JP2008241168A - Heat pump type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type hot water supply device capable of achieving high hot water supply capacity by improving heating performance of a heat pump unit or heat exchanging performance of a tank heat exchanger. <P>SOLUTION: A paddle 11 rotated and driven around a vertical shaft is disposed inside of a water heat exchanger 10 having geometric feature formed by coiling a heat transfer tube 16, and disposed in a water storage tank 1 in a state that its shaft center is vertically directed. According to this constitution, a swirling component is given to the stored water WO in the water storage tank 1 by the rotation of the paddle 11, thus a water flow velocity of the convection outside of the heat transfer tube 16 is increased, heat transfer coefficient outside of the heat transfer tube 16 is improved, and heat exchanging performance of the water tank heat exchanger 10 is improved. Further as the heat exchanging performance of the water tank heat exchanger 10 is improved, heat removal quantity from the stored water W is increased, a water supply temperature to a radiation-side heat exchanger 4 side of the heat pump unit 2 is lowered, and the heating performance of the heat pump unit 2 is improved. The hot water supply capacity of the entire hot water supply device can be remarkably improved by synergistic effect. <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.

  Various proposals have been made for this type of heat pump type hot water supply apparatus (see, for example, Patent Document 1 and Patent Document 2).

  FIG. 7 shows an example of this type of heat pump type hot water supply apparatus. This heat pump hot water supply apparatus includes a compressor 3 that compresses refrigerant, a heat-radiation side heat exchanger 4 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 stored water W in the water storage tank 1 is heated by the heat pump unit 2 including 6. 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 is supplied to the heat radiation side heat exchanger 4 side by the pump 23 to heat the stored water W. On the other hand, makeup water (usually tap water) is supplied to the water storage tank 1 through the water supply pipe 31, and the stored water W heated and stored in the water storage tank 1 is taken out from the hot water supply pipe 32 and bathed. It is used for applications such as kitchens and showers.

  On the other hand, in the heat pump hot water supply apparatus, instead of using the high-temperature water in the water storage tank as it is as the hot water supply water, for example, a tank heat exchanger is arranged in the water storage tank, and water is supplied to the tank heat exchanger. It is also conceivable to raise the temperature of the once-through water by heat exchange with the high-temperature water in the water storage tank, and use this as hot water.

JP 2002-106963 A JP2003-83607A.

  However, in general, in the heat radiation side heat exchanger 4 of the heat pump unit 2, the heating efficiency for the heated water is improved as the temperature difference between the condensed refrigerant and the heated water (reserved water W) increases. In the conventionally known heat pump type hot water supply apparatus shown in FIG. 7, free convection of the stored water W in the water storage tank 1 (particularly, in a structure in which a radiator is connected to the water storage tank 1, in addition to natural convection) The water temperature in the tank is averaged by the forced convection due to the return water flow from the radiator, and as a result, the temperature difference between the condensed refrigerant and the water to be heated is large in the heat radiation side heat exchanger 4 on the heat pump unit 2 side. However, there was a limit to the improvement of the heating performance of the heat pump unit 2.

  On the other hand, the heat transfer by the natural convection of the stored water is dominant in the heat transfer of the stored water in the water storage tank. For this reason, for example, when a configuration in which the tank heat exchanger is disposed in the water storage tank as described above, the flow of the stored water outside the pipe of the heat exchanger is a slow flow due to natural convection. Therefore, the heat transfer coefficient between the through-flow water flowing inside the pipe of the heat exchanger and the stored water flowing outside the pipe is low, and as long as natural convection is used, the heat exchange of the use-side heat exchanger 10 is performed. There is a limit to the improvement of ability.

