EP3141824B1 - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
- Publication number
- EP3141824B1 EP3141824B1 EP14835685.0A EP14835685A EP3141824B1 EP 3141824 B1 EP3141824 B1 EP 3141824B1 EP 14835685 A EP14835685 A EP 14835685A EP 3141824 B1 EP3141824 B1 EP 3141824B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- refrigerant
- indoor machine
- air conditioning
- radiant
- pipe
- 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.)
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- 238000004378 air conditioning Methods 0.000 title claims description 46
- 239000003507 refrigerant Substances 0.000 claims description 159
- 238000010438 heat treatment Methods 0.000 description 44
- 238000001816 cooling Methods 0.000 description 17
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- 239000002023 wood Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
- F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0089—Systems using radiation from walls or panels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
- F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
- F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
- F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
- F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
- F28F1/20—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being attachable to the element
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0232—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with bypasses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/01—Geometry problems, e.g. for reducing size
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2215/00—Fins
- F28F2215/06—Hollow fins; fins with internal circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2275/00—Fastening; Joining
- F28F2275/08—Fastening; Joining by clamping or clipping
- F28F2275/085—Fastening; Joining by clamping or clipping with snap connection
Definitions
- the present invention relates to an air conditioning system, more specifically, it relates to an air conditioning system which includes a convective indoor machine and a radiant indoor machine to prevent damage to a compressor and lowering in reliability of the compressor.
- An air conditioner is generally used which has a compressor, an outdoor heat exchanger, an expansion valve, a convective indoor machine and a refrigerant piping connecting them.
- the air conditioner supplies cooled or heated air to an indoor space, at an air conditioning target space, by a fan and circulates or convects indoor air to perform air conditioning.
- air conditioning is performed by making refrigerant pass through a radiant indoor machine and cooling or heating air of the indoor space at an air conditioning target space.
- the convective air conditioning using the convective indoor machine is quick in startup time, however, is low in the degree of comfort due to bodily sensation of supplied air, so-called draft sensation.
- the radiant air conditioning using the radiant indoor machine has a disadvantage that startup time is long, however, has advantages that the degree of comfort on the human body is high, heating effect is excellent even if the temperature of indoor air is low, and heat loss is small.
- Patent Document 1 An air conditioning system, in which a radiant indoor machine is added to an air conditioner including a convective indoor machine, has already been proposed by the inventors in Patent Document 1. Further, Patent Document 2 discloses a humidity control method for an air conditioner which is capable of keeping room humidity appropriate in a cooling operation as well as preventing vapor condensation.
- the inventors repeated experiments for utilizing an air conditioning system in which a radiant indoor machine is added to an air conditioner including a convective indoor machine, and then found that an oil accumulation is caused at a lower part of the refrigerant pipe by meanderingly forming a refrigerant pipe of the radiant indoor machine (hereinafter, referred to as "meandering pipe”), the pipe including a plurality of vertically juxtaposed straight pipes and connection pipes connecting between upper ends of the adjacent straight pipes and between lower ends thereof.
- Refrigerant of the air conditioner is partially a two-phase refrigerant of gas and liquid and circulates in a refrigerant piping, the refrigerant contains lubricating oil of a compressor, and the oil accumulation is considered to be caused by separation of the lubricating oil in the refrigerant.
- the compressor runs short of lubricating oil and receives excess load, and thus, is a cause for a failure.
- the inventors in order to solve the problem, repeated their investigation on a radiant indoor machine, found that not reducing the flow speed of refrigerant flowing through the radiant indoor machine prevents oil accumulation from being caused, and accomplished the present invention.
- the present invention has been made in order to solve the above problem, and it is a first object of the invention to provide an air conditioning system which includes a convective indoor machine and a radiant indoor machine to prevent separation of lubricating oil in refrigerant and consequently prevent damage to a compressor, and can prevent a lowering in reliability of the compressor.
- the invention provides an air conditioning system as recited in claim 1.
- Advantageous embodiments are set out in the dependent claims.
- the air conditioning system includes: an air conditioner having at least: an outdoor machine having a compressor, an outdoor heat exchanger and an expansion valve; a convective indoor machine; and a refrigerant piping connecting them; and a radiant indoor machine which is arranged between the convective indoor machine and the outdoor machine and has a refrigerant pipe connecting between the convective indoor machine and the outdoor machine and having an inner diameter smaller than that of the refrigerant piping.
