ES2349991B1 - PERFECTED HEAT SINK FOR SOLAR COLLECTORS. - Google Patents

Abstract

Heat sink improved for solar collectors. # Heat sink incorporated into the Solar Collector, consisting of an evaporation chamber (2) in contact with the absorbent plate (7) that is connected by a dissipation tube (4) to another chamber of condensation (1). The evaporation chamber contains water (10) inside, which allows the heat accumulated in said collecting tube (3) to dissipate through the change of state that occurs in the water (10) of the evaporation chamber (4) . As steam is produced, it condenses in the condensation chamber, which prevents the temperature of the steam from rising and thus it is possible to limit the temperature of the water inside the heat-carrying tubes (6) and collecting tube ( 3).

Description

Heat sink perfected for solar collectors.

The present invention relates to an improved heat sink for solar collectors, of those described in the main patent P200700355, which allows to achieve a lower thermal resistance in the process of dissipating excess heat for Solar Collectors.

State of the art

In every solar collector, there is the problem of the well-known "ESTANCAMIENTO". When the energy captured by the collector is not used in the secondary circuit because there is no hot water consumption, solar energy produces an increase in the collector's water temperature above its normal working point, reaching the water, which is at the tubes of the solar collector, a temperature higher than 150ºC which is harmful for the Solar Installation. This phenomenon is known as STAGING.

Stagnation is particularly problematic in climates with higher ambient temperatures and with more hours of sunshine.

One of the solutions offered in the market to solve this problem of STAGING, is to use more resistant materials, which leads to the consequent increase in cost. The possibility of arcing the glass plate to produce self-cooling is also offered, but this is not sufficiently effective. Another option is to incorporate a cooling valve that diverts the water from the primary circuit to another circuit that is cooled by forced ventilation by a wind turbine, but in this way the number of parts and space that the assembly occupies and the cost are increased of the team.

The present invention aims to offer a novel solution to the above-mentioned problems by offering the possibility of incorporating a coupled device inside the solar collector that allows heat dissipation to prevent the temperature from rising more than is due or desired, with a low cost and without increasing the space occupied by the whole. It is also an improvement of the device described in the main patent P200700355 since it manages to reduce thermal resistance much more, since the boiling chamber is in direct contact with the absorbent plate and the condensation chamber has a greater contact with the back plate, greatly increasing the dissipation capacity. The basis of the main patent is based on the incorporation into the Solar Collector of an evaporation chamber, which is connected to a condensation chamber by silicone tubes that have a thermal valve inside. With this system it is possible to dissipate the heat by change of state (vaporization) and decrease the temperature of the collecting tube, which contains the hot water, when the stagnation phenomenon occurs.

Description of the invention

The present invention relates to an improved heat dissipation device, of those described in the main patent P200700355, which costs an evaporation chamber, a dissipation tube and a condensation chamber.

The main advantages of the present invention are, on the one hand, the low cost and simplicity of manufacture. On the other hand, it is possible to control the excessive temperature rise of the collector tube without the need to incorporate any type of external equipment to the solar collector box, considerably reducing the thermal resistance by including several heat dissipation devices inside the solar collector in which the evaporation chamber of each of them is in contact with the absorbent plate and between each two heat transfer tubes.

The water in the boiling chamber is in contact with the absorbent plate that will be heated by the operation of the equipment when the sun shines. Part of the water in the evaporation chamber of each of the devices will pass into steam. The heat transferred to the water, to make the change of state, will limit the temperature of the absorbent plate and therefore the temperature of the heat-carrying tubes and that of the collecting tube, in the vicinity of 100 ° C, while there is liquid water in the evaporation chamber . In the condensation chamber, the water vapor returns to the liquid phase giving the heat of change of state to the atmosphere, through the back plate of the solar collector.

To complement the foregoing description and in order to help a better understanding of the features of the invention, a detailed description of a preferred embodiment will be made, based on a set of drawings that accompany this specification and where For information purposes only and not limitation, the following has been represented:

Figure 1 shows a schematic side view of the solar collector with the solar heatsinks.

Figure 2 shows an II-II view of Figure 1.

In the previous figures the numerical references correspond to the following parts and elements.

one.

Condensing chamber

2.

Evaporation chamber

3.

Collecting tube

Four.