  Accordingly, the present invention has an object to propose a heat pump type hot water supply apparatus that can obtain higher hot water supply capacity by increasing the heating performance of the heat pump unit and increasing the heat exchange performance of the heat exchanger in the tank. It was made.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, a heat pump unit 2 including a heat radiation side heat exchanger 4 and a heat absorption side heat exchanger 6, and a low-position side water pipe with respect to the heat radiation side heat exchanger 4 of the heat pump unit 2. 21, the water W0 connected through the high-position side water pipe 22 and heated by the heat-dissipation side heat exchanger 4 is stored, and the through-flow water W1 that exchanges heat with the stored water W0 and flows through the inside is heated. A heat pump type hot water supply apparatus comprising a water storage tank 1 provided with a water tank heat exchanger 10, wherein the water tank heat exchanger 10 has a shape in which a heat transfer tube 16 is wound in a coil shape. The paddle 11 that is disposed in the water storage tank 1 with its axis oriented in the vertical direction and that is rotationally driven by the rotary shaft 12 that extends in the vertical direction is disposed inside the heat exchanger 10 in the water tank. Featuring There.

  The second invention of the present application is characterized in that, in the heat pump hot water supply apparatus according to the first invention, a plurality of the paddles 11 are arranged apart in the vertical direction.

  In the third invention of the present application, in the heat pump type hot water supply apparatus according to the first or second invention, the through-flow water W1 flowing in the heat transfer pipe 16 of the heat exchanger 10 in the water tank is rotated in the rotation direction of the paddle 11. While being set in the direction opposite to the flow direction, the partition plate 8 is disposed between the heat transfer tubes 16 adjacent to each other in the axial direction of the heat exchanger 10 in the water tank.

  According to a fourth invention of the present application, in the heat pump type hot water supply apparatus according to the third invention, the partition plate 8 is provided in a region near the lower portion 1b of the heat exchanger 10 in the water tank.

  In the fifth invention of the present application, the heat pump unit 2 including the heat radiation side heat exchanger 4 and the heat absorption side heat exchanger 6, and the low-position side water pipe with respect to the heat radiation side heat exchanger 4 of the heat pump unit 2 21, the water W0 connected through the high-position side water pipe 22 and heated by the heat-dissipation side heat exchanger 4 is stored, and the through-flow water W1 that exchanges heat with the stored water W0 and flows through the inside is heated. A heat pump type hot water supply apparatus comprising a water storage tank 1 provided with a heat exchanger 10 in the water tank, and a plurality of tubes at predetermined intervals on the outer peripheral surface of the heat transfer tube 16 constituting the heat exchanger 10 in the water tank. The outer fin 7 is provided.

  In the sixth invention of the present application, the heat pump unit 2 including the heat radiation side heat exchanger 4 and the heat absorption side heat exchanger 6, and the low-position side water pipe with respect to the heat radiation side heat exchanger 4 of the heat pump unit 2 21, the water W0 connected through the high-position side water pipe 22 and heated by the heat-dissipation side heat exchanger 4 is stored, and the through-flow water W1 that exchanges heat with the stored water W0 and flows through the inside is heated. A heat pump type hot water supply apparatus comprising a water storage tank 1 provided with a heat exchanger 10 in the water tank, wherein the water exchanger 10 in the water tank has a shape in which a heat transfer tube 16 is wound in a coil shape, and its shaft The structure is characterized in that the core is arranged in the water storage tank 1 with the vertical direction and the protrusion 9 is provided on the inner surface 1c of the water storage tank 1.

  In the present invention, the following effects can be obtained.

  (A) According to the heat pump type hot water supply apparatus according to the first invention of the present application, the heat transfer tube 16 has a shape in which the heat transfer tube 16 is wound in a coil shape, and is disposed in the water storage tank 1 with its axis oriented vertically. Since the paddle 11 that is rotationally driven by the rotating shaft 12 extending in the vertical direction is disposed inside the heat exchanger 10 in the water tank, the stored water W0 in the water storage tank 1 is changed by the rotation of the paddle 11. A swirl component is imparted, the convective water flow rate outside the heat transfer tube 16 is increased, and the heat transfer rate outside the tube, that is, the heat transfer rate outside the tube, is improved. As a result, the heat exchange performance between the once-through water W1 flowing in the heat transfer pipe 16 of the water tank heat exchanger 10 and the stored water W0 flowing outside the heat transfer pipe 16 is remarkably improved, and the water tank Hotter hot water W2 can be taken out from the inner heat exchanger 10 side.

