrical vertical plate-like bodies 41B and 41B are shown. The horizontal plate 41A in the heat pump type hot water supply apparatus of the embodiment shown in FIGS. 1, 3, and 4 is often made of a stainless steel or synthetic resin porous plate, As long as the direction water flow can be suppressed, the porous plate is not necessarily required.

  The vertical plate-like body 41B in the heat pump type hot water supply apparatus of the embodiment shown in FIGS. 2 and 3 is often formed of a cylindrical body made of stainless steel or synthetic resin, but the inside of the water storage tank 1 is subdivided in the radial direction. And if it can suppress the water flow in the up-down direction in the water storage tank 1, it may not necessarily be a cylindrical body but may be a vertical flat plate.

Next, common items in the embodiments of FIGS. 1 to 4 will be described. The water storage tank 1 in the heat pump hot water supply apparatus of each embodiment has an inner diameter of 500 mm, a height of 1250 mm, and a capacity of 245L. A heat radiation side heat exchanger 4 of the heat pump unit 2 is connected to the water storage tank 1 via a low position side water pipe 21 and a high position side water pipe 22. The heat pump unit 2 compresses the refrigerant (CO ₂ ), radiates heat by condensing the compressed refrigerant (heats the stored water W ₁ in the water storage tank 1), and radiates heat. The side heat exchanger 4 includes an expansion mechanism 5 that decompresses the condensed refrigerant, and a heat absorption side heat exchanger 6 that absorbs heat from the air by evaporating the decompressed refrigerant.

Stored water W ₁ in the water storage tank 1 is fed by a pump 23 of the heat pump unit 2 to the radiation side heat exchanger 4, is refluxed into the water storage tank 1 becomes hot water 85.0 ° C.. The stored water (warm water) W ₁ in the water storage tank 1 heats the flow-through water W ₂ that flows through the heat exchanger 10 in the water tank provided in the water storage tank 1, and is connected by pipes 31 and 32. It is fed by a pump 33 toward the heating radiator 30 that is being used, and can also be used as a heating heat source. In the heat pump type hot water supply apparatus of each embodiment, the radiator 30 has a heating capacity of 9.3 KW (when supplying 85.0 ° C. warm water at 5.0 L / m).

The heat exchanger 10 in the water tank is formed of a coiled tubular body that is continuous with the water supply side pipe 7 that is suspended to the vicinity of the bottom in the water storage tank 1, and is continuous with the hot water supply side pipe 8 on the upper end side thereof. . The feed water W ₀ flowing from the feed water side pipe 7 exchanges heat with the stored water W _{1 in the} water storage tank 1 while flowing through the heat exchanger 10 in the water tank, and becomes hot water (heated water) W _{2 at} 85 ° C. Then, it is taken out from the hot water outlet side pipe line 8. The water supply side pipe line 7 and the hot water supply side pipe line 8 are connected via a bypass pipe 9 and a thermo valve 11, and hot water W _{3 at} 42.0 ° C. is extracted from the hot water pipe 12 by the action of the thermo valve 11. It is supposed to be. 1 to 4, reference numeral 40 denotes an electric heater serving as an auxiliary heat source.

Next, the unique configuration of the water tank heat exchanger 10 for each embodiment shown in FIGS. 1 to 4 will be described. In the heat pump hot water supply apparatus of the embodiment shown in FIGS. part of the water tank in the heat exchanger 10 a tube inner diameter of the (lower side portion) 10B as diameter than the tube inner diameter of the upper portion 10A, the flow rate of the flow-through water W ₂ flowing through the water tank in the heat exchanger 10 The lower side portion 10B is made faster than the upper side portion 10A so that the heat exchange action (heat removal action) for the lower side portion W _1b of the stored water W _{1 in} the water storage tank 1 is the upper side portion of the stored water. It is made larger than W _1a .

Next, the structure of the heat exchanger 10 in the water tank for the heat pump type hot water supply apparatus of the embodiment shown in FIG. 2 will be described. In the heat pump type hot water supply apparatus of this embodiment, the heat exchanger 10 in the water tank made of a coiled tubular body. A certain range from the lower end side of the lower side portion 10B is an internally grooved tube, so that the heat exchange action (heat removal action) with respect to the lower portion W _1b of the stored water around the same portion is increased.

Next, the structure of the heat exchanger 10 in the water tank in the heat pump type hot water supply apparatus of the embodiment shown in FIG. 4 will be described. The heat exchanger 10 in the water tank in this embodiment has a lower side portion 10B of the coil tubular body. The coil density of the lower end portion 10C is larger than the coil density in the water tank heat exchanger upper side portion 10A (the space between the coils is small and spiral). As a result, the heat absorption (heat removal) action from the lower portion W _1b of the stored water due to the coil density itself is increased at the lower end portion (spiral portion) 10C of the heat exchanger in the water tank, and the lower portion W of the stored water. _The temperature drop effect on _1b increases, and the spiral portion 10C acts so as to suppress the water flow in the vertical direction in the water storage tank 1, and the water storage lower side portion W _{1b in the} water storage tank 1 is made as much as possible. It acts to maintain a low temperature.