- the inner diameter and the length of the refrigerant pipe of the radiant indoor machine can be optionally set in a design range where the air conditioning system functions as described in the following descriptions and embodiments.
- the inner diameter of the refrigerant pipe is too small, the flow speed of refrigerant increases, however, pressure loss increases by resistance, the load of the compressor increases and efficiency is considered to deteriorate.
- the relationship between the inner diameter of the refrigerant piping of the air conditioner and that of the refrigerant pipe of the radiant indoor machine is specifically as follows.
- the radiant indoor machine in order to branch the refrigerant in a design range where the air conditioning system sufficiently functions, the radiant indoor machine, preferably, includes a branch part for branching a flow of refrigerant into a plurality of flows and a collecting part for collecting the refrigerant formed by the branching part.
- the refrigerant pipe of the radiant indoor machine includes a plurality of straight pipes vertically juxtaposed and connection pipes connecting between upper ends of the adjacent straight pipes and between lower ends thereof, and is meanderingly formed.
- the plurality of straight pipes each are covered with an oval heat radiating part having outer surfaces of opposite walls expanded outward, and the heat radiating parts may be arranged in the shape of a polygonal line so that ends of the adjacent heat radiating parts do not align.
- the radiant indoor machine is excellent in radiating performance of radiant heat. Accordingly, by arranging the heat radiating parts in the shape of a polygonal line, vertical convection of indoor air can be kept while keeping a necessary radiant heat radiating surface.
- the plurality of radiant indoor machines can be connected to a refrigerant circuit in series.
- an air conditioning system which includes a convective indoor machine and a radiant indoor machine to prevent separation of lubricating oil in refrigerant and consequently prevent damage to a compressor and can prevent lowering reliability of the compressor, since the inner diameter of a refrigerant pipe of the radiant indoor machine is made smaller than that of a refrigerant piping of an air conditioner.
- the radiant indoor machine includes a branching part for branching a flow of refrigerant flowing through the refrigerant pipe into a plurality of flows and a collecting part for collecting the refrigerant formed by the branching part
- decrease of the flow speed of the refrigerant in the refrigerant pipe can be prevented by branching the refrigerant pipe into a plurality of pipes even if the radiant indoor machine is upsized.
- an air conditioning system 100 is constituted by one outdoor machine 1 and two indoor machines connected to the outdoor machine 1 inserial.
- One of the two indoor machines is a general convective indoor machine 2, and the other is a radiant indoor machine 10.
- the convective indoor machine 2 and the radiant indoor machine 10 are installed in a room or the like having an air conditioning target space and have a function of cooling or heating the air conditioning target space.
- the convective indoor machine 2 and the radiant indoor machine 10 are communicatively connected by a refrigerant piping 7. Accordingly, the convective indoor machine 2 and the radiant indoor machine 10 of the air conditioning system 100 forms part of a refrigerant circuit, and cooling operation or heating operation can be performed by circulating refrigerant in the refrigerant circuit.
- the outdoor machine 1 includes a compressor 3, an outdoor heat exchanger 4 and an expansion valve 5, and the structure thereof is well known.
- the convective indoor machine 2 includes an indoor heat exchanger 6 and a blowing fan (not shown), and the structure thereof is well known.
- the indoor heat exchanger 6 serves as a vaporizer during cooling operation and as a condenser (radiator) during heating operation, performs thermal exchange between air supplied from a blower such as a fan (not shown) and refrigerant, and generates heating air or cooling air to be supplied to the air conditioning target space.
- a blower such as a fan (not shown) and refrigerant
- the above devices are connected via the refrigerant piping 7, and constitute part of a refrigerating cycle (refrigerant circuit) of the air conditioning system 100.
- the radiant indoor machine 10 is provided in the refrigerating cycle of the air conditioning system 100.
- the radiant indoor machine 10 includes a heating element 11 and a frame 12 for fixing and supporting the heating element 11.
- the frame 12 includes, at its both left-right sides, vertical frames 12a and 12b vertically erected in parallel.
- material of the frame 12 for example, wood, synthetic resin or metal such as aluminum can be employed.
