JPS6042551A - Solar pond with pool - Google Patents

Abstract

PURPOSE:To obtain a solar pond whose absorbing efficiency is high and having no salt water loss from an unconvention layer and effective use of a pool of a transparent fluid as a fish breeding tank or a hot water pool is contrived, by a method wherein unconvection layer is provided above a convection layer of the bottom part, on which the pool of the transparent fluid is arranged through a transparent partition layer. CONSTITUTION:Energy of insolation S is absorbed partly by a pool 5 of a transparent fluid, a transparent partition layer 4 and unconvection layer 3 and the rest of the same arrives at a convection layer 2 of a solar pond 1. As concentration C of salt of the unconvection layer 3 increases according as a depth becomes deeper and possesses distribution of the concentration which becomes the maximum concentration C1 at a boundary between the convection layer 2, which is the deepest part of the unconvection layer 3, and the unconvection layer 3, a convection is not generated. The convection layer 2, therefore, is turned into a state as if it is covered with a heat insulating layer and solar energy is accumulated as heat. As the unconvection layer 3 does not touch the open air, a disturbance of a concentration gradient of salt close to the surface of the unconvection layer 3 through wind is prevented from occurring and seaweed in both the layers is prevented from growing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a solar pond with a swimming pool, which has a transparent 4
The present invention relates to a solar pond 7 with a swimming pool provided with a transparent fluid pool such as a swimming pool or a fish tank at the top through 191 layers.

Conventional technology In order to effectively utilize solar energy, the heat capacity h of water etc.
A solar pond has been proposed as a heat storage pond that absorbs solar energy into a fluid with a large amount of energy and stores it in the form of heat over a long period of time.If water is used as a heat storage body, the solar energy λ ruki incident on the solar pond is It is absorbed by the water in the circle, and the temperature of the water rises.In order to prevent this heated water from moving to the surface of the solar pond and dissipating heat from the surface, a non-convection system is installed in the upper layer of the fluid inside the solar pond. A layer is formed to eliminate direct contact between the convective layer and the outside air.The non-convective layer is, for example, a water layer that has a concentration gradient such that the concentration is low at the surface of the solar pond and increases as the depth increases.

In the non-convection layer, a solution with high salt concentration and high density is located at a deep position, and a solution with low salinity and low density is located at a shallow position, so no convection flows from the deep part to the surface. It has been observed in nature and confirmed by experiments that such a concentration gradient in the non-convective layer due to salt water is maintained over a long period of time.

However, in a conventional solar pond with a non-convective layer,
(b) Disturbance of the concentration gradient due to wind is unavoidable as the non-convective layer is exposed to the outside air, (b) The transmittance of solar energy decreases due to the growth of algae, and (c) Salinity due to water content, etc. There were disadvantages such as the need for time and money to replenish the decrease in the amount of water.

On the other hand, fish ponds are attracting attention as a facility that uses transparent fluid pools to secure marine resources, but conventional fish ponds require heating in the winter depending on their location and the type of fish being raised. The disadvantage was that equipment costs, fuel costs, operating costs, etc. were high.Additionally, warm water pools are being constructed as sports facilities, but conventional heated pools also have the cost of heating in winter. It had the drawback of being bulky.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to overcome the drawbacks of the prior art by providing a solar pond with a pool of simple construction.

Structure of the Invention In order to achieve this object, the solar pond with a pool according to the present invention has a non-convection layer in a part of the convection layer at the bottom, and a transparent partition layer is provided on the top of the convection layer to allow swimming pools, fish tanks, etc. It has a configuration in which a transparent fluid pool is arranged.

Embodiment Referring to FIG. 1, which shows a schematic longitudinal section of an embodiment of the present invention, the solar pond with pool 1 according to the present invention has a convective layer 2 collapsed in its lower part, and a non-convective layer 3 that is a part of the convective layer 2. provided above. A pool 5 of transparent fluid is placed in -1- of the non-convection layer 3 with a transparent partition layer 4 interposed therebetween.

In the illustrated example, the transparent fluid pool 5 is a heated water pool, and the transparent partition layer 4 is formed of a strong transparent plate that does not transmit disturbances such as vibrations of water in the pool 5 to the non-convection layer 3. However, the transparent fluid pool 5 of the present invention is not limited to a heated water tank for a water body, and may be, for example, a clean water tank or a transparent fluid tank for various processes. Further, the transparent partition layer 4 does not necessarily need to be a strong transparent plate, and it is sufficient if it is a transparent layer that partitions the fluid in the transparent fluid pool 5 and the fluid in the non-convection layer 3. Furthermore, the transparent partition layer 4 does not need to be transparent to all visible light, but only needs to be transparent to short wavelength components of solar energy.

The non-convective layer 3 in the illustrated example is an aqueous solution layer of a salt such as sodium chloride NaCQ having a depth of 1. The non-convective layer 3 is configured such that its salt concentration increases with the depth D from the transparent partition layer 4 toward the convective layer 2. be done.

