JP2014020683A - Cold/hot water heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold/hot water heat source machine that is compact and requires low manufacturing costs by reducing space occupied by a hydrothermal medium coupling pipe.SOLUTION: A cold/hot water heat source machine includes at least two heat exchangers formed by alternately laminating a plate with a refrigerant passage formed thereon and a plate with a hydrothermal medium passage formed thereon. At least two of the heat exchangers adjacent to each other are arranged side by side in a plate lamination direction, and hydrothermal medium pipe coupling ports respectively disposed on opposed surfaces of the heat exchangers are coupled to each other by a hydrothermal coupling pipe.

Description

  TECHNICAL FIELD The present invention relates to a cold / hot water heat source apparatus that collects heat from a refrigerant in a refrigeration cycle through a heat exchanger and generates cold / hot water, and in particular, a cold / hot water heat source apparatus that reduces the space occupied by piping of the heat exchanger. About.

  In a cold / hot water heat source that collects heat from the refrigerant in the refrigeration cycle through a heat exchanger and generates cold / hot water, the heat exchanger alternates between the plate with the refrigerant flow path and the plate with the water heat medium flow path formed. In general, a large-sized cold / hot water heat source apparatus includes a plurality of refrigeration cycles, and a plurality of heat exchangers corresponding thereto are also provided.

  As an arrangement method of a plurality of heat exchangers and a connection method with a water heat medium connection pipe, two heat exchangers of the same shape having two water heat medium pipe connection ports on one side of the front corner of the heat exchanger are provided. The heat exchanger pipes are shifted in the vertical direction so that the water heat medium pipe connection port faces the front, and the water heat medium pipe connection port of the heat exchanger and the two branch ports of the T-shaped joint are A technique of connecting with an L-shaped tube to configure a water heat medium circulation channel is disclosed (for example, see Patent Document 1).

JP 2007-303762 (for example, see page 4)

  According to the above-described conventional technology, the two heat exchangers are shifted side by side and connected using the T-shaped joint and the L-shaped pipe, so that the shape of the water-heat medium connection pipe becomes complicated, and the water-heat medium connection The space occupied by the tube is increased. As a result, there is a problem that the product is increased in size and the manufacturing cost is increased. Furthermore, when three or more heat exchangers are provided, there is a problem that the water heat medium connection pipe becomes more complicated than in the case of two.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cold / hot water heat source apparatus that reduces the occupied space of the water-heat medium connection pipe, is small, and has low manufacturing costs.

  The cold / hot water heat source apparatus according to the present invention includes cold / hot water provided with at least two heat exchangers formed by alternately laminating a plate having a refrigerant flow path and a plate having a water heat medium flow path. In the heat source machine, at least two adjacent heat exchangers are juxtaposed in the plate stacking direction, and the water heat medium pipe connection ports provided on the opposing surfaces are connected by a water heat medium connection pipe. .

  According to the present invention, the space occupied by the water-heat medium connecting pipe is reduced, and an effect of obtaining a small-sized cold / hot water heat source apparatus with low manufacturing cost is obtained.

It is a system configuration figure of the cold / hot water heat source machine concerning an embodiment of the invention. It is a side view of the front | former stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a front view of the front | former stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a back view of the front | former stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a side view of the back | latter stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a front view of the back | latter stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a figure which shows the relationship between the resistance coefficient ratio and flow rate ratio of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a perspective view of the front | former stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a perspective view of the back | latter stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention. It is a connection diagram of the front | former stage side heat exchanger and back | latter stage side heat exchanger of the cold / hot water heat source equipment which concerns on embodiment of this invention.

