EP3306221A2 - Water heating system - Google Patents
Water heating system Download PDFInfo
- Publication number
- EP3306221A2 EP3306221A2 EP17194192.5A EP17194192A EP3306221A2 EP 3306221 A2 EP3306221 A2 EP 3306221A2 EP 17194192 A EP17194192 A EP 17194192A EP 3306221 A2 EP3306221 A2 EP 3306221A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- heat exchange
- exchange unit
- heat exchanger
- flow channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
- F24H4/04—Storage heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0015—Guiding means in water channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/0092—Devices for preventing or removing corrosion, slime or scale
Definitions
- the present invention relates to a water heating system.
- a heat pump-type water heating system in which water is configured to turn into hot water due to heat exchange between a refrigerant and the water, for example, a heat pump-type water heating system is known.
- the heat pump-type water heating system is configured to include a refrigerant unit that includes a refrigerant circulation line in which a refrigerant circulates, and a compressor, a vaporizer, and a heat exchanger which are provided in the refrigerant circulation line; and a hot water storage unit that includes a water flow channel which is connected to the heat exchanger and in which water or hot water flows, a pump which is provided in the water flow channel, a hot water storage tank which is connected to the water flow channel, and a water supply line which is configured to supply water from outside to a lower portion of the hot water storage tank.
- water flowing in the water flow channel for example, tap water, underground water, or the like is employed.
- water such as tap water, underground water, and the like, contains hardness components such as calcium and magnesium, and there are cases of a remarkably significant amount of the hardness components being contained, depending on the geographical zone.
- the water heating system is no longer able to perform a water heating operation.
- Patent Document 1 discloses a heat-pump water heater in which a heat exchanger can be divided into a high-temperature part (a part where the temperature of hot water is high) and a low-temperature part (a part where the temperature of water is not so high), and the high-temperature part is configured to be attachable and detachable.
- Patent Document 1 Japanese Unexamined Patent Application, First Publication No. 2004-144445
- Patent Document 1 The technology disclosed in the aforementioned Patent Document 1 is a technology for improving the efficiency of maintenance of the heat exchanger after scale adheres to or grows in the water flow channel on a high-temperature side in the heat exchanger.
- Patent Document 1 when employing the technology disclosed in Patent Document 1, there is a need to regularly perform processing of replacing the high-temperature part or cleaning the water flow channel to which scale adheres in the high-temperature part, at the stage in which a certain amount of scale has adhered thereto, thereby leading to a problem in that the frequency of maintenance of the heat exchanger increases.
- the present invention aims to provide a water heating system capable of reducing the frequency of maintenance of a heat exchanger required because of scale.
- a water heating system including a refrigerant unit that includes a refrigerant circulation line in which a refrigerant circulates, a vaporizer which is provided in the refrigerant circulation line, is configured to vaporize the liquid refrigerant decompressed by an expansion valve, and is configured to generate refrigerant gas, a compressor which is provided in the refrigerant circulation line, and is configured to compress the refrigerant gas guided out from the vaporizer, and a heat exchanger which is provided in the refrigerant circulation line, is configured to perform heat exchange between the refrigerant gas guided out from the compressor and water, and is configured to turn the water into hot water; and a hot water storage unit that includes a hot water storage tank which stores the hot water, a water guide-in line which is configured to guide the water stored in a lower portion inside the hot water storage tank into the heat exchanger through one end of the heat exchanger, a hot water guide-in line which
- the heat exchanger has a plurality of heat exchange units which are separated from each other in a predetermined direction and are connected to each other in series.
- the plurality of heat exchange units each include at least one water flow channel in which the water flows.
- the plurality of heat exchange units include at least a first heat exchange unit configuring the other end of the heat exchanger, and a second heat exchange unit being disposed in the vicinity of the first heat exchange unit in a direction in which the water flows.
- a total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows is smaller than a total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- the flow rate of hot water (water) flowing in the water flow channel of the first heat exchange unit in which the temperature of hot water is high such that scale is likely to be generated becomes higher than the flow rate of water (low-temperature hot water) flowing in the water flow channel of the second heat exchange unit. Therefore, it is possible to inhibit scale from being deposited in the water flow channel of the first heat exchange unit.
- the water flow channel of the first heat exchange unit can be retained in an environment in which scale is unlikely to grow.
- it is possible to reduce the frequency of maintenance of the heat exchanger required because of scale.
- the diameter of the water flow channel of the first heat exchange unit may be smaller than the diameter of the water flow channel of the second heat exchange unit.
- the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows can be smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- the flow rate of hot water flowing in the water flow channel of the first heat exchange unit becomes higher than the flow rate of water flowing in the water flow channel of the second heat exchange unit.
- it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- the number of water flow channels of the first heat exchange unit may be less than the number of water flow channels of the second heat exchange unit.
- the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows can be smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- the flow rate of hot water flowing in the water flow channel of the first heat exchange unit becomes higher than the flow rate of water flowing in the water flow channel of the second heat exchange unit.
- it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- the heat exchanger may be divided into two units and may be configured to include the first heat exchange unit and the second heat exchange unit.
- the flow rate of the water flowing in the water flow channel of the first heat exchange unit may range from 1.5 times to 3.0 times a flow rate of the water flowing in the water flow channel of the second heat exchange unit.
- the heat exchanger is configured to include the first heat exchange unit disposed on a high-temperature side (side on which the temperature of hot water (water) is higher than that in the second heat exchange unit) and the second heat exchange unit, when the flow rate of water flowing in the water flow channel of the first heat exchange unit is lower than 1.5 times the flow rate of water flowing in the water flow channel of the second heat exchange unit, there is concern that an effect of washing away the scale will deteriorate.
- a length of the first heat exchange unit in the predetermined direction may be equal to or shorter than 0.5 times a length of the heat exchanger that is the sum total of a length of the second heat exchange unit in the predetermined direction and the length of the first heat exchange unit.
- the length of the first heat exchange unit is equal to or shorter than 0.5 times the length of the second heat exchange unit, the pressure loss in the first heat exchange unit is reduced, and it is possible to sufficiently inhibit scale from growing in the water flow channel of the first heat exchange unit.
- a water heating system including a refrigerant unit that includes a refrigerant circulation line in which a refrigerant circulates, a vaporizer which is provided in the refrigerant circulation line, is configured to vaporize the liquid refrigerant decompressed by an expansion valve, and is configured to generate refrigerant gas, a compressor which is provided in the refrigerant circulation line, and is configured to compress the refrigerant gas guided out from the vaporizer, and a first heat exchanger which is provided in the refrigerant circulation line, is configured to perform heat exchange between the refrigerant gas guided out from the compressor and first water, and is configured to turn the first water into first hot water; a water circulation unit that includes a water circulation line which is configured to be a closed loop such that the first water circulates, and is configured to cause the first water to circulate in the first heat exchanger, and a second heat exchanger which is provided in the water circulation line, is configured to perform heat exchange between the first hot
- the second heat exchanger has a plurality of heat exchange units which are separated from each other in a predetermined direction and are connected to each other in series.
- the plurality of heat exchange units each include at least one water flow channel in which the second water flows.
- the plurality of heat exchange units include at least a first heat exchange unit configuring the other end of the second heat exchanger, and a second heat exchange unit being disposed in the vicinity of the first heat exchange unit in a direction in which the second water flows.
- the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows is smaller than a total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows.
- the flow rate of the second hot water (the second water) flowing in the water flow channel of the first heat exchange unit in which the temperature of the second hot water is high such that scale is likely to be generated can be higher than the flow rate of the second water flowing in the water flow channel of the second heat exchange unit.
- the diameter of the water flow channel of the first heat exchange unit may be smaller than the diameter of the water flow channel of the second heat exchange unit.
- the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows becomes smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows.
- the second water (the second hot water) flowing in the water flow channel of the second heat exchange unit is unlikely to flow in the water flow channel of the first heat exchange unit.
- the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit can be higher than the flow rate of the second water flowing in the water flow channel of the second heat exchange unit.
- it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit, due to the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit.
- the number of water flow channels of the first heat exchange unit may be less than the number of water flow channels of the second heat exchange unit.
- the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows becomes smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows.
- the second water (the second hot water) flowing in the water flow channel of the second heat exchange unit is unlikely to flow in the water flow channel of the first heat exchange unit.
- the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit can be higher than the flow rate of the second water flowing in the water flow channel of the second heat exchange unit.
- it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit, due to the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit.
- FIG. 1 is a system diagram showing a schematic configuration of a water heating system according to a first embodiment of the present invention.
- a heat pump-type water heating system is shown.
- A indicates a direction (hereinafter, will be referred to as "A-direction") in which a refrigerant moves inside a heat exchanger 23
- B indicates a direction (hereinafter, will be referred to as “B-direction") in which water moves inside the heat exchanger 23
- X indicates a predetermined direction (hereinafter, will be referred to as "X-direction”) in which first and second heat exchange units 31, 32 are disposed.
- a water heating system 10 of the first embodiment has a refrigerant unit 11 and a hot water storage unit 12.
- the refrigerant unit 11 has a refrigerant circulation line 15, an expansion valve 17, a vaporizer 18, a compressor 21, the heat exchanger 23, and valves 25, 26.
- the refrigerant circulation line 15 is a line for causing the refrigerant (for example, CO 2 ) to circulate.
- the expansion valve 17 is provided in the refrigerant circulation line 15.
- the expansion valve 17 is disposed on the downstream side of the heat exchanger 23 when seen based on a flowing direction of the refrigerant.
- a low-temperature/high-pressure liquid refrigerant guided out from the heat exchanger 23 is supplied to the expansion valve 17.
- the expansion valve 17 the low-temperature/high-pressure liquid refrigerant is decompressed, and a low-temperature/low-pressure liquid refrigerant is generated.
- the vaporizer 18 is provided in the refrigerant circulation line 15.
- the vaporizer 18 is disposed on the downstream side of the expansion valve 17 when seen based on the flowing direction of the refrigerant.
- the low-temperature/low-pressure liquid refrigerant which has passed through the expansion valve 17 is vaporized, and a low-temperature/low-pressure gas refrigerant is generated.
- the compressor 21 is provided in the refrigerant circulation line 15.
- the compressor 21 is disposed between the vaporizer 18 and the other end 23B of the heat exchanger 23.
- the compressor 21 is configured to cause the low-temperature/low-pressure gas refrigerant guided out from the vaporizer 18 to be compressed and to rise in temperature, thereby generating a high-temperature/high-pressure gas refrigerant.
- the high-temperature/high-pressure gas refrigerant is guided into the heat exchanger 23 from the other end 23B side of the heat exchanger 23.
- the heat exchanger 23 has a heat exchanger main body 30 including the first and second heat exchange units 31, 32; a first connection supply line 35; valves 36, 37, 42, 43; and a second connection supply line 41.
- the heat exchanger main body 30 is divided into the first heat exchange unit 31 and the second heat exchange unit 32 in the X-direction (the predetermined direction).
- the first heat exchange unit 31 configures the other end 23B of the heat exchanger 23.
- FIG. 2 is a cross-sectional view cut along line C 1 -C 2 in the first heat exchange unit configuring the heat exchanger shown in FIG. 1 .
- FIG. 2 shows a cross section of a tube-type heat exchanger as an example of the first heat exchange unit 31.
- the same reference signs are applied to configuration parts the same as in the structure shown in FIG. 1 .
- the first heat exchange unit 31 configures the other end 23B and has a tube 45 and plates 46.
- One end of the tube 45 is connected to the second connection supply line 41, and the other end (an end disposed on the other end 23B side) thereof is connected to one end of a hot water guide-out line 68 (will be described below).
- the tube 45 defines a water flow channel 47.
