JPH10274490A - Plate fin coil - Google Patents

Abstract

(57) [Problem] To provide a plate fin coil capable of increasing the amount of exchanged heat without increasing the number of rows or increasing the fin area of the entire coil. SOLUTION: A plurality of plate fins 1 arranged in parallel in a face-to-face relationship, and a plurality of straight pipes 3 inserted in a plurality of stages and a plurality of rows orthogonal to the face-to-face facing portion 2 of the plate fins 1. …. The straight pipes 3 are connected and connected in a meandering manner in each stage to form a plurality of stages of heat medium flow pipes 4. The fin area per a plurality of rows of the straight pipes 3 is gradually increased from the downstream side to the upstream side of the heat medium passages 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG.
As shown in the figure, the fin area per row or a plurality of rows of straight pipes is constant, and the upstream side of the meandering heat medium flow pipe connecting the straight pipes has higher heat than the downstream side. The temperature difference between the medium and the heat-exchanged air is large, so that the amount of heat exchanged per row or a plurality of rows of straight pipes can be increased on the upstream side of the heat medium flow pipe.

[0003]

However, nevertheless,
Since the fin area (heat transfer area) is the same on both the upstream and downstream sides, the heat transfer area on the upstream side is insufficient and the amount of heat exchange is limited, and the heat transfer area on the downstream side is too small. There was a problem that it wasted bulk. Then, an object of the present invention is to provide a plate fin coil which can solve the above-mentioned problems.

[0004]

In order to achieve the above object, a plate fin coil according to the present invention comprises a plurality of plate fins arranged in parallel in a face-to-face relationship, and a plurality of plate fins perpendicular to a face-to-face portion of the plate fins. A plurality of straight pipes which are inserted in a plurality of stages and a plurality of rows so as to be able to conduct heat in a freely conductive manner. And the fin area per row or a plurality of rows of the straight pipe is gradually increased from the downstream side to the upstream side of the heat medium flow pipe.

[0005]

1 and 2 show a plate fin coil according to the present invention, wherein the arrow indicated by the symbol A indicates the direction of air flow to the coil. The plate fin coil includes a plurality of plate fins 1 arranged in parallel in a face-to-face relationship, and a plurality of straight pipes inserted in a plurality of rows and a plurality of rows orthogonal to the face-to-face facing portion 2 of the plate fin 1. , And the straight pipes 3 are connected to each other in a meandering manner so as to form a plurality of stages of heat medium flow pipes 4.

The ends of the heat medium flow pipes 4 are connected to the heat medium branch / merge headers 5a and 5b. Cold water, hot water, and other various heat mediums enter the flow header 5a and flow therethrough, pass through the heat medium flow conduits 4 of each stage, and merge into the merge header 5b. The fin area (Σ (one side T × side H)) per a plurality of rows (two rows in the illustrated example) of the straight pipe 3 is:
The width is gradually increased from the downstream side to the upstream side of the heat medium circulation pipe 4. For example, the fin area is sequentially increased in proportion to the magnitude of the temperature difference between the air passing through the coil and the heat medium. In the illustrated example, the fin area is changed per two rows, but the number of rows is not limited to this, and may be three rows or more.

In the plate fin coil having the above-described structure, heat is exchanged between the coil ventilation air and the heat medium through the heat medium flow pipes 4 and the plate fins 1. In consideration of the magnitude of the temperature difference between the air passing through the coil and the heat medium, the excess and deficiency of the fin area (heat transfer area) has been eliminated. (The amount of heat flowing through) increases, so that the excess thickness of the fin 1 can be reduced on the downstream side.

Further, if the plate fins 1 are divided into a plurality of parts as shown in the drawing and are arranged at intervals in the ventilation direction A, the coil ventilation air contacts the leading edge of the fins by the number of divisions to generate a vortex, Since the leading edge (edge) effect is obtained, the overall heat transfer coefficient and heat transfer coefficient are increased as compared with the undivided one, resulting in a high-performance coil.

The present invention is not limited to the above-described embodiment, and the design can be freely changed without departing from the gist of the present invention. Although not shown in the drawings, the fin area per row of the straight pipe 3 may be gradually increased from the downstream side to the upstream side of the heat medium passage 4. Furthermore, the number of rows and the number of stages of the straight pipe 3 and the number and pitch of the fins 1 can be freely increased and decreased.
The plate fins 1... Do not have to be divided into a plurality of parts at intervals in the ventilation direction A. The heat medium in the pipe 4 has a countercurrent flowing from the leeward side of the coil ventilation air to the leeward side, but may have a parallel flow flowing from the leeward side to the leeward side.
It is also possible to freely form the fin 1 with a cut-and-raised slit or a dimple for increasing the heat transfer coefficient and other various shapes.

[0010]

According to the present invention, the fin area on the downstream side is reduced so that the fin area of the entire coil does not increase more than before.
By increasing the fin area on the upstream side by that amount,
The amount of heat exchanged (coil capacity) can be increased without increasing the number of rows or increasing the fin area of the entire coil. If the coil capacity is the same as the conventional one, the fin area on the downstream side is reduced without increasing the fin area on the upstream side, so that the fin area of the entire coil is reduced and the size of the coil can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a simplified sectional view of the embodiment.

FIG. 3 is a simplified plan view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate fin 2 Facing surface 3 Straight pipe 4 Heat medium flow pipe A

Claims (1)

[Claims] 1. A plurality of plate fins 1 arranged in parallel in a face-to-face relationship, and a plurality of straight pipes which are inserted in a plurality of rows and a plurality of rows perpendicular to the face-to-face facing portions 2 of the plate fins 1. And connecting the straight pipes 3 so as to form a meandering shape at each stage to form a plurality of stages of heat medium flow passages 4. A plate fin coil wherein the fin area per row is gradually increased from the downstream side to the upstream side of the heat medium flow pipes 4.