JP2005188896A - Ice thermal storage method and ice thermal storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent supercooled water from freezing on the way of circulation and eliminate an installation restriction of an ice thermal storage device. <P>SOLUTION: A cold water/ice water circulation line 20 including an ice water generator 17 for pumping cold water 15 from an ice thermal storage tank 12 and circulating as ice water in the ice thermal storage tank is provided. The ice water generator, including an evaporator 1 of a refrigerating machine 4 for supercooling the cold water, and a supercooling releasing part 25 for releasing supercooling and generating the ice water, discharges the ice water and delivers to the ice heat storage tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ice heat storage method and apparatus using water as a heat medium.

  2. Description of the Related Art Conventionally, there is an ice heat storage device in which water is used as a heat medium when air conditioning a building or the like and water is stored in a heat storage tank in an ice water state.

  As a conventional ice heat storage device, for example, there is one shown in Patent Document 1, which is outlined in FIG.

  In FIG. 7, 1 is an evaporator that also serves as a supercooler, 2 is a condenser, 3 is a compressor, 4 is a refrigerator, 5 is a cooling tower, and 12 is an ice heat storage tank.

  The evaporator 1, the condenser 2, and the compressor 3 constitute a closed refrigerator 4. Further, water is circulated between the cooling tower 5 and the condenser 2 by a cooling water pump 6 to form a cooling water system 7. Further, between the evaporator 1 and the ice heat storage tank 12, water as a refrigerant is circulated by a cold water pump 8 to form a cold water system 13. The cold water system 13 includes a water distribution pipe 11 for circulating cold water. The water distribution pipe 11 is provided with the cold water pump 8, the preheat exchanger 9, and an ice core filter 10 from the upstream side.

  In the refrigerator 4, the refrigerant in the refrigerator 4 is condensed in the condenser 2 by the cooling water system 7, and the refrigerant is evaporated in the evaporator 1. The cold water circulated by the cold water pump 8 is supercooled (−2 ° C.) by the evaporator 1. The supercooled water is discharged to the ice heat storage tank 12 through the water distribution pipe 11, and the supercooled state is released when discharged, and is stored in the ice heat storage tank 12 as frozen sherbet-like ice water. The preheat exchanger 9 cools the cold water to a required temperature so that the cold water does not freeze in the distribution pipe 11, and the ice core filter 10 removes the ice in the cold water, so that the ice does not flow into the evaporator 1. It is what you do.

  The ice heat storage tank 12 stores chilled heat by storing sherbet-like ice 14. When cooling such as cooling is required, cold water 15 obtained by melting ice is extracted and supplied to an air conditioner (not shown) or the like.

  In the conventional ice heat storage device described above, the supercooled water in an unstable state is led from the evaporator 1 to the ice heat storage tank 12 through the water distribution pipe 11, so that it is excessive due to an impact in the water distribution pipe 11. There is a possibility that the cooling water may freeze, and in the case of freezing, the water distribution pipe 11 is clogged, and further, the freezing propagates to the evaporator 1, the evaporator 1 freezes, and the ice heat storage device must be stopped. There is a risk of reaching.

  In addition, the conventional ice heat storage device is configured to discharge from the water distribution pipe 11 to the ice heat storage tank 12 to release the supercooled state, so that the discharge position of the water distribution pipe 11 is located above the ice heat storage tank 12. However, there were problems such as restrictions on the installation of ice heat storage devices.

Japanese Patent No. 3122223

  In view of such circumstances, the present invention prevents supercooled water from freezing in the middle of circulation, and removes the installation restriction of the ice heat storage device.

  The present invention includes an ice water generator that includes a cold water / ice water circulation line that sucks cold water from an ice heat storage tank and circulates the ice water into the ice heat storage tank as ice water, and the ice water generator sucks cold water from the ice heat storage tank The present invention relates to an ice heat storage method in which ice water is generated immediately after supercooling to generate ice water and sent to the ice heat storage tank through the ice water circulation line in the ice water state, and the mode of the refrigerant flowing through the cold water / ice water circulation line is The present invention relates to an ice heat storage method configured to be cooling water and ice water.

  The present invention further includes a cold water / ice water circulation line that includes an ice water generator, sucks cold water from the ice heat storage tank, and circulates the ice water as ice water to the ice heat storage tank. The ice water generator is a refrigerator that supercools the cold water. This invention relates to an ice heat storage device that has an evaporator and a supercool release unit that generates ice water by releasing supercooling, and discharges ice water and sends it to the ice heat storage tank.

