JP2017215062A - Indirect heat exchange cold water circulation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indirect heat exchange cold water circulation system capable of utilizing a heat source from natural energy or waste heat in heat source utilization spaces such as a plurality of storage chambers with different temperatures, and preventing air in each heat source utilization space from being mixed.SOLUTION: An indirect heat exchange cold water circulation system includes: a heat source space 1 as a closed space or opened space, where a cold source 2 is arranged; heat utilization spaces 3A, 3B as a closed space, heat exchangers 5a, 5b, 5c installed in the heat source space 1 and including a circulation water flow passage; cold discharge devices 7A, 7B installed in the heat utilization spaces 3A, 3B and including a circulation water flow passage; and circulation pipes 6a, 6b and a circulation pump 8 connected to each other to circulate cold water between each of the heat utilization spaces 3A, 3B and the heat exchangers 5a, 5b, 5c. The indirect heat exchange cold water circulation system can set each temperature of the heat utilization spaces 3A, 3B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an indirect heat exchange chilled water circulation system that performs heat exchange by a heat exchange device using exhaust heat or natural energy.

  Space temperature management is indispensable for storing and preserving things and improving the living environment. In general, energy such as electricity, gas, and oil is used for temperature management. However, all of them are unfavorable because they place a burden on the environment and increase costs. Particularly in recent years, there has been a demand for a temperature management method with a low environmental load in response to a request to reduce carbon dioxide emissions. In the fields of electricity, gas, and oil, development of environmental countermeasure products using exhaust heat is progressing.

  In Hokkaido and highlands, the days when the maximum temperature is below freezing continues in winter, a lot of snow falls, and the water freezes naturally. In order to melt such snow and ice, a certain heat of fusion is required, and since the heat is taken away from the surrounding air, the temperature of the air is lowered. If this heat of fusion is used, the environmental load is hardly applied and the temperature of the space can be controlled at a low cost.

  The conventional method of using snow and ice is the simplest natural convection method in which stored items are placed in an ice chamber carrying a large amount of snow and ice, and has been used for a long time.

As a method of using snow or ice, a direct heat exchange cold air system shown in FIG. 4 is also known.
4A and 4B are a schematic plan view and a front schematic view schematically showing a configuration example of a storage system using a direct heat exchange cold air system. FIG. 4C is a schematic plan view schematically illustrating another configuration example of the storage system based on the direct heat exchange cold air system. The arrows in the figure indicate the direction of air flow.

  In the configuration example shown in FIGS. 4A, 4B, and 4C, an ice tank 130 in which water is sealed in a tank and frozen with cold air in winter is used as a cold heat source. As shown in FIGS. 4 (a) and 4 (b), the ice chamber 100 in which the ice tank 130 is installed and the storage chamber 110 in which stored items 140 to be kept cool are separated, and the ice chamber 100 is separated from the ice chamber 100 using duct fans 120a and 120b. By circulating air between the storage chamber 110, the space in the storage chamber can be cooled. The air in the storage chamber 110 enters the ice chamber 100 by the suction duct fan 120 a and is cooled in the ice chamber 100. Since the cooled air is sent from the ice chamber 100 to the storage chamber 110 by the delivery duct fan 120b, the storage chamber 110 can be cooled.

  The configuration example shown in FIG. 4C includes two storage chambers 110 for one ice chamber 100 in which the ice tank 130 is installed. In this manner, unlike the natural convection method, by installing the suction duct fan 120a and the delivery duct fan 120b on the wall between the ice chamber 100 and each storage chamber 110, the ice chamber 100 can be changed to two or more storage chambers 110. Can send air. When the storage temperature of each storage room is different, temperature control is performed using an electric heater or the like.

  In this direct heat exchange cold air system, the air in the storage chamber 110 is directly brought into contact with the air in the ice chamber 100 for heat exchange, and hence is referred to as “direct”.

  The mobile ice chamber proposed in Patent Document 1 and its method of use are based on the direct heat exchange cold air method, and natural ice frozen in cold regions in winter is used for cooling and refrigeration in summer other than cold regions. It is a mobile ice chamber that can be used easily.

  In the field of heating, in cold regions, there has been a hot water heating system (so-called central heating) that circulates hot water heated by a heat source in the house and radiates heat from terminals such as panel radiators and floor heating. Well used. The invention shown in Patent Document 2 is an example of such a hot water heating system.

