JPH0136023B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water heater having a heat collecting pipe above a user-side heat exchanger.

Configuration of conventional example and its problems A conventional hot water supply system in which a heat collection pipe is provided above the heat exchanger on the user side, and the two are connected by a pipe line to circulate the heat exchange medium and transfer the heat from the heat collection pipe to the heat exchanger on the user side. The vessel is
Not only did it require a pump for circulation, it also consumed a considerable amount of electricity. For this reason, water heaters that use solar energy to heat their heat collecting pipes often use solar energy to their advantage, but their energy-saving effects often decline. Another type of water heater that has been devised and put into practical use is a water heater that has a hot water storage tank above the heat collecting pipe and is heated by the heat from the heat collecting pipe, and uses natural convection of the circulating medium to collect heat without power. In this case, the distance between the hot water storage tank and the hot water faucet used is usually long, and the temperature of the water in the pipe between them drops due to heat radiation when hot water is not being used, making it ineffective. Therefore, when used to supply hot water in small quantities other than for filling a bath, the ratio of ineffective water increases, and the effective utilization rate of the energy that has been collected becomes extremely low.

Purpose of the Invention The present invention improves the problems of the prior art described above, eliminates the need for a pump to circulate the heat exchange medium, and
Furthermore, the purpose is to provide a water heater with high heat collection efficiency.

Structure of the Invention The present invention provides a heat collecting pipe, a sealed tank above the heat collecting pipe, and a user-side heat exchanger below the heat collecting pipe, and connects the upper end of the heat collecting pipe and the upper end of the sealed tank to a first pipe line through a first on-off valve. The lower end of the heat collecting pipe and the lower end of the sealed tank are connected via the second on-off valve to the second pipe line, and the lower end of the sealed tank and the lower end of the heat exchanger on the user side are connected via the third on-off valve to the third pipe line. The upper end of the heat collecting pipe and the upper end of the heat exchanger on the user side are connected with a fourth pipe line to form a sealed pipe, a heat medium is sealed in the sealed pipe, and a liquid level detector for the heat medium is installed in the sealed tank. When the liquid level of the heating medium detected by the liquid level detector is higher than the upper limit setting value, the first on-off valve and the second on-off valve are opened, and the third on-off valve is closed. The heat medium has the same pressure, and due to gravity, the heat medium in the closed tank flows into the heat collecting pipe, and the liquid level of the heat medium in the closed tank falls, and the liquid level of the heat medium falls below the lower limit set value. Then, by closing the first on-off valve and the second on-off valve and opening the third on-off valve, the heat medium that evaporates after receiving heat from the heat source in the heat collection pipe heats the usage part in the usage-side heat exchanger and condenses. The liquefied heat carrier is
The heat medium is pushed up into the closed tank by the evaporation pressure, and the liquid level of the heat transfer medium inside the closed tank rises.

By repeatedly opening and closing the first to third on-off valves,
It moves the heat from the heat source to the usage area.

DESCRIPTION OF EXAMPLES The present invention will be explained below with reference to Examples. 1st
The figure is a configuration diagram of a water heater using solar energy as a heat source according to an embodiment of the present invention, in which a solar heat collector 1, a closed tank 2, and a heat exchanger 4 provided in a hot water storage tank 3 are connected in parallel via a conduit 5. and on-off valves 6, 7, connected to the pipe line 5.
8 is provided in the conduit 5, in the operating state,
A liquid level detector 10 is provided in the closed tank 2 of the thermal medium 9, which encloses a thermal medium 9 capable of changing the phase between a gas phase and a liquid phase, and the liquid level detector 10 detects the on-off valves 6, 7 and 8, as shown in Fig. 2, while the liquid level in the closed tank 2 changes from the lower point to the upper point, the on-off valves 6 and 7 are closed, and the on-off valve 8 is opened, so that the liquid level changes from the upper point to the upper point. During the change to the lower point, the on-off valves 6 and 7 are opened and the on-off valve 8 is closed, as shown in FIG.