- a diameter R 1 (in this case, the bore diameter, corresponding to the inner diameter of the tube 45) of the water flow channel 47 is uniform in size in the X-direction.
- a plurality of plates 46 are disposed at predetermined intervals so as to be orthogonal to an extending direction of the tube 45.
- the plurality of plates 46 support the tube 45 and define spaces for accommodating the refrigerant (specifically, the high-temperature/high-pressure gas refrigerant guided out from the compressor 21).
- the first heat exchange unit 31 having the above-described configuration, low-temperature hot water (water) guided out from the second heat exchange unit 32 and a high-temperature/high-pressure gas refrigerant guided out from the compressor 21 are subjected to heat exchange, so that the temperature of the hot water becomes high (for example, a temperature equal to or higher than 60°C).
- the high-temperature hot water is guided into an upper portion of a hot water storage tank 56 via a hot water guide-in line 66.
- FIG. 3 is a cross-sectional view cut along line D 1 -D 2 in the second heat exchange unit configuring the heat exchanger shown in FIG. 1 .
- FIG. 3 shows a cross section of the tube-type heat exchanger as an example of the second heat exchange unit 32.
- the same reference signs are applied to configuration parts the same as in the structure shown in FIG. 1 .
- the second heat exchange unit 32 configures the one end 23A and has a tube 51 and plates 52.
- One end (an end disposed on the one end 23A side) of the tube 51 is connected to a water guide-in line 61, and the other end thereof is connected to the second connection supply line 41.
- the tube 51 defines a water flow channel 53.
- a diameter R 2 (in this case, the bore diameter, corresponding to the inner diameter of the tube 51) of the water flow channel 53 is uniform in size in the X-direction.
- Water is supplied to the lower portion of the hot water storage tank 56 from outside of the water heating system 10 via a water supply line 58 (will be described below).
- a water supply line 58 will be described below.
- the water contains many hardness components such as calcium and magnesium. When the temperature of the water rises to 60°C or higher, the hardness components cause scale.
- a plurality of plates 52 are disposed at predetermined intervals so as to be orthogonal to an extending direction of the tube 51.
- the plurality of plates 52 support the tube 51 and define spaces for accommodating the refrigerant (specifically, the gas refrigerant supplied via the first heat exchange unit 31).
- water (for example, approximately 20°C) guided out from the hot water storage tank 56 and the gas refrigerant which has passed through the first heat exchange unit 31 are subjected to heat exchange, so that water is heated and is configured to turn into low-temperature hot water (water) (for example, a temperature ranging from 20°C to less than 60°C).
- the low-temperature hot water (water) is guided into the tube 45 shown in FIG. 2 , via the second connection supply line 41.
- the diameter R 1 of the water flow channel 47 of the first heat exchange unit 31 is configured to be smaller than the diameter R 2 of the water flow channel 53 of the second heat exchange unit 32.
- a cross-sectional area of the water flow channel 47 of the first heat exchange unit 31 cut along a plane orthogonal to the B-direction can be smaller than a cross-sectional area of the water flow channel 53 of the second heat exchange unit 32 cut along a plane orthogonal to the B-direction.
- the flow rate of hot water (water) flowing in the water flow channel 47 of the first heat exchange unit 31 in which the temperature of hot water is high such that scale is likely to be generated becomes higher than the flow rate of water (low-temperature hot water) flowing in the water flow channel 53 of the second heat exchange unit 32. Therefore, in an early stage in which scale is generated in the water flow channel 47 of the first heat exchange unit 31, it is possible to wash the scale out of the first heat exchange unit 31 by utilizing the flow rate of the hot water.
- the water flow channel 47 of the first heat exchange unit 31 can be retained in an environment in which scale is unlikely to grow. Thus, it is possible to reduce the frequency of maintenance of the heat exchanger 23 required because of scale.
- the sizes of the diameter R 1 of the water flow channel 47 and the diameter R 2 of the water flow channel 53 such that, for example, shear stress becomes equal to or greater than 30 MPa in regard to the flow rate of hot water (water) flowing in the water flow channel 47 of the first heat exchange unit 31.
- shear stress becomes equal to or greater than 30 MPa in regard to the flow rate of hot water (water) flowing in the water flow channel 47 of the first heat exchange unit 31.
- first connection supply line 35 One end of the first connection supply line 35 is connected to the first heat exchange unit 31, and the other end thereof is connected to the second heat exchange unit 32. Refrigerant gas supplied via the first heat exchange unit 31 is guided out to the first connection supply line 35. The refrigerant gas is guided into the second heat exchange unit 32 via the first connection supply line 35.
- the valve 36 is provided in the first connection supply line 35 which is disposed on the first heat exchange unit 31 side.
- the valve 37 is provided in the first connection supply line 35 which is disposed between the valve 36 and the second heat exchange unit 32.
- the valves 36, 37 are valves used when performing maintenance of the heat exchanger 23.
- the second connection supply line 41 couples the tube 45 shown in FIG. 2 and the tube 51 shown in FIG. 3 together. It is advisable that the inner diameter of the second connection supply line 41 is equal to the inner diameter of the tube 51 (in other words, the diameter of the water flow channel 53).
- the valve 42 is provided in the second connection supply line 41 which is disposed on the first heat exchange unit 31 side.
- the valve 43 is provided in the second connection supply line 41 which is disposed between the valve 42 and the second heat exchange unit 32.
- the valves 42, 43 are valves used when performing maintenance of the heat exchanger 23.
- the hot water storage unit 12 has the hot water storage tank 56, the water supply line 58, the water guide-in line 61, a pump 63, valves 64, 65, the hot water guide-in line 66, and the hot water guide-out line 68.
- the hot water storage tank 56 stores hot water in the upper portion thereof and stores water in the lower portion thereof.
- the water supply line 58 is a line for supplying water to the lower portion of the hot water storage tank 56 from outside of the water heating system 10. There are cases where the water contains many hardness components such as calcium and magnesium.
- One end of the water guide-in line 61 is connected to the lower portion inside the hot water storage tank 56, and the other end thereof is connected to one end of the tube 51.
- the water guide-in line 61 is configured to supply water stored in the lower portion inside the hot water storage tank 56 to the water flow channel 53 shown in FIG. 3 .
- the pump 63 is provided in the water guide-in line 61.
- the pump 63 feeds the water stored in the lower portion inside the hot water storage tank 56 to the water flow channel 53.
- the valve 64 is provided in the water guide-in line 61 which is disposed between the pump 63 and the second heat exchange unit 32.
- the valve 65 is provided in the water guide-in line 61 which is disposed between the hot water storage tank 56 and the second heat exchange unit 32.
- the valves 64, 65 are used when performing maintenance of the heat exchanger 23.
- One end of the hot water guide-in line 66 is connected to the other end of the tube 45 shown in FIG. 2 , and the other end thereof is connected to the upper portion of the hot water storage tank 56 (for example, the upper end).
- the hot water guide-in line 66 is configured to guide high-temperature hot water guided out from the tube 45 into the upper portion of the hot water storage tank 56.
- One end of the hot water guide-out line 68 is connected to the upper portion of the hot water storage tank 56 (for example, the upper end), and the other end thereof is connected to a usage target (not shown).
- the hot water guide-out line 68 is configured to supply hot water stored inside the hot water storage tank 56 to the usage target (not shown).
- a cross-sectional area of the water flow channel 47 of the first heat exchange unit 31 cut along a plane orthogonal to the B-direction can be smaller than a cross-sectional area of the water flow channel 53 of the second heat exchange unit 32 cut along a plane orthogonal to the B-direction.
- the flow rate of hot water (water) flowing in the water flow channel 47 of the first heat exchange unit 31 in which the temperature of hot water is high such that scale is likely to be generated becomes higher than the flow rate of water (low-temperature hot water) flowing in the water flow channel 53 of the second heat exchange unit 32. Therefore, it is possible to inhibit scale from being deposited in the water flow channel 47 of the first heat exchange unit 31.
- the water flow channel 47 of the first heat exchange unit 31 can be retained in an environment in which scale is unlikely to grow. Thus, it is possible to reduce the frequency of maintenance of the heat exchanger 23 required because of scale.
- the flow rate of water flowing in the water flow channel 47 of the first heat exchange unit 31 may range from 1.5 times to 3.0 times the flow rate of water (hot water) flowing in the water flow channel 53 of the second heat exchange unit 32.
- the total value of the pressure loss of the first and second heat exchange units is inhibited from increasing, and it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- the heat exchanger main body 30 is divided into two heat exchange units (specifically, the first and second heat exchange units 31, 32), for example, it is advisable that the length L 1 of the first heat exchange unit 31 in the X-direction is equal to or shorter than 0.5 times the length L 2 of the second heat exchange unit 32 in the X-direction.
- the length L 1 of the first heat exchange unit 31 in the X-direction is longer than 0.5 times the length L 2 of the second heat exchange unit 32 in the X-direction
- the length of the water flow channel 53 of the second heat exchange unit 32 is lengthened. Accordingly, the length of the water flow channel 47 of the first heat exchange unit 31 is lengthened, so that the pressure loss in the first heat exchange unit 31 increases. Thus, there is concern that the total pressure loss of the first and second heat exchange units 31, 32 will increase.
- the length L 1 of the first heat exchange unit 31 is equal to or shorter than 0.5 times the length L 2 of the second heat exchange unit 32, the pressure loss in the first heat exchange unit 31 is reduced, and it is possible to sufficiently inhibit scale from growing in the water flow channel 47 of the first heat exchange unit 31.
- tubes 45, 51 are provided only one each, and the water flow channels 47, 53 are provided one each.
- the same numbers of tubes 45, 51 may be provided, and the same numbers of water flow channels 47, 53 may be provided.
- the flow rate of hot water (water) flowing in the plurality of water flow channels 47 becomes higher than the flow rate of water (low-temperature hot water) flowing in the plurality of water flow channels 53.
- the number of water flow channels 47 of the first heat exchange unit 31 may be less than the number of water flow channels 53 of the second heat exchange unit 32.
- the total cross-sectional area of the water flow channels 47 of the first heat exchange unit 31 cut along a plane orthogonal to the B-direction becomes smaller than the total cross-sectional area of the water flow channels 53 of the second heat exchange unit 32 cut along a plane orthogonal to the B-direction.
- water (hot water) flowing inside the water flow channel 53 of the second heat exchange unit 32 is unlikely to flow inside the water flow channel 47 of the first heat exchange unit 31, and the flow rate of hot water flowing inside the water flow channels 47 of the first heat exchange unit 31 can be higher than the flow rate of water flowing inside the water flow channels 53 of the second heat exchange unit 32. Therefore, it is possible to inhibit scale from growing inside the water flow channels 47 of the first heat exchange unit 31.
- FIG. 4 is a system diagram showing a schematic configuration of a water heating system according to a modification example of the first embodiment of the present invention.
- the same reference signs are applied to configuration parts the same as in the structure shown in FIG. 1 .
- a water heating system 70 of the modification example of the first embodiment has a configuration similar to that of the water heating system 10, except for having a refrigerant unit 71 in place of the refrigerant unit 11 configuring the water heating system 10 of the first embodiment.
- the refrigerant unit 71 has a configuration similar to that of the refrigerant unit 11, except for having a heat exchanger 73 in place of the heat exchanger 23 configuring the refrigerant unit 11 described in the first embodiment.
- the heat exchanger 73 has a configuration similar to that of the heat exchanger 23 described in the first embodiment, except for including a heat exchanger main body 75 which is divided into three in the X-direction and has first to third heat exchange units 76 to 78, and having two structures each of which is constituted by the first connection supply line 35, the valves 36, 37, 42, 43, and the second connection supply line 41.
- the first to third heat exchange units 76 to 78 are arranged in the X-direction in a state of being separated from one another.