JP2009-127894A JP-A-6-323557

  In the natural convection method, snow and ice can be used only for the purpose of storage, and since the ice chamber and the storage space are the same space, only one storage space is used for one ice chamber. Was not efficient.

  In the direct heat exchange cold air system, a plurality of storage spaces can be used in one ice chamber, or can be used for a plurality of purposes such as cooling in addition to storage. However, when changing the temperature of multiple storage rooms, the temperature is controlled by using an electric heater in each storage room, so it is not only difficult to adjust the temperature but also refrigerated using natural energy. There was a problem that things would be heated by electric energy.

  In addition, since the air sent out from the ice chamber is circulated in each storage chamber and the air in each storage chamber is released into the ice chamber, the air in the ice chamber and each storage chamber is mixed in the ice chamber. For example, depending on the type of stored products such as fresh foods and fermented foods, there is a problem that it is not preferable for hygiene management or quality control.

  An object of the present invention is to provide an indirect heat exchange chilled water circulation system in which one heat source based on natural energy can be used for a heat source use space such as a plurality of storage rooms having different temperatures, and air in each heat source use space is not mixed. It is.

  In order to solve the above-described problems, the present invention has the following configuration. The numbers in parentheses are reference numerals in the drawings to be described later, and are attached for reference.

  An aspect of the present invention is an indirect heat exchange cold water circulation system, in which a heat source space (1) that is a closed space or an open space in which a cold heat source (2) is disposed, and a plurality of heat uses that are closed spaces A space (3A, 3B), a heat exchange device (5a, 5b, 5c) installed in the heat source space (1) and having a circulating water flow path (5a1), and the plurality of heat utilization spaces (3A, 3B) ) And a heat release device (7A, 7B) having a circulating water flow path (7B1), each of the plurality of heat utilization spaces (3A, 3B), and the heat exchange device (5a, 5b, 5c) A circulation pipe (6a, 6b) and a circulation pump (8) respectively connected to circulate cold water between them and the circulation pump.

  In the above aspect, the temperature of each of the plurality of heat utilization spaces (3A, 3B) can be further set by the heat exchange performance of the heat exchange devices (5a, 5b, 5c).

  In the above aspect, the heat source space (1) is a closed indoor space, and the cold heat source (2) is ice or snow.

  In the above aspect, the heat source space (1) is an open outdoor space, and the cold heat source (2) is snow.

  In the above aspect, the heat utilization space (3A, 3B) is a storage room for agricultural and marine products or processed products thereof.

  In the above aspect, the cold heat release device (7A, 7B) is an existing hot water heating terminal.

  According to the indirect heat exchange air circulation system of the present invention, one cold heat source using natural energy can be used in a plurality of heat utilization spaces such as a storage room and a residential space. In that case, it can set and use at different temperature in each heat utilization space.

  Moreover, since the air of each heat utilization space and the air of a heat source space and a heat utilization space do not mix, it is suitable on sanitary management or quality control.

  Furthermore, by using the existing hot water heating terminal as a cold heat release device, the hot water heating terminal used for heating in winter can be used for cooling.

FIG. 1A and FIG. 1B are a schematic plan view and a front schematic view schematically showing a configuration example of an indirect heat exchange cold water circulation system according to the present invention. However, in FIG. 1A, the roof portion and the ice tank are omitted, and in FIG. 1B, the front side wall portion and the storage are omitted. 2A and 2B are a schematic plan view and a schematic front view of the heat exchange device of the configuration example shown in FIG. FIGS. 3A and 3B are a schematic side view and a schematic front view of the cold heat release apparatus of the configuration example shown in FIG. 1. 4A and 4B are a schematic plan view and a front schematic view schematically showing a configuration example of a storage system using a direct heat exchange cold air system. FIG. 4C is a schematic plan view schematically illustrating another configuration example of the storage system based on the direct heat exchange cold air system.