  Further, by improving the heat exchange performance of the water tank heat exchanger 10, the amount of heat removed from the stored water W0 by the water tank heat exchanger 10 increases, and the water temperature of the stored water W0 decreases accordingly. The temperature of water entering the heat radiating side heat exchanger 4 side of the heat pump unit 2 is kept low, and the temperature difference between the condensed refrigerant and the water to be heated in the heat radiating side heat exchanger 4 can be increased accordingly. The heating performance of the heat pump unit 2 is improved.

  As these synergistic effects, the heat pump unit 2 can heat the stored water W0 in the water storage tank 1 more efficiently, and the heated water W1 can be efficiently heated by the stored water W0. The hot water supply capacity will be greatly improved.

(B) According to the heat pump type hot water supply apparatus according to the second invention of the present application, since a plurality of the paddles 11 are arranged apart in the vertical direction, the height of the heat exchanger 10 in the water tank is increased. An effect of improving the heat transfer coefficient outside the tube is obtained in substantially the entire region, and the heat exchange capability of the water exchanger 10 in the water tank is further improved. As a result, the effect described in (a) is further promoted.
(C) According to the heat pump hot water supply apparatus according to the third invention of the present application, the following specific effects can be obtained in addition to the effects described in (a) or (b). In other words, in the present invention, the rotational direction of the paddle 11 is set in the direction opposite to the flow direction of the once-through water W1 flowing in the heat transfer pipe 16 of the water tank heat exchanger 10, and the water tank heat exchanger 10 is set. Since the partition plate 8 is disposed between the adjacent heat transfer tubes 16 in the axial direction, the heat transfer tubes 16 positioned between the pair of adjacent upper and lower partition plates 8 are guided by the partition plate 8 and are The stored water W0 flowing outside the tube along the heat transfer tube 16 and the flow direction of the through-flow water W1 flowing inside the heat transfer tube 16 are opposed to each other, and the heat transfer coefficient between them is improved. The effects described in (a) or (b) are further promoted.

  (D) According to the heat pump type hot water supply apparatus according to the fourth invention of the present application, since the partition plate 8 is provided in a region near the lower part 1b of the water tank internal heat exchanger 10, the water tank internal heat Even in the exchanger 10, the heat transfer coefficient outside the tube is improved particularly in the region near the lower portion 1 b, the water temperature of the stored water W 0 near the bottom of the water storage tank 1 is lowered, and the heat dissipation of the heat pump unit 2 is performed. The heating performance of the heat pump unit 2 is further improved by suppressing the incoming water temperature to the side heat exchanger 4 side to be lower.

  (E) According to the heat pump type hot water supply apparatus according to the fifth invention of the present application, a large number of the external fins 7 are provided at predetermined intervals on the outer peripheral surface of the heat transfer pipe 16 constituting the heat exchanger 10 in the water tank. Therefore, the heat transfer coefficient of the heat transfer tube 16 is improved by the heat transfer action of the tube fin 7. As a result, the heat exchange performance in the pipe of the once-through water W1 flowing through the heat transfer pipe 16 of the water exchanger 10 in the water tank and the stored water W0 flowing outside the heat transfer pipe 16 is remarkably improved. Hotter hot water W2 can be taken out from the heat exchanger 10 side.

  Further, by improving the heat exchange performance of the water tank heat exchanger 10, the amount of heat removed from the stored water W0 by the water tank heat exchanger 10 increases, and the water temperature of the stored water W0 decreases accordingly. The temperature of water entering the heat radiating side heat exchanger 4 side of the heat pump unit 2 is kept low, and the temperature difference between the condensed refrigerant and the water to be heated in the heat radiating side heat exchanger 4 can be increased accordingly. The heating performance of the heat pump unit 2 is improved.

  As these synergistic effects, the heat pump unit 2 can heat the stored water W0 in the water storage tank 1 more efficiently, and the heated water W1 can be efficiently heated by the stored water W0. The hot water supply capacity will be greatly improved.

