JPH0225659A - Delivery device of heat from heat storage device - Google Patents

Abstract

PURPOSE:To allow a continuous delivery of liquid at a desired temperature by providing a means which adjusts the mixing ratio between a high temperature liquid from a heat storage means containing high pressure non-condensible gas and a low temperature liquid, and a control means thereof. CONSTITUTION:The water 5 in a heat storage container 1 is heated by a heater 6, and stores the nighttime power energy, etc., as sensible heat. In order to use hot water at a desired temperature, the valve 11 of the hot water delivery pipe 10 is opened to allow the boiling water in the heat storage container 1 to enter a mixing tank 7 via the boiling water delivery pipe 4 on account of the pressure of non-condensible nitrogen gas 2 or steam. Meanwhile, water at normal temperature enters the mixing tank 7 via feed water pipes 3, 8 and a flow rate regulating valve 9, where it is mixed with the former and the resultant hot water is delivered from the hot water delivery pipe 10. Since the flow rate regulating valve 9 is controlled by a controller 12 in accordance with the difference between the actual temperature of the hot water in the mixing tank 7 and the set temperature, the hot water at a desired temperature can be stably delivered regardless of the delivery rate of hot water or the temperature of the boiling water from the heat storage container.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for extracting heat in the form of hot water from a liquid sensible heat storage device.

As a means to effectively utilize unsteady heat such as late-night power supply and demand time lags, solar heat, and industrial waste heat, it is possible to store energy in the form of heat and, if necessary, store energy in the form of hot water, etc. A heat storage device that extracts heat is used.

One of the typical heat storage devices currently in practical use is a late-night electric water heater. In this system, water is supplied into a container at atmospheric pressure or low pressure, and a heater that generates heat using late-night electricity heats the water to a temperature at which it does not evaporate, storing heat in the form of sensible heat and releasing it as needed. Hot water is extracted and used, an amount of water equivalent to the amount of hot water extracted is replenished, and additional heating is performed using daytime electricity to maintain a predetermined heat storage temperature.

In a heat storage device with this configuration, heat storage is generally performed under atmospheric pressure, so the temperature of the hot water in the container can only be raised to about 80 to 85°C. For example, when water at 20°C is stored at 85°C, The M calorie is only about 65 Kcal/kg. Therefore, if hot water is continuously taken out from the heat storage device, even if reheating is performed, a predetermined heat storage temperature cannot be maintained, and fluid at a constant operating temperature cannot be taken out continuously.

In view of the above-mentioned drawbacks of conventional sensible heat storage devices, an object of the present invention is to provide a heat extraction device that can continuously take out liquid at a predetermined temperature from a liquid sensible heat storage device. .

In order to achieve the above-mentioned purpose, the heat extraction device from a liquid sensible heat storage device of the present invention for private heating is provided by filling the upper part of the heat storage container with a high-pressure non-condensable gas so that the pressure inside the heat storage container is always kept above a certain level. 1. A section where the piping for taking out the high-temperature liquid from the heat storage container and the piping for supplying the room-temperature liquid are connected to mix the high-temperature liquid and the low-temperature liquid, and the mixing ratio of the high-temperature liquid and the low-temperature liquid in this section. and a means for adjusting the mixing ratio, and detecting the temperature of the liquid at this part, and adjusting the above-mentioned mixing ratio adjusting means so that the temperature of the mixed liquid reaches a predetermined temperature based on the detected value. The invention is characterized in that it has a control means for controlling.

As the mixing ratio adjustment means for the above-mentioned high-temperature liquid and room-temperature liquid, a flow rate control valve provided on either a pipe that supplies the room-temperature liquid to the mixing area or a pipe that takes out and supplies the high-temperature liquid from the heat storage container is used. .

As the high-temperature liquid taken out from the heat storage device, in addition to the heat storage liquid itself, a liquid heated by heat exchange with the heat storage liquid can be used.

The above-mentioned mixing part can be provided separately from the heat storage container or can be formed integrally with the heat storage container.