- the frame 12 includes a reflector for reflecting radiant heat or a back plate as a heat insulator in the embodiment, it does not need to include the back plate.
- the heating element 11 is arranged between the vertical frames 12a and 12b.
- the heating element 11 is vertically arranged in its longitudinal direction, and has a refrigerant pipe 110 which has a plurality of horizontally juxtaposed straight pipes 112 and connection pipes 114 connecting between upper ends of the adjacent straight pipes and between lower ends thereof and is meanderingly formed as a whole. As shown in Fig. 3 , the heating element 11 is constituted in such a way that the straight pipe 112 of the refrigerant pipe 110 is surrounded by a heat radiation area enlarging member 111.
- the refrigerant pipe 110 can be made of metal such as aluminum or copper, or, if necessary, another material.
- the heating element 11 has, at its upper side, a branching part 113 for branching a flow of refrigerant flowing through the refrigerant piping 7 into two flows and a collecting part 115 for collecting the refrigerant formed by the branching part 113.
- a connection port of the branching part 113 and a connection port of the collecting part 115 are respectively connected to the refrigerant piping 7, and the radiant indoor machine 10 is incorporated in the refrigerant circuit.
- branching part 113 and the collecting part 115 are arranged at the upper side of the heating element 11 in the embodiment shown in Figs. 3 , 4 and 6 , not limited to this, for example, as shown in Fig. 11 (modified radiant indoor machine), the branching part 113 and the collecting part 115 may be arranged at a lower side of the heating element 11.
- the branching part 113 includes branch pipes 113a and 113b.
- a flow of refrigerant is branched into two flows by the branch pipes 113a and 113b.
- the arrow in Fig. 6 indicates the flow of refrigerant, one flow formed by the branch pipe 113a passes through the 6 straight pipes 112 shown in the right side of Fig. 6 (second heating element 11b), and the other flow formed by the branch pipe 113b passes through the 6 straight pipes 112 shown at the left side of Fig. 6 (first heating element 11a).
- the refrigerants converge at the collecting part 115, and the refrigerant flows from the collecting part 115 to the refrigerant circuit 7.
- arrows in Figs. 5 and 6 indicate the flow of refrigerant during heating.
- the reason for this setting is that, particularly during heating, when refrigerant flowing in the heating element 11 flows from the center side to the outer side (that is, the refrigerant flows from the branching part 113 side to the collecting part 115 side), heat is radiated more efficiently.
- the vertical frames 12a and 12b are provided in terms of safety or protection of the system (in particular, the heating element).
- refrigerant flowing in the heating element 11 may, during heating, flow from the outer side to the center side (that is, refrigerant flows from the collecting part 115 side to the branching part 113 side, during cooling, the refrigerant flows reversely).
- the lengths of the first heat heating elementlla and second heating elementllb are the same, about 6m. Additionally, the inner diameter, 4.75 ⁇ (17.7mm 2 ), of the straight pipe 112 is smaller than that, 7.92 ⁇ (49.2mm 2 ), of the refrigerant piping 7.
- the refrigerant piping having an inner diameter of 7.92 ⁇ (49.2mm 2 ) is branched into two systems by a two-system refrigerant pipe having an inner diameter of 4.75 ⁇ (17.7mm 2 ).
- the flow speed of refrigerant in the heating element 11 between the branching part 113 and the collecting part 115 is higher than that of refrigerant flowing in the refrigerant piping 7, and separation of lubricating oil in two-phase refrigerant can be prevented.
- each straight pipe 112 is surrounded by the oval heat radiation area enlarging member 111 having outer surfaces of opposite walls expanded outward.
- the heat radiation area enlarging member 111 is made of, for example, aluminum, and thus, the area of a heat radiation of the straight pipe 112 for performing thermal exchange in an indoor space is enlarged.
- the heat radiation area enlarging member 111 is constituted by two parts 111a and 111b between which the straight pipe 112 is sandwiched from both sides and which are connected by engagement of contact parts.
- the strength of pressure contact between the straight pipe 112 and the heat radiation area enlarging member 111 is set to the extent that the heat radiation area enlarging member 111 can rotate around the straight pipe 112. Thus, a direction of a heat radiating surface of the heat radiation area enlarging member 111 can be changed. Note that the member 111 does not need to rotate.
