JP3811845B2 - Ice heat storage device for air conditioning - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ice heat storage device for air conditioning that produces ice by utilizing a supercooling phenomenon of water.
[0002]
[Prior art]
Conventionally, an ice heat storage device for air conditioning is known in which sherbet-like ice is produced by phase change from supercooled water obtained by cooling water to below 0 ° C. and stored in an ice heat storage tank.
[0003]
For example, in JP-A-3-241251, supercooled water is released to the atmosphere, dropped, and collided with an impact plate installed below to release supercooling to produce ice. This requires a vertical distance from the impact plate, which restricts the installation height, causes rust to occur in the piping due to an increase in dissolved oxygen, and causes ice in the ice storage tank. There is a problem that the filling rate is difficult to increase, and a problem that the piping is blocked due to the accumulation of ice at a portion where impact occurs, such as a discharge port of an overcooling water or an elbow.
[0004]
In order to solve this problem, in Japanese Patent No. 2811271, a small-diameter pipe is provided in a nozzle-like manner in a large-diameter pipe, and a phase that induces a phase change from supercooled water to ice in the large-diameter pipe. Proposal to install a change induction device.
[0005]
[Problems to be solved by the invention]
However, in the method of the above-mentioned Patent No. 2811271, since it is a method of generating cavitation using a propeller or an ultrasonic vibrator as a phase change induction device, phase change does not occur unless the supercooling water is sufficiently cooled, There is a problem that stable ice cannot be produced. Furthermore, in the above system, ice tends to accumulate on the outer periphery of the nozzle portion of the small diameter pipe, and in order to prevent this, it is necessary to provide a bypass pipe in the large diameter pipe, which has a problem that the structure becomes complicated. ing.
[0006]
The present invention solves the above-described conventional problems, and provides an ice heat storage device for air conditioning that has a simple structure and can stably produce ice without lowering the temperature of supercooled water. The purpose is to do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an ice storage device for air conditioning according to claim 1 of the present invention generates supercooled water by a heat exchanger, and produces sherbet-like ice by phase change from the supercooled water. In the ice heat storage device for air conditioning stored in the ice heat storage tank, a Peltier element disposed on the outer periphery of the supercooled water pipe, a protrusion provided on the cooling side of the Peltier element and projecting into the pipe, A heater disposed on the upstream side of the protruding portion, and a throttle portion is provided in the pipe on the downstream side of the protruding portion, and the supercooling is released by energizing the Peltier element to cool the protruding portion. The invention according to claim 2 is characterized in that ice nuclei are generated and ice is continuously produced. In claim 1, the Peltier element is energized for a predetermined time in the state where there is no ice in the pipe. The invention according to claim 3 is the invention according to claim 1. , Characterized in that the concatenation of the straight pipe in the throttle portion of the downstream piping.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of an ice heat storage device for air conditioning according to the present invention, FIG. 1 (A) is an overall configuration diagram, FIG. 1 (B) is a cross-sectional view of the supercooling release device of FIG. 1 (C) is a diagram showing a modification of the aperture section.
[0009]
In FIG. 1A, the brine cooled by the refrigerator 1 is supplied and circulated to the heat exchanger 3 by the brine circulation pump 2. After the water in the ice heat storage tank 4 is supplied to the heat exchanger 3 through the piping by the water circulation pump 5 through the filtering device 6, the water is cooled to below freezing point (supercooling) in the heat exchanger 3, Sherbet-like ice is produced by the supercooling water release device 7 and supplied into the ice heat storage tank 4. The water below the ice heat storage tank 4 is circulated through the air conditioner 9 by the pump 8 and returned to the ice heat storage tank 4. In the filtering device 6, supercooled water can be produced by removing ice core material in water and increasing the purity of the water.
[0010]
As shown in FIG. 1 (B), the supercooling water release device 7 includes a Peltier element 11 installed on the outer wall of the outlet pipe 10 of the heat exchanger 3, and a needle-like shape is formed on the cooling surface of the Peltier element 11. A copper plate provided with projections 12 is pasted, and the whole is coated with silicon, and the projections 12 are arranged so as to protrude into the outlet pipe 10 by about 2 mm.
