JPH08136166A - Heat exchanger - Google Patents

Abstract

PURPOSE: To obtain a rational and economical heat exchanger which has excellent heat exchanging efficiency, a small size, energy conservation and low noise by skillfully utilizing the evaporation of water. CONSTITUTION: A heat exchanger has tubes 5 having fins 3 and arranged in a trombone state to cool refrigerant flowing through the tubes, and comprises water distribution pipes 9 disposed in parallel with the upper sides of substantially horizontal tubes and having a plurality of water discharge holes 17 for uniformly supplying water to the outer surfaces of the fins 3 and the tubes 5, and water transmission means 13 for feeding water into the pipes 9, wherein the supply of the water from the holes 17 of the pipes 9 is limited to the small quantity of the degree for expediting the evaporation of the water from the outer surfaces of the fins 3 and the tubes 5.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a heat exchange device.

[0002]

2. Description of the Related Art In a conventional outdoor heat exchanger such as an air conditioner or a chiller, as shown in FIG. 5, a tube 55 having a plate-shaped fin 53 on each side of a box-shaped main body 51 has a trombone shape. It is provided (only one surface is shown), and the blower fan 57 on the upper surface of the main body operates to allow the outside air to pass through the outer surface of the tube to cool the refrigerant flowing inside the tube.

[0003]

However, the above-mentioned conventional device is not efficient because heat exchange is performed only by heat transfer with the atmosphere (heat radiation by the fins 53), and in order to improve its capacity, air blowing is required. There are inconveniences such as high output of the fan 57 and large size of the device. Therefore, it is an object of the present invention to provide a rational and economical heat exchange device which is excellent in heat exchange efficiency and can be downsized, energy-saving, and low in noise.

[0004]

In order to solve the above-mentioned problems, the present invention provides a heat exchange device for cooling a refrigerant flowing inside a tube, which is formed by arranging tubes having fins in a trombone shape. A water sprinkling pipe, which is arranged parallel to the upper side of the substantially horizontal tube portion, and which has a plurality of water discharge holes for uniformly supplying water to the outer surface of the fin and the tube, and a water supply means for sending water into the water sprinkling pipe. , And limiting the amount of water supplied from the water outlet of the sprinkler pipe to a small amount that promotes evaporation of water from the outer surfaces of the fins and tubes.

Preferably, the outer surfaces of the fins and tubes are formed with slits having a predetermined pattern so that the water supplied thereto is evenly distributed. Further, preferably, it further includes control means for starting the supply of water when the ambient temperature reaches or exceeds a predetermined value.

[0006]

The water supplied to the fins and the outer surface of the tube from the water discharge hole of the sprinkling pipe is limited to a small amount, and the evaporation of the water from the outer surface of the fin and the tube is promoted. To be done. The fins and the slits formed on the outer surface of the tube ensure a good and even distribution of the supplied water.

The control means can start the supply of water when the ambient temperature exceeds a predetermined value, and can satisfy various market demands.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic configuration diagram of an embodiment of a heat exchange device according to the present invention, and FIG. 2 is a diagram showing a main part of this embodiment.
Referring to these drawings, the heat exchange device of the present embodiment has a box-shaped main body 1, and each side surface (only one surface is shown) of
A tube 5 having flat plate-shaped fins 3 is arranged in a thrombon shape (only one surface is shown). The refrigerant flowing into the inside from one end (for example, the lower side) of the tube 5 and flowing out from the other end (the upper side) is the outside air that is moved by the operation of, for example, four blower fans (not shown) on the upper surface of the main body of the fins 3. And, it is cooled by the heat radiation effect when passing through the outer surface of the tube 5.

A plurality of water sprinkling pipes 9 (four in FIG. 1) are arranged in parallel between the substantially horizontal tube portions (see FIG. 2), and these water sprinkling pipes 9 are integrated into one on the upstream side. It is connected to a flow path 15 from a water source (water supply means) 13 via a flow control valve 11 (see FIG. 3). The water source may be a water supply (utilizing water pressure) or a water storage (utilizing hydrostatic pressure) tank provided on the roof of the building or the like, but a device such as a pump (not shown) may be provided separately. Good.

On the lower surface side of the sprinkling pipe 9, a plurality of water outlet holes 17 having a predetermined inner diameter are formed at predetermined intervals, and water is dropped and supplied from the water outlet holes 17 to predetermined portions of the fins 3 and tubes 5. . This water supply is
A thick water layer is formed on the outer surfaces of the fins 3 and the tubes 5, so that evaporation of water is less likely to be transmitted to the refrigerant (which is hindered).
Therefore, it is necessary to limit it to a small amount so that evaporation of water from the outer surfaces of the fins 3 and the tubes 5 is not hindered as much as possible. As a concrete image, it is ideal that the outer surfaces of the fins 3 and the tubes 5 are slightly evenly moistened so that evaporation can be remarkably promoted.