  Hereinafter, an indirect heat exchange cold water circulation system according to the present invention will be described in detail with reference to the drawings. Further, the indirect heat exchange cold water circulation system according to the present invention does not exchange heat by directly contacting the air in the heat utilization space with the air in the heat source space, but through the heat exchange device, the cold heat release device, and the circulating water. This is called “indirect” because heat is exchanged by contact. In the present invention, “heat source” means a cold heat source, and “heat utilization space” means a cold heat utilization space. In addition, “water” of “cold water” or “circulated water” does not mean pure water only, but also includes antifreeze or a mixture of antifreeze and pure water.

  FIG. 1A and FIG. 1B are a schematic plan view and a front schematic view schematically showing a configuration example of an indirect heat exchange cold water circulation system according to the present invention. However, in FIG. 1A, the roof portion and the ice tank are omitted, and in FIG. 1B, the front side wall portion and the storage are omitted. The arrows in the figure indicate the direction of circulating water.

  The indirect heat exchange air circulation system of the configuration example shown in FIGS. 1A and 1B includes one heat source space 1 that is a closed space and a plurality of heat utilization spaces 3A and 3B. The heat utilization spaces 3A and 3B are two as an example, but can be any number of three or more. Since the heat source space 1 is an ice storage chamber as an example, the heat source space 1 will be described as “ice storage chamber 1”. Since the heat utilization spaces 3A and 3B are storage rooms as an example, they will be described as “storage rooms 3A and 3B” below. The ice storage chamber 1 includes a cold heat source 2 and heat exchange devices 5a, 5b, and 5c. Since the cold heat source 2 is generated using natural energy and is an ice tank as an example, it will be described as “ice tank 2” below. The storage chambers 3A and 3B are provided with cold heat release devices 7A and 7B, respectively.

  The ice tank 2 is obtained by freezing water enclosed in tanks stacked in a plurality of shelves installed in the ice storage room 1 by using cold in winter. When the ice in the ice tank 2 melts, the air in the ice storage chamber 1 can be cooled by removing heat from the surrounding air.

  The heat exchange devices 5a, 5b and 5c provided in the ice storage chamber 1 and the cold heat release device 7A provided in the storage chamber 3A are connected by circulation pipes 6a and 6b. The circulation pipes 6a and 6b branch at intermediate positions between the heat exchange devices 5a, 5b, and 5c and the storage chamber 3A, and are also connected to a cold heat release device 7B provided in the storage chamber 3B. The heat exchange devices 5a and 5b and the heat exchange devices 5b and 5c are connected by connecting pipes 9a and 9b, respectively. By the action of the pump 8, the circulating water circulates in the heat exchange devices 5a, 5b, 5c, the circulation pipes 6a, 6b, the cold heat release devices 7A, 7B, and the connection pipes 9a, 9b. The circulating water that has passed through the heat exchange devices 5a, 5b, and 5c enters the circulation pipe 6a, branches in the middle, and is sent to the cold heat release devices 7A and 7B, respectively. The circulating water passes through the cold heat release devices 7A and 7B, and then is sent to the circulation pipe 6b. The circulating water that has passed through the cold heat release device 7A and the circulating water that has passed through the cold heat release device 7B merge. Thereafter, the heat is again sent to the heat exchange devices 5a, 5b, and 5c.

  Since the circulating water sent to the circulation pipe 6b is cooled when passing through the heat exchange devices 5a, 5b, and 5c, the circulating water cooled from the circulation pipe 6a is sent to the cold heat release devices 7A and 7B, respectively. . The air in the storage chambers 3A and 3B is cooled by the heat exchange capability of the cold heat release devices 7A and 7B, and the stored items 4A and 4B can be kept cold. A specific configuration of the heat exchange devices 5a, 5b, and 5c will be described later with reference to FIG. The specific configuration of the cold heat release devices 7A and 7B will be described later with reference to FIG.

  The circulating water does not exchange heat by directly contacting the air in the ice storage chamber 1 and the storage chambers 3A and 3B, but passes through the heat exchange devices 5a, 5b, and 5c, so that the heat exchange devices 5a, 5b, and 5c. Heat exchange with the air in the ice storage chamber 1 in a non-contact manner through the surface member of the ice storage chamber, and further through the cold heat release devices 7A and 7B, thereby making a non-contact through the surface member of the cold heat release devices 7A and 7B. The heat exchange is performed between the air in the storage chambers 3A and 3B. Therefore, the air in the storage chamber 3A and the air in the storage chamber 3B are not mixed. Further, the air in each of the storage chambers 3A and 3B and the air in the ice storage chamber 1 are not mixed. Thus, in this system, the stored items 4A and 4B stored in the storage chambers 3A and 3B do not affect each other in terms of hygiene and quality, and are not affected by the air in the ice storage chamber 1. This is suitable for the case where the stored products 4A and 4B are agricultural and marine products such as meat, seafood, sake and cheese, and processed products thereof. In particular, it is more suitable for fermented foods that use bacteria in the air or are affected by bacteria in the air.

