JP2008196792A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump hot water supply system having a highly efficient water-coolant heat exchanger with improved heat exchange efficiency. <P>SOLUTION: The heat pump hot water supply system is provided with a coolant circuit annularly connecting the water-coolant heat exchanger 1, a pressure reducing means, an evaporator, and a compressor. and a water circuit connected to the water-coolant heat exchanger 1. The water-coolant heat exchanger 1 is composed of an outer tube 11, and an inner tube 12 formed with uneven parts 15. It is composed such that a first fluid 13 flows between the outer tube 11 and the inner tube 12, and a second fluid 14 flows through the inner tube 12, and one of the first fluid 13 or the second fluid 14 flows through the coolant circuit, and the other flows through the water circuit. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat pump hot water supply apparatus for boiling water using a heat pump.

  Conventionally, as shown in FIG. 4, this type of heat pump hot water supply apparatus includes a refrigerant circuit (heat pump unit) 35 in which a water refrigerant heat exchanger 31, a decompression means 32, an evaporator 33, and a compressor 34 are connected in an annular shape, and water refrigerant heat. It comprises a hot water supply circuit 36 that exchanges heat with the exchanger 31 (see, for example, Patent Document 1).

FIG. 5 shows a conventional water-refrigerant heat exchanger 31. As shown in the figure, each of the water-refrigerant heat exchanger 31 has a first fluid pipe 41 and a second fluid pipe 42 formed in a spiral shape. In contact with the contact surface 43. The first fluid pipe 41 is a pipe constituting the refrigerant circuit 35 and the refrigerant flows. The second fluid pipe 42 is a pipe constituting the hot water supply circuit 36 and water flows.
JP 2002-107069 A

  However, in the conventional configuration, as shown in FIG. 5, the first fluid pipe 41 and the second fluid pipe 42 are in contact via the contact surface 43, and the contact area between the first fluid pipe 41 and the second fluid pipe 42 is in contact. Limited to surface 43. Therefore, the heat transfer area between the first fluid piping 41 and the second fluid piping 42 is small, and it is difficult to obtain a large amount of heat exchange.

  Furthermore, since the contact surface 43 has a flat shape, there is a problem that the fluid is less stirred and the efficiency of heat exchange is reduced.

  This invention solves the said conventional subject, and it aims at providing the heat pump hot-water supply apparatus which has a highly efficient water-refrigerant heat exchanger which improved the heat exchange efficiency.

  In order to solve the above-mentioned conventional problems, the heat pump water heater of the present invention is connected to a water refrigerant heat exchanger, a decompression means, an evaporator, a refrigerant circuit in which a compressor is connected in an annular shape, and a water refrigerant heat exchanger. The water refrigerant heat exchanger is composed of an outer tube and an inner tube in which an uneven portion is formed. The first fluid flows between the outer tube and the inner tube, and the second fluid flows in the inner tube. In which one of the first fluid and the second fluid flows through the refrigerant circuit, and the other flows through the water circuit.

  The heat pump hot-water supply apparatus of the present invention can realize improved heat transfer performance and high-efficiency heat exchange by increasing the contact area between the first fluid and the second fluid, and can efficiently supply hot water.

  A first aspect of the present invention includes a water refrigerant heat exchanger, a decompression means, an evaporator, a refrigerant circuit in which a compressor is connected in an annular shape, and a water circuit connected to the water refrigerant heat exchanger, and the water refrigerant heat exchanger Is composed of an outer tube and an inner tube in which an uneven portion is formed. The first fluid flows between the outer tube and the inner tube, and the second fluid flows in the inner tube. One of the fluids flows through the refrigerant circuit and the other flows through the water circuit.

  Since the water-refrigerant heat exchanger is a multiple pipe and the uneven portion is formed on the inner pipe, it is possible to provide a heat pump hot water supply apparatus that can increase heat transfer efficiency and can efficiently supply hot water.

  The second aspect of the present invention is a heat pump hot water supply apparatus that can increase the unevenness by promoting the turbulent flow of the fluid by increasing the number of the inner pipes, further increase the heat exchange efficiency, and can supply hot water more efficiently. Can be provided.

  According to the third aspect of the present invention, by having the inner tube in which the concavo-convex portion is spirally formed along the axis of the tube, fluid agitation occurs, heat transfer is further promoted, and heat exchange efficiency is further improved. It is possible to provide a heat pump hot water supply device that can supply hot water more efficiently.

  4th invention provides the heat pump hot-water supply apparatus which can accelerate | stimulate stirring of a 1st fluid by having an uneven | corrugated | grooved part inside an outer tube | pipe, can further improve heat exchange efficiency, and can supply hot water more efficiently. Can do.