  Further, according to the present invention, the supercooling release portion is connected to the flow velocity accelerating portion so that the direction of the flow velocity accelerating portion and the flow velocity accelerating portion connected to the evaporator of the ice water generator are different from each other. A supercooled state in which the supercooled water flowing out from the evaporator is accelerated by the flow velocity accelerating unit and the flow direction is changed in the outlet water chamber unit. The flow velocity accelerating portion is provided offset from the center of the outlet water chamber so that a swirling flow is generated in the outlet water chamber. In addition, a heating means is provided at least at the downstream end portion of the flow velocity accelerating portion, and a heat insulating portion is formed in a continuous portion between the flow velocity accelerating portion and the outlet water chamber portion. This relates to the ice heat storage device.

  According to the present invention, the ice water generator includes a cold water / ice water circulation line that sucks cold water from an ice heat storage tank including the ice water generator and circulates the ice water as ice water to the ice heat storage tank, and the ice water generator draws cold water from the ice heat storage tank. After sucking and overcooling, the supercooling is released to generate ice water, and the ice water is sent to the ice heat storage tank through the ice water circulation line, so that the line is not circulated in an unstable supercooled water state. Therefore, a situation where icing occurs during the flow of the line due to impact or the like can be avoided, and a stable operation of the ice heat storage device can be realized.

  According to the present invention, there is further provided a cold water / ice water circulation line that includes an ice water generator and sucks cold water from the ice heat storage tank and circulates the ice water as ice water to the ice heat storage tank. The ice water generator is a freezer that supercools the cold water. And a supercooling release unit that generates ice water by releasing supercooling, and discharges ice water and sends it to the ice heat storage tank, so there are restrictions on the arrangement of the ice water generator and the ice heat storage tank. Therefore, it can be installed in a narrow place, and there are no restrictions such as routing of the pipes constituting the line.

  Further, according to the present invention, the supercooling release portion is provided in the flow velocity accelerating portion so that the direction of the flow velocity accelerating portion and the flow velocity accelerating portion connected to the evaporator of the ice water generator are different from each other. A supercooling water flowed out from the evaporator is accelerated by the flow velocity accelerating portion and the flow direction is changed in the outlet water chamber portion. Since the state is configured to be released, the flow velocity accelerating portion is provided offset with respect to the center of the outlet water chamber portion, and is configured to generate a swirling flow in the outlet water chamber portion. The supercooling state is effectively released with a simple configuration.

  Furthermore, according to the present invention, a heating means is provided at least at the downstream end portion of the flow velocity accelerating portion, and a heat insulating portion is formed at a continuous portion between the flow velocity accelerating portion and the outlet water chamber portion, so that freezing is caused. It exhibits excellent effects such as enabling stable operation of the ice heat storage device without propagating to the flow velocity accelerating portion.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a first embodiment of an ice heat storage device according to the present invention. In the figure, the same components as those shown in FIG.

  The heat exchanger 21 of the condenser 2, the heat exchanger 22 of the evaporator 1, and the compressor 3 are connected to a refrigerator pipe 18, and the condenser 2 and the evaporator 1 of the refrigerator pipe 18 are connected to each other. An expansion valve 19 is provided between them to form a closed circuit. A heat medium is circulated through the closed circuit, cooled by the heat exchanger 21 of the condenser 2, condensed, vaporized by the expansion valve 19, and chilled water flowing through the evaporator 1 in the evaporator 1. And is circulated from the heat exchanger 22 to the compressor 3.

  The ice water generator 17 is constituted by the evaporator 1 and the supercooling release unit 25, and the ice heat storage tank 12 and the suction side of the ice water generator 17 are connected by a cold water suction pipe 23, and the discharge of the ice water generator 17 is performed. The cold water suction pipe 23 is provided with a cold water preheater 40 which is connected to the side by an ice water return pipe 24. The ice water generator 17 includes the supercooling release unit 25 on the discharge side, and the ice water return pipe 24 is connected to the supercooling release unit 25. The ice water return pipe 24 is preferably made of a synthetic resin or a metal having a synthetic resin layer such as fluorine resin (polytetrafluoroethylene) or polyethylene formed on the inner surface.