- the first heat exchange unit 76 has the water flow channel 47 shown in FIG. 2 .
- the second heat exchange unit 77 is disposed between the first heat exchange unit 76 and the third heat exchange unit 78.
- the second heat exchange unit 77 has the water flow channel 53 shown in FIG. 3 .
- the third heat exchange unit 78 is connected to the refrigerant circulation line 15 and the water guide-in line 61.
- the third heat exchange unit 78 has a configuration similar to that of the second heat exchange unit 77.
- Water guided into the third heat exchange unit 78 is supplied to the third heat exchange unit 78 via the second heat exchange unit 77.
- the refrigerant supplied to the third heat exchange unit 78 is supplied to the first heat exchange unit 76 via the second heat exchange unit 77.
- the structures each of which is constituted by the first connection supply line 35, the valves 36, 37, 42, 43, and the second connection supply line 41 are each provided between the first heat exchange unit 76 and the second heat exchange unit 77, and between the second heat exchange unit 77 and the third heat exchange unit 78.
- One of two structures connects the first heat exchange unit 76 and the second heat exchange unit 77, and the other connects the second heat exchange unit 77 and the third heat exchange unit 78.
- the first to third heat exchange units 76 to 78 disposed in the X-direction are connected in series by the two structures.
- the heat exchanger main body 75 may be divided into three.
- the water heating system 70 of the modification example of the first embodiment having such a configuration can attain an effect similar to that of the water heating system 10 of the first embodiment.
- the heat exchanger main body 75 is divided into three.
- the heat exchanger main body 75 may be divided into four or more, as necessary. That is, the configuration is acceptable as long as the heat exchanger main body 75 is divided into at least two (at least a high-temperature side and a low-temperature side) or more.
- FIG. 5 is a cross-sectional view showing an alternative example of the first heat exchange unit.
- FIG. 6 is a cross-sectional view showing an alternative example of the second heat exchange unit.
- first and second heat exchange units 81, 91 are shown of an exemplary case where a layered plate-type heat exchanger is employed.
- the same reference signs are applied to configuration parts the same as in the structure shown in FIG. 5 .
- the first and second heat exchange units 31, 32 are described of an exemplary case where the tube-type heat exchanger is employed.
- the layered plate-type heat exchanger having the first and second heat exchange units 81, 91 shown in FIGS. 5 and 6 may be employed.
- the first heat exchange unit 81 has a three-layer configuration in which a first plate 85 and a second plate 86 are alternately layered on a base plate 83 in this order.
- the first heat exchange unit 81 has refrigerant flow channels 87 and water flow channels 88.
- each of the first plates 85 recessed portions 85A extending in the predetermined direction (the X-direction shown in FIG. 1 ) are disposed at predetermined intervals in a direction orthogonal to the predetermined direction.
- the first plates 85 are disposed on the base plate 83 such that the recessed portions 85A face the base plate 83.
- the refrigerant flow channels 87 are defined by the top surface of the base plate 83 and the recessed portions 85A and function as flow channels in which the refrigerant flows.
- recessed portions 86A extending in the predetermined direction (the X-direction shown in FIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction.
- the second plate 86 is disposed on the first plate 85 such that the recessed portions 86A face the first plate 85.
- the water flow channels 88 are defined by the top surface of the first plate 85 and the recessed portions 86A and function as water flow channels in which water flows.
- the second heat exchange unit 91 has a three-layer configuration in which a first plate 92 and a second plate 93 are alternately layered on the base plate 83 in this order.
- the second heat exchange unit 91 has refrigerant flow channels 95 and water flow channels 96.
- the first plates 92 have configurations similar to those of the first plates 85 described above.
- the first plates 92 are disposed on the base plate 83 such that a plurality of recessed portions 85A face the base plate 83.
- the refrigerant flow channels 95 are defined by the top surface of the base plate 83 and the recessed portions 85A, and the refrigerant flows therein.
- recessed portions 93A extending in the predetermined direction (the X-direction shown in FIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction.
- the second plate 93 is disposed on the first plate 92 such that the recessed portions 93A face the top surface of the first plate 92.
- the water flow channels 96 are defined by the top surface of the first plate 92 and the recessed portions 93A, and water flows therein.
- the recessed portions 85A, 93A are the same as one other in width and depth and the recessed portion 86A has a width and a depth smaller than the widths and the depths of the recessed portions 85A, 93A.
- the total value of the cross-sectional areas of a plurality of water flow channels 88 when cut along a plane orthogonal to the predetermined direction can be smaller than the total value of the cross-sectional areas of a plurality of water flow channels 96 when cut along a plane orthogonal to the predetermined direction (the X-direction shown in FIG. 1 ).
- the flow rate of hot water (water) flowing in the plurality of water flow channels 88 can be higher than the flow rate of water flowing inside the plurality of water flow channels 96. Therefore, it is possible to inhibit scale from growing inside the water flow channels 88 of the first heat exchange unit 81.
- FIG. 7 is a cross-sectional view showing another alternative example of the first heat exchange unit.
- the same reference signs are applied to configuration parts the same as in the structures shown in FIGS. 5 and 6 .
- FIG. 8 is a cross-sectional view showing another alternative example of the second heat exchange unit.
- the same reference signs are applied to configuration parts the same as in the structures shown in FIGS. 5 to 7 .
- first and second heat exchange units 100, 105 are shown in exemplary cases in which the layered plate-type heat exchanger is employed.
- the first heat exchange unit 100 has a three-layer configuration in which the first plate 85 and a second plate 101 are alternately layered on the base plate 83 in this order.
- the first heat exchange unit 100 has the refrigerant flow channels 87 and water flow channels 102.
- recessed portions 101A extending in the predetermined direction (the X-direction shown in FIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction.
- the second plate 101 is disposed on the first plate 85 such that the recessed portions 101A face the first plate 85.
- the water flow channels 102 are defined by the top surface of the first plate 85 and the recessed portions 101A and function as water flow channels in which water flows.
- the second heat exchange unit 105 has a five-layered configuration in which a first plate 106 and a second plate 107 are alternately layered on the base plate 83 in this order.
- the second heat exchange unit 105 has refrigerant flow channels 108 and water flow channels 109.
- the first plates 106 have configurations similar to those of the first plates 85 described above.
- the first plates 106 are disposed on the base plate 83 such that the plurality of recessed portions 85A face the base plate 83.
- the refrigerant flow channels 108 are defined by the top surface of the base plate 83 and the recessed portions 85A, and the refrigerant flows therein.
- recessed portions 107A extending in the predetermined direction (the X-direction shown in FIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction.
- Each of the second plates 107 is disposed on the first plate 106 such that the recessed portions 107A face the top surface of the first plate 106.
- the water flow channels 109 are defined by the top surface of the first plate 106 and the recessed portions 107A, and water flows therein.
- the recessed portions 85A, 101A, 107A are the same as one another in width and depth.
- the total value of the cross-sectional areas of a plurality of water flow channels 102 when cut along a plane orthogonal to the predetermined direction can be smaller than the total value of the cross-sectional areas of a plurality of water flow channels 109 when cut along a plane orthogonal to the predetermined direction (the X-direction shown in FIG. 1 ).
- the flow rate of hot water (water) flowing in the plurality of water flow channels 102 can be higher than the flow rate of water flowing inside the plurality of water flow channels 109. Therefore, it is possible to inhibit scale from growing inside the water flow channels 109 of the first heat exchange unit 100.
- FIG. 9 is a system diagram showing a schematic configuration of a water heating system according to a second embodiment of the present invention.
- the same reference signs are applied to configuration parts the same as in the water heating system 10 of the first embodiment shown in FIG. 1 .
- a water heating system 120 of the second embodiment has a refrigerant unit 121, a water circulation unit 122, and the hot water storage unit 12.
- the refrigerant unit 121 has the refrigerant circulation line 15, the expansion valve 17, the vaporizer 18, the compressor 21, and a first heat exchanger 125.
- One end of the refrigerant circulation line 15 is connected to one end of the first heat exchanger 125, and the other end thereof is connected to the other end of the first heat exchanger 125.
- the first heat exchanger 125 is configured to perform heat exchange between a refrigerant (for example, CO 2 ) flowing in the refrigerant circulation line 15 and first water circulating inside the water circulation unit 122 and is configured to turn the first water into first hot water.
- a refrigerant for example, CO 2
- the water circulation unit 122 has a water circulation line 127, the valves 25, 26, a second heat exchanger 128, and a pump 129.
- the water circulation line 127 is a line configured to be a closed loop and to cause the first water to circulate.
- the water circulation line 127 connects the first heat exchanger 125 and the second heat exchanger 128.
- the water circulation line 127 is configured to cause the first water to circulate in the first and second heat exchangers 125, 128.
- the water circulation line 127 in which the first water circulates is caused to be the closed loop, water containing many hardness components such as calcium and magnesium is no longer supplied to the first heat exchanger 125 from outside of the water heating system 120. Therefore, scale is inhibited from growing on a high-temperature side inside the first heat exchanger 125. Therefore, there is no need for the first heat exchanger 125 to be divided into a plurality of units as in the heat exchanger 23 described in FIG. 1 .
- the first heat exchanger 125 is a heat exchanger requiring a frequency of maintenance lower than that of the second heat exchanger 128.
- the valve 25 is provided in the water circulation line 127 which is positioned on an exit side (a side from which the first hot water is guided out) of the second heat exchanger 128.
- the valve 26 is provided in the water circulation line 127 which is positioned on an entrance side (a side into which the first water is guided) of the second heat exchanger 128.
- the second heat exchanger 128 has a configuration similar to that of the heat exchanger 23 shown in FIG. 1 .
- the first and second heat exchange units 31, 32 configuring the second heat exchanger 128, for example it is possible to employ heat exchange units having the structures shown in FIGS. 2, 3 , and 5 to 8 .
- the second heat exchanger 128 is connected to the water guide-in line 61 and the hot water guide-in line 66 configuring the hot water storage unit 12. Accordingly, second water is supplied to the second heat exchanger 128 from the hot water storage tank 56.
- the second heat exchanger 128 is configured to perform heat exchange between the first hot water guided out from the first heat exchanger 125 and the second water supplied via the water guide-in line 61 and is configured to turn the second water into second hot water.
- the second hot water is guided out from the first heat exchange unit 31, and then, the second hot water is guided into the upper portion of the hot water storage tank 56.
- the second heat exchanger 128 divided into a plurality of units in the case of FIG. 9 , two
- the second heat exchanger 128 divided into a plurality of units in the case of FIG. 9 , two
- the water heating system 120 of the second embodiment having the above-described configuration can attain an effect similar to that of the water heating system 10 of the first embodiment.
- the second heat exchanger 128 is acceptable as long as the heat exchanger main body 30 is divided into two or more parts.
- Example 1 the length L 1 of the first heat exchange unit 31 was set to 0.5, and the length L 2 of the second heat exchange unit 32 was set to 0.5.
- Example 3 the length L 1 of the first heat exchange unit 31 was set to 0.4, and the length L 2 of the second heat exchange unit 32 was set to 0.6.
- Example 4 the length L 1 of the first heat exchange unit 31 was set to 0.3, and the length L 2 of the second heat exchange unit 32 was set to 0.7.
- Example 1 the flow rate of water flowing inside the second heat exchange unit 32 was set to 0.8 (80% of the flow rate of water flowing inside the heat exchanger main body of Comparative Example). In Example 2, the flow rate of water flowing inside the second heat exchange unit 32 was set to 0.7. In Example 3, the flow rate of water flowing inside the second heat exchange unit 32 was set to 0.6.
