JP2009281664A - Deicing device in ice thermal storage system using supercooled water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out energy saving and cost saving by simplifying a complicated piping system in an ice thermal storage system, and to prevent blocking caused by ice by improving an agitating effect in an ice thermal storage tank and facilitating the removal of low temperature cold water. <P>SOLUTION: The deicing device is for the ice thermal storage system sending cold water from the ice thermal storage tank to an air-conditioning load. First piping returning to the storage tank from an icemaker and second return piping returning to the storage tank from the air-conditioning load are converged immediately before the storage tank to form one return water piping. A storage tank side tip of the return water piping forms a vertical nozzle, and a lower end of the vertical nozzle is positioned so that it is immersed in the storage tank below a water surface. A round hole or a slit piercing a pipe wall of the return water piping is formed at a periphery of the vertical nozzle, ice water is blown out of the round hole or slit, and sprayed on the water surface in the storage tank. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an ice heat storage system for storing heat storage ice serving as a cooling heat source for air conditioning, spraying ice for indoor and outdoor ski areas, ice for general cooling and cooling, and the like, in particular, ice using supercooled water. The present invention relates to a defroster of a heat storage system.

  The ice heat storage system, which releases the supercooled state by impacting the supercooled water cooled to a low temperature of 0 ° C or lower with a freezer and produces sherbet ice and stores it in the heat storage tank, has already been widely used. However, in order to take out cold water from the bottom part of a thermal storage tank, it is common to install piping for de-icing in the upper part of a thermal storage tank. In this case, the heat storage tank requires three systems of pipes: an ice supply pipe for introducing ice made, an ice melting pipe (water sprinkling pipe), and a cold water take-out pipe. There was a risk that installation and maintenance would be hindered due to complicated intersections of piping.

The following are related arts related to the present invention.
Japanese Patent Laid-Open No. 6-300347 “Operating method of heat storage system” describes a system that can be switched to three modes of ice heat storage, cold water heat storage, and hot water heat storage. The three systems of piping and cold water take-out piping are installed in a complicated manner, and there are problems that energy loss in the piping path increases, installation work becomes difficult, and installation costs and maintenance costs increase. Further, since the ice made is allowed to fall freely into the atmosphere from the upper part of the heat storage tank through the ice supply pipe, there is a problem that energy loss occurs before reaching the water surface.

The main object of the present invention is to simplify a complicated piping system to save energy and cost.
Another object of the present invention is to enhance the stirring effect in the ice heat storage tank to facilitate the removal of low-temperature cold water and prevent clogging by ice.

  In order to solve the above-mentioned problems, the present invention produces supercooled water with a freezer, ice is made on the secondary side from the supercooled water on the primary side using an ice maker consisting of a supercooled heat exchanger, and iced. An ice melting device for an ice heat storage system is provided that sends ice to a heat storage tank and stores it, and sends cold water from the heat storage tank to an air conditioning load. This ice-melting device is composed of a first return pipe returning from the ice making machine to the heat storage tank and a second return pipe returning from the air conditioning load to the heat storage tank, just before the heat storage tank, and one return water pipe. The heat storage tank side tip portion of the return water pipe forms a vertical nozzle, and the lower end of the vertical nozzle is positioned so as to be immersed below the water surface in the heat storage tank, and the periphery of the vertical nozzle A round hole or slit penetrating the pipe wall of the return water pipe is formed, and ice water is ejected from the round hole or slit and sprayed on the water surface in the heat storage tank.

Based on such a configuration, according to the ice melting device of the present invention,
(1) The piping to the heat storage tank that was three systems becomes two systems, the structure is simplified, and the installation of the piping becomes easy.
(2) Since the ice water piping can be used as it is as the ice melting piping, resource saving, cost saving and maintenance can be achieved.
(3) By reducing the heat loss in the piping path, it becomes possible to take out cold heat at a constant temperature.

