ES2349991A1 - Heat dissipator perfected for solar collectors. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improved heat sink for solar collectors. Heat sink incorporated in the solar collector, constituted by an evaporation chamber (2) in contact with the absorber plate (7) which is connected by a dissipation tube (4) to another condensation chamber (1). The evaporation chamber contains water (10) in its interior, which allows to dissipate the heat accumulated in said collection pipe (3) 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 transfer tubes (6) and the collection pipe ( 3). (Machine-translation by Google Translate, not legally binding)

Description

Improved heat sink for collectors solar.

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

State of the art

In every solar collector, there is the problem of known as "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 collector water temperature above its working point normal, reaching the water, which is in the collector tubes solar, a temperature above 150ºC which is harmful for the Solar Installation. This phenomenon is known as STAGNATION.

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

One of the solutions offered in the market to solve this problem of STAGING, is that of use more resistant materials, which entails the consequent cost increase It also offers the possibility of arching the glass plate to produce a self-cooling, but this does not It is effective enough. Another option is to incorporate a cooling valve that diverts water from the circuit primary to another circuit that is cooled by forced ventilation by a wind turbine, but in this way the number of pieces and space occupied by the set and the cost of the equipment.

The present invention aims to offer a novel solution to the problems presented above offering the possibility of incorporating a device attached to the inside the solar collector that allows heat dissipation to avoid that the temperature increases more than is due or desired, with a low cost and without increasing the space occupied by the whole. Likewise it is an improvement of the device described in the patent main P200700355 since it manages to decrease the thermal resistance, since the boiling chamber is in contact direct 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 a camera evaporation, which is connected to a condensation chamber for about silicone tubes that have a thermal valve inside. With this system is allowed to dissipate heat by change of state (vaporization) and decrease the temperature of the collecting tube, which contains hot water, when the phenomenon of stagnation.

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
sation

The main advantages of this invention are, on the one hand the low cost and simplicity of manufacturing. On the other hand it is allowed to control the excessive ascent of collecting tube temperature without incorporating any type of equipment external to the solar collector box, decreasing considerably the thermal resistance when included, in the inside the solar collector, several dissipating devices of heat in which the evaporation chamber of each of them is in contact with the absorbent plate and between every two tubes heat carriers.

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 collector
solar.

To complement the description above and in order to help a better understanding of the characteristics of the invention, a detailed description of a preferred embodiment, based on a set of drawings that accompany this descriptive report and where with merely character indicative and not limiting the following has been represented:

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

Figure 2 shows a view by II-II of figure 1.

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In the previous figures the references Numeric 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 the Figures 1 and 2, in various heat dissipation equipment inserted inside a solar collector, each formed by a evaporation chamber (2), which is a hollow cylinder, with a diameter of the base about 10 cm and a generatrix about 3 cm, inside which there are a certain amount of water (10) sufficient to produce the heat dissipation and that is glued by one of the bases of the cylinder to the absorbent plate (7). The evaporation chamber (2) It is connected to a dissipation tube (4) with silicone walls, by which the water vapor produced by the transmission of heat of the absorbent plate (7) to the water (10) of the chamber vaporization (2), and by which the steam also descends of condensed water by the operation of the condensation chamber (1) which is another hollow cylinder of 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, they do not act as a thermal bridge when the solar collector works inside of its working temperature. The walls being elastic, these tubes admit the small variations of pressure that can be Produce and facilitate the assembly process.

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

The absorbent plate (7), by contact, transmits the thermal energy to the heat transfer tubes (6). To ensure the proper operation of heat dissipation equipment, is added a thermal valve (5) to each dissipation tube (4) of the heatsink device, which allow heat dissipation when the water temperature (10) reaches 100 ° C and prevents it from occurring said dissipation, when said temperature is around 60 ° C. When the water reaches 100 ° C it is when the chamber acts evaporation (2) of heat dissipation equipment, transmitting excess heat to the evaporation chamber (2), producing the evaporation of water (10) contained in the evaporation chamber (2) for subsequent condensation on the condensation plate (1), of so that the heat is finally transmitted to the outside. This way the water temperature of the pipes is achieved heat carriers (6), as well as the collection tube (3), never exceed 100 ° C

There are other variants of heatsinks solar collectors, as is the case with different designs, respecting the essentiality of the invention, which we can say that They will be apparent to an expert in the field.

Claims (7)

1. 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 , inside which 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. Improved heat sink for solar collectors according to previous claims characterized in that each evaporation chamber of each heatsink is located between two heat transfer tubes. 4. Improved heat sink for solar collectors according to previous claims characterized by containing each heat sink tube a thermal valve. 5. Improved heat sink for solar collectors according to previous claims characterized in that the evaporation chamber and the condensation chamber are hollow cylinders. 6. Improved heat sink for solar collectors according to previous claims characterized in that the condensation chamber is in contact with the back plate. 7. Improved heat sink for solar collectors according to previous claims characterized by being, the walls of the dissipating tubes, of silicone.