- Example 1 With reference to Table 1, in Example 1, the flow rate in the first heat exchange unit 31 was 1.5 times the flow rate in the second heat exchange unit 32, and the total pressure loss was 1.04 being close to 1. According to the results, in Example 1, the flow rate in the first heat exchange unit 31 was a sufficient flow rate, and the result for the total pressure loss was also an extremely satisfactory value.
- Example 2 although the result for the total pressure loss was a value slightly higher than that in Example 1, the flow rate in the first heat exchange unit 31 was 3.0 times the flow rate in the second heat exchange unit 32, and satisfactory results were achieved.
- Example 3 result for the total pressure loss was 1.0, which was a value slightly lower than that in Example 2.
- the flow rate in the first heat exchange unit 31 was 2.33 times the flow rate in the second heat exchange unit 32, and satisfactory results were achieved.
- Example 4 the flow rate in the first heat exchange unit 31 was 3.0 times the flow rate in the second heat exchange unit 32, and the total pressure loss was 0.85 being lower than 1. According to the results, in Example 4, the flow rate in the first heat exchange unit 31 was a sufficient flow rate, and the result for the total pressure loss was also an extremely satisfactory value.
- the length L 1 of the first heat exchange unit 31 in Example 4 was 0.3 times the length L of the heat exchanger main body 30.
- the location where scale precipitated was the first heat exchange unit 31 in which the temperature of water rose to 60°C or higher.
- the ratio of the length being 0.3 times the length L of the heat exchanger main body 30 could be realized.
- the flow rate in the first heat exchange unit 31 can be sufficiently higher than (be 1.5 times or more than) the flow rate in the second heat exchange unit 32 when the length L 1 of the first heat exchange unit 31 is equal to or shorter than 0.5 times the entire length including the length L 2 of the second heat exchange unit 32, in a case where the heat exchanger main body 30 is divided into two units.
- scale can be inhibited from growing in the first heat exchange unit 31.
- the flow rate of water flowing in the water flow channel of the first heat exchange unit 31 preferably ranges from 1.5 times to 3.0 times the flow rate of water flowing in the water flow channel of the second heat exchange unit 32.
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Abstract
Description
- The present invention relates to a water heating system.
- In the related art, as a water heating system in which water is configured to turn into hot water due to heat exchange between a refrigerant and the water, for example, a heat pump-type water heating system is known.
- The heat pump-type water heating system is configured to include a refrigerant unit that includes a refrigerant circulation line in which a refrigerant circulates, and a compressor, a vaporizer, and a heat exchanger which are provided in the refrigerant circulation line; and a hot water storage unit that includes a water flow channel which is connected to the heat exchanger and in which water or hot water flows, a pump which is provided in the water flow channel, a hot water storage tank which is connected to the water flow channel, and a water supply line which is configured to supply water from outside to a lower portion of the hot water storage tank.
- In the water heating system having the above-described configuration, when water in the water flow channel is guided into the heat exchanger configuring the refrigerant unit, the temperature of the water rises and the water turns into hot water due to heat exchange between the refrigerant flowing inside the heat exchanger and the water. Then, the hot water is guided into the hot water storage tank.
- As water flowing in the water flow channel, for example, tap water, underground water, or the like is employed. However, water, such as tap water, underground water, and the like, contains hardness components such as calcium and magnesium, and there are cases of a remarkably significant amount of the hardness components being contained, depending on the geographical zone.
- When water containing a significant amount of such hardness components is supplied from outside of the water heating system to the inside of the hot water storage tank via the water supply line, and when the refrigerant and the water supplied through the water supply line are subjected to heat exchange inside the heat exchanger for a long period of time, there is a possibility that the hardness components will precipitate as scale on an exit side (a high-temperature part where the temperature of hot water is high) of the water flow channel inside the heat exchanger.
- When such scale is deposited on a heat transfer surface or an inner circumferential surface of the water flow channel, the deposited scale hinders the flow of water, so that the pressure loss increases and the load on the pump increases. Accordingly, there is concern that the performance of the heat exchanger will prominently deteriorate.
- Moreover, when the water flow channel is completely blocked by scale, the water heating system is no longer able to perform a water heating operation.
- As a technology which can resolve such a problem,
Patent Document 1 discloses a heat-pump water heater in which a heat exchanger can be divided into a high-temperature part (a part where the temperature of hot water is high) and a low-temperature part (a part where the temperature of water is not so high), and the high-temperature part is configured to be attachable and detachable. - In the heat-pump water heater having such a configuration, when scale grows in the high-temperature part, the high-temperature part in which scale has grown is replaced with a different high-temperature part to which no scale is adhering, or a water flow channel in only the high-temperature part is cleaned. Consequently, increase in load on a pump can be inhibited and blocking of the water flow channel because of scale can be inhibited.
- When no water is supplied from outside to the inside of the hot water storage tank and water is caused to circulate in a closed loop, since water containing the aforementioned high-hardness components is not newly supplied from outside, scale is unlikely to be generated in the water flow channel provided in the high-temperature part of the heat exchanger.
- [Patent Document 1] Japanese Unexamined Patent Application, First Publication No.
2004-144445 - The technology disclosed in the
aforementioned Patent Document 1 is a technology for improving the efficiency of maintenance of the heat exchanger after scale adheres to or grows in the water flow channel on a high-temperature side in the heat exchanger. - Therefore, in the technology disclosed in
Patent Document 1, preventing scale from adhering to the water flow channel in the high-temperature part of the heat exchanger is not considered. - Therefore, when employing the technology disclosed in
Patent Document 1, there is a need to regularly perform processing of replacing the high-temperature part or cleaning the water flow channel to which scale adheres in the high-temperature part, at the stage in which a certain amount of scale has adhered thereto, thereby leading to a problem in that the frequency of maintenance of the heat exchanger increases. - The present invention aims to provide a water heating system capable of reducing the frequency of maintenance of a heat exchanger required because of scale.
- In order to solve the problem, according to an aspect of the present invention, there is provided a water heating system including a refrigerant unit that includes a refrigerant circulation line in which a refrigerant circulates, a vaporizer which is provided in the refrigerant circulation line, is configured to vaporize the liquid refrigerant decompressed by an expansion valve, and is configured to generate refrigerant gas, a compressor which is provided in the refrigerant circulation line, and is configured to compress the refrigerant gas guided out from the vaporizer, and a heat exchanger which is provided in the refrigerant circulation line, is configured to perform heat exchange between the refrigerant gas guided out from the compressor and water, and is configured to turn the water into hot water; and a hot water storage unit that includes a hot water storage tank which stores the hot water, a water guide-in line which is configured to guide the water stored in a lower portion inside the hot water storage tank into the heat exchanger through one end of the heat exchanger, a hot water guide-in line which is connected to the other end of the heat exchanger and is configured to guide the hot water to an upper portion of the hot water storage tank, and a water supply line which is configured to supply water from outside to the lower portion inside the hot water storage tank. The heat exchanger has a plurality of heat exchange units which are separated from each other in a predetermined direction and are connected to each other in series. The plurality of heat exchange units each include at least one water flow channel in which the water flows. The plurality of heat exchange units include at least a first heat exchange unit configuring the other end of the heat exchanger, and a second heat exchange unit being disposed in the vicinity of the first heat exchange unit in a direction in which the water flows. A total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows is smaller than a total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- According to the present invention, when the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows is smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows, the flow rate of hot water (water) flowing in the water flow channel of the first heat exchange unit in which the temperature of hot water is high such that scale is likely to be generated becomes higher than the flow rate of water (low-temperature hot water) flowing in the water flow channel of the second heat exchange unit. Therefore, it is possible to inhibit scale from being deposited in the water flow channel of the first heat exchange unit.
- Accordingly, the water flow channel of the first heat exchange unit can be retained in an environment in which scale is unlikely to grow. Thus, it is possible to reduce the frequency of maintenance of the heat exchanger required because of scale.
- In addition, in the water heating system according to the aspect of the present invention, the diameter of the water flow channel of the first heat exchange unit may be smaller than the diameter of the water flow channel of the second heat exchange unit.
- In such a configuration, the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows can be smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- Accordingly, the flow rate of hot water flowing in the water flow channel of the first heat exchange unit becomes higher than the flow rate of water flowing in the water flow channel of the second heat exchange unit. Thus, it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- In addition, in the water heating system according to the aspect of the present invention, the number of water flow channels of the first heat exchange unit may be less than the number of water flow channels of the second heat exchange unit.
- In such a configuration, the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows can be smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- Accordingly, the flow rate of hot water flowing in the water flow channel of the first heat exchange unit becomes higher than the flow rate of water flowing in the water flow channel of the second heat exchange unit. Thus, it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- In addition, in the water heating system according to the aspect of the present invention, the heat exchanger may be divided into two units and may be configured to include the first heat exchange unit and the second heat exchange unit. The flow rate of the water flowing in the water flow channel of the first heat exchange unit may range from 1.5 times to 3.0 times a flow rate of the water flowing in the water flow channel of the second heat exchange unit.
- In this manner, in a case where the heat exchanger is configured to include the first heat exchange unit disposed on a high-temperature side (side on which the temperature of hot water (water) is higher than that in the second heat exchange unit) and the second heat exchange unit, when the flow rate of water flowing in the water flow channel of the first heat exchange unit is lower than 1.5 times the flow rate of water flowing in the water flow channel of the second heat exchange unit, there is concern that an effect of washing away the scale will deteriorate.
- Meanwhile, when the flow rate of water flowing in the water flow channel of the first heat exchange unit is higher than 3.0 times the flow rate of water flowing in the water flow channel of the second heat exchange unit, there is concern that the total value of the pressure loss caused due to the lengths of the first and second heat exchange units will increase.
- Therefore, when the flow rate of water flowing in the water flow channel of the first heat exchange unit ranges from 1.5 times to 3.0 times the flow rate of water flowing in the water flow channel of the second heat exchange unit, an increase in the total value of the pressure loss of the first and second heat exchange units is inhibited, and it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- In addition, in the water heating system according to the aspect of the present invention, a length of the first heat exchange unit in the predetermined direction may be equal to or shorter than 0.5 times a length of the heat exchanger that is the sum total of a length of the second heat exchange unit in the predetermined direction and the length of the first heat exchange unit.
- In this manner, in a case of being divided into two and having the first and second heat exchange units, when the length of the first heat exchange unit in the predetermined direction is longer than 0.5 times the length of the second heat exchange unit in the predetermined direction, the length of the water flow channel of the first heat exchange unit is lengthened, so that the pressure loss in the first heat exchange unit increases. Thus, there is concern that the total pressure loss of the first and second heat exchange units will increase.
- Therefore, when the length of the first heat exchange unit is equal to or shorter than 0.5 times the length of the second heat exchange unit, the pressure loss in the first heat exchange unit is reduced, and it is possible to sufficiently inhibit scale from growing in the water flow channel of the first heat exchange unit.
- According to another aspect of the present invention, there is provided a water heating system including a refrigerant unit that includes a refrigerant circulation line in which a refrigerant circulates, a vaporizer which is provided in the refrigerant circulation line, is configured to vaporize the liquid refrigerant decompressed by an expansion valve, and is configured to generate refrigerant gas, a compressor which is provided in the refrigerant circulation line, and is configured to compress the refrigerant gas guided out from the vaporizer, and a first heat exchanger which is provided in the refrigerant circulation line, is configured to perform heat exchange between the refrigerant gas guided out from the compressor and first water, and is configured to turn the first water into first hot water; a water circulation unit that includes a water circulation line which is configured to be a closed loop such that the first water circulates, and is configured to cause the first water to circulate in the first heat exchanger, and a second heat exchanger which is provided in the water circulation line, is configured to perform heat exchange between the first hot water and second water, and is configured to turn the second water into second hot water; and a hot water storage unit that includes a hot water storage tank which stores the second hot water, a water guide-in line which is configured to guide the second water stored in a lower portion inside the hot water storage tank into the second heat exchanger through one end of the second heat exchanger, a hot water guide-in line which is connected to the other end of the second heat exchanger and is configured to guide the second hot water to an upper portion inside the hot water storage tank, and a water supply line which is configured to supply the second water from outside to the lower portion inside the hot water storage tank. The second heat exchanger has a plurality of heat exchange units which are separated from each other in a predetermined direction and are connected to each other in series. The plurality of heat exchange units each include at least one water flow channel in which the second water flows. The plurality of heat exchange units include at least a first heat exchange unit configuring the other end of the second heat exchanger, and a second heat exchange unit being disposed in the vicinity of the first heat exchange unit in a direction in which the second water flows. The total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows is smaller than a total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows.
