JP3003859B1 - Heat exchange coil for air conditioner - Google Patents

Abstract

[Summary] [Purpose] To maximize the heat exchange efficiency,
Obtain a heat exchange coil that is easy to pipe and assemble. A fin group is divided in a half circumference, and a header 3 is provided one by one in each of one divided gap and the other divided gap. The heat transfer tubes 2 are separately inserted into the pair of divided fin groups 1 and 1, and the headers 3 and 3 and the respective heat transfer tubes 2 are connected and connected in parallel so that the heat medium is divided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange coil for an air conditioner.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a heat exchange coil for an air conditioner such as a four-way blowout fan coil unit has a heat transfer tube in which the entire coil is annular and a heat medium surrounds the entire coil. Was provided.

[Problems to be solved by the invention]

However, in such a structure, the heat medium flow path becomes long and the heat exchange efficiency of the coil is poor, and the options of the effective length of the heat transfer tube, the flow rate of the heat medium, and the number of flows are limited. It couldn't be pulled out to the maximum and was wasteful.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a heat exchange coil having a substantially annular shape, in which a fin group is divided by a half circumference, and one of the divided gap portions is provided. A header is provided one by one in the other divided gap portion and opposed to each other, and a heat transfer tube is separately inserted into a pair of divided fin groups. The medium was configured to diverge. Further, the heat transfer tube was an elliptic tube.

[0005]

FIG. 1 illustrates a heat exchange coil for an air conditioner according to the present invention. The heat exchange coil has a substantially annular shape as a whole, and a fin group is divided by a half circumference. The header 3 is provided one by one in each of the divided gap portion and the other divided gap portion, and the heat transfer tubes 2 are separately inserted into the pair of divided fin groups 1, 1. The heat transfer tubes 2 are connected and connected in parallel so that the heat medium is divided. 3 and 4 illustrate an air conditioner using the heat exchange coil of the present invention.

As shown in FIG. 1, a divided fin group 1 is composed of a number of plate fins 4, 4. The heat transfer tube 2
A plurality of rows are formed so as to meander in the row direction (ventilation direction A) so as to have a counter flow.
The heat transfer tubes 2 are provided in a plurality of stages, the leeward opening ends of the heat transfer tubes of each stage of each split fin group 1 are connected to the heat medium inlet side header 3, and the heat transfer tubes of each stage of each split fin group 1 The windward open ends are connected to the heat medium outlet side header 3 to optimize the heat exchange efficiency. The heat medium enters from one of the headers 3 and exits to the other. Meanwhile, the heat medium passes through the inside of the heat transfer tube 2, and through this heat transfer tube 2 and the divided fin group 1, the coil ventilation air is
The heat is exchanged with the heat of the heat medium, and the air becomes cold wind or warm wind. Sign A
The arrow indicated by indicates the ventilation direction of the blower (not shown).

As shown in FIG. 2, the heat transfer tube 2 is formed into an elliptic tube having a radially cut surface in an elliptical shape, and the long axis of the ellipse of the heat transfer tube 2 is made substantially parallel to the ventilation direction A. Since the cross section of the heat transfer tube 2 is formed in an elliptical shape having a small shape drag, the ventilation resistance is smaller and the pressure loss is reduced as compared with the case of the circular heat transfer tube, and the contact area of the heat transfer tube 2 with the air flow ( (Heat transfer area)
And the amount of heat transfer / exchanged heat is increased by using a counter flow. In the present invention,
The major axis of the ellipse is a straight line that passes through both end points (vertexes) of the major axis of the ellipse.

Although the dashed line arrow in FIG. 1 indicates the direction in which the heat medium flows, the direction in which the heat medium flows can be freely changed. Further, the number of stages and rows of the heat transfer tubes 2 can be increased or decreased, or the number of flows such as single or double can be freely changed, and the entire coil is formed in a substantially rectangular ring shape.

[0009]

According to the first aspect of the present invention, the effective length of the heat transfer tube, the flow rate of the heat medium, and the number of flows can be broadened, and the heat exchange efficiency of the coil can be reduced without wasting as compared with the conventional heat exchange coils having the same number of rows. You can get the most out of it. For example, when the heat medium flow rate of the entire coil is the same as the conventional one, the coil capacity is increased, and when the heat medium flow rate is the same as the conventional one, the coil can be made compact and the running cost of the pump can be reduced.
Local heat exchange unevenness is eliminated, and heat can be uniformly exchanged throughout the coil. Since the two headers 3 are provided at different places, the installation space is large, the piping and assembly are easy, the cost can be reduced, and the coil can be prevented from becoming large. According to the second aspect of the invention, the pressure loss is reduced, and the heat transfer and exchange heat are improved.

[Brief description of the drawings]

FIG. 1 is a simplified plan view showing one embodiment of a heat exchange coil of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a perspective view of an air conditioner using the present invention.

FIG. 4 is a sectional view of FIG. 3;

FIG. 5 is a simplified plan view showing a conventional example.

[Explanation of symbols]

 1 split fin group 2 heat transfer tube 3 header A ventilation direction

Claims (2)

(57) [Claims] 1. A heat exchange coil having a substantially annular shape as a whole, in which a fin group is divided by a half circumference, and one header 3 is opposed to each of one divided gap portion and the other divided gap portion. The heat transfer tubes 2 are separately inserted into the pair of divided fin groups 1 and 1 and the headers 3 and 3 and the heat transfer tubes 2 are connected and connected in parallel to divide the heat medium. A heat exchange coil for an air conditioner, comprising: 2. The heat exchange coil for an air conditioner according to claim 1, wherein the heat transfer tube 2 is an elliptic tube.