  (F) According to the heat pump type hot water supply apparatus according to the sixth invention of the present application, the heat exchanger 10 in the water tank is formed into a shape in which the heat transfer tube 16 is wound in a coil shape, and its axis is directed in the vertical direction. Since the protrusion 9 is provided on the inner surface 1c of the water storage tank 1 while being disposed in the water storage tank 1, the flow by the natural convection of the stored water W0 in the water storage tank 1 collides with the protrusion 9. A turbulent secondary flow is induced, and this secondary flow increases the water flow velocity outside the tube of the heat transfer tube 16, thereby improving the heat transfer coefficient outside the tube of the heat transfer tube 16, that is, the heat transfer rate outside the tube. . As a result, the heat exchange performance in the pipe of the once-through water W1 flowing in the heat transfer pipe 16 of the heat exchanger 10 in the water tank and the stored water W0 flowing outside the heat transfer pipe 16 is remarkably improved. Hotter hot water W2 can be taken out from the heat exchanger 10 side.

  Further, by improving the heat exchange performance of the water tank heat exchanger 10, the amount of heat removed from the stored water W0 by the water tank heat exchanger 10 increases, and the water temperature of the stored water W0 decreases accordingly. In addition, the temperature of incoming water to the heat radiating side heat exchanger 4 side of the heat pump unit 2 can be kept low. As a result, the temperature difference between the condensed refrigerant and the water to be heated in the heat radiation side heat exchanger 4 can be increased, and the heating performance of the heat pump unit 2 is improved.

  As these synergistic effects, the heat pump unit 2 can heat the stored water W0 in the water storage tank 1 more efficiently, and the heated water W1 can be efficiently heated by the stored water W0. The hot water supply capacity will be greatly improved.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

I: First Embodiment FIG. 1 shows a system diagram of a heat pump hot water supply apparatus according to a first embodiment of the present invention. This hot water supply apparatus includes a water storage tank 1, a heat pump unit 2, and a radiator 30.

A: Water storage tank 1
The water storage tank 1 has a vertically long cylindrical shape, and a predetermined amount of stored water W0 is introduced into the water storage tank 1, and a use-side heat exchanger 10 described below (“water tank internal heat exchange” in the claims). A partition plate 8 and a paddle 11 are disposed.

  The use side heat exchanger 10 is formed by winding a heat transfer tube 16 having a predetermined diameter in a coil shape, and is housed in a standing state in the water storage tank 1, and an upper portion 10 a thereof is connected to a hot water supply tube 15. The lower part 1 b is connected to the water supply pipe 14. Accordingly, the water supply from the water supply pipe 14 once flows down to the lower part 10b side of the use side heat exchanger 10 and then flows through the use side heat exchanger 10 as the through water W1 from the lower part 10b side to the upper part 10a side. While flowing through the user-side heat exchanger 10, the temperature is raised by exchanging heat with the stored water W0 in the water storage tank 1, and is taken out as hot water W2 from the hot water supply pipe 15 for the required use. Provided.

  As shown in FIGS. 1 to 3, the partition plate 8 has an outer diameter and an inner diameter dimension corresponding to the coil shape of the use side heat exchanger 10 in a plan view, and a part in the circumferential direction thereof. It is composed of a cutout C-shaped annular plate. The notch 8a of the partition plate 8 serves as an insertion portion for the heat transfer tube 16 that is wound from the lower side to the upper side.

  As shown in FIG. 1, the partition plate 8 is positioned between the heat transfer tubes 16 adjacent in the vertical direction in the range from the middle stage portion 10 c to the lower portion 1 b of the use side heat exchanger 10. Arranged.

  As shown in FIGS. 1 and 3, the paddle 11 is made of a leaf-shaped plate material, and is installed on a rotating shaft 12 that is erected on a shaft center of the water storage tank 1 and is rotationally driven by a driving source (not shown). And is rotated integrally with the rotary shaft 12. In this embodiment, a plurality of the paddles 11 are provided with a predetermined interval in the axial direction with respect to the rotating shaft 12.

  Further, an auxiliary heater 40 is attached to a position near the upper portion of the body portion 1c of the water storage tank 1. The auxiliary heater 40 operates when the water temperature of the stored water W0 in the water storage tank 1 heated by the heat pump unit 2 described below does not rise to the set water temperature, and additionally stores the stored water W0. It is for heating.

