JP2001050691A - Spray type plate fin tube heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for eliminating loss when a plate fin tube type heat exchanger is employed in a spray type evaporation cooler and wetting the fins sufficiently while saving energy. SOLUTION: A plate fin tube type heat exchanger 1 is installed while inkcling such that the air speed is balanced with the gravitational speed of water flowing on the surface of fins 2. The fin 2 at the upper corner is bent at a predetermined angle such that the water 5 sprayed from an upper spray trough 4 does not leave the fin 2 at the upper end part to fly out of the heat exchanger but flows down along the edge of the fins without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water spray type heat exchanger used for a condenser for a refrigerator and a water cooler.

[0002]

2. Description of the Related Art A plate fin tube heat exchanger conventionally used as a condenser or a water cooler of a refrigerator is used in an air-cooled system due to its structure. Spraying is installed with a spray device.

In the case of the air-cooled type, the refrigerant is cooled by the sensible heat of the outside air, so that the condensation temperature of the refrigerant or the temperature of the cooling water always becomes higher than the temperature of the air outlet. Because it can be cooled with the latent heat of watering, the condensation temperature of the refrigerant, or the temperature of the cooling water can be cooled to a temperature lower than the air outlet temperature, and even lower than the air inlet temperature if the humidity is low, but to spray watering, A method such as using a high-pressure nozzle or guiding with high-pressure air is required, which requires a large amount of power.In addition, if the high-pressure nozzle is easily clogged, and if the spray is too fine, it will pass through without contacting the fins. There was a problem that the sprayed water was wasted, and it was not practical.

[0004]

The present invention improves this point and provides a water spray type plate fin tube heat exchanger which does not require much power and does not cause problems such as clogging. That is, as described in the claims, the upper end portion of the air inlet side of the fins whose surfaces are arranged substantially perpendicularly and parallel to each other is bent at a fixed angle so as to be in contact with the bent portion of the adjacent fin, Water is allowed to flow down to the upper end of the plate fin tube heat exchanger from the upper sprinkler gutter so that the lower part of the fin tube heat exchanger is shifted to the air downstream side.

[0005] This makes it possible to wet the entire fin with watering with little power consumption.

[0006]

[Function] Many attempts have been made to wet the entire fin by pouring water on the upper surface of the fin and flowing the surface by gravity.
As it flows downward, it is deflected in the downstream direction of the air under the influence of the velocity of the air, and the air inlet side is in a dry state. Although this dry state can be solved, a part of the water spray at the upper end portion does not flow out along the fins but jumps out of the fins, so that a large amount of water spray is wasted.

In the present invention, the plate fin tube heat exchanger is configured as described in the section of the means for solving the problems, so that the entire fin is wetted in balance with the wind speed by appropriately setting the inclination angle. The water flowing down to the upper end portion is forced to flow along the edge of the fin due to the bent portion of the fin, and does not jump out to the air upstream side of the inclined fin, and effectively wets the fin.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a conventional plate-fin tube heat exchanger 1,

FIG. 2 shows a state in which the fin 2 at the upper end on the air inlet side of this conventional plate fin tube heat exchanger is bent at a certain angle, and the lower part 3 of the heat exchanger is inclined so as to be shifted downstream of the air. Is shown.

[0009]

[Fig. 3]

A sprinkler gutter 4 is provided above the plate fin tube heat exchanger 1 of FIG. 2 so that the sprinkler 5 flows down from above the plate fin tube heat exchanger 1.

The sprinkling water 5 flowing out from the sprinkling gutter 4 by gravity is bent at the upper end portion on the air inlet side so that the adjacent fins 2 are bent.
The flow direction is regulated by the ends of the fins 2 in contact with each other, so that they flow along the edges of the fins without jumping out from the edges of the fins 2.

The flowing water having a certain thickness on the surface of the fin 2 spreads to the downstream side of the air under the influence of the air velocity, and reaches the entire surface of the fin 2 by an appropriate inclination and a balance between the flow velocity of the air. The water spray flowing on the surface of the fin 2 receives heat from the fin and evaporates into the air, and a part of the water is lost. The remaining water is collected again, pumped up to the upper end, and circulated down again from the water spout.

[0012]

As described above, the fins can be satisfactorily provided by a small pump power that only pumps water by the height of the plate fin tube heat exchanger as compared with spraying water from a conventional high pressure nozzle. Wet and no water is wasted. As a result, even when the evaporative cooling is performed by spraying water and cooling is performed using the same outside air, the condensation temperature of the refrigerant or the outlet temperature of the cooling water can be significantly reduced as compared with the air-cooled type, and the efficiency of the cooling device can be increased.

[0013]

[Brief description of the drawings]

FIG. 1 is an upper end portion of a conventional plate fin tube heat exchanger.

FIG. 2 shows the upper end of a plate-fin tube heat exchanger according to the invention.

FIG. 3 is an illustration of a plate fin tube heat exchanger according to the present invention with a sprinkler gutter on top.

[Explanation of symbols]

 1. Plate fin tube heat exchanger 2. Fins 3. 3. Below the heat exchanger Sprinkler gutter 5. Watering

Claims (1)

[Claims] In the plate fin tube heat exchanger, the upper ends of the fins whose surfaces are arranged substantially vertically and parallel to each other are bent at a fixed angle so as to be in contact with the bent portions of adjacent fins so that the plate fin tube heat A water spray plate fin tube heat exchanger that slopes so that the lower part of the exchanger is shifted to the downstream side of the air and sprays water by gravity from the water spray gutter provided at the top.