  In a fifth aspect of the invention, the first fluid flows through the refrigerant circuit, the second fluid flows through the water circuit, the first fluid is carbon dioxide, and the second fluid is water. This eliminates the need for a carbon leakage detector tube, which can reduce the number of parts and the cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.
(Embodiment 1)
FIG. 1 is a configuration explanatory view of a heat pump hot water supply apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a cutaway perspective view of a water refrigerant heat exchanger 1 used in the heat pump hot water supply apparatus.

  As shown in FIG. 1, the heat pump hot water supply apparatus according to Embodiment 1 of the present invention is a refrigerant circuit (heat pump unit) 5 in which a water refrigerant heat exchanger 1, a pressure reducing means 2, an evaporator 3, and a compressor 4 are connected in an annular shape. And a hot water supply circuit 6 for exchanging heat with the water refrigerant heat exchanger 1.

  As shown in FIG. 2, the water-refrigerant heat exchanger 1 includes an outer tube 11 and an inner tube 12, and an uneven portion 15 is formed in the inner tube 12. The first fluid 13 flows between the outer tube 11 and the inner tube 12, and the second fluid flows through the inner tube 12.

  In addition, the refrigerant | coolant which flows through the normal refrigerant circuit 5 flows between the outer tube | pipe 11 and the inner tube | pipe 12 as the 1st fluid 13, and the water which flows through the hot water supply circuit 6 flows through the inner tube | pipe 12 as the 2nd fluid 14 in the reverse direction.

  Since the inner tube 12 has the uneven portion 15, the contact area with the first fluid 13 is increased, and the heat exchange efficiency between the first fluid 13 and the second fluid 14 can be improved.

  Furthermore, since the inner tube 12 forms the concavo-convex portion 15, the fluid can be agitated by forming a plurality of inner tubes 12 or forming the concavo-convex portion 15 in a spiral shape along the axis. The heat exchange efficiency can be further improved.

  FIG. 3 shows a water-refrigerant heat exchanger 21 used in a heat pump hot water supply apparatus according to another embodiment of the present invention. This water-refrigerant heat exchanger 21 has an uneven portion 23 formed on the inner side of the outer tube 22, and the uneven portion 23 makes it easy to make the first fluid 13 in a turbulent state, so that the heat exchange efficiency can be further improved.

  Moreover, the carbon dioxide is used as the first fluid 13 flowing through the refrigerant circuit 5 and the second fluid 14 is used as the water flowing through the hot water supply circuit 6, thereby eliminating the need for a carbon dioxide leak detection tube and reducing the number of components.

  As described above, in the present embodiment, by forming the concave and convex portion 15 in the inner tube 12, heat transfer is promoted, and it is possible to have a highly efficient and low cost water refrigerant heat exchanger. It is possible to provide a heat pump hot water supply device that can supply hot water well.

  Further, in the present embodiment, the uneven portion 15 formed on the inner tube 12 is a fin or a baffle plate is provided to promote the thermal interaction between the first fluid 13 and the second fluid 14. Thus, it is possible to provide a heat exchanger with higher efficiency, and to provide a heat pump water heater capable of supplying hot water more efficiently.

  As described above, the heat pump water heater according to the present invention can increase the amount of heat exchange between water and the refrigerant, and thus can be applied to applications that require high-efficiency hot water supply regardless of industrial or household use. .

The block diagram of the heat pump hot-water supply apparatus in Embodiment 1 of this invention Notched perspective view of water refrigerant heat exchanger of the same heat pump water heater The notch perspective view of the water refrigerant | coolant heat exchanger of the heat pump hot-water supply apparatus in other embodiment of this invention Configuration diagram of conventional heat pump water heater The perspective view of the heat exchanger of the heat pump water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,21 Water refrigerant | coolant heat exchanger 2 Pressure reduction means 3 Evaporator 4 Compressor 5 Refrigerant circuit 6 Hot water supply circuit 11, 22 Outer pipe 12 Inner pipe 13 First fluid 14 Second fluid 15 Uneven part 23 Uneven part

Claims (5)

A water refrigerant heat exchanger, a decompression means, an evaporator, a refrigerant circuit connected in a ring shape, and a water circuit connected to the water refrigerant heat exchanger; A first fluid flows between the outer tube and the inner tube, and a second fluid flows through the inner tube, the first fluid and the second tube Any one of the fluids flows through the refrigerant circuit, and the other flows through the water circuit. The heat pump hot water supply apparatus according to claim 1, wherein the inner pipe includes a plurality of inner pipes. The heat pump hot-water supply apparatus according to claim 1 or 2, wherein the inner pipe has an uneven portion spirally formed along the axis of the pipe. The heat pump hot-water supply apparatus according to any one of claims 1 to 3, wherein the outer pipe has an uneven portion. The first fluid flows through the refrigerant circuit, the second fluid flows through the water circuit, the first fluid is carbon dioxide, and the second fluid is water. The heat pump hot-water supply apparatus of any one of 1-4.

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