In order to form and maintain such a state, the opening degree of the flow control valve 11 is appropriately adjusted,
Alternatively, or in addition to this, the inner diameter of the water discharge hole 17 is designed (determined) to have an appropriate size.
According to the configuration of the present embodiment described above, in addition to the heat radiation effect by the mere fins, the heat conduction of the vaporization heat due to the evaporation of water is effectively added, that is, the heat transfer from the outer surface of the fin 3 and the tube 5 to the outside is remarkable. The heat is promoted and the heat is largely removed from the refrigerant, so that the total amount of heat exchange is significantly increased, and the heat exchange efficiency can be dramatically improved. Also,
From another aspect, it is possible to reduce the size of a blower fan (not shown) or the size of the entire device, as compared with the case of cooling (radiating) only air, which can improve the heat exchange efficiency.

The outer surfaces of the fins and the tubes may be provided with slits of a predetermined pattern so that the water supplied thereto is evenly distributed (in other words, the water is distributed all over by the capillary phenomenon). Specifically, as illustrated in FIG. 3, the V-shaped grooves 3 a, 5 are formed in the fin 3 and the tube 5.
A plurality of a's may be formed. The groove 3a on the fin 3 is relatively shallow because the groove 3a at the center of the fin 3 is relatively shallow, in consideration of the water transmission system that falls directly down the fin 3 or once through the tube 5 and drops downward. The grooves 3a on both sides of the fin may be relatively deep. Alternatively,
As shown in FIG. 4, in addition to the small semicircular groove 3b, a large semicircular protruding portion 3c may be provided on the surface of the fin 3.

In order to meet various market demands, for example, a temperature sensor (not shown) for detecting the outside air temperature is provided, and the detected value by this is compared with a predetermined set value, and the former exceeds the latter. In such cases (for example, during high temperature in summer)
In addition, it is conceivable to provide an electric circuit (control means) for controlling the flow control valve 11 of the sprinkling pipe 9 to start the supply of the water (further, control the optimum amount of water). The control of the flow rate control valve 11 may be 0-1 control, or may be configured to perform analog control by comparison with a set value or feedback control. With this configuration, the heat exchange amount of the heat exchange device in the summer can be remarkably increased, and since the water supply is controlled at the outside air temperature, it is possible to prevent the device from freezing in the winter.

Alternatively, in addition to the outside air temperature detecting sensor, a temperature sensor (not shown) for detecting the refrigerant temperature is provided, and the detected values are compared with predetermined set values, respectively, and a blower fan (see FIG. It is also conceivable to provide an electric circuit (control means) that can change the operation (rotation speed) of the motor (not shown). In this way, if the rotation speed of the blower fan is controlled at the same time, considerable energy saving can be realized by configuring the fan to operate at the maximum rating for only a few days in the summer, and the blower fan can be operated in a supercooled state. It is possible to reduce the power consumption and noise by reducing the rotation speed. To lower the rotation speed of the blower fan, set a predetermined value,
It may be configured to be mechanically lowered based on this, or may be lowered by feedback control. Further, stepwise rotation speed control or analog control may be used.

[0015]

As described above, according to the present invention, it is possible to make good use of evaporation of water, to have excellent heat exchange efficiency, and to reduce the size of the device, save energy, reduce noise, etc., which is rational and economical. Heat exchanger can be realized.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of an embodiment of a heat exchange device according to the present invention.

FIG. 2 is a diagram showing a main part of this embodiment.

FIG. 3 is a perspective view of a main part of a fin and a tube in which grooves are formed.

FIG. 4 is a top view of a fin having an irregular shape.

FIG. 5 is a perspective view showing a conventional structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main body 3 ... Fins 5 ... Tube 9 ... Sprinkling pipe 11 ... Flow control valve 13 ... Water source 15 ... Flow path 17 ... Outlet hole

Claims (3)

[Claims] 1. A heat exchange device for cooling a refrigerant flowing inside a tube, wherein the tube (5) having fins (3) is arranged in a thrombone shape, and the tube is parallel to the upper side of a substantially horizontal tube portion. A water sprinkling pipe (9) provided with a plurality of water discharge holes (17) for uniformly supplying water to the outer surfaces of the fin (3) and the tube (5), and inside the water sprinkling pipe (9) The water supply means (13 etc.) for sending water to the, and the water supply from the water discharge hole (17) of the sprinkling pipe (9),
A heat exchange device, characterized in that the fins (3) and the tubes (5) are limited to a small amount to promote evaporation of water from the outer surfaces. 2. The fins (3) and the tubes (5) are formed with slits (3a, 5a, etc.) having a predetermined pattern on the outer surfaces of the fins (3) so that the water supplied thereto is uniformly distributed. The heat exchange device according to claim 1. 3. When the ambient temperature exceeds a predetermined value,
The heat exchange device according to claim 1, further comprising control means for starting the supply of water.