WO1995009337A1

WO1995009337A1 - Tubular radiators at high heat exchange capacity

Info

Publication number: WO1995009337A1
Application number: PCT/IT1994/000141
Authority: WO
Inventors: Giorgio Amatucci
Original assignee: Eta S.R.L.
Priority date: 1993-09-30
Filing date: 1994-08-31
Publication date: 1995-04-06
Also published as: IT1270338B; ITAP930002A1; AU7663794A; ITAP930002A0

Abstract

A tubular radiator is made of radiant sections provided with several heat exchanger surfaces, internal and external (2, 3), having the flow of water in their inside. The invention permits, unlike the tubular radiators on the market at the present time, to have a greater heat exchange efficiency and it is realised with lower production cost, besides the energy lost during the transient state (starting/stopping of the system) is reduced to the minimum this because the amount of water contained in each radiant element is no more the function of the area in the profile section of the pipe.

Description

Tubular radiators at high heat exchange capacity

DESCRIPTION

This invention relates to a tubular radiator made of radiant elements composed of several heat exchanger surfaces, internal and external, having the flow of water in their inside. As it is well-known, the working of radiators for industrial and domestic heating systems occurs through a heat exchange which takes place through their own surfaces, between the hot water, flowing in their inside, and external air. Radiators made of steel are known as well, they are constructed by welding together tubular elements in which the main heat vector fluid (hot water) fills completely the radiant pipes in their inside.

Such way of construction is expensive and involves the following problems: the heat exchange capacity is proportional to the radiant surface of the radiator, which in its turn is proportional to the radius of the pipe section (or to the medium radius in case of non-circular pipes); since the volume is proportional to the square of the aforesaid radius, it stands to reason that it is not possible to increase the heat exchange surface of each element except within limits, as it is necessary to limit the volume of the water in the circuit even for heat efficiency reasons: as a matter of fact the greater the water amount in the circuit is the greater the necessary energy for the system working is, and such energy is released by radiators at lower temperature, thus reducing the exchange efficiency; the rise in time for reaching the working rate and for cooling the heating system can trouble the user that will have to wait long from the starting of the system tothe reaching of the desired the thermic standard conditions; the thermic standard is reached by the present tubular radiators, without occupying much space, by several pipes perpendicular to the radiant wall, joint together in their extremity where the manifolds for the flow of the main heat vector fluid are placed; however, in this case, because of the geometry of such joint pipe disposition the exchange efficiency gets worse, either for the closeness of the surfaces or for the air flow among these pipes which is obstructed by the aforesaid manifolds, thus preventing the air from circulating in a proper way around the walls, a basic physical state for a right heat exchange; such construction technique involves an increases in its production cost because of the subdivision into several elements of the exchange surface.

The radiator produced at the present time suceed in having a small amount of water and large heat echanger surfaces but they have also a low efficiency and high production cost.

The solution which form the object of this invention overcomes all the foresaid problems and allow to utilise in a rational and better way a tubular radiator, regarding the saving of the production cost and of the operating expenses of the thermic plant needed to reach the working rate of the system according to the desired thermic standards.

A first aim of the present invention is to provide tubular radiators for heating systems in which the heat exchange is as efficient as possible, realised with lower production cost and in which the energy lost during the transient state (starting and stopping of the thermic plant) is reduced to the minimum.

This and other aims have been achieved according to the present invention through a radiator having the following characteristics:

The first characteristic is that each element of the radiator comprises two or more tubular walls of any form and size, of which one is external and the others are inserted into the first, said walls being so fixed as to permit the flow of the main heat vector fluid into the interspace of the pipes and to permit the internal ones to be crossed by the air; in such a way the amount of water contained in each radiant element is no more the function of the area in the profile section of the pipe, then it is no more necessary to resort to the stratagem producing several columns perpendicular to the radiant wall, as it is possibile to increase as one pleases the external surface of each pipe without contraindication; The second characteristic of the present invention is that making use even of the internal surfaces the heat exchange surfaces of each pipe results augmented thus favouring the ratio (released energy) / (space occupied) , which also reduces the production cost per heat exchanger surface .

The third characteristic is that the exchange surface are more efficient and infact, on the same terms, the radiator produced according to this invention has an internal exchange surface the thermal flow of which can not be damaged by the one of the other surfaces.

The fourth characteristic is that it is possible to produce pipes of any form and size with undeniable aesthetic advantages.