Embodiment.
FIG. 1 is a system configuration diagram of a cold / hot water heat source apparatus according to an embodiment of the present invention. The cold / hot water heat source unit 1 includes a heat exchange unit 2 and an outdoor unit 3. The heat exchange unit 2 includes a buffer tank 4 that stores the water heat medium, a circulation pump 5 that circulates the water heat medium, and a pre-stage side that performs heat exchange between the water heat medium and the refrigerant supplied from the outdoor unit 3. The heat exchanger 6 and the rear-stage heat exchanger 7 located on the terminal side are connected by a water heat medium connecting pipe and accommodated in a casing. The front-stage heat exchanger 6 and the rear-stage heat exchanger 7 are juxtaposed in the plate stacking direction so that the same surface faces the same direction, and are connected by the return-side water heat medium connection pipe 8 and the discharge-side water heat medium connection pipe 9. Is done.

  The water heat medium returned from the terminal radiator (not shown) is temporarily stored in the buffer tank 4 and sent to the front-stage heat exchanger 6 and the rear-stage heat exchanger 7 by the circulation pump 5, and the front-stage heat exchanger. 6 and the rear heat exchanger 7 are heated or cooled by the refrigerant of the outdoor unit 3 and then sent to the terminal radiator again.

  Although not shown, the outdoor unit 3 is provided with an outdoor heat exchanger, a compressor, a refrigerant flow rate adjusting valve, and the like. These include a front heat exchanger 6 and a rear heat exchanger 7 of the heat exchange unit 2, a refrigerant pipe, Connected with. Although the refrigerant of the refrigeration cycle and the hydrothermal medium of the heat exchange unit 2 do not mix with each other, they are thermally connected by the front-stage side heat exchanger 6 and the rear-stage side heat exchanger 7. Here, an example is shown in which the outdoor unit 3 includes two or two refrigeration cycles.

FIG. 2 is a side view of the front heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention, and FIG. 3 is the front view of the front heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention. FIG. 4 and FIG. 4 are rear views of the front-stage heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention.
The pre-stage heat exchanger 6 is formed in a rectangular thick plate shape by alternately laminating plates with refrigerant channels and plates with hydrothermal medium channels. 2 to 4, the radiator discharge side water heat medium pipe connection port 61 is located at the upper right corner of the front surface, the radiator return side water heat medium pipe connection port 62 is located at the lower right corner of the front surface, and the rear stage heat is located at the upper left corner of the back surface. Exchanger return side water heat medium pipe connection port 63, rear heat exchanger discharge side water heat medium pipe connection port 64 at the lower left corner of the back surface, gas refrigerant pipe connection port 65 at the upper left corner of the front, and liquid refrigerant at the lower left corner of the front. A tube connection port 66 is provided. Although the gas refrigerant pipe connection port 65 and the liquid refrigerant pipe connection port 66 are provided on the front surface of the heat exchanger 6 in the present embodiment, they may be provided on the back surface.

  The water heating medium branches into a flow path toward the radiator discharge side water heat medium pipe connection port 61 and a flow path toward the rear stage heat exchanger discharge side water heat medium pipe connection port 64 inside the front stage heat exchanger 6. Is done. Further, the flow path from the radiator return-side water heat medium pipe connection port 62 and the flow path from the rear-stage heat exchanger return-side water heat medium pipe connection port 63 are configured to merge.

  FIG. 5 is a side view of the rear-stage heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention, and FIG. 6 is the front view of the rear-stage heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention. FIG. Similarly to the front-side heat exchanger 6, the rear-stage heat exchanger 7 is formed in a rectangular thick plate shape by alternately laminating plates with refrigerant channels and plates with water-heat medium channels. ing. As shown in FIGS. 6 and 7, the front radiator discharge side water heat medium pipe connection port 71 is located at the front upper right corner, the front heat exchanger return side water heat medium pipe connection port 72 is located at the front lower right corner, and the front left upper corner. A gas refrigerant pipe connection port 75 is provided in the part, and a liquid refrigerant pipe connection port 76 is provided in the lower left corner of the front face. Although the gas refrigerant pipe connection port 75 and the liquid refrigerant pipe connection port 76 are provided on the front surface of the heat exchanger 6 in the present embodiment, they may be provided on the back surface.

