JPS5920957B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to various types of condensers that exchange heat between an air flow containing mist and a heat medium having a temperature difference with this air flow, particularly various condensers in which a heat medium in a pipe is condensed, and a condenser for geothermal power generation plants. The present invention relates to a heat exchanger suitable as a heat exchanger.

Conventional mist airflow cooling type heat exchangers have heat transfer tubes (smooth tubes, even tubes) arranged in a staggered manner in the mist airflow path.
It has a structure in which a nozzle is placed upstream of the heat transfer tube and a blower is placed upstream or downstream.

While the blower generates a flow of air in the mist airflow passage, water is injected into the airflow from a nozzle to form a mist airflow, and this mist airflow and the refrigerant vapor passing through the heat transfer tube are condensed.

In such a heat exchanger, the mist from the nozzle collides with the most upstream heat exchanger tube (1st column), up to the second row of heat exchanger tubes, and from the third row downstream. The mist hardly collides with the tube rows.

Therefore, the dry surface of the downstream heat transfer tube becomes wider as it moves downstream, and the heat transfer performance deteriorates.

An object of the present invention is to provide a heat exchanger that has high heat transfer performance and prevents mist from being discharged to the outside of the heat exchanger.

The feature of the present invention is that a mist heat exchange type heat exchanger tube having a mist extension means is arranged on the upstream side of the mist airflow passage, and a forced convection heat exchange type heat exchanger tube consisting of a bifin tube is arranged on the downstream side. be.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

1 and 2 show a first embodiment.

゛Entrance 1. In a case 4 having an outlet 2 and a water receiver 3, heat transfer tube groups 5 and 6 are arranged.

The heat exchanger tube group 5 is a mist heat exchange type heat exchanger tube, and is a heat exchanger tube provided with fins having fine grooves.

In addition to a finned heat exchanger tube with fine grooves, a heat exchanger tube with mist extending means such as fine grooves or holes provided on the surface of the heat exchanger tube to improve wettability may be used.

The heat exchanger tube group 6 is a forced convection heat exchange type heat exchanger tube and is arranged on the downstream side of the heat exchanger tube group 5, and a pie fin tube is used as the tube group 6.

The nozzle 7 is arranged at the inlet 10 and injects water toward the heat exchanger tube group 5.

A pipe 7a and a pump 9 are connected to the nozzle 7, and the water receiver pumps water from the section 3.

The water receiver is separately replenished when the amount of water in section 3 becomes low.

The blower 8 is installed at the outlet 2 (or on the upstream side of the heat exchanger tube group 5) and generates a flow of air from the inlet 1 toward the outlet 2.

Next, the operation of this embodiment will be explained.

A heat medium such as refrigerant vapor flows inside the heat transfer tube groups 5 and 6, and an air current flows outside the tubes from the inlet 1 toward the outlet 2.

The airflow is generated by a blower 8. Water is injected from the nozzle 7, becomes mist in the airflow, mixes, and flows into the heat exchanger tube group 5.

The mist leaks from the surface of the heat exchanger tube group 5 (heat exchanger tubes and fins) to improve cooling performance.

Although the mist often does not reach the heat exchanger tube group 6, it is forcibly cooled by the airflow.

By the time the heat medium leaves the tube groups 5 and 6, most of it has been condensed.

FIG. 3 shows a second embodiment of the invention.

As in the first embodiment, the mist heat exchange type heat exchanger tubes 5 are arranged on the upstream side, and the forced heat exchange type heat exchanger tube group 6 is arranged on the downstream side.

In this embodiment, the upper part of the heat exchanger tube group 5 of the mist heat exchange type is replaced with a heat exchanger tube 9 of the forced convection heat exchange type, since the upper heat exchanger tubes tend to dry out easily.

Each heat exchanger tube 9 has the same configuration as the heat exchanger tube group 6.

As described above, in the present invention, since the heat exchanger tube having the mist extension means is arranged on the upstream side through which the mist airflow flows, the cooling effect of the mist can be sufficiently exerted in the heat exchange section in this area, and In this region, it is possible to arrange a tube with a smaller heat transfer area than a forced convection heat exchange type heat transfer tube.

As a result, in the heat exchange section of the mist heat exchange method,
The heat exchanger tubes can be arranged more densely than in a forced convection type heat exchange section, and the amount of heat exchanged per unit area increases.

In addition, by placing the IF-IN tube with a large heat transfer area on the downstream side where the amount of mist in the airflow is small, it is possible to secure the desired cooling effect. Since it is large, the mist in the airflow can be captured well, and the mist will not be released to the outside of the heat exchanger.

In this way, efficient heat exchange is possible as a whole, and a heat exchanger with high performance can be provided.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a first embodiment of the present invention, FIG. 2 is a detailed view of the main part of FIG. 1, and FIG. 3 is a detailed view of the main part of the second embodiment. 1...Inlet, 2...Outlet, 3...Water tray, 4...
...Case, 5...Mist heat exchange type heat exchanger tube, 6,
9... Forced convection heat transfer tube, 1... Nozzle, 8...
··Blower.

Claims (1)

[Claims] 1 A heat exchange section using a mist heat exchange method that exchanges heat between the mist airflow flowing inside the tube and a heat medium flowing inside the tube, and a heat exchange section using a forced convection method that exchanges heat between the air flow flowing outside the tube and the heat medium flowing inside the tube. A mist heat exchange type heat exchange part is arranged on the upstream side of the airflow passage, and a forced convection type heat exchange part is arranged on the downstream side of the airflow passage, wherein the mist heat exchange type heat exchange part has a mist extension means. 1. A heat exchanger characterized in that a heat exchanger tube having a heat exchanger is disposed, and a forced convection type heat exchange section is disposed with an equalizer tube having an equalizer.