(4) Since the lower end of the ice water nozzle (vertical nozzle) is positioned below the water surface of the ice heat storage tank, the loss of jet energy from the ice water nozzle during ice melting should be reduced compared to the conventional free fall case. This is advantageous for taking out low-temperature cold water.
(5) If the size of the ice water nozzle is reduced, the jet energy ejected into the ice heat storage tank can be increased, and the stirring effect in the ice heat storage tank can be enhanced, which is advantageous for taking out low-temperature cold water.
(6) If an opening (round hole or slit) is provided on the side surface of the ice water nozzle, it is possible to prevent the ice water nozzle from being blocked by ice at the time of ice making, which is advantageous for continuous ice making operation.

  The ice making nozzle (vertical nozzle) is bent at the upper end thereof and formed into a substantially L-shape integral with the horizontal pipe portion, which facilitates installation and is advantageous for preventing clogging in the nozzle.

  Hereinafter, with reference to the embodiments of the accompanying drawings, the ice melting apparatus in the ice heat storage system using the supercooled water according to the present invention will be further described.

  FIGS. 1 and 2 are circuit diagrams of an ice melting device in an ice heat storage system using supercooled water according to the present invention. FIG. 1 is during ice making (ice heat storage operation), and FIG. 2 is during ice melting (cold water). It represents the heat storage operation and the hot water storage operation). FIG. 3 is a side view and a sectional view showing a preferred example of the vertical nozzle and the through slit. FIG. 4 is a side view and a cross-sectional view showing a preferred example of a vertical nozzle and a through hole. FIG. 5 is a side view showing ice water outflow from the through slit during ice making. FIG. 6 is a side view showing water outflow from the lower part of the vertical nozzle during ice melting. FIG. 7 is a graph showing that the intake water temperature changes depending on the presence / absence of a vertical nozzle.

  The system 20 in FIGS. 1 and 2 produces supercooled water with the refrigerator 4, and ice is made on the secondary side from the primary supercooled water using an ice making machine composed of the supercooling heat exchanger 3. This is an ice heat storage system in which sherbet-like ice is sent to and stored in the heat storage tank 1 through the ice water nozzle 13, and cold water from the heat storage tank 1 is pumped up by the ice-making heat radiation pump 7 from the water device 5 and sent to the air conditioning load (deicing load) 2. . Reference numeral 6 denotes a water intake pipe, reference numeral 10 denotes an ice water pipe, reference numeral 11 denotes an ice-breaking pipe, reference numeral 12 denotes an ice-water / ice-melting pipe (ice-making and ice-melting pipe), and reference numeral 14 denotes a brine pipe. The switching valve 8 is switched to close when ice is made and open when ice is defrosted. The switching valve 9 is switched to open when the ice is made and closed when the ice is melted.

  According to the present invention, a first return pipe 10 returning from the ice making machine (supercooling heat exchanger) 3 to the heat storage tank 1 and a second return pipe 11 returning from the air conditioning load 2 to the heat storage tank 1 are the heat storage tank. They are merged immediately before to form one return water pipe 12. A front end portion of the return water pipe 12 on the heat storage tank side forms a vertical nozzle 13. The vertical nozzle 13 is installed by reducing the diameter of the return water pipe 12 to the tapered diameter-reduced portion 12a in order to increase the jet flow velocity, and the lower end of the vertical nozzle 13 is immersed below the water surface in the heat storage tank 1. Is positioned.

  3 and 4 show a preferred embodiment of the vertical nozzle 13, which is bent at the upper end thereof and formed into a substantially L shape integral with the horizontal pipe portion of the return water pipe 12. In the example of FIG. 3, a large number of slits 17 are formed around the vertical nozzle 13a so as to penetrate the pipe wall of the return water pipe 12, and in the example of FIG. 4, the pipe wall of the return water pipe 12 is passed around the vertical nozzle 13b. A number of round holes 18 are formed. The opening ratio of the through hole portion is preferably about 30 to 50% in terms of area.