In this water heater, first, the liquid level of the heat medium 9 is maintained at the same level 11 by gravity, and the liquid level of the heat medium 9 in the sealed tank 2 is below the lower point, and the liquid level Under the control of the detector 10, the on-off valves 6,
7 is closed and on-off valve 8 is open.

Next, the solar heat collector 1 is heated by sunlight, the heat medium 6 in the solar heat collector 1 is vaporized, and the heat exchanger 4
The water moves due to the pressure difference, liquefies and gives heat to the water in the hot water storage tank 3. The liquefied heat medium 9 is pushed up inside the pipe line 5 by the pressure of the vaporized heat medium 9 and accumulates in the closed tank 2, so that the liquid level of the heat medium 9 in the closed tank 2 rises.

When the liquid level of the heat medium 9 reaches the upper point of the closed tank 2, the on-off valves 6 and 7 are opened and the on-off valve 8 is closed, as shown in FIG. 2, under the control of the liquid level detector 10.
Since the on-off valves 6 and 7 open, the pressure in the sealed tank 2 and the solar heat collector 1 becomes the same, and the pressure in the sealed tank 2 increases due to gravity.
The heat medium 9 inside flows into the solar heat collector 1. Heat medium 9 in solar heat collector 1 reduced by vaporization
returns to the initial amount, and the liquid level of the heat medium 9 in the closed tank 2 falls, and when the liquid level falls below the lower point, the on-off valves 6 and 7 are closed under the control of the liquid level detector 10, and the on-off valve 8 is closed.
The same operation is repeated thereafter, and the heat obtained by the solar heat collector 1 is applied to the water in the hot water tank 3.

Effects of the invention There is no need to use a pump to circulate the heat medium, and the on-off valve is controlled by a liquid level detector in the sealed tank, so the heat obtained by the solar heat collector is transferred to the hot water storage tank. Since it is used only for heating the water and circulating the heat medium, there is no loss due to overheating of the solar collector, and a water heater with high heat collection efficiency can be obtained.

Although the present invention has been described above using a water heater that uses solar energy as a heat source as an example, the effects of the present invention can be implemented in a heating device that has a heat collection pipe above a user-side heat exchanger, regardless of the type of heat source. That is clear.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a water heater using solar energy as a heat source according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of control of an on-off valve using a liquid level detector. 1... Solar heat collector, 2... Sealed tank, 3...
...Hot water tank, 4...Heat exchanger, 5...Pipeline, 6,
7, 8...Opening/closing valve, 9...Heating medium, 10...Liquid level detector, 11...Liquid level at the same level.

Claims (1)

[Claims] 1. A closed tank provided above the heat collecting pipe, and a user-side heat exchanger provided below the heat collecting pipe, and the upper end of the heat collecting pipe and the upper end of the sealed tank are connected to a first pipe line via a first on-off valve. The lower end of the heat collecting pipe and the lower end of the sealed tank are connected by a second pipe line via a second on-off valve, and the lower end of the sealed tank and the lower end of the utilization side heat exchanger are connected via a third on-off valve. A fourth pipe connects the upper end of the heat collecting pipe and the upper end of the user-side heat exchanger to form a sealed pipe, and a phase between the gas phase and the liquid phase is contained in the sealed pipe in an operating state. A changeable heat medium is enclosed, a liquid level detector is provided in the closed tank of the heat medium, and the liquid level of the heat medium in the closed tank detected by the liquid level detector is equal to or higher than an upper limit setting value. In this case, the first on-off valve and the second on-off valve are opened, and the third on-off valve is closed,
If it is below the lower limit set value, the first on-off valve and the second on-off valve are closed and the third on-off valve is opened; when it is below the upper limit set value and above the lower limit set value, the first on-off valve, the A water heater that maintains the open/close states of the second on-off valve and the third on-off valve as they were before.