  B: The heat pump unit 2 serves as a heating source for the stored water W0 stored in the water storage tank 1, and includes a compressor 3 that compresses the refrigerant, and a heat dissipation side that condenses the compressed refrigerant and dissipates heat. The heat exchanger 4 includes an expansion mechanism 5 that expands the condensed refrigerant, and a heat absorption side heat exchanger 6 that absorbs heat from the air by evaporating the refrigerant. The heat radiation side heat exchanger 4 is connected to the bottom 1b side of the water storage tank 1 by a low position water pipe 21 and to the top 1a side of the water storage tank 1 by a high position side water pipe 22, respectively. The stored water W0 that has flowed from the bottom 1b side of the water storage tank 1 to the heat radiation side heat exchanger 4 side through the low position water pipe 21 is heated by heat exchange in the heat radiation side heat exchanger 4, and the high position The water is recirculated to the upper portion 1a side of the water storage tank 1 through the side water pipe 22, whereby the stored water W0 in the water storage tank 1 is heated.

C: Radiator 30
The radiator 30 is used, for example, as a plate heat exchanger for heating. One end of the radiator 30 is connected to the upper portion 1a of the water storage tank 1, and the other end is connected to the lower portion 1b. Heating is performed using high-temperature water introduced from the heat source.

  Next, the operation and effect of the heat pump type hot water supply apparatus will be described.

  The stored water W0 stored in the water storage tank 1 circulates on the heat dissipation side heat exchanger 4 side of the heat pump unit 2 and is heated up by heat exchange with the refrigerant on the heat dissipation side heat exchanger 4 side. Be warmed.

  On the other hand, the flow-through water W1 supplied from the water supply pipe 14 to the use side heat exchanger 10 is stored in the water storage tank 1 while flowing from the lower part 10b of the use side heat exchanger 10 to the upper part 10a side. The temperature is raised by heat exchange with the water W0 to obtain hot water W2, which is supplied to the hot water use place such as a bath or kitchen through the hot water supply pipe 15. Further, when heating is performed using the radiator 30, the hot stored water W0 on the upper side of the water storage tank 1 is introduced to the radiator 30 side.

  Here, in the heat pump unit 2, the condensed refrigerant in the heat radiation side heat exchanger 4 and the temperature of the stored water W0 introduced from the bottom 1b side of the water storage tank 1 to the heat radiation side heat exchanger 4 side. It is known that the heating efficiency increases as the temperature difference increases. Therefore, in order to increase the heating efficiency of the heat pump unit 2, the temperature distribution of the stored water W0 in the water storage tank 1 is maintained to be high on the upper 1a side and lower on the lower 1b side. Is required.

  However, the temperature distribution in the vertical direction of the stored water W0 in the water storage tank 1 is averaged by the temperature equalizing action by natural convection, and as a result, there is a limit in increasing the heating efficiency of the heat pump unit 2. Is as described above.

  Further, the water flow rate due to the natural convection of the stored water W0 in the water storage tank 1 is slow. Therefore, when the heat transfer pipe 16 of the use side heat exchanger 10 exists in the natural convective stored water W0, As described above, the heat transfer coefficient outside the tube of the heat transfer tube 16 is low, and as long as natural convection is used, there is a limit to the improvement of the heat exchange capability of the use side heat exchanger 10.

  However, in the hot water supply apparatus of this embodiment, the heat exchange capacity of the use-side heat exchanger 10 and the heating performance of the heat pump unit 2 are increased by the following unique configuration, so that a higher hot water supply capacity can be obtained. So that you can get.