- According to the present invention, when the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows is smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows, the flow rate of the second hot water (the second water) flowing in the water flow channel of the first heat exchange unit in which the temperature of the second hot water is high such that scale is likely to be generated can be higher than the flow rate of the second water flowing in the water flow channel of the second heat exchange unit.
- Accordingly, scale can be inhibited from being deposited in the water flow channel of the first heat exchange unit. Thus, it is possible to reduce the frequency of maintenance of the heat exchanger required because of scale.
- In addition, in the water heating system according to the aspect of the present invention, the diameter of the water flow channel of the first heat exchange unit may be smaller than the diameter of the water flow channel of the second heat exchange unit.
- In such a configuration, the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows becomes smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows. Thus, the second water (the second hot water) flowing in the water flow channel of the second heat exchange unit is unlikely to flow in the water flow channel of the first heat exchange unit.
- Accordingly, the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit can be higher than the flow rate of the second water flowing in the water flow channel of the second heat exchange unit. Thus, it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit, due to the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit.
- In addition, in the water heating system according to the aspect of the present invention, the number of water flow channels of the first heat exchange unit may be less than the number of water flow channels of the second heat exchange unit.
- In such a configuration, the total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows becomes smaller than the total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows. Thus, the second water (the second hot water) flowing in the water flow channel of the second heat exchange unit is unlikely to flow in the water flow channel of the first heat exchange unit.
- Accordingly, the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit can be higher than the flow rate of the second water flowing in the water flow channel of the second heat exchange unit. Thus, it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit, due to the flow rate of the second hot water flowing in the water flow channel of the first heat exchange unit.
- According to the present invention, it is possible to reduce the frequency of maintenance of a heat exchanger required because of scale.
-
-
FIG. 1 is a system diagram showing a schematic configuration of a water heating system according to a first embodiment of the present invention. -
FIG. 2 is a cross-sectional view cut along line C1-C2 in a first heat exchange unit configuring a heat exchanger shown inFIG. 1 . -
FIG. 3 is a cross-sectional view cut along line D1-D2 in a second heat exchange unit configuring the heat exchanger shown inFIG. 1 . -
FIG. 4 is a system diagram showing a schematic configuration of a water heating system according to a modification example of the first embodiment of the present invention. -
FIG. 5 is a cross-sectional view (Alternative 1) showing an alternative example of the first heat exchange unit. -
FIG. 6 is a cross-sectional view (Alternative 1) showing an alternative example of the second heat exchange unit. -
FIG. 7 is a cross-sectional view (Alternative 2) showing another alternative example of the first heat exchange unit. -
FIG. 8 is a cross-sectional view (Alternative 2) showing another alternative example of the second heat exchange unit. -
FIG. 9 is a system diagram showing a schematic configuration of a water heating system according to a second embodiment of the present invention. - Hereinafter, embodiments in which the present invention is applied will be described in detail, with reference to the drawings. The drawings in the descriptions below are used for describing the configurations of the embodiments of the present invention. There are cases where the sizes, the thicknesses, the dimensions, and the like of the respective shown units and portions are different due to dimensional relationships in an actual water heating system.
-
FIG. 1 is a system diagram showing a schematic configuration of a water heating system according to a first embodiment of the present invention. InFIG. 1 , as an example of the water heating system of the first embodiment, a heat pump-type water heating system is shown. - In
FIG. 1 , "A" indicates a direction (hereinafter, will be referred to as "A-direction") in which a refrigerant moves inside aheat exchanger 23, "B" indicates a direction (hereinafter, will be referred to as "B-direction") in which water moves inside theheat exchanger 23, and "X" indicates a predetermined direction (hereinafter, will be referred to as "X-direction") in which first and secondheat exchange units - With reference to
FIG. 1 , awater heating system 10 of the first embodiment has a refrigerant unit 11 and a hotwater storage unit 12. - The refrigerant unit 11 has a
refrigerant circulation line 15, anexpansion valve 17, avaporizer 18, acompressor 21, theheat exchanger 23, andvalves - One end of the
refrigerant circulation line 15 is connected to oneend 23A of theheat exchanger 23, and the other end thereof is connected to theother end 23B of theheat exchanger 23. Therefrigerant circulation line 15 is a line for causing the refrigerant (for example, CO2) to circulate. - The
expansion valve 17 is provided in therefrigerant circulation line 15. Theexpansion valve 17 is disposed on the downstream side of theheat exchanger 23 when seen based on a flowing direction of the refrigerant. A low-temperature/high-pressure liquid refrigerant guided out from theheat exchanger 23 is supplied to theexpansion valve 17. In theexpansion valve 17, the low-temperature/high-pressure liquid refrigerant is decompressed, and a low-temperature/low-pressure liquid refrigerant is generated. - The
vaporizer 18 is provided in therefrigerant circulation line 15. Thevaporizer 18 is disposed on the downstream side of theexpansion valve 17 when seen based on the flowing direction of the refrigerant. In thevaporizer 18, the low-temperature/low-pressure liquid refrigerant which has passed through theexpansion valve 17 is vaporized, and a low-temperature/low-pressure gas refrigerant is generated. - The
compressor 21 is provided in therefrigerant circulation line 15. Thecompressor 21 is disposed between thevaporizer 18 and theother end 23B of theheat exchanger 23. - The
compressor 21 is configured to cause the low-temperature/low-pressure gas refrigerant guided out from thevaporizer 18 to be compressed and to rise in temperature, thereby generating a high-temperature/high-pressure gas refrigerant. The high-temperature/high-pressure gas refrigerant is guided into theheat exchanger 23 from theother end 23B side of theheat exchanger 23. - The
heat exchanger 23 has a heat exchangermain body 30 including the first and secondheat exchange units connection supply line 35;valves connection supply line 41. - The heat exchanger
main body 30 is divided into the firstheat exchange unit 31 and the secondheat exchange unit 32 in the X-direction (the predetermined direction). The firstheat exchange unit 31 configures theother end 23B of theheat exchanger 23. -
FIG. 2 is a cross-sectional view cut along line C1-C2 in the first heat exchange unit configuring the heat exchanger shown inFIG. 1 .FIG. 2 shows a cross section of a tube-type heat exchanger as an example of the firstheat exchange unit 31. InFIG. 2 , the same reference signs are applied to configuration parts the same as in the structure shown inFIG. 1 . - Subsequently, with reference to
FIGS. 1 and2 , the firstheat exchange unit 31 will be described. The firstheat exchange unit 31 configures theother end 23B and has atube 45 andplates 46. - One end of the
tube 45 is connected to the secondconnection supply line 41, and the other end (an end disposed on theother end 23B side) thereof is connected to one end of a hot water guide-out line 68 (will be described below). Thetube 45 defines awater flow channel 47. - In the
water flow channel 47, low-temperature hot water (water) supplied from the secondheat exchange unit 32 via the secondconnection supply line 41 flows in the B-direction. A diameter R1 (in this case, the bore diameter, corresponding to the inner diameter of the tube 45) of thewater flow channel 47 is uniform in size in the X-direction. - A plurality of
plates 46 are disposed at predetermined intervals so as to be orthogonal to an extending direction of thetube 45. The plurality ofplates 46 support thetube 45 and define spaces for accommodating the refrigerant (specifically, the high-temperature/high-pressure gas refrigerant guided out from the compressor 21). - In the first
heat exchange unit 31 having the above-described configuration, low-temperature hot water (water) guided out from the secondheat exchange unit 32 and a high-temperature/high-pressure gas refrigerant guided out from thecompressor 21 are subjected to heat exchange, so that the temperature of the hot water becomes high (for example, a temperature equal to or higher than 60°C). In the firstheat exchange unit 31, the high-temperature hot water is guided into an upper portion of a hotwater storage tank 56 via a hot water guide-inline 66. -
FIG. 3 is a cross-sectional view cut along line D1-D2 in the second heat exchange unit configuring the heat exchanger shown inFIG. 1 .FIG. 3 shows a cross section of the tube-type heat exchanger as an example of the secondheat exchange unit 32. InFIG. 3 , the same reference signs are applied to configuration parts the same as in the structure shown inFIG. 1 . - Subsequently, with reference to
FIGS. 1 and3 , the secondheat exchange unit 32 will be described. The secondheat exchange unit 32 configures the oneend 23A and has atube 51 andplates 52. - One end (an end disposed on the one
end 23A side) of thetube 51 is connected to a water guide-inline 61, and the other end thereof is connected to the secondconnection supply line 41. Thetube 51 defines awater flow channel 53. - Water guided out from a lower portion (for example, the bottom) of the hot
water storage tank 56 is supplied to thewater flow channel 53 via the secondconnection supply line 41. A diameter R2 (in this case, the bore diameter, corresponding to the inner diameter of the tube 51) of thewater flow channel 53 is uniform in size in the X-direction. - Water is supplied to the lower portion of the hot
water storage tank 56 from outside of thewater heating system 10 via a water supply line 58 (will be described below). There are cases where the water contains many hardness components such as calcium and magnesium. When the temperature of the water rises to 60°C or higher, the hardness components cause scale. - A plurality of
plates 52 are disposed at predetermined intervals so as to be orthogonal to an extending direction of thetube 51. The plurality ofplates 52 support thetube 51 and define spaces for accommodating the refrigerant (specifically, the gas refrigerant supplied via the first heat exchange unit 31). - In the second
heat exchange unit 32 having the above-described configuration, water (for example, approximately 20°C) guided out from the hotwater storage tank 56 and the gas refrigerant which has passed through the firstheat exchange unit 31 are subjected to heat exchange, so that water is heated and is configured to turn into low-temperature hot water (water) (for example, a temperature ranging from 20°C to less than 60°C). - Then, the low-temperature hot water (water) is guided into the
tube 45 shown inFIG. 2 , via the secondconnection supply line 41. - In the heat exchanger
main body 30 having the above-described configuration, the diameter R1 of thewater flow channel 47 of the firstheat exchange unit 31 is configured to be smaller than the diameter R2 of thewater flow channel 53 of the secondheat exchange unit 32. - In this manner, when the diameter R1 of the
water flow channel 47 of the firstheat exchange unit 31 is smaller than the diameter R2 of thewater flow channel 53 of the secondheat exchange unit 32, a cross-sectional area of thewater flow channel 47 of the firstheat exchange unit 31 cut along a plane orthogonal to the B-direction can be smaller than a cross-sectional area of thewater flow channel 53 of the secondheat exchange unit 32 cut along a plane orthogonal to the B-direction. - Accordingly, the flow rate of hot water (water) flowing in the
water flow channel 47 of the firstheat exchange unit 31 in which the temperature of hot water is high such that scale is likely to be generated becomes higher than the flow rate of water (low-temperature hot water) flowing in thewater flow channel 53 of the secondheat exchange unit 32. Therefore, in an early stage in which scale is generated in thewater flow channel 47 of the firstheat exchange unit 31, it is possible to wash the scale out of the firstheat exchange unit 31 by utilizing the flow rate of the hot water. - Therefore, the