To explain the operation, solar radiation S carrying solar energy first enters the transparent fluid pool 5. The energy of solar radiation S is
A portion of the light is reflected by the surface of the transparent fluid pool 5, a portion of which is absorbed by the transparent fluid pool 5, the transparent partition layer 4, and the anti-convection layer 3, and the remainder reaches the convection layer 2 of the solar pond 1.

Note that there is some reflection also at the interface between the transparent fluid pool 5 and the transparent partition layer 4, and at the interface between the transparent partition layer 4 and the non-convection layer 3. Absorption in convective layer 2 is relatively small;
The bottom surface B of the solar pond l is at the end of the solar radiation S lJ::-v
heated by the exposed part. The convection layer 2 is warmed by the heat from the heated bottom surface B.

The salinity concentration C in the non-convective layer 3 has a distribution shown in the concentration distribution curve in Fig. 1, that is, the concentration increases with depth D, and at which boundary of the convective layer '2, which is the deepest part, reaches the maximum concentration C. It has a distribution. In the embodiment of FIG. 1, the convective layer 2 is formed by salt water of a particular concentration. While the convective layer 2 causes convection due to its constant salt concentration, the non-convective layer 3 does not cause convection because its lower part is high concentration and high density and the upper part is low concentration and low density. Therefore, the heat loss that escapes through the non-convection layer 3 is only due to heat conduction of the salt water, and there is no convection loss, and the heat conduction of the salt water is extremely small. Therefore, the convective layer 2 becomes as if covered with a heat insulating layer, and accumulates solar energy as heat.

The heat accumulated in the convection layer 2 in this way is
Not only is the heat effectively used for temperature difference power generation and other various uses, but it is also used to heat the fluid in a transparent fluid pool 5 such as a hot water pool.

FIG. 2 shows an example of annual temperature changes in a solar pond experiment according to the present invention conducted in Tokyo. In the figure, Ta
is the outside air temperature, Tg is the temperature of the ground surface E'' in FIG. 1, Ts is the temperature of the surface of the pool 5, T3 is the temperature of the non-convection layer 3, and Tb is the temperature of the bottom surface B of the solar pond 1.

T2 is the temperature of the convective layer 2. As is clear from the figure,
The maximum value of the temperature T2 of the convective layer 2 occurs several days to several tens of hours after the first maximum value of the temperature Ta, and the temperature T2
The maximum value of T2 reaches 50°C or more, and the temperature of the convective layer T2 is about 3 (1'c) even in winter, and
It is recognized that the temperature Tb of the convective layer 2 is always higher than the temperature T2- of the convective layer 2.

FIG. 3 shows an embodiment in which freshwater or seawater is filled in the induction warmer boule 5 and used as a fish tank.

In this case, the fish tank, formed as a transparent fluid pool 5, is heated by heat from the non-convection tank 3, which is maintained at about 20-40'C throughout the year.

Therefore, fuel for heating the feed tank is not required or can be significantly reduced.

Effects of the Invention The solar pond with a pool according to the present invention has the transparent fluid pool provided on the side of the solar pond function section via a transparent partition layer, and therefore has the following effects.

(a) Since the non-convective layer is not in contact with the outside air, disturbance of the salinity concentration gradient near the surface of the non-convective layer due to wind is prevented, and no device is required to maintain the concentration gradient.

(b) Since there is no loss of salt water from the non-convection layer, no salt replenishment device is required for the non-convection layer.

(c) Since the convection layer and non-convection layer that function as a solar pond do not come into contact with air, the growth of algae in both layers is prevented and there is no decrease in light transmittance in the solar pond functional area. Therefore, it has a high energy absorption effect and does not require an algae removal device such as a salt water purification device.

(d) Since there is a transparent fluid pool part such as a heated swimming pool above the part that performs the function of the Tour Lab Z, it is possible to make effective use of the land and reduce the construction cost of the Resola Point part.

(e) If the transparent fluid pool is a fish tank or a warm water pool, the fuel cost required for heating them in winter can be significantly reduced.

(f) Since no movable elements are required to heat the fish tank or hot water pool, the operation is simple and maintenance and operation costs can be expected to be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of one embodiment of the present invention, FIG. 2 is a diagram showing temperature distribution in one embodiment of the present invention, and FIG. 3 is a schematic vertical cross-sectional view of another embodiment of the present invention. The figure is ■...Solar pond with pool, 2...Convection layer, 3
...Non-convection layer, 4.Transparent partition layer, 5.Transparent fluid pool. Patent applicant Kajima Corporation Patent application agent Patent attorney Tsugube Ichito

Claims (1)

[Claims] A solar pond with a pool, comprising: a non-convection layer at the bottom of the convection layer; and a transparent fluid pool via a transparent partition layer at the bottom of the non-convection layer.