  That is, in the hot water supply apparatus of this embodiment, the use side heat exchanger 10 having a shape in which the heat transfer tube 16 is wound in a coil shape and arranged in the water storage tank 1 with its axis oriented in the vertical direction. A paddle 11 that is rotationally driven by a rotary shaft 12 that extends in the vertical direction is disposed inside the paddle 11. According to such a configuration, the rotation of the paddle 11 gives a swirling component to the stored water W0 in the water storage tank 1 as indicated by the streamline La in FIG. The water flow rate increases, and the heat transfer rate outside the heat transfer tube 16, that is, the heat transfer rate outside the tube is improved. As a result, the heat exchange performance between the through water W1 flowing through the heat transfer pipe 16 of the use side heat exchanger 10 and the stored water W0 flowing outside the heat transfer pipe 16 is significantly improved.

  In addition, by improving the heat exchange performance of the use side heat exchanger 10, the amount of heat removed from the stored water W0 by the use side heat exchanger 10 is increased, and the water temperature of the stored water W0 is lowered accordingly. The temperature of water entering the heat radiating side heat exchanger 4 of the heat pump unit 2 can be kept low, and the temperature difference between the condensed refrigerant and the water to be heated in the heat radiating side heat exchanger 4 can be increased accordingly. The heating performance of 2 is improved.

  Furthermore, in the hot water supply apparatus of this embodiment, since a plurality of the paddles 11 are arranged apart from each other in the vertical direction, the heat transfer coefficient outside the tube is improved over substantially the entire area in the height direction of the use side heat exchanger 10. An effect | action will be acquired and the heat exchanger capability will improve further.

  On the other hand, in the hot water supply apparatus of this embodiment, the rotation direction of the paddle 11 is set to be opposite to the flow direction of the through water W1 flowing in the heat transfer pipe 16 of the use side heat exchanger 10, and the use side heat exchange is performed. Since the partition plate 8 is disposed between the adjacent heat transfer tubes 16 in the axial direction of the vessel 10, as shown in FIG. 2, in the heat transfer tubes 16 positioned between the pair of adjacent upper and lower partition plates 8, The stored water W0, which is guided by the partition plate 8 and flows outside the tube along the heat transfer tube 16, and the flow direction of the through water W1 flowing inside the heat transfer tube 16 are opposed to each other. The heat transfer coefficient outside the tube of the heat exchanger 10 is further improved.

  Further, in this case, as in this embodiment, if the partition plate 8 is provided in a region near the lower portion 1b of the water tank heat exchanger 10, the use side heat exchanger 10 has a particular effect. Since the heat transfer coefficient outside the tube is improved in the region near the lower portion 1b, the water temperature of the stored water W0 near the bottom of the water storage tank 1 is lowered, and the heat pump unit 2 moves toward the heat radiation side heat exchanger 4 side. The water inlet temperature is further reduced, so that the heating performance of the heat pump unit 2 is further improved.

  As a synergistic effect, the hot water supply apparatus of this embodiment has a much higher hot water supply capacity than the conventional hot water supply apparatus.

II: Second Embodiment FIG. 4 shows a system diagram of a heat pump hot water supply apparatus according to a second embodiment of the present invention. This hot water supply apparatus is the same as the hot water supply apparatus according to the first embodiment, and the basic system is different from the hot water supply apparatus according to the first embodiment in that the partition on the use side heat exchanger 10 is the partition. Whereas the plate 8 and the paddle 11 are attached, instead of not having them, a large number of tube fins 7 are provided on the outer surface of the heat transfer tube 16 of the use side heat exchanger 10.

  As described above, when a large number of the external fins 7 are provided on the outer surface of the heat transfer tube 16 of the use side heat exchanger 10 at a predetermined pitch, the external heat of the heat transfer tube 16 is generated by the heat transfer action of the external fin 7. The transmission rate is improved. As a result, the heat exchange performance in the pipe of the through-flow water W1 flowing in the heat transfer pipe 16 of the use side heat exchanger 10 and the stored water W0 flowing outside the heat transfer pipe 16 is significantly improved.

  Further, since the heat exchange performance of the use side heat exchanger 10 is improved in this way, the heat removal amount from the stored water W0 by the use side heat exchanger 10 is increased, and the water temperature of the stored water W0 is correspondingly increased. The temperature of the water entering the heat radiating side heat exchanger 4 of the heat pump unit 2 is reduced. As a result, the temperature difference between the condensed refrigerant and the water to be heated in the heat radiation side heat exchanger 4 can be increased, and the heating performance of the heat pump unit 2 is improved.