water flow channel 47 of the firstheat exchange unit 31 can be retained in an environment in which scale is unlikely to grow. Thus, it is possible to reduce the frequency of maintenance of theheat exchanger 23 required because of scale. - For example, it is advisable to set the sizes of the diameter R1 of the
water flow channel 47 and the diameter R2 of thewater flow channel 53 such that, for example, shear stress becomes equal to or greater than 30 MPa in regard to the flow rate of hot water (water) flowing in thewater flow channel 47 of the firstheat exchange unit 31. Thus, when such a condition is satisfied, it is possible to further reduce the frequency of maintenance of theheat exchanger 23 required because of scale. - One end of the first
connection supply line 35 is connected to the firstheat exchange unit 31, and the other end thereof is connected to the secondheat exchange unit 32. Refrigerant gas supplied via the firstheat exchange unit 31 is guided out to the firstconnection supply line 35. The refrigerant gas is guided into the secondheat exchange unit 32 via the firstconnection supply line 35. - The
valve 36 is provided in the firstconnection supply line 35 which is disposed on the firstheat exchange unit 31 side. Thevalve 37 is provided in the firstconnection supply line 35 which is disposed between thevalve 36 and the secondheat exchange unit 32. - The
valves heat exchanger 23. - The second
connection supply line 41 couples thetube 45 shown inFIG. 2 and thetube 51 shown inFIG. 3 together. It is advisable that the inner diameter of the secondconnection supply line 41 is equal to the inner diameter of the tube 51 (in other words, the diameter of the water flow channel 53). - In this manner, when the inner diameter of the second
connection supply line 41 and the inner diameter of thetube 51 are equal to each other, the flow rate of hot water (water) is prevented from being high inside the secondconnection supply line 41. Therefore, the flow rate of the hot water (water) can become rapidly high inside the firstheat exchange unit 31. Accordingly, scale generated inside thewater flow channel 47 is unlikely to remain. Thus, it is possible to reduce the frequency of maintenance of theheat exchanger 23 required because of scale. - The
valve 42 is provided in the secondconnection supply line 41 which is disposed on the firstheat exchange unit 31 side. Thevalve 43 is provided in the secondconnection supply line 41 which is disposed between thevalve 42 and the secondheat exchange unit 32. - The
valves heat exchanger 23. - With reference to
FIG. 1 , the hotwater storage unit 12 has the hotwater storage tank 56, thewater supply line 58, the water guide-inline 61, apump 63,valves line 66, and the hot water guide-outline 68. - The hot
water storage tank 56 stores hot water in the upper portion thereof and stores water in the lower portion thereof. - The
water supply line 58 is a line for supplying water to the lower portion of the hotwater storage tank 56 from outside of thewater heating system 10. There are cases where the water contains many hardness components such as calcium and magnesium. - One end of the water guide-in
line 61 is connected to the lower portion inside the hotwater storage tank 56, and the other end thereof is connected to one end of thetube 51. The water guide-inline 61 is configured to supply water stored in the lower portion inside the hotwater storage tank 56 to thewater flow channel 53 shown inFIG. 3 . - The
pump 63 is provided in the water guide-inline 61. Thepump 63 feeds the water stored in the lower portion inside the hotwater storage tank 56 to thewater flow channel 53. - The
valve 64 is provided in the water guide-inline 61 which is disposed between thepump 63 and the secondheat exchange unit 32. Thevalve 65 is provided in the water guide-inline 61 which is disposed between the hotwater storage tank 56 and the secondheat exchange unit 32. Thevalves heat exchanger 23. - One end of the hot water guide-in
line 66 is connected to the other end of thetube 45 shown inFIG. 2 , and the other end thereof is connected to the upper portion of the hot water storage tank 56 (for example, the upper end). The hot water guide-inline 66 is configured to guide high-temperature hot water guided out from thetube 45 into the upper portion of the hotwater storage tank 56. - One end of the hot water guide-out
line 68 is connected to the upper portion of the hot water storage tank 56 (for example, the upper end), and the other end thereof is connected to a usage target (not shown). The hot water guide-outline 68 is configured to supply hot water stored inside the hotwater storage tank 56 to the usage target (not shown). - According to the
water heating system 10 of the first embodiment, when the diameter R1 of thewater flow channel 47 of the firstheat exchange unit 31 is smaller than the diameter R2 of thewater flow channel 53 of the secondheat exchange unit 32, a cross-sectional area of thewater flow channel 47 of the firstheat exchange unit 31 cut along a plane orthogonal to the B-direction can be smaller than a cross-sectional area of thewater flow channel 53 of the secondheat exchange unit 32 cut along a plane orthogonal to the B-direction. - Accordingly, the flow rate of hot water (water) flowing in the
water flow channel 47 of the firstheat exchange unit 31 in which the temperature of hot water is high such that scale is likely to be generated becomes higher than the flow rate of water (low-temperature hot water) flowing in thewater flow channel 53 of the secondheat exchange unit 32. Therefore, it is possible to inhibit scale from being deposited in thewater flow channel 47 of the firstheat exchange unit 31. - Therefore, the
water flow channel 47 of the firstheat exchange unit 31 can be retained in an environment in which scale is unlikely to grow. Thus, it is possible to reduce the frequency of maintenance of theheat exchanger 23 required because of scale. - In addition, when the heat exchanger
main body 30 is divided into two heat exchange units (specifically, the first and secondheat exchange units 31, 32), for example, the flow rate of water flowing in thewater flow channel 47 of the firstheat exchange unit 31 may range from 1.5 times to 3.0 times the flow rate of water (hot water) flowing in thewater flow channel 53 of the secondheat exchange unit 32. - When the flow rate of water flowing in the
water flow channel 47 of the firstheat exchange unit 31 is lower than 1.5 times the flow rate of water flowing in thewater flow channel 53 of the secondheat exchange unit 32, there is concern that an effect of washing away the scale will deteriorate. - Meanwhile, when the flow rate of water flowing in the
water flow channel 47 of the firstheat exchange unit 31 is higher than 3.0 times the flow rate of water flowing in thewater flow channel 53 of the secondheat exchange unit 32, there is concern that the total value of the pressure loss caused due to lengths L1, L2 of the first and secondheat exchange units - Therefore, when the flow rate of water flowing in the water flow channel of the first heat exchange unit ranges from 1.5 times to 3.0 times the flow rate of water flowing in the water flow channel of the second heat exchange unit, the total value of the pressure loss of the first and second heat exchange units is inhibited from increasing, and it is possible to inhibit scale from growing in the water flow channel of the first heat exchange unit.
- Moreover, when the heat exchanger
main body 30 is divided into two heat exchange units (specifically, the first and secondheat exchange units 31, 32), for example, it is advisable that the length L1 of the firstheat exchange unit 31 in the X-direction is equal to or shorter than 0.5 times the length L2 of the secondheat exchange unit 32 in the X-direction. - When the length L1 of the first
heat exchange unit 31 in the X-direction is longer than 0.5 times the length L2 of the secondheat exchange unit 32 in the X-direction, the length of thewater flow channel 53 of the secondheat exchange unit 32 is lengthened. Accordingly, the length of thewater flow channel 47 of the firstheat exchange unit 31 is lengthened, so that the pressure loss in the firstheat exchange unit 31 increases. Thus, there is concern that the total pressure loss of the first and secondheat exchange units - Therefore, when the length L1 of the first
heat exchange unit 31 is equal to or shorter than 0.5 times the length L2 of the secondheat exchange unit 32, the pressure loss in the firstheat exchange unit 31 is reduced, and it is possible to sufficiently inhibit scale from growing in thewater flow channel 47 of the firstheat exchange unit 31. - In the first embodiment, as an example, descriptions are given of an exemplary case where the
tubes water flow channels tubes water flow channels - In this case, it is advisable to have a configuration such that the total cross-sectional area of a plurality of
water flow channels 47 of the firstheat exchange unit 31 cut along a plane orthogonal to the B-direction becomes smaller than the total cross-sectional area of a plurality ofwater flow channels 53 of the secondheat exchange unit 32 cut along a plane orthogonal to the B-direction. - In such a configuration, the flow rate of hot water (water) flowing in the plurality of
water flow channels 47 becomes higher than the flow rate of water (low-temperature hot water) flowing in the plurality ofwater flow channels 53. Thus, it is possible to inhibit scale from being deposited in the plurality ofwater flow channels 47. Accordingly, it is possible to reduce the frequency of maintenance of theheat exchanger 23 required because of scale. - Moreover, for example, the number of
water flow channels 47 of the firstheat exchange unit 31 may be less than the number ofwater flow channels 53 of the secondheat exchange unit 32. - Even in such a case, the total cross-sectional area of the
water flow channels 47 of the firstheat exchange unit 31 cut along a plane orthogonal to the B-direction becomes smaller than the total cross-sectional area of thewater flow channels 53 of the secondheat exchange unit 32 cut along a plane orthogonal to the B-direction. - Accordingly, water (hot water) flowing inside the
water flow channel 53 of the secondheat exchange unit 32 is unlikely to flow inside thewater flow channel 47 of the firstheat exchange unit 31, and the flow rate of hot water flowing inside thewater flow channels 47 of the firstheat exchange unit 31 can be higher than the flow rate of water flowing inside thewater flow channels 53 of the secondheat exchange unit 32. Therefore, it is possible to inhibit scale from growing inside thewater flow channels 47 of the firstheat exchange unit 31. -
FIG. 4 is a system diagram showing a schematic configuration of a water heating system according to a modification example of the first embodiment of the present invention. InFIG. 4 , the same reference signs are applied to configuration parts the same as in the structure shown inFIG. 1 . - With reference to
FIG. 4 , awater heating system 70 of the modification example of the first embodiment has a configuration similar to that of thewater heating system 10, except for having arefrigerant unit 71 in place of the refrigerant unit 11 configuring thewater heating system 10 of the first embodiment. - The
refrigerant unit 71 has a configuration similar to that of the refrigerant unit 11, except for having aheat exchanger 73 in place of theheat exchanger 23 configuring the refrigerant unit 11 described in the first embodiment. - The
heat exchanger 73 has a configuration similar to that of theheat exchanger 23 described in the first embodiment, except for including a heat exchangermain body 75 which is divided into three in the X-direction and has first to thirdheat exchange units 76 to 78, and having two structures each of which is constituted by the firstconnection supply line 35, thevalves connection supply line 41. - The first to third
heat exchange units 76 to 78 are arranged in the X-direction in a state of being separated from one another. The firstheat exchange unit 76 has thewater flow channel 47 shown inFIG. 2 . - The second
heat exchange unit 77 is disposed between the firstheat exchange unit 76 and the thirdheat exchange unit 78. The secondheat exchange unit 77 has thewater flow channel 53 shown inFIG. 3 . - The third
heat exchange unit 78 is connected to therefrigerant circulation line 15 and the water guide-inline 61. The thirdheat exchange unit 78 has a configuration similar to that of the secondheat exchange unit 77. - Water guided into the third
heat exchange unit 78 is supplied to the thirdheat exchange unit 78 via the secondheat exchange unit 77. The refrigerant supplied to the thirdheat exchange unit 78 is supplied to the firstheat exchange unit 76 via the secondheat exchange unit 77. - The structures each of which is constituted by the first