Hereinafter, the flow at the time of heat exchange between the refrigerant and the water heat medium will be described.
The water heat medium is introduced from the radiator return side water heat medium pipe connection port 62 of the front stage side heat exchanger 6, and flows toward the radiator discharge side water heat medium pipe connection port 61 inside the front stage side heat exchanger 6. It branches into the channel and the flow path which goes to the latter stage heat exchanger discharge side water-heat-medium pipe connection port 64. In the flow path toward the radiator discharge side water heat medium pipe connection port 61, the water heat medium exchanges heat with the refrigerant supplied from the outdoor unit 3 and is heated or cooled. Here, the refrigerant is introduced from the gas refrigerant pipe connection ports 65 and 75 of the front stage side heat exchanger 6 and the rear stage side heat exchanger 7, and the liquid refrigerant pipe connection port of the front stage side heat exchanger 6 and the rear stage side heat exchanger 7. When it flows out from 66 and 76, it heats, and when it flows a refrigerant | coolant in the reverse direction, it cools.
The water heat medium headed toward the discharge heat exchanger pipe connection port 64 on the rear heat exchanger passes through the return water heat medium connection pipe 8 and then returns to the front heat exchanger return side water heat medium pipe of the rear heat exchanger 7. The hydrothermal medium flows into the connection port 72 and heat exchange with the refrigerant supplied from the outdoor unit 3 is heated or cooled. The refrigerant flow in heating or cooling is the same as described above. The water heating medium heated or cooled by the rear-stage heat exchanger 7 passes through the discharge-side water-heat medium connection pipe 9 from the front-stage radiator discharge-side water-heat medium pipe connection port 71, and is followed by the rear-stage heat exchanger 6. It flows into the heat exchanger return side water heat medium pipe connection port 63. In the front stage side heat exchanger 6, the water heat medium heated or cooled by the rear stage side heat exchanger 7 and the water heat medium heated or cooled by the front stage side heat exchanger 6 are merged, and the radiator discharge side water heat It flows out from the medium tube connection port 61.

  By setting the flow direction of the refrigerant and the hydrothermal medium as described above, when the hydrothermal medium is heated, the refrigerant and the hydrothermal medium are opposed to each other, so that the heat exchange rate is improved. On the other hand, when the water heat medium is cooled, the refrigerant and the water heat medium are in parallel flow, so the heat exchange rate is deteriorated. If the flow direction of the hydrothermal medium is reversed, the heat exchange efficiency is good when the hydrothermal medium is cooled, and the heat exchange efficiency is poor when heating. For this reason, the flow direction of the hydrothermal medium is selected depending on which of the cooling operation and the heating operation is prioritized.

  The flow rate of the water heat medium flowing through the front-stage side heat exchanger 6 and the rear-stage side heat exchanger 7 is such that the rear-stage heat exchanger 7 has a return-side water heat medium connection pipe 8 and a discharge-side water heat medium connection pipe 9. Less pressure loss is added. When the flow rate difference between the front-stage side heat exchanger 6 and the rear-stage side heat exchanger 7 becomes large, a difference occurs in the operating conditions of the two refrigeration cycles, and as a result, the efficiency of the chilled / hot water heat source machine decreases or the output decreases. Therefore, it is desirable that the flow rate of the hydrothermal medium is uniform.

In general, the relationship between pressure loss and flow rate is: pressure loss = resistance coefficient × flow rate ² . Therefore, the flow rate is the same as the pressure loss of the front-side heat exchanger 6 and the total pressure loss of the rear-side heat exchanger 7, the return-side water heat medium connection tube 8, and the discharge-side water heat medium connection tube 9. To be distributed. The resistance coefficient of the return side water heat medium connection pipe 8 and the discharge side water heat medium connection pipe 9 is made sufficiently smaller than the resistance coefficient of the water heat medium flow path of the front stage side heat exchanger 6 and the rear stage side heat exchanger 7. Thereby, it becomes possible to make small the flow volume difference of the front | former stage side heat exchanger 6 and the back | latter stage side heat exchanger 7. FIG.

