JPH10170032A - Ice heat storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a device, to improve the maintainability of it, to reduce costs and to improve efficiency by spouting supercooled water being generated by a heat exchanger from the side surface part of a thermal storage tank to a supercooling relieving device. SOLUTION: Water is taken in from an ice storage tank 1 by a pump, the water is fed to the supercooled water generating heat exchanger 3 and the water is cooled by the refrigerating machine 6 of the heat exchanger 3 to be the supercooled water. the supercooled water is spouted from the outlet hole of the heat exchanger 3 and the spouted supercooled water is spouted to the inside of the ice storage tank 1 going through a hole 7 arranged to the side surface of the ice storage tank 1. The supercooled water is collided with plate form supercooling releasing device 4 placed obliquely to the spouting direction of the supercooled water being converted to ice. Therefore, the down sizing of the device and reduction of the cost of it are enabled by not mounting supercooled water generating heat exchanger 3 above the ice storage tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device, and more particularly to an ice heat storage device that generates ice using midnight power and uses it for daytime cooling.

[0002]

2. Description of the Related Art Ice heat storage devices can be broadly classified into a static type for generating hard ice around a pipe and a dynamic type for generating soft ice such as a sherbet. The static type has an advantage that the heat storage tank can be reduced in size, but has a drawback that the operating cost becomes large because additional ice making is difficult.

On the other hand, a dynamic type capable of producing sherbet-like ice has an advantage that additional ice making is possible. There are various means for generating sherbet-like ice, but the simplest method is to cool water in a heat exchanger to generate supercooled water and release the supercooled water from the supercooled state. A device for storing ice in a tank is known (for example, Japanese Utility Model Laid-Open No. 1-136832).

In a conventional dynamic type ice heat storage device, a heat exchanger for generating supercooled water is installed in an upper portion of a tank, and the supercooled water is supplied from the upper portion of the tank to a supercooling release device in the tank or to a water surface (actually open flat 4- No. 43742), or to a supercooling release device installed in the upper part of the tank (JP-A-6-147561).

[0005] For this reason, the dynamic type requires a larger device than the static type, or it is difficult to seal the device, so that frequent water quality management has to be performed. But,
Since the dynamic type was originally an air conditioner for large-scale buildings, the increase in size and frequent water quality management did not become a major problem. Further, in the dynamic type ice heat storage device, the stability of ice making is slightly lacked due to the pump sucking the supercooled water, and the efficiency may be deteriorated in some cases.

[0006]

However, in air conditioning for small and medium-sized buildings, the size and maintainability of the ice heat storage device are important. is there. Therefore, an object of the present invention is to provide an ice heat storage device that is reduced in size and improved in maintainability, and is capable of reducing costs and increasing efficiency.

[0007]

According to a first aspect of the present invention, there is provided a heat exchanger for converting water into supercooled water using a refrigerator, and a heat exchanger produced by the heat exchanger. Ice heat storage including a supercooling release device that generates ice from supercooled water, a heat storage tank that stores ice generated by the supercooling release device, and a pump that sends water from the heat storage tank to the heat exchanger. In the apparatus, the supercooling release device is disposed in the heat storage tank, and supercooled water generated by the heat exchanger is ejected from a side surface of the heat storage tank toward the supercooling release device. It is characterized by the following.

According to the first aspect of the present invention, for example, as shown in FIG. 1, since the supercooled water is jetted from the side plate side of the heat storage tank 1 to the subcooling release device 4 in the tank, No extra space is required above the heat storage tank 1. Ice that grows in the direction opposite to the supercooled water jet direction can accumulate for the distance until it reaches the supercooled water jet port on the side plate, and the effective utilization rate of the tank space (width of the tank) is high.

Since the growth direction of the ice and the direction of the jet of the supercooled water are opposite to each other, the kinetic energy held by the supercooled water can compress the ice in the tank and increase the filling rate of the volumetric ice.

According to a second aspect of the present invention, in the supercool release device, a metal plate portion for receiving the jetted supercooled water, and an ice block for preventing entry of the ice block into a water inlet of the water pump. An anti-reflection filter, wherein the metal plate portion and the ice block prevention filter are connected to each other via a poor heat conduction member.

According to the second aspect of the present invention, for example, as shown in FIGS. 3A and 3B, the supercooling canceling device 4A conducts heat conduction between the metal plate 12 and the ice nucleus intrusion prevention filter 13. Because the structure is connected via the defective body 14, the collision surface of the supercooled water is a metal plate with good heat conduction,
Supercooling water release efficiency is high. With the ice nucleus intrusion prevention filter, there is no fear that ice blocks in the tank enter the water supply line to the pump 2. Although the temperature of the metal plate 12 becomes lower than the temperature of the ice due to the collision of the supercooled water, the filter 13 for preventing ice nucleus intrusion is connected via the poor heat conduction body 14, so that the filter 13
Does not fall below the ice temperature. Therefore, the filter 13
The generation of the supercooled water due to the cooling of the water is eliminated, the probability of the supercooled water being sucked into the water supply pipeline is reduced, and the reliability and efficiency of the system are increased.