connection supply line 35, thevalves connection supply line 41 are each provided between the firstheat exchange unit 76 and the secondheat exchange unit 77, and between the secondheat exchange unit 77 and the thirdheat exchange unit 78. - One of two structures connects the first
heat exchange unit 76 and the secondheat exchange unit 77, and the other connects the secondheat exchange unit 77 and the thirdheat exchange unit 78. - The first to third
heat exchange units 76 to 78 disposed in the X-direction are connected in series by the two structures. - As in the
heat exchanger 73 described above, the heat exchangermain body 75 may be divided into three. Thewater heating system 70 of the modification example of the first embodiment having such a configuration can attain an effect similar to that of thewater heating system 10 of the first embodiment. - In addition, in
FIG. 4 , as an example, descriptions are given of an exemplary case where the heat exchangermain body 75 is divided into three. However, the heat exchangermain body 75 may be divided into four or more, as necessary. That is, the configuration is acceptable as long as the heat exchangermain body 75 is divided into at least two (at least a high-temperature side and a low-temperature side) or more. -
FIG. 5 is a cross-sectional view showing an alternative example of the first heat exchange unit.FIG. 6 is a cross-sectional view showing an alternative example of the second heat exchange unit. InFIGS. 5 and 6 , first and secondheat exchange units FIG. 6 , the same reference signs are applied to configuration parts the same as in the structure shown inFIG. 5 . - In
FIGS. 2 and 3 described above, the first and secondheat exchange units heat exchange units FIGS. 5 and 6 may be employed. - Here, with reference to
FIGS. 5 and 6 , the first and secondheat exchange units - The first
heat exchange unit 81 has a three-layer configuration in which afirst plate 85 and asecond plate 86 are alternately layered on abase plate 83 in this order. The firstheat exchange unit 81 hasrefrigerant flow channels 87 andwater flow channels 88. - In each of the
first plates 85, recessedportions 85A extending in the predetermined direction (the X-direction shown inFIG. 1 ) are disposed at predetermined intervals in a direction orthogonal to the predetermined direction. Thefirst plates 85 are disposed on thebase plate 83 such that the recessedportions 85A face thebase plate 83. Therefrigerant flow channels 87 are defined by the top surface of thebase plate 83 and the recessedportions 85A and function as flow channels in which the refrigerant flows. - In the
second plate 86, recessedportions 86A extending in the predetermined direction (the X-direction shown inFIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction. Thesecond plate 86 is disposed on thefirst plate 85 such that the recessedportions 86A face thefirst plate 85. - The
water flow channels 88 are defined by the top surface of thefirst plate 85 and the recessedportions 86A and function as water flow channels in which water flows. - The second
heat exchange unit 91 has a three-layer configuration in which afirst plate 92 and asecond plate 93 are alternately layered on thebase plate 83 in this order. The secondheat exchange unit 91 hasrefrigerant flow channels 95 andwater flow channels 96. - The
first plates 92 have configurations similar to those of thefirst plates 85 described above. Thefirst plates 92 are disposed on thebase plate 83 such that a plurality of recessedportions 85A face thebase plate 83. Therefrigerant flow channels 95 are defined by the top surface of thebase plate 83 and the recessedportions 85A, and the refrigerant flows therein. - In the
second plate 93, recessedportions 93A extending in the predetermined direction (the X-direction shown inFIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction. Thesecond plate 93 is disposed on thefirst plate 92 such that the recessedportions 93A face the top surface of thefirst plate 92. - The
water flow channels 96 are defined by the top surface of thefirst plate 92 and the recessedportions 93A, and water flows therein. - In the first and second
heat exchange units portions portion 86A has a width and a depth smaller than the widths and the depths of the recessedportions - In such a configuration, the total value of the cross-sectional areas of a plurality of
water flow channels 88 when cut along a plane orthogonal to the predetermined direction (the X-direction shown inFIG. 1 ) can be smaller than the total value of the cross-sectional areas of a plurality ofwater flow channels 96 when cut along a plane orthogonal to the predetermined direction (the X-direction shown inFIG. 1 ). - Accordingly, the flow rate of hot water (water) flowing in the plurality of
water flow channels 88 can be higher than the flow rate of water flowing inside the plurality ofwater flow channels 96. Therefore, it is possible to inhibit scale from growing inside thewater flow channels 88 of the firstheat exchange unit 81. -
FIG. 7 is a cross-sectional view showing another alternative example of the first heat exchange unit. InFIG. 7 , the same reference signs are applied to configuration parts the same as in the structures shown inFIGS. 5 and 6 . -
FIG. 8 is a cross-sectional view showing another alternative example of the second heat exchange unit. InFIG. 8 , the same reference signs are applied to configuration parts the same as in the structures shown inFIGS. 5 to 7 . InFIGS. 7 and 8 , first and secondheat exchange units - Here, with reference to
FIGS. 7 and 8 , the first and secondheat exchange units - The first
heat exchange unit 100 has a three-layer configuration in which thefirst plate 85 and asecond plate 101 are alternately layered on thebase plate 83 in this order. The firstheat exchange unit 100 has therefrigerant flow channels 87 andwater flow channels 102. - In the
second plate 101, recessedportions 101A extending in the predetermined direction (the X-direction shown inFIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction. Thesecond plate 101 is disposed on thefirst plate 85 such that the recessedportions 101A face thefirst plate 85. - The
water flow channels 102 are defined by the top surface of thefirst plate 85 and the recessedportions 101A and function as water flow channels in which water flows. - The second
heat exchange unit 105 has a five-layered configuration in which afirst plate 106 and asecond plate 107 are alternately layered on thebase plate 83 in this order. The secondheat exchange unit 105 hasrefrigerant flow channels 108 andwater flow channels 109. - The
first plates 106 have configurations similar to those of thefirst plates 85 described above. Thefirst plates 106 are disposed on thebase plate 83 such that the plurality of recessedportions 85A face thebase plate 83. Therefrigerant flow channels 108 are defined by the top surface of thebase plate 83 and the recessedportions 85A, and the refrigerant flows therein. - In the
second plates 107, recessedportions 107A extending in the predetermined direction (the X-direction shown inFIG. 1 ) are disposed at predetermined intervals in the direction orthogonal to the predetermined direction. Each of thesecond plates 107 is disposed on thefirst plate 106 such that the recessedportions 107A face the top surface of thefirst plate 106. - The
water flow channels 109 are defined by the top surface of thefirst plate 106 and the recessedportions 107A, and water flows therein. - In the first and second
heat exchange units portions - In such a configuration, the total value of the cross-sectional areas of a plurality of
water flow channels 102 when cut along a plane orthogonal to the predetermined direction (the X-direction shown inFIG. 1 ) can be smaller than the total value of the cross-sectional areas of a plurality ofwater flow channels 109 when cut along a plane orthogonal to the predetermined direction (the X-direction shown inFIG. 1 ). - Accordingly, the flow rate of hot water (water) flowing in the plurality of
water flow channels 102 can be higher than the flow rate of water flowing inside the plurality ofwater flow channels 109. Therefore, it is possible to inhibit scale from growing inside thewater flow channels 109 of the firstheat exchange unit 100. -
FIG. 9 is a system diagram showing a schematic configuration of a water heating system according to a second embodiment of the present invention. InFIG. 9 , the same reference signs are applied to configuration parts the same as in thewater heating system 10 of the first embodiment shown inFIG. 1 . - With reference to
FIG. 9 , awater heating system 120 of the second embodiment has arefrigerant unit 121, awater circulation unit 122, and the hotwater storage unit 12. - The
refrigerant unit 121 has therefrigerant circulation line 15, theexpansion valve 17, thevaporizer 18, thecompressor 21, and afirst heat exchanger 125. - One end of the
refrigerant circulation line 15 is connected to one end of thefirst heat exchanger 125, and the other end thereof is connected to the other end of thefirst heat exchanger 125. - The
first heat exchanger 125 is configured to perform heat exchange between a refrigerant (for example, CO2) flowing in therefrigerant circulation line 15 and first water circulating inside thewater circulation unit 122 and is configured to turn the first water into first hot water. - The
water circulation unit 122 has awater circulation line 127, thevalves second heat exchanger 128, and apump 129. - The
water circulation line 127 is a line configured to be a closed loop and to cause the first water to circulate. Thewater circulation line 127 connects thefirst heat exchanger 125 and thesecond heat exchanger 128. Thewater circulation line 127 is configured to cause the first water to circulate in the first andsecond heat exchangers - As described above, when the
water circulation line 127 in which the first water circulates is caused to be the closed loop, water containing many hardness components such as calcium and magnesium is no longer supplied to thefirst heat exchanger 125 from outside of thewater heating system 120. Therefore, scale is inhibited from growing on a high-temperature side inside thefirst heat exchanger 125. Therefore, there is no need for thefirst heat exchanger 125 to be divided into a plurality of units as in theheat exchanger 23 described inFIG. 1 . - The
first heat exchanger 125 is a heat exchanger requiring a frequency of maintenance lower than that of thesecond heat exchanger 128. - The
valve 25 is provided in thewater circulation line 127 which is positioned on an exit side (a side from which the first hot water is guided out) of thesecond heat exchanger 128. Thevalve 26 is provided in thewater circulation line 127 which is positioned on an entrance side (a side into which the first water is guided) of thesecond heat exchanger 128. - The
second heat exchanger 128 has a configuration similar to that of theheat exchanger 23 shown inFIG. 1 . As the first and secondheat exchange units second heat exchanger 128, for example, it is possible to employ heat exchange units having the structures shown inFIGS. 2, 3 , and5 to 8 . - The
second heat exchanger 128 is connected to the water guide-inline 61 and the hot water guide-inline 66 configuring the hotwater storage unit 12. Accordingly, second water is supplied to thesecond heat exchanger 128 from the hotwater storage tank 56. - The
second heat exchanger 128 is configured to perform heat exchange between the first hot water guided out from thefirst heat exchanger 125 and the second water supplied via the water guide-inline 61 and is configured to turn the second water into second hot water. The second hot water is guided out from the firstheat exchange unit 31, and then, the second hot water is guided into the upper portion of the hotwater storage tank 56. - According to the
water heating system 120 of the second embodiment, when thesecond heat exchanger 128 divided into a plurality of units (in the case ofFIG. 9 , two) is provided outside therefrigerant unit 121, it is possible to easily perform maintenance of thesecond heat exchanger 128. - In addition, the
water heating system 120 of the second embodiment having the above-described configuration can attain an effect similar to that of thewater heating system 10 of the first embodiment. - In the second embodiment, as an example of the
second heat exchanger 128, descriptions are given of an exemplary case of being provided with theheat exchanger 23 shown inFIG. 1 . However, in place thereof, theheat exchanger 73 shown inFIG. 7 may be employed. - In the second embodiment, the
second heat exchanger 128 is acceptable as long as the heat exchangermain body 30 is divided into two or more parts. - Hereinabove, preferable embodiments of the present invention have been described in detail. The present invention is not limited to such particular embodiments, and various modifications and changes can be made within the scope of the gist of the present invention disclosed in claims.
- Hereinafter, experimental examples will be described. The present invention is not limited to the details of Examples 1 to 4 described in the experimental examples.