  The chilled water sucked up by the chilled water pump 8 is preheated by the chilled water preheater 40, then sent to the ice water generator 17, cooled to a supercooled state by the heat exchanger 22, and discharged from the ice water generator 17. When passing, the supercooling release unit 25 is passed. In the cold water preheater 40, when ice particles are mixed in the cold water entering the ice water generator 17, the supercooled water is frozen in the ice water generator 17 using the ice particles as a nucleus, so that the ice particles are dissolved. It is for making it happen. When passing through the supercooling release unit 25, the supercooled state is released, freezes, and is discharged from the ice water generator 17 as ice water, and the ice water generator 17 functions as an ice water generator. Ice water is circulated to the ice heat storage tank 12 through the ice water return pipe 24, and ice is stored in the ice heat storage tank 12. Thus, the cold water pump 8, the cold water suction pipe 23, the ice water generator 17, and the ice water return pipe 24 constitute a cold water / ice water circulation line 20.

  The ice water return pipe 24 circulates not the unstable supercooled water but the stable ice water, so that even if an impact or the like is received during the circulation, the ice water return pipe 24 does not freeze and clog the ice water return pipe 24. . Further, in FIG. 1, the ice water generator 17 and the ice heat storage tank 12 are arranged one above the other. However, in practice, the ice water generator 17 and the ice heat storage tank 12 may be arranged on the same horizontal plane. There are no restrictions, and restrictions on the routing of piping and restrictions on installation locations are lifted.

  When cold heat is used, cold water 15 is extracted from the ice heat storage tank 12 and supplied to an air conditioner (not shown).

  The supercooling release unit 25 will be described with reference to FIGS.

  The supercooling release unit 25 mainly includes a flow speed increasing unit 26, a heat insulating unit 27, and an outlet water chamber unit 28.

  The flow velocity accelerating portion 26 is connected to the discharge side end of the evaporator 1, has a substantially funnel shape in which the flow path cross section gradually decreases toward the downstream, and the flow velocity accelerating portion 26 has the downstream end of the flow velocity accelerating portion 26. An outlet water chamber 28 is continuously provided. The flow velocity accelerating portion 26 has a flange portion 26 a and is detachable from the evaporator 1.

  The outlet water chamber portion 28 is a hollow tube having an axial center extending in the vertical direction. The flow velocity accelerating portion 26 communicates with a lower portion of the outlet water chamber portion 28 and a discharge hole 29 is provided at the upper end. . A heater 31 is wound around the outer periphery of the downstream end of the flow velocity accelerating portion 26, and the downstream end of the flow velocity accelerating portion 26 is heated to, for example, about 20 ° C. or more, so that the flow velocity accelerating portion 26 is heated. And a heat insulating part 27 is formed at the connecting part of the outlet water chamber part 28. The heater 31 may be wound over the entire length of the flow velocity accelerating portion 26. Furthermore, as the heat source of the heater 31, various resistance heating elements, steam, heated water, oil, etc. can be adopted.

  When the flow velocity accelerating portion 26 is made of metal, a resin layer 32 of a synthetic resin for preventing freezing, such as a fluorine resin, is formed on the inner surface of the flow velocity accelerating portion 26. Alternatively, the flow speed increasing portion 26 itself may be made of a synthetic resin. A synthetic resin layer 33 made of synthetic resin for preventing freezing, for example, fluorine resin, is also formed on the discharge side end face of the evaporator 1. In the figure, 34 is an outlet through which the supercooled water flows out.

  The outlet water chamber 28 is made of synthetic resin or metal. When the outlet water chamber 28 is made of metal, a synthetic resin for preventing freezing, for example, a synthetic resin layer 35 made of fluorine resin, is provided on the inner surface. Form. The discharge hole 29 includes a flange portion 29a, and the ice water return pipe 24 is detachably connected through the flange portion 29a.

  The supercooled water that has flowed out of the evaporator 1 is accelerated by passing through the flow velocity accelerating unit 26, and further, the direction of the flow is changed upward in the outlet water chamber 28, so that the supercooled state is changed. Releases and freezes. The temperature rises to 0 ° C. by freezing, and the frozen ice has a small specific gravity, so it rises in a sherbet shape (ice water) together with cold water. Once there is freezing in the outlet water chamber 28, the ice in the outlet water chamber 28 becomes seed ice, and the supercooled water flowing into the outlet water chamber 28 is sequentially released. In order to promote freezing, freezing assisting means such as an ultrasonic vibrator may be installed at a required position of the outlet water chamber 28.