  2A and 2B are a schematic plan view and a schematic front view of the heat exchange device of the configuration example shown in FIG. The heat exchange device shown in FIG. 2 is the heat exchange device 5a shown in FIG. 1, but the heat exchange devices 5b and 5c have the same configuration as the heat exchange device 5a.

  As shown in FIGS. 2 (a) and 2 (b), the heat exchange device 5a is a thin, substantially rectangular heat exchange panel, and the heat exchange device 5a has several times in the width direction of the heat exchange device 5a. A meandering circulating water flow path 5a1 is also formed.

  The circulating water sent out from the storage chambers 3A and 3B to the circulation pipe 6b first flows into the heat exchange device 5a from the heat exchange device inlet 5a2 provided at the end of the heat exchange device 5a, and passes through the panel in the width direction. To the heat exchanger outlet 5a3 through the circulating water flow path 5a1 meandering many times. Thereafter, the heat exchange device 5b is reached via the connecting pipe 9a connecting the heat exchange device 5a and the heat exchange device 5b, and similarly passes through the heat exchange device 5b. After that, the heat exchange device 5c is reached via the connecting pipe 9b connecting the heat exchange device 5b and the heat exchange device 5c, and similarly passes through the heat exchange device 5c.

  By passing through the circulating water flow path 5a1 meandering in the width direction many times in the heat exchange device 5a, heat exchange between the circulating water and the cold air in the ice storage chamber 1 is efficiently performed, and the circulating water can be cooled. it can. The same applies to the heat exchange devices 5b and 5c.

  The shape, size, quantity, arrangement, and direction of the circulating water flow path of the heat exchange devices 5a, 5b, and 5c are not particularly limited, but in order for heat exchange to be performed efficiently, the heat exchange devices 5a, 5b, and 5c The ice tank 2 is preferably surrounded. Note that it is not preferable to bring the lower end surfaces of the heat exchange devices 5a, 5b, and 5c into contact with the floor because the surface area for heat exchange decreases. Therefore, for example, it is preferable to provide a space between the floor by providing legs (not shown) at both ends of the lower end surfaces of the heat exchange devices 5a, 5b, and 5c so as not to contact the floor. It is.

  In the illustrated example, the overall shape of each of the three heat exchange devices 5a, 5b, 5c is a substantially rectangular panel. As an example, each of the heat exchange devices 5 a, 5 b, and 5 c has a thin shape having the same area as the shelf of the ice tank 2, and is arranged at the lower stage of the shelf of the ice tank 2. In this example, it is not necessary to secure a place separately from the shelf in order to arrange the heat exchange devices 5a, 5b, and 5c, and the heat exchange devices 5a, 5b, and 5c are arranged directly below the ice tank 2, Heat exchange can be performed efficiently.

  FIGS. 3A and 3B are a schematic side view and a schematic front view of the cold heat release apparatus of the configuration example shown in FIG. 1. The cold heat release device shown in FIG. 3 is the cold heat release device 7B shown in FIG. 1, but the cold heat release device 7A has the same configuration as the cold heat release device 7B.

  As shown in FIGS. 3 (a) and 3 (b), the cold heat release device 7B is a thin, substantially rectangular heat exchange panel, and the cold heat release device 7B has several times in the width direction of the cold heat release device 7B. A meandering circulating water flow path 7B1 is also formed.

  The circulating water sent from the heat exchange device 5c to the circulation pipe 6a first flows into the cold heat release device 7B from the cold heat discharge device inlet 7B2 provided at the end of the cold heat release device 7B, and passes through the cold heat discharge device 7B. It passes through the circulating water flow path 7B1 meandering many times in the width direction and reaches the cold heat discharge device outlet 7B3.