In the device of this invention, the heat storage liquid in the heat storage container is always pressurized above a certain pressure by high-pressure non-condensable gas, the vaporization temperature is increased, and evaporation is suppressed, so it is more efficient than conventional devices. Heat can be stored in a stable liquid form at high temperatures (for example, 150°C if the heat storage liquid is water). Therefore, the liquid taken out from the heat storage container is a high temperature liquid, and is mixed with room temperature liquid at the mixing section to reach the operating temperature. It can be taken out as a liquid. The mixing ratio is controlled by detecting the temperature of the liquid at the mixing site and based on the detected value so that the temperature of the liquid at the mixing site becomes a predetermined temperature.

The temperature of the liquid in the heat storage container is high because it is maintained above a certain pressure by high-pressure non-condensable gas, so the amount of stored sensible heat is large, and even if the temperature drops due to continuous use, the amount of room-temperature liquid to be mixed is It is possible to take out the α-form (at a constant temperature) simply by adjusting the temperature, and when not in use, it returns to the original heat storage temperature by reheating.

Dog 11 Examples of the present invention will be described in detail below based on the drawings.

In the embodiment shown in FIG. 1, the heat storage container 1 is configured as a pressure-resistant container, and a non-condensable gas such as nitrogen gas 2 is sealed in the upper part of the container. A water supply pipe 3 and a hot water outlet pipe 4 are connected to the heat storage container 1, and water 5 at room temperature is supplied from the water supply pipe 3 to the heat storage container 1, while compressing nitrogen gas 2 having a pressure of, for example, 5 atmospheres. Increases the pressure inside the container to the level of water supply.

At the bottom of the container 1, there is a heater 6 that generates heat using late-night electricity, or a heating coil in the case of M heat from industrial waste heat or solar heat, which heats the supplied water and raises it to a predetermined heat storage temperature. Warm up. This temperature depends on the nitrogen gas 2 and, depending on the design, on the pressure of the gas phase which is further increased in pressure by water vapor. It reaches temperatures as high as ℃. Therefore, the amount of heat storage is approximately 2.5 times that of a conventional late-night electric water heater.

The hot water outlet pipe 4 is provided with a mixing tank 7 for mixing hot water and room temperature water, and a water supply pipe 8 branched from the water supply pipe 3 is connected to this for supplying room temperature water. The water supply pipe 8 is provided with a flow control valve 9 . The flow rate control valve 9 detects the temperature of the hot water in the mixing tank 7 and adjusts the flow rate of the flow rate control valve by a controller 12 that adjusts the mixing ratio so that the temperature of the hot water in the mixing tank 7 reaches a predetermined temperature. The flow rate is controlled according to the obtained flow rate.

Since this device has the above-described configuration, the water 5 in the heat storage container 1 is heated by the heater 6 to a temperature considerably higher than the N heat temperature of a conventional heat storage device, and the water 5 in the heat storage container 1 is heated to a temperature considerably higher than the N heat temperature of a conventional heat storage device.
It can be stored as heat.

To take out hot water at a desired temperature, open the valve 11 of the hot water take-out pipe 10 and the hot water in the heat storage container 1 will be transferred to the mixing tank 7 via the hot water take-out pipe 4 under the pressure of non-condensable nitrogen gas 2 and water vapor. On the other hand, water at room temperature flows into the mixing tank 7 via the water supply pipe 3.8 and the sub-volume control valve 9, where it is mixed and taken out from the hot water outlet pipe 1o.

Based on the difference between the actual temperature of the hot water in the mixing tank 7 and the set value, the flow control valve 9 sets the actual value to increase the flow rate of room temperature water if the actual value is higher than the set value. If it is lower than the value, additional control is performed to reduce the flow rate of room temperature water, so hot water at a predetermined temperature is stabilized regardless of the amount of hot water extracted or the temperature of the hot water taken out from the heat storage container. It can be taken out.

The amount of hot water decreases as hot water is taken out from the heat storage container 1, but room temperature water corresponding to the amount is supplied from the water supply pipe 3 and heated by the heater 6, or the decrease in the amount of hot water is left as is. When replenishing water and heating it with the heater 6, it is difficult to maintain the temperature of the liquid inside the container at a predetermined heat storage temperature, but the temperature inside the container 1 is considerably higher than the temperature of the hot water taken out and used. By changing the mixing ratio of hot water and room temperature water mixed in the mixing tank, hot water at a constant temperature can be stably taken out, and even if the reduced amount of hot water is not replenished at all, the amount of heat stored in the heat storage container 1 can be increased. is large and is maintained at a high temperature above a certain temperature by the pressure of nitrogen gas 2, so hot water at a certain temperature can be taken out.

