CS261633B1 - Recuperating heat exchanger - Google Patents

Abstract

The solution relates to a heat recovery exchanger especially for use in refrigeration technology. The exchanger surface is formed individual sections (Si to Saj of tubular snakes (7). Tubular snakes (7) can to be connected to the coolant distributor (4) via distribution pipes (5), whose length is determined by the thermal load respective sections (Si to Saj. Length tubular snakes (7) can be different and is determined by the respective thermal load section. The light diameter of the manifolds may be different tubes (5) depending on the heat load the relevant section.

Description

(54) Recuperative heat exchanger

The present invention relates to a recuperative heat exchanger intended especially for use in refrigeration technology. The surface of the exchanger is made up of individual sections (Si to Saj) of the coil snakes (7). The coils (7) can be connected to the coolant manifold (4) by means of distribution pipes (5). The length of the tubing coils (7) may vary and is determined by the heat load of the section, and the clear diameter of the manifolds (5) may vary depending on the heat load of the section.

281633

The invention relates to heat exchangers-chillers in which the heat load of the heat transfer surface is not uniform and uniform. These are in particular recuperative exchangers, where one working medium is air or gas, which is transported through the exchanger by a fan, which forms one unit with the exchanger. The second working medium is fluids, in particular refrigerants. It is therefore mainly used for air coolers. Structurally, they are usually made up of tubes that are (provided with ribs).

The fluid flow through the exchanger is divided into individual parallel sections to achieve permissible flow resistances. The state of the art is that these sections are shaped equally and regularly.

In the case of a coolant exchanger, in particular in air or gas, where the coolant is a vaporizing coolant, the coolant is fed to the individual sections of the coolant by means of a coolant manifold and capillary tube manifolds. This results in sections where fluid passages are formed by continuous channels, usually tubular snakes, and thus these parallel snakes always have the same number of tubes of the same diameter as the same length and the same clear diameter have the distribution tubes. This regularity, even in the case of the actual coils, is sometimes partially disrupted in gas coolers, especially air, with electric extraction by placing electric heating rods instead of a few tubes of coil.

A disadvantage of these prior art conventional arrangements is that the individual sections of the coolers tend to be thermally unequally loaded, which has a negative effect on their use and performance. The cause of this different thermal load is different and uneven velocity of the cooled substance, mostly air. Sections through which air flows at a higher speed are loaded more, others less. As a result of this, the flow of coolant ducts through the tube snakes of some sections is negatively influenced and hence the aforementioned reduction in the performance of the coolers.

These drawbacks are overcome by the recuperative exchanger according to the invention, which is characterized in that the individual manifolds have a different length, which lengths are determined according to the corresponding heat load. The distribution pipes may have different diameters for each section, depending on the n- and thermal load of the sections.

These measures achieve equalization of the flow resistances in the individual sections and hence an optimum flow of the refrigerant fluid through the sections. The advantages of the solution according to the invention reside in the fact that higher performance is achieved compared to the radiators used hitherto.

An example of the solution according to the invention is shown in the attached figure. It is a fan air cooler with a direct coolant evaporator. The different thermal loads of the individual S sections are caused by different air velocities in these sections. The cooler consists of a heat exchanger 1, a fan 2, a throttle valve 3, a refrigerant distributor 4, a manifold 5 and a vapor collector 6 at the radiator outlet. The exchanger 1 itself is formed by tubular snakes 7, which are provided with ribs. On the side view of the indicated radiator, three cases are indicated.

At the top, with the lengths of tube coils (L i = L _h = _h2 .various' the length of the distributor pipes (L _{R L} 0 L · _I2 &# ....]. Their diameters are equal (d = _R d - 2 = ....).

In the lower part, with the same lengths of manifold tubes (L _r6 = _r7 = ....), different tube lengths (Lh6 Lh ₇₎

The third case is indicated in the upper part, when the same pipe lengths (L _h1 = L _h2 = ....) and the same lengths of the manifolds (L _rJ = L _r2 = ....) change the diameter of the manifolds ( d, id _r2 & In the sections with the highest air velocity, either the shortest manifolds β or the shortest pipe snakes 7, or the smallest diameter of the manifolds 5.

Claims (3)

Subject 1, characterized in that the individual tube coils (7) have different lengths between the respective manifolds (5j) and the vapor collector (6). Recuperative heat exchanger - an air cooler, consisting of individual sections of pipe coils with a common coolant manifold - and a common coolant vapor collector - characterized in that the individual manifolds (5) between the coolant manifold (4) and the respective pipe coils (7) have different length. 2. Recuperative heat exchanger according to item VYNALEZU 3. Recuperative heat exchanger according to claim 4, characterized in that the individual manifolds (5) between the manifold (4) are cooled and the respective pipe coils (7) have a different clear diameter.