  By passing the circulating water flow path 7B1 meandering in the width direction many times in the cold heat release device 7B, heat exchange between the cold circulating water and the air in the storage chamber 3B is efficiently performed, and the air in the storage chamber 3B is exchanged. Can be cooled.

  In the illustrated example, the overall shape of each of the cold heat release devices 7A and 7B is a thin, substantially panel shape, and is disposed one by one in each of the storage chambers 3A and 4B, but the shape of the cold heat release devices 7A and 7B, The size, quantity, arrangement, direction of the circulating water flow path, etc. are not particularly limited.

  The materials of the heat exchange devices 5a, 5b and 5c, the circulation pipes 6a and 6b, the cold heat release devices 7A and 7B, and the connection pipes 9a and 9b are not particularly limited. The heat exchange devices 5a, 5b and 5c, the cold heat release devices 7A and 7B, and the connection pipes 9a and 9b are preferably made of a material having good heat conductivity such as an aluminum plate or an aluminum tube. Further, when the storage rooms 3A and 3B are installed in a place away from the ice storage room 1, the circulation pipes 6a and 6b are made of a material having low heat conduction or covered with a material having high heat insulation properties. The loss of cold heat between the chamber 1 and the storage chambers 3A and 3B is reduced, which is preferable.

  In order to prevent the circulating water from freezing and bursting inside the heat exchange device, pipe, etc., it is preferable to use an antifreeze solution. For example, a mixture with water containing ethylene glycol or propylene glycol as a main component is used, but not limited thereto. Further, it is more preferable to add a rust inhibitor.

  The temperature of one storage chamber 3B can be set by appropriately setting the amount of liquid delivered by the pump 8 and / or the heat exchange performance of the heat exchange devices 5a, 5b, 5c and the cold heat release device 7B as necessary. By changing the liquid feed amount of the pump 8, the residence time of the circulating water in the heat exchange devices 5a, 5b, 5c and the cold heat release device 7B can be changed. If the residence time is long, the heat exchange amount becomes large, and if the residence time is short, the heat exchange amount becomes small. The change in the amount of liquid delivered by the pump 8 is preferable because it can be performed quickly and easily. The heat exchange performance of the heat exchange devices 5a, 5b, 5c and the cold heat release device 7B can be changed by changing the surface area for heat exchange and the residence time of the circulating water. For example, the outer dimensions and the number of panels of the heat exchange panels 5a, 5b, 5c and the cold heat release device 7B, the lengths of the circulating water flow paths 5a1, 7B1 (the number of meanders), and the like are changed. The temperature of the other storage chamber 3A can be set separately by the same method.

  For example, when it is desired to set the temperature of the storage chamber 3B to 0 to 1 ° C., which is the temperature of the ice storage chamber 1, the liquid feed amount of the pump 8 is minimized to increase the residence time in the heat exchange devices 5a, 5b, and 5c. Further, the outer dimensions of the heat exchange devices 5a, 5b, and 5c may be increased, the number of sheets may be increased, and / or the number of meanders of the circulating water flow path 5a1 may be increased. Also, the heat exchange efficiency in the storage chamber 3B may be increased by increasing the outer dimensions of the cold heat release device 7B, increasing the number of sheets, and / or increasing the number of meanders of the circulating water flow path 7B1.

  Moreover, temperature can also be adjusted by changing the quantity of the circulating water which flows into cold-heat discharge | release apparatus 7A, 7B. For example, when it is desired to raise the temperature of the storage chamber B slightly, the cold heat discharge device inlet 7B2 is narrowed, and the amount of circulating water flowing into the cold heat discharge device 7B is reduced, thereby reducing the cold heat released into the storage chamber B, The temperature can be adjusted. Although not shown in the drawings, it is preferable that the size of the opening of the cold heat release device inlet 7B2 can be adjusted by a valve or the like.

  Thus, the temperature of each storage chamber can be set to a desired temperature by changing the amount of liquid fed by the pump and the heat exchange performance of the heat exchange device and the cold heat release device. That is, a plurality of storage rooms can be managed at different temperatures using one ice storage room 1. Therefore, an electric heater or the like is not required to change the temperature of each storage room as in the prior art.