Further, the invention according to claim 3 is characterized in that a nozzle for causing supercooled water to collide with the supercooling release device is mounted at an outlet of the supercooled water of the heat exchanger. According to the third aspect of the present invention, for example, FIGS.
As shown in the figure, since the nozzle 15 for causing the supercooled water to collide with the subcooling release device 4 is attached to the outlet of the heat exchanger 3, the supercooled water is supplied within the flow rate range of the supercooled water that enables stable ice making. It is possible to reliably cause the collision with the supercooling release device 4.

That is, the flow rate Q of the supercooled water and the stable ice making time T
The following equation Tc = B1 / (B2 + B3 × Q 0.5) (B1, B2, B3 are the dimensions of the heat exchanger 3, determined constants by the inner surface roughness) between the c is related, supercooled water flow It is determined by the heat exchanger 3. On the other hand, if the supercooled water does not collide with the release device 4 efficiently, the supercooled water is sucked into the pump 2 again, and the stability of the ice making is reduced. Therefore, both can be compatible by adjusting the length and diameter of the nozzle 15. Spreading of the jet is eliminated, and supercooled water is prevented from scattering on the lid and the heat storage tank side plate, and stable ice making can be performed.

Further, the invention according to claim 4 is characterized in that water for melting the ice is jetted from the side surface of the heat storage tank into the heat storage tank. According to the invention as set forth in claim 4, for example, as shown in FIG. 5, water for melting ice is blown into the heat storage tank 1 from the side surface (side plate) of the heat storage tank 1. No space is required at the top of the tank, and the water for thawing (scattered water H) can be poured into the ice in the tank in a shower-like manner by colliding with the supercooling release device 4 using the force of the jet. Therefore, not only the size can be reduced, but also the ice can be efficiently melted.

[0015] The invention according to claim 5 is characterized in that the heat exchanger is a plate heat exchanger, and the refrigerant and the water flow in parallel. According to the fifth aspect of the present invention, since a plate type (laminated type) is used as the supercooled water generating heat exchanger and the refrigerant and the water are flowed in parallel, stable ice making can be realized. Space can be made compact.

That is, even if the conventional apparatus is enlarged, the heat exchanger for generating supercooled water for stable ice making is
A double tube type or shell and tube was used, and brine was used as a medium for cooling water. However, even if a compact plate type is used as the heat exchanger for generating supercooled water, the refrigerant and the water flow in parallel, so that excessive cooling is eliminated and stable ice making can be realized.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings.

(1) First Embodiment FIG. 1 is a block diagram of an ice heat storage device C1 of this embodiment. As shown in FIG. 1, the ice heat storage device C1 has a wide heat storage tank 1, a pump 2, a heat exchanger 3, a subcooling release device 4, and an ice nucleus that enters the inlet of the pump. An intrusion prevention filter 5 for preventing water and a refrigerator 6 for supercooling water in the heat exchanger 3 are provided.

Further, a hole 7 for jetting supercooled water is formed on a side surface of the heat storage tank 1, and a seal member 8 for preventing water in the heat storage tank 1 from leaking to the outside is mounted in the hole 7. Also,
The supercooled water generating heat exchanger 3 is supported by a support 9.

In such a configuration, ice making is performed as follows. That is, the pump 2 sucks water from the heat storage tank 1,
Water is supplied to the heat exchanger 3 for generating supercooled water. The heat exchanger 3
In, the refrigerator 6 cools the water and changes it to supercooled water. The supercooled water spouted from the outlet of the heat exchanger 3 spouts into the heat storage tank 1 through the hole 7 and collides with the plate-shaped supercooling release device 4 arranged obliquely to the jetting direction. Turns into ice. Ice I is accumulated in the heat storage tank 1 by repeating such an operation. In the present embodiment, since the heat storage tank 1 can be made to have a nearly closed structure, the heat storage material (water or aqueous solution) in the tank can be prevented from decay, and the water quality can be easily managed.

[Modification] The present embodiment shown in FIG. 2 is a modification of the first embodiment. FIG. 2 shows a brine circuit 10 and a second pump 2A for circulating a liquid used in an indirect cooling system instead of a direct expansion type ice heat storage system in which the above-described refrigerant is directly cooled by a refrigeration cycle as means for generating supercooled water. And an ice heat storage device C2 using the second heat exchanger 3A. With this configuration, since the brine (secondary refrigerant) has a large heat capacity, there is an effect that the temperature control of the cycle is facilitated.