- a drain pan 116 which is a water collecting member formed in the shape of a gutter having an opened upper part, is arranged with both ends of the pan fixed between the vertical frames 12a and 12b.
- a drain pipe is connected to one end side of the bottom of the drain pan 116. Dew condensation water condensing on a surface of the heating element 11 drops on the drain pan 116, and is appropriately collected and discarded through the drain pipe.
- the reference numeral 117 denotes a screen decorative plate.
- a four-way valve 8 is switched so that refrigerant discharged from the compressor 3 flows into the outdoor heat exchanger 4, and the compressor 3 is driven.
- Refrigerant sucked into the compressor 3 is formed into high-pressure and high-temperature gas in the compressor 3 and discharged therefrom, and flows into the outdoor heat exchanger 4 via the four-way valve 8.
- the refrigerant flowing in the outdoor heat exchanger 4 is cooled while radiating heat to air supplied from the blower (not shown), becomes low-pressure and high-temperature liquid refrigerant, and flows out from the outdoor heat exchanger 4.
- the liquid refrigerant which has flowed out from the outdoor heat exchanger 4, flows into the convective indoor machine 2 through the expansion valve 5.
- the refrigerant flowing in the convective indoor machine 2 becomes two-phase refrigerant.
- the low-pressure two-phase refrigerant flows into the indoor heat exchanger 6, and vaporizes by absorbing heat from air supplied from the blower (not shown) to become gas.
- cooling air is supplied to the air conditioning target space such as an indoor space to realize cooling operation of the air conditioning target space.
- the two-phase refrigerant which has flowed out from the indoor heat exchanger 6, flows out from the convective indoor machine 2, flows into the radiant indoor machine 10 and passes through the refrigerant pipe 110. At this time, heat absorption action to the atmosphere and cooling of the atmosphere, that is air, of the air conditioning target space such as an indoor space is performed to realize cooling of the air conditioning target space.
- the refrigerant which has flowed out from the radiant indoor machine 10, flows into the outdoor machine 1, passes through the four-way valve 8 of the outdoor machine 1 and is sucked into the compressor 3 again.
- the cooling operation is performed by repeating the above refrigerant cycle.
- the four-way valve 83 is switched so that refrigerant discharged from the compressor 3 flows into the indoor heat exchanger 6, and the compressor 3 is driven. Refrigerant sucked into the compressor 3 is formed into high-pressure and high-temperature gas in the compressor 3 and discharged therefrom, and flows into the radiant indoor machine 10 via the four-way valve 8.
- the refrigerant flowing in the radiant indoor machine 10 radiates radiant heat from the refrigerant pipe 110 of the heating element 11 to heat the atmosphere of the air conditioning target space such as an indoor space.
- the refrigerant which has flowed out from the radiant indoor machine 10, flows into the indoor heat exchanger 6 of the convective indoor machine 2.
- the refrigerant flowing in the indoor heat exchanger 6 is cooled while radiating heat to air supplied from the blower (not shown) and becomes liquid refrigerant. At this time, heating air is supplied to the air conditioning target space such as an indoor space to realize heating operation of the air conditioning target space.
- the low-pressure two-phase refrigerant flows into the outdoor heat exchanger 4 of the outdoor machine 1.
- the low-pressure two-phase refrigerant flowed into the outdoor heat exchanger 4 vaporizes by absorbing heat from air supplied from the blower (not shown) to become gas.
- the low-pressure gas refrigerant flows out from the outdoor heat exchanger 4, passes through the four-way valve 8 and is sucked into the compressor 3 again.
- Heating operation is performed by repeating the above refrigerant cycle.
- first, second and the like mean neither grade nor priority, and are used for distinguishing one element from the other elements.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Geometry (AREA)
- Other Air-Conditioning Systems (AREA)
- Air Conditioning Control Device (AREA)
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Description
- The present invention relates to an air conditioning system, more specifically, it relates to an air conditioning system which includes a convective indoor machine and a radiant indoor machine to prevent damage to a compressor and lowering in reliability of the compressor.