It is explanatory drawing of the heat pump type hot-water supply apparatus concerning 1st Example of this invention. It is explanatory drawing of the heat pump type hot-water supply apparatus concerning 2nd Example of this invention. It is explanatory drawing of the heat pump type hot-water supply apparatus concerning the 3rd Example of this invention. It is explanatory drawing of the heat pump type hot-water supply apparatus concerning the 4th Example of this invention. It is explanatory drawing of a conventionally well-known heat pump type hot-water supply apparatus.

Explanation of symbols

1 is a water storage tank, 2 is a heat pump unit, 3 is a compressor, 4 is a heat radiation side heat exchanger, 5 is an expansion mechanism, 6 is a heat absorption side heat exchanger, 7 is a water supply side line, 8 is a hot water side line, 9 is a bypass pipe, 10 is a heat exchanger in the water tank, 11 is a thermo valve, 12 is a hot water supply pipe, 21 is a low-position side water pipe, 22 is a high-position side water pipe, 30 is a radiator, 40 is an auxiliary heater, 41A , 41B are baffle members, W ₁ is water stored in the water storage tank, and W ₂ is flow-through water.

Claims (9)

A compressor (3) that compresses the refrigerant, a heat release side heat exchanger (4) that condenses the compressed refrigerant to dissipate heat, and a heat absorption side heat exchanger (6) that absorbs heat from the air by evaporating the condensed refrigerant And a heat pump unit (2) connected to the heat pump unit (2) by a low-position side water pipe (21) and a high-position side water pipe (22). the reservoir water therein as well as storing water (W ₁₎ being heated (W ₁₎ and flow-through water flowing through the inside heat exchanger (W ₂₎ the water tank in the heat exchanger for heating (10) The storage tank (1) is provided at an intermediate height position higher than the opening (21a) of the low-position side water pipe (21) in the storage tank (1). Baffle member that regulates water flow in the vertical direction 41A, 41B) heat pump type hot water supply apparatus, wherein a is provided.   The heat pump hot water supply device according to claim 1, wherein the baffle member is constituted by a horizontal plate-like body (41A) that divides the space in the water storage tank (1) in the vertical direction.   2. The heat pump type hot water supply apparatus according to claim 1, wherein the baffle member is constituted by a vertical plate-like body (41B) that divides the inner space of the water storage tank (1) in the radial direction.   The baffle member is composed of a horizontal plate (41A) that divides the inner space of the water storage tank (1) in the vertical direction and a vertical plate (41B) that divides the inner space of the water storage tank (1) in the radial direction. The heat pump type hot water supply apparatus according to claim 1, wherein Reserved water whose temperature changes due to heat exchange between the stored water (W ₁ ) stored in the water storage tank (1) and the once-through water (W ₂ ) flowing through the heat exchanger (10) in the water tank ( The water tank heat exchanger (10) is configured so that the temperature of W ₁ ) is low on the lower side in the water tank (1) and higher on the upper side in the water tank (1). The heat pump type hot water supply apparatus according to any one of claims 1 to 4, wherein the heat pump type hot water supply apparatus is provided.   The water tank heat exchanger (10) is formed of a tubular body, and the pipe inner diameter of the lower side portion (10B) of the water tank inner heat exchanger (10) is made larger than the pipe inner diameter of the upper side portion (10A). 6. The heat pump hot water supply apparatus according to claim 5, wherein the pipe has a small diameter so that the water flow velocity in the pipe is larger in the pipe lower part (10B) than in the pipe upper part (10A).   The water tank heat exchanger (10) is formed of a tubular body, and the lower side portion (10B) of the water tank heat exchanger (10) is an internally grooved tube. Item 7. A heat pump hot water supply apparatus according to item 5 or 6.   The water tank heat exchanger (10) is formed of a coiled tubular body, and the coil density is higher in the lower side portion (10B) than in the upper side portion (10A) of the water tank heat exchanger (10). The heat pump type hot water supply apparatus according to claim 5, wherein the heat pump type hot water supply apparatus is provided. The heat exchanger (10) in the water tank is constituted by a coiled tubular body, and a part of the coiled tubular body is formed in a spiral shape having a small difference in height in the vertical direction, whereby the spiral portion (10C) stores water. The heat pump type hot water supply apparatus according to any one of claims 5 to 8, wherein the heat pump type hot water supply apparatus is configured to be a resistor against vertical flow of the stored water (W ₁ ) in the tank.

Images