[0011]
Two diaphragm plates 13 and 13 having openings (diaphragm portions) 13 a smaller than the inner diameter of the pipe are mounted on the upstream side of the projection 12, and a planar heater 14 is arranged between the two diaphragm plates 13 and 13. Has been established. The temperature at which the heater 14 is in contact with the outlet pipe 10 is preferably about 65 to 100 ° C.
[0012]
Further, a heat exchanger 15 is provided on the heat radiation side of the Peltier element 11, and this heat exchanger 15 is connected to a pipe between the heat exchanger 3 and the filtration device 6 by a bypass pipe 16 having a diameter much smaller than that of the supercooling water pipe. It is connected to the downstream side of the protrusion 12.
[0013]
In FIG. 1 (B), the outlet pipe 10 is throttled by the throttle plate 13, but as shown in FIG. 1 (C), a throttle portion 10a is formed integrally with the outlet pipe 10 and the outer periphery thereof is formed. Alternatively, a linear or planar heater 14 may be provided. Further, the heater 14 may be provided at a position different from the throttle portion 10a.
[0014]
Moreover, in the said embodiment, although the cold water of the heat exchanger 15 is connected to the downstream of the projection part 12, you may make it bypass to the ice thermal storage tank 4 directly, and the upstream is also with the heat exchanger 3. You may connect from anywhere in the piping leading to the ice heat storage tank 4. Further, the Peltier element 11 may be cooled by air cooling.
[0015]
The effect | action of this embodiment which consists of the said structure is demonstrated. When the refrigerator 1 is operated and the temperature of the supercooled water in the outlet pipe 10 is about -0.2 ° C to -0.8 ° C, energization of the Peltier element 11 is started and the temperature of the protrusion 12 is set. Cool to -20 to -30 ° C and energize for 2 to 10 minutes. However, it is preferable to start operation at about -0.6 ° C and stop at about -0.7 ° C. Ice formation begins even at around -0.3 ° C, but ice formation efficiency is low. Further, when the energization time of the Peltier element 11 is lengthened, an ice block clinging to the tip of the protrusion 12 may grow greatly and cause a blockage.
[0016]
When the supercooled water passes through the throttle portions 13a and 10a, a turbulent flow is generated. When the turbulent flow reaches the protruding portion 12, the supercooled water is stimulated in the cooled protruding portion 12, and the supercooling is released. Ice nuclei are generated. This ice nucleus drifts in the vicinity of the protrusion 12 due to the turbulent flow, so that a sharpet-like ice is continuously generated. When the supercooling is released and ice is generated, the temperature in the pipe is in a stable state of -0.1 to 0.0 ° C. Once ice nuclei are generated, the supercooling is released continuously in contact with the ice nuclei. That is, after that, even if the energization of the Peltier element 11 is stopped, the generation of ice is continued.
[0017]
When ice is generated in the vicinity of the protrusion 12, the ice has the property of traveling up the inner surface of the pipe and going up upstream, eventually closing the heat exchange pipe of the heat exchanger 3. Therefore, in the present invention, the upstream side of the protrusion 12 is heated by the heater 14 to prevent the ice from going up.
[0018]
FIG. 2 is a side view showing another embodiment of the ice heat storage device for air conditioning according to the present invention. This embodiment is also applied when the diameter of the outlet pipe 10 is large. Further, a linear or planar heater 14 may be attached to the outer periphery of the outlet pipe 10 on the upstream side of the Peltier element 11 without restricting the outlet pipe 10 as in the above embodiment. Thereby, it is possible to prevent the ice from going up to the heat exchanger 3 side, and it is possible to generate ice stably for a long time.
[0019]
FIG. 3 is a side view showing another embodiment of the ice heat storage device for air conditioning according to the present invention. In the present embodiment, a temperature measuring unit R1 provided with a temperature sensor 17, an ice run-up preventing unit R2 provided with a heater 14, a supercooling release unit R3 provided with a Peltier element 11, a contraction tube ( A supercooling release promoting portion R4 connected with a constricting portion 18 and a supercooling release completion portion R5 including a straight pipe 19 are included.