- An air conditioner is generally used which has a compressor, an outdoor heat exchanger, an expansion valve, a convective indoor machine and a refrigerant piping connecting them. The air conditioner supplies cooled or heated air to an indoor space, at an air conditioning target space, by a fan and circulates or convects indoor air to perform air conditioning.
- Additionally, air conditioning is performed by making refrigerant pass through a radiant indoor machine and cooling or heating air of the indoor space at an air conditioning target space.
- The convective air conditioning using the convective indoor machine is quick in startup time, however, is low in the degree of comfort due to bodily sensation of supplied air, so-called draft sensation.
- On the other hand, the radiant air conditioning using the radiant indoor machine has a disadvantage that startup time is long, however, has advantages that the degree of comfort on the human body is high, heating effect is excellent even if the temperature of indoor air is low, and heat loss is small.
- Accordingly, if the convective air conditioning and the radiant air conditioning are used together, the advantage of one overcomes the disadvantage of the other, and comfortable and ideal air conditioning can be realized.
- An air conditioning system, in which a radiant indoor machine is added to an air conditioner including a convective indoor machine, has already been proposed by the inventors in
Patent Document 1. Further,Patent Document 2 discloses a humidity control method for an air conditioner which is capable of keeping room humidity appropriate in a cooling operation as well as preventing vapor condensation. -
- Patent Document 1: Patent No.
5285179 - Patent Document 2: Japanese Patent Application No.
JP S63 185023 U - The inventors repeated experiments for utilizing an air conditioning system in which a radiant indoor machine is added to an air conditioner including a convective indoor machine, and then found that an oil accumulation is caused at a lower part of the refrigerant pipe by meanderingly forming a refrigerant pipe of the radiant indoor machine (hereinafter, referred to as "meandering pipe"), the pipe including a plurality of vertically juxtaposed straight pipes and connection pipes connecting between upper ends of the adjacent straight pipes and between lower ends thereof.
- Refrigerant of the air conditioner is partially a two-phase refrigerant of gas and liquid and circulates in a refrigerant piping, the refrigerant contains lubricating oil of a compressor, and the oil accumulation is considered to be caused by separation of the lubricating oil in the refrigerant. When the lubricating oil is separated and lost from the refrigerant, the compressor runs short of lubricating oil and receives excess load, and thus, is a cause for a failure.
- The cause of separation of lubricating oil in refrigerant is not clear, however, it is thought as follows. That is, when the radiant indoor machine is added to the air conditioner including the convective indoor machine, it is considered to be the same as when the refrigerant piping is lengthened. In the given design no consideration is made for the radiant indoor machine which results in lack of capacity of the compressor, reducing the flow speed of the refrigerant, and thus, the oil accumulation is considered to be caused at the lower part of the refrigerant pipe of the radiant indoor machine.
- Although it is considered that this problem can be solved by enhancing the capacity of the compressor, it is difficult, in terms of cost, to exchange the existing compressor for a compressor having higher capacity in the case of adding a radiant indoor machine to the existing air conditioner. Additionally, in the case of newly manufacturing an air conditioner, enhancing the capacity of a compressor in consideration of preparation of a radiant indoor machine which is not always used, results in increasing cost.
- The inventors, in order to solve the problem, repeated their investigation on a radiant indoor machine, found that not reducing the flow speed of refrigerant flowing through the radiant indoor machine prevents oil accumulation from being caused, and accomplished the present invention.
- The present invention has been made in order to solve the above problem, and it is a first object of the invention to provide an air conditioning system which includes a convective indoor machine and a radiant indoor machine to prevent separation of lubricating oil in refrigerant and consequently prevent damage to a compressor, and can prevent a lowering in reliability of the compressor.
- In addition to the first object, it is a second object of the invention to provide an air conditioning system which prevents the flow speed of the refrigerant from decreasing even if the radiant indoor machine is upsized.
- The means taken by the present invention to solve the above problem are as follows.
- The invention provides an air conditioning system as recited in
claim 1. Advantageous embodiments are set out in the dependent claims. - The air conditioning system includes: an air conditioner having at least: an outdoor machine having a compressor, an outdoor heat exchanger and an expansion valve; a convective indoor machine; and a refrigerant piping connecting them; and a radiant indoor machine which is arranged between the convective indoor machine and the outdoor machine and has a refrigerant pipe connecting between the convective indoor machine and the outdoor machine and having an inner diameter smaller than that of the refrigerant piping.