Silicone dissipation tube.

5.

Thermal valve.

6.

Heat transfer tube.

7.

Absorbent Plate

8.

Tempered glass

9.

Rock wool

10.

Water.

eleven.

Back plate.

Detailed description of a preferred embodiment

The invention consists, as seen in Figures 1 and 2, of various heat dissipation equipment inserted inside a solar collector, each formed by an evaporation chamber (2), which is a hollow cylinder, of diameter of the base about 10 cm and about 3 cm generatrix, inside which there is a certain amount of water (10) sufficient to produce heat dissipation and which is glued by one of the cylinder bases to the absorbent plate (7). The evaporation chamber (2) is connected to a dissipation tube (4) with silicone walls, through which the water vapor produced by the heat transfer of the absorbent plate (7) rises to the water (10) of the vaporization chamber (2), and by which the condensed water vapor also descends due to the operation of the condensation chamber (1) which is another hollow cylinder with a base diameter greater than its generatrix, which is attached to the back plate (11) by one of its bases. The walls of the dissipation tube (4), being silicone, do not act as a thermal bridge when the solar collector operates within its working temperature. The walls being elastic, these tubes admit the small variations in pressure that can be produced and facilitate the assembly process.

The solar collector, like all known in the market, consists of a series of heat transfer tubes (6) through which the water is circulated. When passing through the tubes, the water will be heated by the solar radiation that reaches the absorbent plate (7), through the tempered glass (8), both separated by an air chamber. The absorbent plate (7), by contact, transmits the thermal energy to the heat transfer tubes (6). Rock wool (9) insulates the equipment from the outside, delimited by the back plate (11). The heated water arrives at the upper collecting tube (3) to be subsequently sent outside to, through a heat exchanger, transfer the solar thermal energy to the secondary consumption circuit.

The absorbent plate (7), by contact, transmits the thermal energy to the heat transfer tubes (6). To ensure the proper functioning of the heat dissipation equipment, a thermal valve (5) is added to each dissipation tube

(4)

of the dissipative device, which allow heat dissipation when the water temperature (10) reaches 100 ° C and prevents such dissipation from occurring, when said temperature is around 60 ° C. When the water reaches 100 ° C it is when the evaporation chamber (2) of the heat dissipation equipment acts, transmitting the excess heat to the evaporation chamber (2), producing the evaporation of the water (10) contained in the chamber evaporation

(2)

for subsequent condensation on the condensation plate (1), so that the heat is finally transmitted to the outside. In this way it is achieved that the water temperature of the heat transfer tubes (6), as well as the collection tube (3) never exceeds 100 ° C.

There are other variants of solar collector heatsinks, as is the case with different designs, respecting the essentiality of the invention, which we can say will be evident to one skilled in the art.

Claims (8)

one.

Heat sink perfected for solar collectors, consisting of tempered glass, an absorbent plate, several heat transfer tubes and a hot water collector tube, characterized by being inserted inside the solar collector and consisting of an evaporation chamber, in whose interior water has been introduced, and a condensation chamber, both chambers being connected by a dissipation tube.

2.

Improved heat sink for solar collectors according to claim 1 characterized in that the evaporation chamber is in contact with the solar collector absorption plate.

3.

Heatsink perfected for solar collectors according to previous claims characterized in that each evaporation chamber of each heatsink is located between two heat transfer tubes.

Four.

Heatsink perfected for solar collectors according to previous claims characterized in that each heatsink tube contains a thermal valve.

5.

Heat sink perfected for solar collectors according to previous claims characterized in that the evaporation chamber and the condensation chamber are hollow cylinders.

6.

Heat sink perfected for solar collectors according to previous claims characterized in that the condensation chamber is in contact with the back plate.

7.

Heat sink perfected for solar collectors according to previous claims characterized by being, the walls of the dissipating tubes, of silicone.

SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 200800294 SPAIN Date of submission of the application: 04.02.2008 Priority Date: 00-00-0000 REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: F24J2 / 32 (2006.01) F24J2 / 46 (2006.01) RELEVANT DOCUMENTS

Category

Documents cited Claims Affected

X

US 4080957 A (BENNETT CHRISTOPHER JOHN) 03/28/1978, column 5, line 26-column 8, line 15; Figures 1-3. 1,3,5,6,7

Y

4

Y

US 3996919 A (HEPP PETER S) 12/14/1976, summary; claim 1; Figures 1A-3B. 4

X

FR 2544843 A1 (PRUNET JEAN) 10/26/1984, page 7, line 11 -page 12, line 40; Figures 1-7. 1,2,3,5,6,7

X

JP 60099955 A (SHOWA ALUMINUM CO LTD) 06/03/1985, figures & Summary of the EPODOC database. Recovered from EPOQUE. 1,3,5,6,7

X

JP 58069362 A (FUJI DENKI SOGO KENKYUSHO KK et al.) 04/25/1983, figures & Summary of the EPODOC database. Recovered from EPOQUE. 1,3,5,6,7

TO

JP 8042983 A (DIAMOND ELECTRIC MFG) 02/16/1996, figures & Summary of the EPODOC database. Recovered from EPOQUE. Accession number 1996-162926. 4

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been produced • for all claims • for claims no: ALL

Date of realization of the report 19.11.2010

Examiner O. Rucián Castellanos Page 1/4

REPORT OF THE STATE OF THE TECHNIQUE Application number: 200800294 CLASSIFICATION OBJECT OF THE APPLICATION Minimum documentation searched (classification system followed by classification symbols) F24J Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENES, EPODOC State of the Art Report Page 2/4  WRITTEN OPINION Application number: 200800294 Date of Written Opinion: Statement

Novelty (Art. 6.1 LP 11/1986)

Claims 2,3,4,6,7 Claims 1,5 IF NOT

Inventive activity (Art. 8.1 LP11 / 1986)

Claims Claims 1-7 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base.- This opinion has been made on the basis of the patent application as published. State of the Art Report Page 3/4  WRITTEN OPINION Application number: 200800294 1. Documents considered.- The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

US 4080957 A (BENNETT CHRISTOPHER JOHN) 28.03.1978

D02

US 3996919 A (HEPP PETER S) 14.12.1976

D03

FR 2544843 A1 (PRUNET JEAN) 26.10.1984

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement The object of the invention is a heat sink for solar collectors, perfected with respect to the main patent P200700355, in particular a design variation can be considered. The present invention relates to a heat sink for solar collectors consisting of an evaporation chamber in which there is water and a condensation chamber, both of which are connected by a dissipation tube (claim 1), the evaporation chamber is in contact with the solar collector absorption plate (claim 2), and is placed between two heat transfer tubes (claim 3). Each dissipative tube has a thermal valve (claim 4). The evaporation and condensation chambers are hollow cylinders (claim 5). The condensation chamber is in contact with the back plate (claim 6) and the walls of the dissipating tubes are silicone (claim 7). Document D01 is considered the closest in the state of the art to the object of claim 1, and discloses (the references in parentheses correspond to this document): a solar collector (10) inside which an absorption plate (12 ) in contact with several pipes (15) through which water circulates. It also has a hot water collection pipe (40). The collector dissipates heat through an evaporation chamber (51) where water is introduced and a condensation chamber (52), both chambers are connected by one or several dissipation tubes and are hollow cylinders. Therefore, the object of claims 1 and 5 is not new in view of the state of the known art (Article 6.1 of the Patent Law). On the other hand, the fact that the evaporation chamber is located between two heat transfer tubes, that the condensation chamber is in contact with the back plate and that the walls of the dissipating tubes are made of silicone (claims 3, 6 and 7) These are options that an expert in the field could consider as a design option. Therefore, claims 3, 6, and 7 are considered to have no inventive activity (Article 8.1 of the Patent Law). The main difference between document D01 and the object of the invention is that each dissipating tube does not have a thermal valve, an object that is described in document D02, which has a temperature sensitive valve (38). For a person skilled in the art it would be obvious to use the thermal valve disclosed in D02 together with the elements of D01, resulting in the object of claim 4 of the application. Therefore, claim 4 lacks inventive activity (Article 8.1 of the Patent Law) in relation to what is disclosed in documents D01 and D02. With respect to claim 2, it is observed in D03 that the evaporation chamber (tubes 4b) is in contact with the absorption plate (4a) of the solar collector. Therefore, claim 2 also has no inventive activity (Article 8.1 of the Patent Law). State of the Art Report Page 4/4