SU1553800A1 - Focusable solar energy collector - Google Patents

Abstract

The invention relates to solar technology, allows to increase the efficiency of the collector by improving the operational efficiency of utilization of solar energy, regardless of meteorological conditions and orientation of the Sun. The wedge-parabolic cylindrical shape of the concentrator (the central part is parabolic cylinder 1, and the peripheral - flat panels 2, oriented 45 ° to the optical axis of the concentrator) with the longitudinal placement of the main tubular receiver 3 and the additional receiver in the form of two flat tube plates (TD) 4 and 5 hinged at the intersection point 6 of the optical axis with the plane separating the central and peripheral parts of the concentrator, provides a high degree of concentration of solar energy and its utilization into heat energy onositel If TDs 4 and 5 are placed horizontally, the collector works as a flat solar collector, providing heating of the heat transfer medium by utilizing both direct and scattered (sky radiation) components of solar radiation. 1 hp f-ly, 2 ill.

Description

FIG. 2

The invention relates to solar technology, in particular to solar collectors with radiation concentration means.

The purpose of the invention is to increase the efficiency of the Collector by improving the operational efficiency of utilization of solar energy regardless of meteorological conditions and orientation of the Sun.

FIG. 1 shows a collector, a sagittal section; Fig 2 - the same, the meridional section.

The focusing solar collector contains a mirror composite concentrator with a meridional cross section, emaing the central part in the form of a parabola 1 and adjacent to it an axisymmetric peripheral in the form of straight line segments 2 rejected by 45 relative to the optical axis of the concentrator, and the receiver 3 located in the focus parabolas. The collector also contains an additional receiver | the form of two flat tube plates 4 AND 5 with a selective coating, hinge- (but fixed on the optical axis I and its intersection point 6 with the plane (separating the central and peripheral parts of the concentrator); - i (in the form of a parabolocylinder and flat # anels, respectively.

Pipe boards 4 and 5 of the additional Receiver are installed either horizontally (shown by the dotted line in Fig. 2), overlapping the central part of the Hub, or vertically along the optical axis of the hub up to its inlet, limited by the iJKtro focal plane of the parabolic 1) (ilindra.

The main receiver 3, located at the focus of the parabolic cylinder, can (Lt is made tubular.

The walls of the concentrator are made of tin or plastic with a heat insulating layer 7 of foam plastic, and the inlet is blocked by protective glass 8, which makes it possible to significantly reduce the amount of convective losses.

The coolant enters through the cold water pipe 9 to the flat tube plates 4 of the additional solar energy receiver, which are successively connected by a common pipe 10. The last coolant enters the solar energy receiver 3 and further

about

five

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11 hot water enters the pipeline.

The collector in the normal mode works as follows.

 The perceived solar radiation after reflection on flat panels 2 (peripheral part) of the concentrator falls normally on flat tube sheets 4 and 5 and is absorbed by means of a selective coating. The rest of the perceived solar radiation is redistributed by the parabolic-cylindrical surface 1 (central part) of the concentrator to the tubular selective receiver 3 and is absorbed by it.

Thus, the implementation of the peripheral part of the concentrator in the form of planes with an opening angle ti 90 ensures the normal input t of reflected solar energy to the plane selective receiver, resulting in an increased absorption efficiency. In addition, the parabolocylindrical central part of the concentrator provides a high degree of concentration, solar energy at the tubular receiver when the heated coolant leaves the tube plates 5 and 4 and increases its heating.

With the scattered component (sky radiation) prevailing in the perceived solar radiation flux, the tube plates of the heat sink 4 and 5 occupy a horizontal position (Fig. 2). In this mode, the collector works as a flat solar collector, ensuring sufficient heating of the coolant due to absorption of the incident diffuse radiation, as well as a partial contribution of diffused solar radiation, reflected from the flat panels 2, reflected from the flat panels 2.

The wedge-parabolic cylindrical shape of the concentrator with the longitudinal placement of flat and tubular receiver receivers reduces the influence of the position of the Sun relative to the orientation of the collector on the utilization of solar energy into the energy of the heat carrier.

Claims (2)

1. A focusing solar collector containing a mirror composite capacitor with a meridional cross section having a central part in the shape of a parabola and adjacent to it an axisymmetric peripheral part in the form of straight sections deflected i by 45 ° relative to the optical axis of the concentrator, and the receiver located Parabola focusing, characterized in that, in order to increase efficiency, the collector contains an additional receiver in the form of two flat tube plates with a selective coating hinged on the optical axis at the point its intersection with the plane bisecting the central peripheral portion of a hub made in the form parabolo- cylinder and flat panels, respectively, the tube plates of an additional receiver mounted or horizontally overlapping the central part of the hub, or vertically along the optical axis concentrator up to its inlet, bounded by the focal plane of the parabolic cylinder. 2. The collector of claim 1, characterized in that the main the receiver is tubular. R // g. / 5 7