- The inner diameter and the length of the refrigerant pipe of the radiant indoor machine can be optionally set in a design range where the air conditioning system functions as described in the following descriptions and embodiments. When the inner diameter of the refrigerant pipe is too small, the flow speed of refrigerant increases, however, pressure loss increases by resistance, the load of the compressor increases and efficiency is considered to deteriorate.
- The relationship between the inner diameter of the refrigerant piping of the air conditioner and that of the refrigerant pipe of the radiant indoor machine is specifically as follows.
- (1) For example, refrigerant flowing in a refrigerant piping [inner diameter: 7.92ϕ (49.2mm2)] of the air conditioner is branched into two systems by a meandering two-system refrigerant pipe [inner diameter: 4.75ϕ (17.7mm2)] of a radiant indoor machine. Straight pipe parts of the meandering pipe are vertically arranged.
The total cross-sectional area (35.4mm2) of the refrigerant pipe having an inner diameter of 4.75ϕ (17.7mm2) is about 72% of that of the refrigerant piping having an inner diameter of 7.92ϕ (49.2mm2), the inner diameter of the refrigerant pipe is smaller than that of the refrigerant piping, and therefore the flow speed of the refrigerant flowing in the refrigerant pipe increases.
A of the radiant indoor machine including the refrigerant pipe has 12 heat radiation plates for one unit (two-system meandering pipe having 6 plates per one system) as a reference unit of one radiant indoor machine. Note that the above experiments were performed by using the reference unit. - (2) For example, refrigerant flowing in a refrigerant piping [inner diameter: 11.1ϕ (96.7mm2)] of the air conditioner is branched into two systems by a meandering two-system refrigerant pipe [inner diameter: 7.92ϕ (49.2mm2)] of a radiant indoor machine. Straight pipe parts of the meandering pipe are vertically arranged.
The total cross-sectional area (98.4mm2) of the refrigerant pipe having an inner diameter of 7.92ϕ (49.2mm2) is about 101.7% of that of the refrigerant piping having an inner diameter of 11.1ϕ (96.7mm2), and the flow speeds of the refrigerants flowing in the pipe and the piping become approximately the same. - (3) For example, refrigerant flowing in a refrigerant piping [inner diameter: 13.88ϕ (151.2mm2)] of the air conditioner is branched into two systems by a meandering two-system refrigerant pipe [inner diameter: 6.4ϕ (32.2mm2)] of a radiant indoor machine. Straight pipe parts of the meandering pipe are vertically arranged. If two two-system meandering pipes are juxtaposed into four systems (two radiant indoor machines), the total cross-sectional area (128.8mm2) of the refrigerant pipe having an inner diameter of 6.4ϕ (32.2mm2) is about 85.1% of that of the refrigerant piping having an inner diameter of 13.88ϕ (151.2mm2) and the flow speed increases.
- The larger the radiant indoor machine becomes, the longer the refrigerant pipe becomes. Since refrigerant moves to an outlet while slowly radiating heat from the vicinity of an inlet of the refrigerant pipe, a temperature difference between the vicinities of the inlet and the outlet is caused and there is a possibility that the capacity of a heating element of the radiant indoor machine is not sufficiently shown. That is, temperature unevenness of the heating element causes heat radiation capacity of the heating element to be insufficiently shown. Additionally, the flow speed of the refrigerant decreases, and oil accumulation is caused.
- Accordingly, in order to branch the refrigerant in a design range where the air conditioning system sufficiently functions, the radiant indoor machine, preferably, includes a branch part for branching a flow of refrigerant into a plurality of flows and a collecting part for collecting the refrigerant formed by the branching part.
- Additionally, when the inner diameter of the refrigerant pipe is made small in a design range where the air conditioning system functions, and when a plurality of radiant indoor machines are provided, heat efficiency of the radiant indoor machines as a whole can be raised.
- In terms of smoothness of a flow of refrigerant, it is preferable that the refrigerant pipe of the radiant indoor machine includes a plurality of straight pipes vertically juxtaposed and connection pipes connecting between upper ends of the adjacent straight pipes and between lower ends thereof, and is meanderingly formed.