  FIG. 7 is a diagram showing the relationship between the resistance coefficient ratio and the flow rate ratio of the cold / hot water heat source apparatus according to the embodiment of the present invention. When the resistance coefficient ratio is 0 (the resistance coefficient of the water heat medium connecting pipe is 0), the flow rate ratio is 100% (the flow rates of the front-stage heat exchanger 6 and the rear-stage heat exchanger 7 are the same), and the resistance coefficient ratio is As the flow rate increases (the resistance coefficient of the water heat medium connecting pipe increases), the flow rate ratio increases (the flow rate of the rear-stage heat exchanger 7 decreases).

  In the present embodiment, the resistance coefficient of the return side water heat medium connection pipe 8 and the discharge side water heat medium connection pipe 9, the front stage side heat exchanger 6, and the rear stage side heat are set so that the resistance coefficient ratio is 0.01 or less. The resistance coefficient of the water heat medium flow path of the exchanger 7 is set, and the flow rate ratio between the front-stage side heat exchanger 6 and the rear-stage side heat exchanger 7 is suppressed to 1% or less. If the flow rate ratio is 1% or less, it has been found by actual measurement or the like that the efficiency and output of the cold / hot water heat source machine are not affected.

  Further, as an optimum mode in which the resistance coefficient of the return side water heat medium connection pipe 8 and the discharge side water heat medium connection pipe 9 is reduced, the radiator return side water heat medium pipe connection port 62 and the rear stage of the front stage side heat exchanger 6 are used. The heat exchanger discharge side water heat medium pipe connection port 64 is penetrated, and the return side water heat medium connection pipe 8 and the discharge side water heat medium connection pipe 9 are each formed in a straight line shape. By using a straight water-heat medium connection pipe, the space occupied by the water-heat medium connection pipe is reduced, and there is an effect that the manufacturing cost is reduced with a small size.

FIG. 8 is a perspective view of the front-stage heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention, and FIG. 9 is a perspective view of the rear-stage heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention. FIG. A gas refrigerant pipe 67 is connected to the gas refrigerant pipe connection port 65 of the upstream heat exchanger 6, and a liquid refrigerant pipe 68 is connected to the liquid refrigerant pipe connection port 66. The gas refrigerant pipe 67 is disposed on the side surface of the front-stage heat exchanger 6, is bent into a U shape at the upper part of the side surface, and is connected to the gas refrigerant pipe connection port 65. The liquid refrigerant pipe 68 is disposed on the surface of the front-side heat exchanger 6, bent in an L shape twice at the lower surface, and connected to the liquid refrigerant pipe connection port 66.
A gas refrigerant pipe 77 is connected to the gas refrigerant pipe connection port 75 of the rear stage side heat exchanger 7, and a liquid refrigerant pipe 78 is connected to the liquid refrigerant pipe connection port 76. The shapes of the gas refrigerant pipe 77 and the liquid refrigerant pipe 78 are the same as those of the gas refrigerant pipe 67 and the liquid refrigerant pipe 68 connected to the upstream heat exchanger 6.

  FIG. 10 is a connection diagram between the front-stage side heat exchanger and the rear-stage side heat exchanger of the cold / hot water heat source apparatus according to the embodiment of the present invention. As described above, as shown in FIG. 10, the front side heat exchanger 6 and the rear side heat exchanger 7 are juxtaposed in the plate stacking direction, and the linear return side water heat medium connection pipe 8 and discharge side water heat medium connection pipe are arranged. 9, the water heat medium circulation flow path is configured, and the refrigerant pipes have the same shape in the front side heat exchanger 6 and the rear side heat exchanger 7, thereby reducing the space occupied by the heat exchanger and the pipe. Therefore, it is possible to obtain a cold / hot water heat source machine that is reduced in size and cost.