(2) Second Embodiment FIG. 3 (A) is a block diagram of an ice heat storage device C3 of this embodiment, and FIG. 3 (B) is a first and a second embodiment of the supercooling release device 4A.
It is an enlarged view of 2nd metal plate 12,13 etc. Note that, in the following description, the parts described so far are denoted by the same reference numerals, and redundant description will be omitted.

The difference between the present embodiment and the first embodiment is that the supercooling release device 4 of the first embodiment is made of a single metal plate, while the supercooling release device of the present embodiment is different from that of the first embodiment. Device 4A
Is a point configured as follows. Other points are the same. That is, as shown in FIGS. 3A and 3B, the subcooling release device 4A of the ice heat storage device C3 includes a first metal plate 12 and a second metal plate 13 having a wire mesh 13a for preventing entry of ice nuclei. And a plastic joint 14 or the like as a heat conduction defective body connecting the first and second metal plates 12 and 13.

In such a configuration, the pump 2 sends water from the heat storage tank 1 to the heat exchanger 3 for generating supercooled water. In the heat exchanger 3, the refrigerator 6 cools the water to change it into supercooled water. The supercooled water is jetted out of the hole 7 on the side of the heat storage tank into the tank, and collides with the first metal plate 12 of the supercooling release device 4A. The supercooled water releases the state on the first metal plate 12 and becomes ice, and accumulates in the heat storage tank 1.

On the other hand, the water is sucked into the pump 2 again through the wire mesh 13a attached to the second metal plate 13. However, since the second metal plate 13 and the first metal plate 12 are connected by the joint 14 having poor heat conduction, even if the first metal plate 12 is cooled by contact with supercooled water, the second metal plate The plate 13 is not cooled so much. Therefore, the second metal plate 13 does not bring the water in the tank into a supercooled state, and the probability that the supercooled water is sucked into the pump 2 is reduced. In the present embodiment, the lower side of the supercooling release device 4A is a metal plate (second metal plate 13), but the lower side may be made of a plastic having a high mechanical strength and poor heat conduction. .

(3) Third Embodiment FIG. 4A is a block diagram of an ice heat storage device C4 according to this embodiment, and FIGS. 4B and 4C are enlarged views of a main part. The difference between this embodiment and the first embodiment is that a nozzle 15 having a cross-sectional area decreasing toward the jetting direction is provided at the supercooled water jet outlet of the supercooled water generating heat exchanger 3 with a water-repellent packing 16. This is the point that was mounted via. 16A is a cylinder for preventing collision of ice pieces.

In such a configuration, the pump 2 sends water from the heat storage tank 1 to the heat exchanger 3 for generating supercooled water. In the heat exchanger 3, the refrigerator 6 cools the water to change it into supercooled water. The supercooled water is jetted into the tank by the nozzle 15 attached to the outlet of the heat exchanger 3 and collides with the supercool release device 4. The outlet diameter and length of the nozzle 15 can be adjusted so that the supercooled water collides with the subcooling release device 4 and the jet is not disturbed in the tank. The supercooled water colliding with the subcooling release device 4 changes to ice and accumulates in the heating tank 1.

(4) Fourth Embodiment FIG. 5 is a block diagram of an ice heat storage device C5 of this embodiment. As shown in FIG. 5, the ice heat storage device C5 comprises a heat storage tank 1, a pump 2, a supercooled water generating heat exchanger 3, a subcooling canceling device 4, an ice nucleus melting heat exchanger 17, and expansion valves 18a, 18b. ,
A heat storage unit consisting of 18c, a solenoid valve 19, etc., and an outdoor unit consisting of an outdoor heat exchanger 22, a compressor 23, etc.
And the indoor units 21a and 21b.

In such a configuration, the pump 2 can be used during ice heat storage.
Supplies water from the heat storage tank 1 to the heat exchanger 3. Heat exchanger 3
In this case, heat exchange occurs between the refrigerant that has been throttled and discharged by the expansion valve 18a from the compressor 23 through the outdoor heat exchanger 22 and the ice nucleus melting heat exchanger 17, and supercooled water is generated. The supercooled water is jetted out of the hole 7 of the heat storage tank 1 into the heat storage tank 1, and is changed into ice by the subcooling release device 4.

