JPS5888552A - Variable volume type hot-water reservoir in solar heat water heater - Google Patents

Abstract

PURPOSE:To vary the amount of reserved hot-water in accordance with the amount of solar radiation by a method wherein a floating ball valve and a thermo valve are provided in a water feeding section from a cistern to the hot- water reserving tank. CONSTITUTION:The hot-water reserving tank 2, connected by circulating pipes 3a, 3b, is arranged above a heat collector 1, the cistern 4 is provided above the hot-water reserving tank 2, a water feeding pipe 7 is hung from the bottom of the cistern 4 to the bottom of the hot-water reserving tank 2 and the thermo valve 8, opened at the temperature of about 40 deg.C or more, as well as the floating ball valve 6', for reserving water of which volume is the same (about 200l) as the conventional hot-water heater, are provided at the lower end of the water feeding pipe 7. Another water feeding pipe 5, floating ball valve 6 and hot-water feeding pipes 9, 9' are shown in the diagram.

Description

[Detailed description of the invention] The present invention relates to a hot water storage tank for a solar water heater.

In recent years, with the rise in oil prices, solar water heaters, which obtain hot water at low cost using solar thermal energy, have become widespread in households and are used to heat hot water for bathtubs and the like. There are three types of solar water heaters: the sealed pump type, which has a heat collector and hot water storage unit in one unit, the natural circulation type, which naturally convects hot water obtained from the heat collector to the hot water storage area, and the forced circulation type, which uses forced convection. Although it is a closed pump system and is inexpensive, the temperature drop of hot water at night is large, and it is used in forced circulation type σ large-capacity facilities, which can be expensive due to the installation and operation of heat collection pumps, and it is not insulated. The natural circulation type, in which hot water is stored in a hot water storage tank through natural convection, has little temperature drop during the night, and is widely used. The hot water storage tank of the solar water heater currently used in each household is a fixed capacity type with a capacity of 12001, and has a heat collector with a heat collection area of 3 to 4 m2 so that hot water of about 40°C can be obtained even in winter. are connected. Therefore, during warm seasons or on days with high solar radiation, the temperature of hot water rises to 80°C (1), and the amount of heat is easily lost due to radiant heat from the hot water storage tank and convection, and water from about 400°C is heated to about 45°C. Although there is a heat collection area for heating, heat is actually lost through convection and radiation, making it practically the same as a lake tank with a heat collection area of 2m2, resulting in cost loss.

In order to eliminate the above-mentioned drawbacks, the present invention is a device that can vary the amount of water stored in a hot water storage tank from 2001 to 400 degrees depending on the increase or decrease in heat collection energy between winter and summer. It is characterized by being able to capture energy efficiently.

Hereinafter, the present invention will be explained in detail with reference to embodiment drawings. A heat-retaining hot water storage tank 2 is installed above a heat collector 1 and communicated with a rising pipe 3a and a down pipe 3b that protrude from the heat collector. In the solar water mixer, a systank 4 is installed on the top surface of the hot water storage tank 2, the systank 41 and the external water supply pipe 5 are connected to each other, and a floating pole 9P6t is connected to the systank 41, and an internal water supply pipe 7 whose upper end is communicated with the systank 4 is connected. It hangs down to the bottom of the hot water storage tank 2, and communicates with the lower end of the internal water supply pipe 7 a thermo gs that opens at a temperature of about 40°C or higher, and the same amount of water as a conventional water heater (about 2
00)) is made to communicate with the floating ball valve 6° for storing water. 9 and 9° in the figure indicate hot water pipes. Explain the action and effect.

The hot water storage device of the solar water heater according to the present invention is used for general household use, for example, with the volume of the hot water storage tank 2 being 400 mm and the heat collecting area of the heat collector 1 being 3 to 4 m2. The water supplied from the external water supply pipe 5 to the upper system tank 4 flows down the internal water supply pipe 7, and because the temperature is low [Ni thermo valve 8 is closed, the floating ball valve 6°
Water is supplied into the hot water tank 2, and the water level rises to about 200%
The floating ball valve 6° closes and the water supply is stopped when the same amount of water is stored.The solar heat energy during the day is absorbed by the heat collector 1, The hot water heated in the heat collector 1 convects into the hot water tank 2 and is gradually added ηDa to the water in the hot water tank 2, so that the temperature of the hot water in the hot water tank 2 reaches approximately 40°. When the temperature rises above C, the thermo valve 8 at the lower end of the internal water supply pipe 7 is opened, and the system tank 4 is opened.
When the temperature of the hot water drops below 40°C, the thermo valve 8 closes again, and the thermo valve 8 controls the temperature and amount of hot water in the hot water tank 2. Therefore, in the winter when the amount of solar radiation is low, the amount of hot water is increased by 200 C/day.
It is no different from a conventional solar water heater because it can only heat a hot water bath, but during the warm season when there is a lot of solar thermal energy or on days with high solar radiation, hot water of more than 200 degrees can be obtained, and it can be used for bathtubs and other purposes. or the remaining amount of hot water can be used the next day, and even if it is cloudy in Toyota, it is possible to obtain enough hot water over 40' (1!+1). The divergence of I is also small (0 and the conventional 200)
This device may be installed in a water heater, and in that case, if the flow rate of the floating ball valve is set to 100 rpm, it is possible to obtain hot water at a high temperature even in winter. The installation position of the 6° valve can be selected at any position depending on the shape of the hot water tank of the water heater. It has various effects.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot water storage device according to an embodiment of the present invention. Patent applicant Atsushi Takaaki

Claims (1)

[Claims] 1.In a solar water heater in which a heat-retaining type girder hot water tank is installed above the heat collector and the heat-retaining type hot water tank is communicated with the heat collector and the heat-retaining type hot water tank through a rising pipe and a descending pipe, a zeta tank is installed on the top of the hot water storage tank. A variable amount of hot water storage in a solar water heater, characterized in that a thermo valve and a floating ball valve are installed in the water passage part from the system tank to the hot water storage tank, and the amount of water flowing is controlled in response to changes in the amount of solar radiation. Device.