[0020]
During initial operation, the temperature in the outlet pipe 10 may be -1.5 to -2.0 ° C. When this supercooled water reaches the supercooling release part R3 as it is, the supercooling is released here. Is not performed completely, supercooled water of about -0.8 ° C flows through the pipe, and ice is solidified by an elbow or the like and the pipe is blocked.
[0021]
Therefore, in the present embodiment, the supercooling release promoting part R4, which is connected to the expansion / contraction pipe (throttle part) 18, and the supercooling release completion part R5 including the straight pipe 19 are connected to the downstream side of the supercooling release part R3. . The supercooled water in which the degree of supercooling remains is turbulent in the expansion and contraction pipe 18 of the supercooling release promoting part R4, and the turbulent flow area is secured in the straight pipe 19 of the supercooling release complete part R5. Make sure that the pipes flow in a state where is completely released. In addition, it is desirable to devise icing prevention such as Teflon coating on the inner surface of the pipes of the supercooling release unit R3 and the supercooling release promoting unit R4. Further, a plurality of expansion / contraction tubes 18 may be installed, and in that case, the supercooling can be completely canceled.
[0022]
As a result of the experiment, the pipe length of the ice run-up prevention part R2 for completely canceling the supercooling is pipe diameter × 1 to pipe diameter × 3 (preferably pipe diameter × 2), and the pipe length of the supercooling release part R3 The length is pipe diameter x 4 to pipe diameter x 6 (preferably pipe diameter x 5), and the pipe length of the supercooling release promoting portion R4 is pipe diameter x 1 to 3 (preferably pipe diameter x 2). It has been confirmed that the pipe length of the release completion portion R5 is pipe diameter × 3 to pipe diameter × 5 (preferably pipe diameter × 4).
[0023]
【The invention's effect】
As is clear from the above description, according to the present invention, since ice making is performed by releasing the supercooling in the pipe, the ice can be directly transported to the ice heat storage tank, and the blockage by freezing in the pipe is possible. The ice filling rate can be increased to the limit of the effective capacity of the ice storage tank. Furthermore, it is possible to produce ice with a simple structure and stable without reducing the temperature of the supercooling water.
[Brief description of the drawings]
FIG. 1 shows an embodiment of an ice heat storage device for air conditioning according to the present invention, FIG. 1 (A) is an overall configuration diagram, FIG. 1 (B) is a cross-sectional view of the supercooling release device of FIG. 1 (C) is a diagram showing a modification of the aperture section.
FIG. 2 is a side view showing another embodiment of the ice heat storage device for air conditioning according to the present invention.
FIG. 3 is a side view showing another embodiment of the ice heat storage device for air conditioning according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 ... Heat exchanger 4 ... Ice thermal storage tank 10 ... Outlet piping 10a, 13a, 19 ... Restriction part 11 ... Peltier element 12 ... Protrusion part 14 ... Heater

Claims (3)

In an air-conditioning ice heat storage device that generates supercooled water by a heat exchanger, produces sherbet-like ice from the subcooled water by phase change, and stores it in an ice heat storage tank, it is placed on the outer periphery of the supercooled water piping. A Peltier element, a protrusion provided on the cooling side of the Peltier element, protruding into the pipe, and a heater disposed on the upstream side of the protrusion , and a pipe on the downstream side of the protrusion An ice heat storage device for air conditioning is characterized in that a constricted portion is provided, and the Peltier element is energized to cool the projection to release the supercooling to generate ice nuclei and continuously produce ice. The air-conditioning ice thermal storage device according to claim 1, wherein the ice in the pipe, characterized in that the energizing predetermined time Peltier element in the absence. Air-conditioning the ice heat storage device according to claim 1, characterized in that the concatenation of the straight pipe in the throttle portion of the downstream piping.

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