JPH0221492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar heat collector that is used as an evaporator for a heat pump water heater that collects solar heat and evaporates a heating medium.

Structure of conventional example and its problems As shown in Fig. 1, in a conventional general solar heat collector, a heat collecting plate 1 is housed in an exterior body 2 together with a heat insulating material 3, and the upper part is covered with transparent glass 4. It has a structure covered with

In conventional heat collectors, the heat collecting plate 1
Glass 4, to prevent convection heat radiation from the air to the atmosphere.
The heat insulating material 3 was used, and naturally it did not have the ability to collect heat from the atmosphere and receive heat. Therefore, since they relied on collecting only solar thermal energy, a very large heat collecting area was required, which caused problems in terms of installation space and equipment costs.

Purpose of the Invention The present invention aims to improve the amount of heat collected per unit area by allowing a solar heat collector to simultaneously exhibit the function of collecting atmospheric heat.

Composition of the Invention To achieve the above object, the present invention forms a heat collector with fin pipes, and promotes ventilation of outside air so that the surface of the fins is actively contacted with the atmosphere. It is equipped with a flow path.

DESCRIPTION OF EMBODIMENTS As shown in FIG. 2, a system according to an embodiment of the present invention is a heat medium circulation system comprising a compressor 7, a heat exchanger 8a, heat medium pipes 9, 10, an expansion valve 11, and a heat collector 6. and a hot water supply circuit consisting of a heat storage tank 12, a circulation pump 13, and a heat exchanger 8b.
14 is a hot water supply port. The heat collector 6 is designed to collect both atmospheric heat and solar radiant heat, and does not use a transparent film such as glass 4.

The specific configuration of the heat collector 6 will be explained. In FIG. 3, the heat collecting plate 15 is composed of fins 16 and pipes 17, and a plurality of these are arranged and held by a surrounding frame 18.

Solar heat is efficiently collected by surface treatment such as black coating applied to the surface of the fins 16. Note that 23 is a gap.

On the other hand, atmospheric heat is adiabatically expanded by the expansion valve 11, and a heat collection operation is performed by convective heat transfer on the surfaces of the fins 16 and pipes 17, which are kept at a lower temperature than the outside air temperature by heat conduction of a low-temperature, low-pressure liquid heat medium.

Atmospheric heat is collected from the fin 1 as shown in Figure 4.
This is obtained by passing atmospheric air through an air circulation hole 19, such as a circular or oval shape, provided on the flat surface of the air conditioner 6. The flow of wind in this case will be explained. Heat collection surface 2
When the airflows 21 and 22 in the direction perpendicular to zero pass through the airflow holes 19, high convective heat transfer is performed over the entire surface of the fins 16.

Effects of the invention (1) Even on a clear day, the amount of solar heat collected per 1 m ² is insufficient
The amount of solar radiation collected from 4500Kcal/day is 5000Kcal/ ^m2・
The sun is the highest, but this also collects 2000 Kcal of atmospheric heat (the difference between the fin surface temperature and the outside temperature).
10deg, when the wind speed on the fin surface is 0.3m/s), and the amount of heat collected can be greatly increased.

(2) Heat collection operation can be performed even during rainy days and at night when solar heat is not available.

(3) Heat can be collected efficiently even when the wind is perpendicular to the heat collection surface.

(4) Even when the heat collection surface has wind directions both parallel and perpendicular to it, such as when installed on a roof, it is possible to efficiently collect heat in either direction simply by providing air circulation holes.

(5) Since there is no need for a tempered glass transparent membrane or heat insulating material like in conventional heat collectors, it is possible to reduce the weight and size of the heat collector and provide an inexpensive heat collector.

(6) Even if the wind blows against the heat collector, it passes through the heat collecting plate, reducing the wind pressure load and allowing safe installation work.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the configuration of a conventional heat collector, Figure 2 is a system diagram showing a system according to an embodiment of the present invention, and Figure 3 is a diagram showing the configuration of a heat collector according to an embodiment of the present invention. The front view and FIGS. 4a and 4b are a front view and a cross-sectional view of the main parts of the heat collector. 16...Fin, 17...Pipe, 19...Atmospheric ventilation hole, 23...Gap.

Claims (1)

[Claims] 1. A plurality of flat fins that collect solar heat;
It consists of a pipe that thermally adheres to the surface of the fin and in which a heat medium circulates, a plurality of air circulation holes are provided on the surface of the fin, and a plurality of fins are arranged in parallel in the transverse direction. , a solar heat collector with gaps formed between the fins. 2. The solar heat collector according to claim 1, wherein the atmospheric communication holes provided in the fins are cut and raised holes.