- In the experimental examples, an examination was carried out, under the conditions that a length L (= L1 + L2) of the heat exchanger
main body 30 in the X-direction before being divided as inFIG. 1 was set to 1, a flow rate S in the heat exchangermain body 30 before being divided was set to 1, and an entire pressure loss P in the heat exchangermain body 30 before being divided was set to 1 (Comparative Example), regarding the pressure loss of the first and secondheat exchange units heat exchange units heat exchange unit 32, when the lengths L1, L2 of the first and secondheat exchange units heat exchange unit 32 varied. In this case, the pressure loss was calculated with the flow rate which was squared and was proportional to the length. - In Examples 1 and 2, the length L1 of the first
heat exchange unit 31 was set to 0.5, and the length L2 of the secondheat exchange unit 32 was set to 0.5. In Example 3, the length L1 of the firstheat exchange unit 31 was set to 0.4, and the length L2 of the secondheat exchange unit 32 was set to 0.6. In Example 4, the length L1 of the firstheat exchange unit 31 was set to 0.3, and the length L2 of the secondheat exchange unit 32 was set to 0.7. - In addition, in Example 1, the flow rate of water flowing inside the second
heat exchange unit 32 was set to 0.8 (80% of the flow rate of water flowing inside the heat exchanger main body of Comparative Example). In Example 2, the flow rate of water flowing inside the secondheat exchange unit 32 was set to 0.7. In Example 3, the flow rate of water flowing inside the secondheat exchange unit 32 was set to 0.6. -
- With reference to Table 1, in Example 1, the flow rate in the first
heat exchange unit 31 was 1.5 times the flow rate in the secondheat exchange unit 32, and the total pressure loss was 1.04 being close to 1. According to the results, in Example 1, the flow rate in the firstheat exchange unit 31 was a sufficient flow rate, and the result for the total pressure loss was also an extremely satisfactory value. - In Example 2, although the result for the total pressure loss was a value slightly higher than that in Example 1, the flow rate in the first
heat exchange unit 31 was 3.0 times the flow rate in the secondheat exchange unit 32, and satisfactory results were achieved. - In Example 3, result for the total pressure loss was 1.0, which was a value slightly lower than that in Example 2. The flow rate in the first
heat exchange unit 31 was 2.33 times the flow rate in the secondheat exchange unit 32, and satisfactory results were achieved. - In Example 4, the flow rate in the first
heat exchange unit 31 was 3.0 times the flow rate in the secondheat exchange unit 32, and the total pressure loss was 0.85 being lower than 1. According to the results, in Example 4, the flow rate in the firstheat exchange unit 31 was a sufficient flow rate, and the result for the total pressure loss was also an extremely satisfactory value. - The length L1 of the first
heat exchange unit 31 in Example 4 was 0.3 times the length L of the heat exchangermain body 30. The location where scale precipitated was the firstheat exchange unit 31 in which the temperature of water rose to 60°C or higher. Depending on the conditions of the entrance water temperature and the exit water temperature, the ratio of the length being 0.3 times the length L of the heat exchangermain body 30 could be realized. - According to the results of Examples 1 to 4, it was ascertained that the flow rate in the first
heat exchange unit 31 can be sufficiently higher than (be 1.5 times or more than) the flow rate in the secondheat exchange unit 32 when the length L1 of the firstheat exchange unit 31 is equal to or shorter than 0.5 times the entire length including the length L2 of the secondheat exchange unit 32, in a case where the heat exchangermain body 30 is divided into two units. In other words, it was ascertained that scale can be inhibited from growing in the firstheat exchange unit 31. - In addition, according to the results of Examples 1 to 3, from the viewpoint of reducing the total pressure loss, it was possible to confirm that the flow rate of water flowing in the water flow channel of the first
heat exchange unit 31 preferably ranges from 1.5 times to 3.0 times the flow rate of water flowing in the water flow channel of the secondheat exchange unit 32. - While preferred embodiments of the invention have been described and shown above, it should be understood that these are exemplary of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the spirit or scope of the present invention. Accordingly, the invention is not to be considered as being limited by the foregoing description, and is only limited by the scope of the appended claims.
-
- 10, 70, 120 Water heating system
- 11, 71, 121 Refrigerant unit
- 12 Hot water storage unit
- 15 Refrigerant circulation line
- 17 Expansion valve
- 18 Vaporizer
- 21 Compressor
- 23, 73 Heat exchanger
- 23A One end
- 23B Other end
- 25, 26, 36, 37, 42, 43, 64, 65 Valve
- 30, 75 Heat exchanger main body
- 31, 81, 100 First heat exchange unit
- 32, 91, 105 Second heat exchange unit
- 35 First connection supply line
- 41 Second connection supply line
- 45, 51 Tube
- 46, 52 Plate
- 47, 53, 88, 96, 102, 109 Water flow channel
- 56 Hot water storage tank
- 58 Water supply line
- 61 Water guide-in line
- 63, 129 Pump
- 66 Hot water guide-in line
- 68 Hot water guide-out line
- 78 Third heat exchange unit
- 83 Base plate
- 85, 92, 106 First plate
- 85A, 86A, 93A, 96A, 101A Recessed portion
- 86, 93, 101, 107 Second plate
- 87, 95, 108 Refrigerant flow channel
- 122 Water circulation unit
- 125 First heat exchanger
- 127 Water circulation line
- 128 Second heat exchanger
- A, B, X Direction
- L1, L2 Length
- R1, R2 Diameter
Claims (8)
- A water heating system (10, 70) comprising:a refrigerant unit (11, 71) that includesa refrigerant circulation line (15) in which a refrigerant circulates,a vaporizer (18) which is provided in the refrigerant circulation line, is configured to vaporize the liquid refrigerant decompressed by an expansion valve (17), and is configured to generate refrigerant gas,a compressor (21) which is provided in the refrigerant circulation line, and is configured to compress the refrigerant gas guided out from the vaporizer, anda heat exchanger (23, 73) which is provided in the refrigerant circulation line, is configured to provide heat exchange between the refrigerant gas guided out from the compressor and water, and is configured to turn the water into hot water; anda hot water storage unit (12) that includesa hot water storage tank (56) which stores the hot water,a water guide-in line (61) which is configured to guide the water stored in a lower portion inside the hot water storage tank into the heat exchanger through one end of the heat exchanger (23A),a hot water guide-in line (66) which is connected to the other end of the heat exchanger (23B) and is configured to guide the hot water to an upper portion of the hot water storage tank, anda water supply line (58) which is configured to supply water from outside to the lower portion inside the hot water storage tank,wherein the heat exchanger has a plurality of heat exchange units (31, 32, 81, 91, 100, 105) which are separated from each other in a predetermined direction and are connected to each other in series,wherein the plurality of heat exchange units each include at least one water flow channel (47,53, 88, 96, 102, 109) in which the water flows,wherein the plurality of heat exchange units include at least a first heat exchange unit (31, 81, 100) configuring the other end of the heat exchanger, and a second heat exchange unit (32, 91, 105) being disposed in the vicinity of the first heat exchange unit in a direction in which the water flows, andwherein a total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the water flows is smaller than a total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the water flows.
- The water heating system (10, 70) according to claim 1,
wherein a diameter of the water flow channel of the first heat exchange unit (R1) is smaller than a diameter of the water flow channel of the second heat exchange unit (R2). - The water heating system according to claim 1 or 2,
wherein the number of water flow channels of the first heat exchange unit (47, 88, 102) is less than the number of water flow channels of the second heat exchange unit (53, 96, 109). - The water heating system (10, 70) according to any one of claims 1 to 3,
wherein the heat exchanger (23, 73) is divided into two units and is configured to include the first heat exchange unit (31, 81, 100)and the second heat exchange unit (32, 91, 105), and
wherein a flow rate of the water flowing in the water flow channel of the first heat exchange unit (47, 88, 102) ranges from 1.5 times to 3.0 times a flow rate of the water flowing in the water flow channel of the second heat exchange unit (53, 96, 109) . - The water heating system according to claim 4,
wherein a length (L1) of the first heat exchange unit in the predetermined direction is equal to or shorter than 0.5 times a length of the heat exchanger that is a sum total of a length (L2) of the second heat exchange unit in the predetermined direction and the length of the first heat exchange unit. - A water heating system (120) comprising:a refrigerant unit (121) that includesa refrigerant circulation line (15) in which a refrigerant circulates,a vaporizer (18) which is provided in the refrigerant circulation line, is configured to vaporize the liquid refrigerant decompressed by an expansion valve, and is configured to generate refrigerant gas,a compressor (21) which is provided in the refrigerant circulation line, and is configured to compress the refrigerant gas guided out from the vaporizer, anda first heat exchanger (125) which is provided in the refrigerant circulation line, is configured to perform heat exchange between the refrigerant gas guided out from the compressor and first water, and is configured to turn the first water into first hot water;a water circulation unit (122) that includesa water circulation line (127) which is configured to be a closed loop such that the first water circulates, and to cause the first water to circulate in the first heat exchanger, anda second heat exchanger (128) which is provided in the water circulation line, is configured to perform heat exchange between the first hot water and second water, and is configured to turn the second water into second hot water; anda hot water storage unit (12) that includesa hot water storage tank (56) which stores the second hot water,a water guide-in line (61) which is configured to guide the second water stored in a lower portion inside the hot water storage tank into the second heat exchanger through one end of the second heat exchanger,a hot water guide-in line (66) which is connected to an other end of the second heat exchanger (23B) and is configured to guide the second hot water to an upper portion inside the hot water storage tank, anda water supply line (58) which is configured to supply the second water from outside to the lower portion inside the hot water storage tank,wherein the second heat exchanger has a plurality of heat exchange units (31, 32) which are separated from each other in a predetermined direction and are connected to each other in series,wherein the plurality of heat exchange units each include at least one water flow channel (47, 53) in which the second water flows,wherein the plurality of heat exchange units include at least a first heat exchange unit (31) configuring the other end of the second heat exchanger, and a second heat exchange unit (32) being disposed in the vicinity of the first heat exchange unit in a direction in which the second water flows, andwherein a total cross-sectional area of the water flow channel of the first heat exchange unit cut along a plane orthogonal to the direction in which the second water flows is smaller than a total cross-sectional area of the water flow channel of the second heat exchange unit cut along a plane orthogonal to the direction in which the second water flows.
- The water heating system according to claim 6,
wherein a diameter (R1) of the water flow channel of the first heat exchange unit is smaller than a diameter (R2) of the water flow channel of the second heat exchange unit. - The water heating system according to claim 6 or 7,
wherein the number of water flow channels of the first heat exchange unit is less than the number of water flow channels of the second heat exchange unit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016197489A JP2018059670A (en) | 2016-10-05 | 2016-10-05 | Water heating system |
Publications (2)
Publication Number | Publication Date |
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EP3306221A2 true EP3306221A2 (en) | 2018-04-11 |
EP3306221A3 EP3306221A3 (en) | 2018-07-11 |
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ID=60019715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17194192.5A Withdrawn EP3306221A3 (en) | 2016-10-05 | 2017-09-29 | Water heating system |
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EP (1) | EP3306221A3 (en) |
JP (1) | JP2018059670A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4040069A4 (en) * | 2019-11-05 | 2022-12-07 | Daikin Industries, Ltd. | Hot water supply device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004144445A (en) | 2002-10-28 | 2004-05-20 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5194035B2 (en) * | 2010-01-04 | 2013-05-08 | 日立アプライアンス株式会社 | Heat pump water heater |
JP2011163631A (en) * | 2010-02-09 | 2011-08-25 | Hitachi Appliances Inc | Heat pump water heater |
JP5494770B2 (en) * | 2012-09-25 | 2014-05-21 | 三菱電機株式会社 | Heat pump water heater |
JP6239289B2 (en) * | 2013-07-11 | 2017-11-29 | 三菱重工サーマルシステムズ株式会社 | Heat pump hot water supply system |
-
2016
- 2016-10-05 JP JP2016197489A patent/JP2018059670A/en active Pending
-
2017
- 2017-09-29 EP EP17194192.5A patent/EP3306221A3/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2004144445A (en) | 2002-10-28 | 2004-05-20 | Matsushita Electric Ind Co Ltd | Heat pump water heater |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4040069A4 (en) * | 2019-11-05 | 2022-12-07 | Daikin Industries, Ltd. | Hot water supply device |
AU2020380978B2 (en) * | 2019-11-05 | 2023-06-08 | Daikin Industries, Ltd. | Hot water supply apparatus |
US11674695B2 (en) | 2019-11-05 | 2023-06-13 | Daikin Industries, Ltd. | Hot water supply apparatus |
Also Published As
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EP3306221A3 (en) | 2018-07-11 |
JP2018059670A (en) | 2018-04-12 |
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