  As a synergistic effect, according to the hot water supply apparatus of this embodiment, the hot water supply capacity is significantly higher than that of the conventional hot water supply apparatus.

  In addition, about the magnitude | size and shape of the said external fin 7, the number of arrangement | positioning, etc., it is not limited to the setting in the said embodiment, It can set arbitrarily.

  Moreover, since it is the same as that of the case of the hot water supply apparatus which concerns on the said 1st Embodiment about the structure except the above, description here is abbreviate | omitted by using the applicable description of this 1st Embodiment.

III: Third Embodiment FIG. 5 shows a system diagram of a heat pump hot water supply apparatus according to a third embodiment of the present invention. This hot water supply apparatus is the same as the hot water supply apparatus according to the first embodiment, and the basic system is different from the hot water supply apparatus according to the first embodiment in that the partition on the use side heat exchanger 10 is the partition. Whereas the plate 8 and the paddle 11 are provided, instead of not having them, a hemispherical projection 9 is provided on the inner surface 1c of the water storage tank 1.

  In this embodiment, as shown in FIGS. 5 and 6, the protrusions 9 are arranged at three positions spaced apart in the vertical direction on the inner surface of the water storage tank 1 so as to face each other in the diametrical direction. , Each provided.

  As described above, the heat exchanger 10 in the water tank is formed into a shape in which the heat transfer tube 16 is wound in a coil shape, and the shaft center thereof is arranged in the water storage tank 1 in the vertical direction. By providing the protrusions 9 on the inner surface 1c, the flow of the stored water W0 due to natural convection collides with the surface of the protrusions 9, and as shown by the streamline L in FIG. , A secondary flow Lb that swirls on both sides of the protrusion 9 is induced, and this secondary flow Lb sequentially contacts the heat transfer tube 16 of the use side heat exchanger 10 and rides on the natural convection flow. It moves to the bottom 1b side of the water storage tank 1.

  As a result, the water flow velocity outside the heat transfer tube 16 is increased, the heat transfer coefficient outside the heat transfer tube 16 is improved, and the once-through water W1 flowing through the heat transfer tube 16 of the heat exchanger 10 in the water tank The heat exchange action in the pipe with the stored water W0 flowing outside the heat transfer pipe 16 is promoted, and the heat exchange performance is remarkably improved.

  Further, by improving the heat exchange performance of the water tank heat exchanger 10, the amount of heat removed from the stored water W0 by the water tank heat exchanger 10 increases, and the water temperature of the stored water W0 decreases accordingly. In addition, the temperature of incoming water to the heat radiating side heat exchanger 4 side of the heat pump unit 2 can be kept low. As a result, the temperature difference between the condensed refrigerant and the water to be heated in the heat radiation side heat exchanger 4 can be increased, and the heating performance of the heat pump unit 2 is improved.

  As these synergistic effects, the heat pump unit 2 can heat the stored water W0 in the water storage tank 1 more efficiently, and the heated water W1 can be efficiently heated by the stored water W0. The hot water supply capacity will be greatly improved.

  In addition, about the magnitude | size and shape of the said protrusion 9, the attachment position to the said water storage tank 1, the number of arrangement | positioning, etc., it is not limited to the setting in the said embodiment, It can set arbitrarily.

  Moreover, since it is the same as that of the case of the hot water supply apparatus which concerns on the said 1st Embodiment about the structure except the above, description here is abbreviate | omitted by using the applicable description of this 1st Embodiment.

1 is a system diagram of a heat pump type hot water supply apparatus according to a first embodiment of the present invention. It is a principal part perspective view of the utilization side heat exchanger shown in FIG. It is III-III expanded sectional drawing of FIG. It is a system diagram of the heat pump type hot water supply apparatus according to the second embodiment of the present invention. It is a system diagram of the heat pump type hot-water supply apparatus which concerns on 3rd Embodiment of this invention. It is VI-VI expanded sectional drawing of FIG. It is a system diagram of the conventional heat pump type hot water supply apparatus.