Preferred embodiments of the radiators according to the invention have further been given the characteristics that can be seen from the subclaims. A preferred embodiment of the invention will be described by way of example more closely below with particular reference to the enclosed drawings, in which:

Fig.l is an assonometric view of a preferred embodiment of a radiant module realized according to the present invention;

Fig.2 is a cross elevation section view according to line II-II of fig.l, showing the structure of a radiant element;

Fig.3 is a longitudinal section view according to line III-III of fig.l, it also showing the structure of a radiant element;

Fig.4 is a schema of connections between the radiant modules of a radiator;

Fig.5 is a cross section elevation view of a second embodiment of the invention;

Fig.6 is a cross section elevation view of a third embodiment of the invention;

Fig. 7 is a front elevation view of a fourth embodiment of the invention; Fig.7a is a top plane view of the embodiment of fig.7; Fig.8 is a front elevation view of a further embodiment of the invention.

Fig.9 is a longitudinal section view of the radiator shown in Fig.8. The Figure 1, that represents the axonometry of this invention and the Figures 2 and 3, representing the longitudinal sections, show a first possible way to realise this invention.

This modular radiator 7 for heating systems is realised with tubular radiant elements composed of a double heat exchanger surface, external and internal, having the flow of water among them, including essentially: manifold 1 placed at the top and at the bottom of the radiant pipes; radiant elements, including external and internal pipes 2,3, which are the one next to the other and joint at their extremity to the manifolds 1 .

In conformity with the present invention, the heating water is piped into the interspace of the radiant pipes 2, 3 throughout the manifold 1.

Each radiator is formed by a plurality of module 7 which can be joint to the contiguous one by nipples in the extremity of each manifold 4. The external air passes through the pipe notch receiving the heat from the water which flows into the interspace of the radiant pipes 3.

As can be seen in Figs. 5 and 6, manifolds can be connected according to the invention to the sides of the • radiating elements rather than to the ends thereof. Fig. 5 shows an embodiment of the invention with the manifold connected to the sides of one set of radiating elements.

In Fig. 6 the manifolds are located between two parallel sets of radiating elements.

Another embodiment of the present invention shown in Figs. 7 and 7a comprises a radiator consisting of several air pipes 3 inserted into one outer pipe 2.

Still another embodiment of the present invention is shown in Figs. 8 and 9 where the tubular elements 2 and 3 are cylindrical and not coaxial. Actually the section is essentially rectangular and the inner pipe 3 has only its central part coaxial to the outer pipe 2, while its ends are apart from the axis to provide side outlets 6, in addition to the axial outlets, for the air flowing into pipe 3. Thus the hollow space for water between the outer and the inner radiating pipes 2 and 3, respectively, extends over the whole length of only three sides of the radiator, while it extends over only the central portion of the fourth side. At the upper and lower sides of the radiator there are provided two outlets through which the air of the room can move into and out of a side of the radiator.

A last but not less important feature of the latter embodiment is that the function of manifolds 1 is efficiently performed by threaded connecting elements 5.

It should be further appreciated that the invention may also be carried out not only by radiators consisting of several pipes which can be connected to one another but also by monolithic radiators.

The present invention has been illustrated and described according to some preferred embodiment thereof but it should be understood that construction modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. Modular radiant element for thermal vector fluid radiator, characterized by the fact that said modular radiant element comprises at least one tubular radiant element formed by pipes (2) , (3) placed the one into the and other, and fixed one another and with manifolds (1) as to permit the flow of said thermal vector fluid into the interspace of the pipes and to permit the internal one to be crossed by the air.

2. Modular radiant element according to the claim 1, wherein the manifolds (1) are placed at the top and the bottom of the radiant pipes (2,3).

3. Modular radiant element according to the claims 1 and 2, wherein the manifold (1) are joint laterally with the radiant pipes (2,3). . Modular radiant element according to the preceding claims, wherein the manifold (1) are joint to both sides with radiant pipes (2,3).

5. Modular radiant elements according to the preceding claims, caracterized by the fact that it includes one external pipe (2) crossed by a plurality of internal pipes (3) .

6. Modular radiant element according to claim 1, characterized in that the radiant pipes (2, 3) are not cylindrical and are arranged so that the inner radiant pipe (3) communicates with the outer environment not only at the upper and lower ends of the radiator but also at the front side, said outer radiant pipe acting as a manifold (1) connected to threaded connecting elements (5). 7. Modular radiant element according to claim 6, characterized in that the side radiant surfaces of each pipe have a larger width than the radiant surfaces parallel to the plane of the radiator.

8. Radiator realized with modular radiant elements according to the claim 1-7, characterized by the fact that it includes a number of said radiant elements contiguous which are connected to one another by nipples in the extremity of each manifolds (1) .

9. Radiator realized with a plurality of modular radiant elements according to the claims 1-7, but produced in one piece (monolithic) .