  The heat insulating part 27 heats the downstream end of the flow velocity accelerating portion 26 to form a heat insulating portion so that icing in the outlet water chamber portion 28 does not propagate to the flow velocity accelerating portion 26. . Thus, 0 ° C. ice water with a stable state is discharged from the discharge hole 29. Since the ice water flowing through the ice water return pipe 24 is 0 ° C., the ice water return pipe 24 is not clogged by freezing.

  The supercooling release portion 25 can be separated from the evaporator 1 by the flange portion 26a and from the ice water return pipe 24 by the flange portion 29a, so that it can be unitized and handled and assembled. , Improving maintainability.

  The flow velocity accelerating unit 26 may be configured to directly connect to the ice water return pipe 24 without the outlet water chamber 28.

  5 and 6 show the supercooling release unit 39 according to the second embodiment. In the figure, parts equivalent to those shown in FIG. 2 and FIG. The explanation is omitted.

  The shaft center 36 of the flow velocity increasing portion 26 is offset with respect to the center 37 of the outlet water chamber portion 28.

  When the axial center 36 is offset with respect to the center 37, the supercooled water that has flowed into the outlet water chamber portion 28 swirls within the outlet water chamber portion 28. When the supercooling water swirls in the outlet water chamber 28, the supercooling state is effectively canceled and icing occurs. Further, when the swirl flow 38 is generated, ice gathers at the center, and the ice becomes seed ice. In addition, the water is smoothly discharged as ice water from the discharge hole 29 without staying in the outlet water chamber portion 28, and further, ice is collected at the center so that ice does not adhere to the tube wall, and freezing grows. The exit water chamber 28 is not frozen. Further, the same result can be obtained by maintaining the swirling flow in the discharge hole 29 and the downstream side thereof.

  In the first and second embodiments, the axis of the outlet water chamber 28 is set in the vertical direction, but it may be horizontal or oblique.

It is a system configuration figure showing an embodiment of the invention. It is a side view of the supercooling cancellation | release part in 1st Embodiment. It is a top view of the supercooling cancellation | release part in 1st Embodiment. It is the expanded side view which fractured | ruptured a part of this supercooling cancellation | release part. It is a side view of the supercooling cancellation | release part in 2nd Embodiment. It is a top view of the supercooling cancellation | release part in 2nd Embodiment. It is a system configuration diagram of a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporator 4 Refrigerator 12 Ice heat storage tank 14 Ice 15 Cold water 17 Ice water generator 20 Chilled water / ice water circulation line 21 Heat exchanger 22 Heat exchanger 23 Chilled water suction pipe 24 Ice water return pipe 25 Supercool release part 26 Flow speed acceleration Section 27 Thermal insulation section 28 Outlet water chamber section 31 Heater 32 Resin layer 33 Synthetic resin layer 36 Axis center 38 Swirling flow 39 Supercooling release section 40 Ice water preheater

Claims (6)

  A cooling water / ice water circulation line that sucks cold water from an ice heat storage tank including an ice water generator and circulates as ice water to the ice heat storage tank is provided, the ice water generator sucks cold water from the ice heat storage tank, and after being supercooled An ice heat storage method comprising: immediately releasing the supercooling to generate ice water, and sending the ice water to the ice heat storage tank through an ice water circulation line in an ice water state.   The ice heat storage method according to claim 1, wherein the refrigerant flowing in the cold water / ice water circulation line is configured to be cooling water and ice water.   A cooling water / ice water circulation line that includes an ice water generator and sucks cold water from the ice heat storage tank and circulates it as ice water to the ice heat storage tank, and the ice water generator supercools the evaporator of the refrigerator that supercools the cold water. An ice heat storage device comprising: a supercooling release unit that releases ice water to release ice water and sends the ice water to the ice heat storage tank.   The supercooling release unit includes a flow velocity accelerating portion that is connected to the evaporator of the ice water generator, and an outlet water chamber that is connected to the flow velocity accelerating portion so that the direction of the axial center differs from that of the flow velocity accelerating portion. And the supercooled water flowing out from the evaporator is accelerated by the flow velocity accelerating unit, and the supercooled state is released by changing the flow direction in the outlet water chamber. The ice heat storage device according to claim 3 configured.   The ice heat storage device according to claim 4, wherein the flow velocity accelerating unit is provided to be offset with respect to a center of the outlet water chamber, and a swirling flow is generated in the outlet water chamber.   The ice heat storage device according to claim 4, wherein a heating means is provided at least in a downstream end portion of the flow velocity accelerating portion, and a heat insulating portion is formed in a continuous portion between the flow velocity accelerating portion and the outlet water chamber portion.

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