Explanation of symbols

1 ・ ・ Water storage tank 2 ・ ・ Heat pump unit 3 ・ ・ Compressor 4 ・ ・ Heat dissipation side heat exchanger 5 ・ ・ Expansion mechanism 6 ・ ・ Heat absorption side heat exchanger 7 ・ ・ External fin 8 ・ ・ Partition plate 9 ・ ・Projection 10 ・ ・ Use side heat exchanger (water tank heat exchanger)
11 .. Paddle 12 .. Rotating shaft 14 .. Water supply pipe 15 .. Hot water supply pipe 16 .. Heat transfer pipe 21 .. Low position water pipe 22 .. High position side water pipe 30 .. Radiator 31. Piping 40 ・ ・ Auxiliary heater W0 ・ ・ Water to be heated (reserved water)
W1 .. Through water W2 .. Hot water

Claims (6)

A heat pump unit (2) including a heat radiation side heat exchanger (4) and a heat absorption side heat exchanger (6), and a lower position side with respect to the heat radiation side heat exchanger (4) of the heat pump unit (2) The water (W0) connected to the water pipe (21) and the high-position side water pipe (22) and heated by the heat radiation side heat exchanger (4) is stored, and the stored water (W0) and heat are stored therein. In a heat pump type hot water supply apparatus provided with a water storage tank (1) provided with a heat exchanger (10) in the water tank that heats through water (W1) that exchanges and flows through the interior,
The water tank internal heat exchanger (10) has a shape in which a heat transfer tube (16) is wound in a coil shape, and is disposed in the water storage tank (1) with its axis oriented in the vertical direction,
A heat pump type hot water supply apparatus, wherein a paddle (11) that is rotationally driven by a rotary shaft (12) extending in the vertical direction is disposed inside the heat exchanger (10) in the water tank. In claim 1,
A heat pump type hot water supply apparatus, wherein a plurality of the paddles (11) are arranged apart from each other in the vertical direction. In claim 1 or 2,
The rotational direction of the paddle (11) is set in the direction opposite to the flow direction of the once-through water (W1) flowing through the heat transfer pipe (16) of the water tank heat exchanger (10),
A heat pump type hot water supply apparatus, wherein a partition plate (8) is disposed between adjacent heat transfer tubes (16) in the axial direction of the water tank heat exchanger (10). In claim 3,
The heat pump type hot water supply apparatus, wherein the partition plate 8 is provided in a region near the lower part (1b) of the water tank internal heat exchanger (10). A heat pump unit (2) including a heat radiation side heat exchanger (4) and a heat absorption side heat exchanger (6), and a lower position side with respect to the heat radiation side heat exchanger (4) of the heat pump unit (2) The water (W0) connected to the water pipe (21) and the high-position side water pipe (22) and heated by the heat radiation side heat exchanger (4) is stored, and the stored water (W0) and heat are stored therein. In a heat pump type hot water supply apparatus provided with a water storage tank (1) provided with a heat exchanger (10) in the water tank that heats through water (W1) that exchanges and flows through the interior,
A heat pump type hot water supply apparatus, wherein a large number of external fins (7) are provided at predetermined intervals on an outer peripheral surface of a heat transfer pipe (16) constituting the heat exchanger (10) in the water tank. A heat pump unit (2) including a heat radiation side heat exchanger (4) and a heat absorption side heat exchanger (6), and a lower position side with respect to the heat radiation side heat exchanger (4) of the heat pump unit (2) The water (W0) connected to the water pipe (21) and the high-position side water pipe (22) and heated by the heat radiation side heat exchanger (4) is stored, and the stored water (W0) and heat are stored therein. In a heat pump type hot water supply apparatus provided with a water storage tank (1) provided with a heat exchanger (10) in the water tank that heats through water (W1) that exchanges and flows through the interior,
The water tank internal heat exchanger (10) has a shape in which a heat transfer tube (16) is wound in a coil shape, and is disposed in the water storage tank (1) with its axis oriented in the vertical direction,
A heat pump type hot water supply apparatus, wherein a projection (9) is provided on the inner surface (1c) of the water storage tank 1.

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