  The heat utilization space is not limited to the storage room. As another embodiment, the residential space may be a heat utilization space. Thereby, the use as a cooling is also possible. A circulation pipe that circulates the heat exchange device provided in the ice storage room and the cold heat release device provided in the living space is installed, and the circulating water is circulated by the action of the pump. The heat exchange device exchanges heat between the air in the ice storage room and the circulating water, the circulating water is cooled, and the cold heat release device exchanges heat between the air in the living space and the circulating water, and the living space is cooled. The

  As yet another embodiment, a hot water heating terminal already installed in a residential space or the like may be used as the cold heat release device. In cold regions, panel radiators and the like are often installed in each room of the living space as a terminal for hot water heating (central heating). By using an existing panel radiator or the like as a cold heat release device, a hot water heating terminal such as a panel radiator that has been used as a heating facility in winter can be used as a cooling facility in summer.

    In the illustrated example, the ice storage room, which is a closed space, is used as a heat source space, and an ice tank is installed as a cold heat source. However, snowfall can be used as a cold heat source in winter in a snowy area. For example, a heat source space in which snow is carried into an indoor space, which is a closed space, or a heat source space in which the ceiling of a snow storage facility with a ceiling is temporarily opened to accumulate snow and then the ceiling is closed to store the snow.

  As another example, an outdoor snow accumulation place or snow storage place that is an open space may be used as a heat source space, and a heat exchange device may be installed. A heat exchange device installed outdoors and an indoor heat utilization space, which is a closed space, are connected by a circulation pipe. Heat exchange occurs between the outdoor air and the circulating water by the heat exchange device, and the circulating water in the circulation pipe is cooled and transported to the heat utilization space. With the cold energy release device installed in the heat utilization space, heat exchange occurs between the air in the cold utilization space and the circulating water, and the heat utilization space is cooled. Because it is possible to directly use natural snowfall as a source of cold heat, it is more environmentally friendly.

  The embodiment of the present invention described above is merely an example, and various modifications other than those described above to which various known techniques are applied are also included in the present invention.

10: Indirect heat exchange cold water circulation system 1: Heat source space (ice storage room)
2: Cold heat source (ice tank)
3A, 3B: Heat utilization space (storage room)
4A, 4B: Stored products 5a, 5b, 5c: Heat exchanger 5a1: Circulating water channel 5a2: Heat exchanger inlet 5a3: Heat exchanger outlet 6a, 6b: Circulation pipe 7A, 7B: Cold heat release device 7B1: Circulating water channel 7B2: Cold heat discharge device inlet 7B3: Cold heat discharge device outlet 8: Pumps 9a, 9b: Connection pipe 100 Ice chamber 110 Storage chamber 120a Suction duct fan 120b Delivery duct fan 130 Ice tank 140 Stored item

Claims (6)

One heat source space (1) which is a closed space or an open space in which the cold heat source (2) is arranged;
Multiple heat-use spaces (3A, 3B) that are closed spaces;
A heat exchange device (5a, 5b, 5c) installed in the heat source space (1) and provided with a circulating water flow path (5a1);
A cold heat release device (7A, 7B) disposed in the plurality of heat utilization spaces (3A, 3B) and provided with a circulating water flow path (7B1);
A circulation pipe (6a, 6b) and a circulation pump respectively connected to circulate cold water between each of the plurality of heat utilization spaces (3A, 3B) and the heat exchange device (5a, 5b, 5c) (8)
Indirect heat exchange cold water circulation system.   The indirect heat exchange chilled water circulation system according to claim 1, wherein the temperature of each of the plurality of heat utilization spaces (3A, 3B) can be further set by the heat exchange performance of the heat exchange device.   The indirect heat exchange cold water circulation system according to claim 1 or 2, wherein the heat source space (1) is a closed indoor space, and the cold heat source (2) is ice or snow.   The indirect heat exchange cold water circulation system according to claim 1 or 2, wherein the heat source space (1) is an open outdoor space, and the cold heat source (2) is snow.   The indirect heat exchange cold water circulation system according to any one of claims 1 to 4, wherein the heat utilization space (3A, 3B) is a storage room for agricultural or marine products or processed products thereof.   The indirect heat exchange cold water circulation system according to any one of claims 1 to 4, wherein the cold heat release device (7A, 7B) is an existing hot water heating terminal.

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