Note that it is a matter of course that the high temperature piping system between the heat storage container and the heat storage container is properly insulated 13 and provided with instrumentation and accessory equipment such as a safety valve 13.

In the pond embodiment shown in FIG. 2, the water supply pipe 3 of the above embodiment is
and the hot water take-out pipe 4 are connected by a heat exchange pipe 13 within the heat storage container 1, and the water flowing through the pipe is transferred with heat from the liquid 5 stored in the heat storage container 1 and becomes hot water, which is then passed through the hot water take-out pipe. 4.

By doing this, the liquid in the heat storage container 1 simply acts as a heat storage material, and an appropriate substance other than water used as hot water, such as fluorocarbon, can be used, and nitrogen gas 2 The pressurizing force can also be appropriately set separately from the water supply pressure.

Other configurations and effects are the same as those of the embodiment shown in FIG.

In yet another embodiment shown in FIGS. 3 and 4, respectively, the first
In the embodiment shown in FIGS. and 2, the flow rate control valve 9 provided in the branch pipe 8 that supplies room-temperature water to the mixing tank 7 is provided in the middle of the hot water outlet pipe 4, and the other configurations are as follows. It is the same as FIGS. 1 and 2.

With this configuration as well, the mixing ratio of hot water and room temperature water flowing into the mixing tank 7 is changed according to the actual temperature of the hot water in the mixing tank 7, and hot water at a predetermined temperature is supplied from the hot water outlet pipe 10. It can be taken out.

In still other embodiments shown in FIGS. 5 and 6, respectively, the mixing tank 7 is formed integrally with the heat storage container 1 as a mixing portion separated from the heat storage container 1 by one partition wall.

Although the structure is surrounded by common heat insulation, the structure and piping system are the same as those of the embodiments shown in FIGS. 3 and 4, respectively, and therefore, the functions and effects are also the same.

As described above, according to the present invention, when extracting heat as hot water etc. from a sensible heat storage device, even if the extraction flow rate and the temperature of the heat storage liquid in the heat storage device fluctuate, the liquid at a constant temperature can be stabilized. It becomes possible to take it out.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention, and FIGS. 2 to 6 are system diagrams showing other embodiments of the invention. 1... Heat storage container, 2... Nitrogen gas (high pressure non-condensable gas), 3... Water supply pipe, 1... Hot water outlet pipe, 5... Heat storage liquid, 6... Heater ( Heating means using external energy) 7.
...Mixing tank (mixing part), 8...Water supply pipe, 9...
・Flow rate control valve, 10...hot water outlet pipe, 12...control #
4 Means 1st Figure 3 Figure 2 Figure 4

Claims (6)

[Claims] (1) In a device for extracting heat from a liquid sensible heat storage device in which a heat storage liquid and a means for heating the liquid using external energy are built into a heat storage container, a high pressure non-condensable gas is sealed in the upper part of the heat storage container, and A section where a pipe for taking out the high temperature liquid from the heat storage container and a pipe for supplying the room temperature liquid are connected to mix the high temperature liquid and the room temperature liquid, means for adjusting the mixing ratio of the high temperature liquid and the room temperature liquid at the section; and a control means for detecting the temperature of the liquid in the region and adjusting the mixing ratio adjusting means to a mixing ratio such that the temperature of the mixed liquid reaches a predetermined temperature based on the detected value. Heat extraction device. (2) The heat extraction device according to claim 1, wherein the mixing ratio adjustment means for the high-temperature liquid and the room-temperature liquid is a flow rate regulating valve provided in a pipe that supplies the room-temperature liquid to the mixing area. . (3) The heat extraction device according to claim 1, wherein the mixing ratio adjustment means for the high-temperature liquid and the room-temperature liquid is a flow rate regulating valve provided in a pipe for extracting the high-temperature liquid from the heat storage container. (4) The heat extraction device according to claim 1, wherein the high temperature liquid is a heat storage liquid. (5) The heat extraction device according to claim 1, wherein the high temperature liquid is a liquid heated by heat exchange with the heat storage liquid. (6) The heat extraction device according to claim 1, wherein the mixing portion is formed integrally with the heat storage container.