  Further, the resistance coefficient of the return-side water heat medium connection pipe 8 and the discharge-side water heat medium connection pipe 9, the pre-stage side heat exchanger 6, and the rear-stage side heat exchanger 7 are set so that the resistance coefficient ratio is 0.01 or less. By setting the resistance coefficient with the water heat medium flow path, the flow rate of the water heat medium flowing through the front-stage side heat exchanger 6 and the rear-stage side heat exchanger 7 can be made uniform, resulting in a reduction in efficiency caused by the flow rate difference or output. It is possible to obtain a cold / hot water heat source machine that does not cause a decrease.

  Note that although the case where there are two heat exchangers has been described in the present embodiment, the same effect can be realized by adopting the same configuration even when there are three or more heat exchangers.

  DESCRIPTION OF SYMBOLS 1 Cold / warm water heat source machine, 2 Heat exchange unit, 3 Outdoor unit, 4 Buffer tank, 5 Circulation pump, 6 Front side heat exchanger, 7 Back side heat exchanger, 8 Return side water heat medium connection pipe, 9 Discharge side water Heat medium connection pipe, 61 Radiator discharge side water heat medium pipe connection port, 62 Radiator return side water heat medium pipe connection port, 63 Subsequent heat exchanger return side water heat medium pipe connection port, 64 Subsequent heat exchanger discharge side Water heat medium pipe connection port, 65 Gas refrigerant pipe connection port, 66 Liquid refrigerant pipe connection port, 67 Gas refrigerant pipe, 68 Liquid refrigerant pipe, 71 Pre-stage radiator discharge side water heat medium pipe connection port, 72 Pre-stage heat exchanger return Side water heat medium pipe connection port, 75 gas refrigerant pipe connection port, 76 liquid refrigerant pipe connection port, 77 gas refrigerant pipe, 78 liquid refrigerant pipe.

Claims (6)

In a cold / hot water heat source apparatus comprising at least two heat exchangers formed by alternately laminating plates formed with refrigerant flow paths and plates formed with water heat medium flow paths,
Placing at least two adjacent heat exchangers side by side in the plate stacking direction;
A cold / hot water heat source machine characterized in that the water heat medium pipe connection ports provided on the opposing surfaces are connected by a water heat medium connection pipe. Of the adjacent heat exchangers connected by the water heat medium connection pipe, the terminal side is the rear stage heat exchanger, and the other is the front stage heat exchanger,
The rear-stage heat exchanger has a refrigerant pipe connection port and a water heat medium pipe connection port on the front,
2. The cold / hot water heat source according to claim 1, wherein the front side heat exchanger has a refrigerant pipe connection port and a water heat medium pipe connection port on a front surface, and also has a water heat medium pipe connection port on a back surface. Machine. Comprising at least three heat exchangers,
Both excluding the terminal side of the adjacent heat exchangers connected by the water heat medium connecting pipe are the front stage side heat exchangers,
2. The cold / hot water heat source according to claim 1, wherein the front side heat exchanger has a refrigerant pipe connection port and a water heat medium pipe connection port on a front surface, and also has a water heat medium pipe connection port on a back surface. Machine. The cold / hot water heat source unit according to any one of claims 1 to 3, wherein the water heat medium connecting pipe has a linear shape. In the refrigerant pipe connection port provided in front of the rear stage side heat exchanger and the front stage side heat exchanger,
It has two for gas refrigerant and liquid refrigerant,
The shape of the refrigerant pipe connected to each of the refrigerant pipe connection ports is the same in both the rear-stage heat exchanger and the front-stage heat exchanger. The cold / hot water heat source machine as described in the item. In the resistance coefficient ratio, which is the ratio of the water heat medium connecting pipe resistance coefficient and the heat exchanger water heat medium flow path resistance coefficient,
The water heating medium connecting pipe resistance coefficient and the heat exchanger water heating medium flow path resistance coefficient are set so that the resistance coefficient ratio is 0.01 or less. The cold / hot water heat source machine according to one item.

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