On the other hand, during cooling, the refrigerant flows from the compressor 23 → the outdoor heat exchanger 22 → the heat exchanger 17 for melting ice nuclei → the solenoid valve 19.
→ After flowing to the indoor units 21a and 21b, the flow returns to the compressor 23 again. After flowing from the heat storage tank 1 to the pump 2, the water exchanges heat with the refrigerant in the heat exchanger 17 and is heated. Then, it flows to the heat exchanger 3 and is jetted out of the hole 7 on the side surface of the tank 1 into the tank. The jetted water collides with the supercooling / supercooling canceling device 4, becomes scattered water H, and falls onto ice in the heat storage tank 1.
Melts the ice in the tank efficiently.

(5) Fifth Embodiment FIGS. 6A and 6B are a block diagram and an enlarged view of a main part of an ice heat storage device C6 of this embodiment. As shown in FIG. 6A, the ice heat storage device C6 includes a heat storage tank 1, a pump 2, a heat exchanger 3B for generating supercooled water, a subcooling release device 4, and a filter 5 for preventing ice nuclei from entering. And the heat exchanger 3B
And a refrigerator 6 for supercooling water.

As shown in FIG. 6B, the heat exchanger 3
B is a plate type (laminated type) heat exchanger, in which the refrigerant flows in from the inlet 31 and flows out from the outlet 32. On the other hand, water
The water flows in from the inlet 33 and flows out from the outlet 34, and the flows of the water and the refrigerant are parallel.

In such a configuration, the pump 2 sends water from the heat storage tank 1 to the supercooled water generating heat exchanger 3B. In the heat exchanger 3B, the refrigerator 6 cools the water to change it into supercooled water. The supercooled water is jetted from the outlet 34 of the heat exchanger 3B into the heat storage tank 1 and collides with the subcooling release device 4 to change into ice, and ice is accumulated in the tank.

[0034]

As described above, according to the first aspect of the present invention, since the heat exchanger for generating supercooled water is not installed at the upper part of the tank as in the prior art, the size and cost of the apparatus can be reduced. it can. According to the second aspect of the present invention, it is possible to prevent re-cooling by the release plate (sub-cooling release device) in the heat storage tank and prevent the supercooled water from entering the pump suction port. For this reason, stability of ice making can be improved and system efficiency can be improved.

According to the third aspect of the present invention, since the supercooled water can be efficiently released by the supercooling release device regardless of the type of the heat exchanger, the stability of ice making and the system efficiency can be improved. . According to the fourth aspect of the present invention, since the water for melting ice is ejected from the side of the heat storage tank, the reduction in power consumption during ice-based cooling by efficient defrosting that enables the downsizing of the apparatus can be expanded. . According to the fifth aspect of the present invention, the size of the system can be reduced by ice making in the plate heat exchanger.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of the second embodiment.

FIG. 3 is a block diagram and a main part enlarged view of the third embodiment.

FIG. 4 is a block diagram and a main part enlarged view of the fourth embodiment.

FIG. 5 is a block diagram of the fifth embodiment.

FIG. 6 is a block diagram and a main part enlarged view of the sixth embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat storage tank 2 pump 3 heat exchanger for generating supercooled water 4 subcooling release device 5 filter 6 refrigerator 7 hole provided on side of heat storage tank 8 sealing material

Claims (5)

[Claims] 1. A heat exchanger for converting water to supercooled water using a refrigerator, a supercooling release device for generating ice from supercooled water generated by the heat exchanger, and the supercooling release device In the ice heat storage device including a heat storage tank that stores the ice generated by the above, and a pump that sends water from the heat storage tank to the heat exchanger, the supercooling release device is disposed in the heat storage tank, An ice heat storage device, wherein supercooled water generated by the heat exchanger is jetted from a side portion of the heat storage tank toward the subcooling release device. 2. The supercooling release device includes a metal plate portion that receives the jetted supercooled water, and an iceblock prevention filter that prevents entry of iceblocks into a water inlet of the water pump. 2. The ice heat storage device according to claim 1, wherein the metal plate and the ice block prevention filter are connected to each other via a poor heat conduction member. 3. The ice heat storage device according to claim 1, wherein a nozzle for causing supercooled water to collide with the supercooling release device is mounted at an outlet of the supercooled water of the heat exchanger. . 4. The ice heat storage device according to claim 1, wherein water for melting the ice is jetted from a side surface of the heat storage tank into the heat storage tank. 5. A heat exchanger for converting water to supercooled water using a refrigerator, a supercooling release device for generating ice from the supercooled water generated by the heat exchanger, and the supercooling release device. An ice heat storage device comprising: a heat storage tank for storing ice generated by the above; and a pump for sending water from the heat storage tank to the heat exchanger, wherein the heat exchanger comprises a plate-type heat exchanger, and includes a refrigerant and water. An ice heat storage device characterized by flowing in a parallel flow.