  FIG. 5 shows the ice making operation, and the switching valve 8 is closed and the switching valve 9 is opened. When ice accumulates in the heat storage tank 1, the tip of the vertical nozzle 13a is blocked and ice water does not flow. When the tip of the vertical nozzle 13a is blocked, ice water is ejected from the slit 17 around the vertical nozzle 13a and sprayed on the water surface in the heat storage tank 1. FIG. 6 shows the time of ice-breaking operation, the switching valve 8 is opened, the switching valve 9 is closed, and water flows out from the lower end of the vertical nozzle 13a.

  FIG. 7 shows data confirmed by experiments that the intake water temperature varies depending on whether or not the vertical nozzle according to the present invention is provided. A broken line A represents a temporal change in water intake temperature when water at 8 ° C. is introduced from the return water pipe 12 into a heat storage tank provided with a vertical nozzle with a slit, and a broken line B freely falls without a vertical nozzle. This represents a temporal change in the water intake temperature when water at 8 ° C. is introduced from the return water pipe 12 by the above-described method. About 17 minutes after the start, the water intake temperature when the vertical nozzle is provided (A) is about 1 ° C. lower than the water intake temperature when the vertical nozzle is not provided, and the ice decreases after about 5 hours from the start. Therefore it will reverse.

  In the case of the conventional free fall (B), since the cold water discharged from the ice water nozzle collides with the air and is diffused, the jet energy loss from the ice water nozzle is large and the stirring force in the water tank is reduced. On the other hand, when the vertical nozzle is provided (A), since the lower end of the vertical nozzle is immersed below the water surface in the heat storage tank 1, there is little contact between cold water and air after discharging the ice water nozzle, The jet flow of the nozzle is not diffused, it is possible to reduce the jet energy loss from the ice water nozzle, and low temperature cold water can be taken out. From this, it was confirmed that the vertical nozzle according to the present invention has a certain effect.

  As described above in detail, according to the present invention, the piping to the heat storage tank that was three systems becomes two systems, the structure is simplified, and the installation of the piping becomes easy. Since the ice water piping can be used as it is as the ice melting piping, resource saving, cost saving and maintenance can be achieved. By reducing the heat loss in the piping path, advantages such as being able to take out cold heat at a constant temperature are obtained, and the technical effect is extremely remarkable.

The circuit diagram at the time of ice making of the ice melting apparatus by this invention. The circuit diagram at the time of deicing of the deicing apparatus by this invention. The side surface and sectional drawing showing the suitable example of a vertical nozzle and a penetration slit. The side surface and sectional drawing showing the suitable example of a vertical nozzle and a through-hole. The side view showing the ice water outflow from the penetration slit at the time of ice making. The side view showing the water outflow from the vertical nozzle lower part at the time of ice melting. The graph showing that a water intake temperature changes with the presence or absence of a vertical nozzle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ice thermal storage tank 2 Air conditioning load 3 Ice making machine 4 Refrigeration machine 5 Water intake device 6 Water intake piping 7 Ice making heat radiation pump 8, 9 Switching valve 10 Ice water piping 11 Ice melting piping 12 Ice water / ice melting piping 13 Ice water nozzle 14 Brine piping 17 Slit 18 Round hole

Claims (2)

Produce supercooled water with a refrigerator, make ice on the secondary side from the supercooled water on the primary side using an ice maker consisting of a supercooling heat exchanger, send the iced ice to the heat storage tank, store it, and store it from the heat storage tank Deicing device for an ice heat storage system that sends cold water to an air conditioning load,
The first return pipe returning from the ice making machine to the heat storage tank and the second return pipe returning from the air conditioning load to the heat storage tank are merged immediately before the heat storage tank to form one return water pipe,
The tip of the heat storage tank side of the return water pipe forms a vertical nozzle,
The lower end of the vertical nozzle is positioned so as to be immersed below the water surface in the heat storage tank,
A round hole or slit penetrating the pipe wall of the return water pipe is formed around the vertical nozzle,
An ice removal apparatus in an ice heat storage system using supercooled water, wherein ice water is ejected from the round holes or slits and sprayed onto a water surface in a heat storage tank. The deicing apparatus according to claim 1, wherein the vertical nozzle is bent at an upper end thereof and is formed in a substantially L shape integrated with a horizontal pipe portion.

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