- The plurality of straight pipes each are covered with an oval heat radiating part having outer surfaces of opposite walls expanded outward, and the heat radiating parts may be arranged in the shape of a polygonal line so that ends of the adjacent heat radiating parts do not align.
- According to the experiments, when expansion parts of the heat radiating parts are arranged opposite to each other, a vertical temperature difference of the radiant indoor machine increases. The reason for this is considered that air is made to be heated or cooled by arranging the expansion parts of the heat radiating parts opposite to each other.
- Additionally, when the expansion parts of the heat radiating parts are horizontally aligned, the radiant indoor machine is excellent in radiating performance of radiant heat. Accordingly, by arranging the heat radiating parts in the shape of a polygonal line, vertical convection of indoor air can be kept while keeping a necessary radiant heat radiating surface.
- Since frost or ice is deposited on the outdoor heat exchanger in winter and decreases in operation capacity, the exchanger is periodically subjected to defrosting operation. Compared with providing no radiant indoor machine, the number of times of defrosting operation is considered to be reduced by providing a radiant indoor machine. The reason for the reduction is not clear, however, it is considered that, by providing the radiant indoor machine, efficiency of condensation and vaporization of the refrigerant is improved, the load to the compressor is reduced and frost is hardly deposited on the outdoor heat exchanger.
- By reducing the number of times of defrosting operation, energy is saved. Additionally, lowering of the temperature on the indoor side in the defrosting operation can be prevented.
- When the compressor is high in capacity, the plurality of radiant indoor machines can be connected to a refrigerant circuit in series.
- As another method, other than constituting a refrigerant circuit which makes all of the refrigerant pass through a radiant indoor machine, if a channel is secured through which part of refrigerant flows to the outdoor machine and the convective indoor machine without flowing through the radiant indoor machine, the radiant indoor machine is prevented from causing pressure loss of the refrigerant, and the compressor can be operated with no load.
- (Actions) Since the inner diameter of the refrigerant pipe of the radiant indoor machine is made smaller than that of the refrigerant piping of the air conditioner in the air conditioning system including the convective indoor machine and the radiant indoor machine, decrease of the flow speed of refrigerant flowing through the refrigerant pipe is prevented and oil accumulation can be prevented from being caused in the refrigerant pipe of the radiant indoor machine.
- According to the present invention, an air conditioning system can be provided which includes a convective indoor machine and a radiant indoor machine to prevent separation of lubricating oil in refrigerant and consequently prevent damage to a compressor and can prevent lowering reliability of the compressor, since the inner diameter of a refrigerant pipe of the radiant indoor machine is made smaller than that of a refrigerant piping of an air conditioner.
- Additionally, in the case where the radiant indoor machine includes a branching part for branching a flow of refrigerant flowing through the refrigerant pipe into a plurality of flows and a collecting part for collecting the refrigerant formed by the branching part, decrease of the flow speed of the refrigerant in the refrigerant pipe can be prevented by branching the refrigerant pipe into a plurality of pipes even if the radiant indoor machine is upsized.
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Fig. 1 is a schematic explanatory view of an air conditioning system according to an embodiment. -
Fig. 2 is a refrigerant circuit diagram of the air conditioning system shown inFig. 1 . -
Fig. 3 is a schematic explanatory view of a radiant indoor machine of which a screen decorative plate of an upper part is partially omitted. -
Fig. 4 is a schematic explanatory view in the case where the machine is viewed in the A-A direction shown inFig. 3 . -
Fig. 5 is a plan schematic explanatory view showing the structure of a refrigerant pipe of the radiant indoor machine, and showing the flow of refrigerant during heating by an arrow. -
Fig. 6 is a front schematic explanatory view showing the structure of the refrigerant pipe of the radiant indoor machine shown inFig. 5 , and showing the flow of refrigerant during heating by an arrow. -
Fig. 7 is a schematic explanatory view in the case where the machine shown inFig. 3 is viewed from above. -
Fig. 8 is a schematic cross-sectional explanatory view showing a relationship between a straight pipe and a heat radiation area enlarging member. -
Fig. 9 is a plan schematic explanatory view showing the structure of the refrigerant pipe of the radiant indoor machine, and showing the flow of refrigerant during cooling by an arrow. -
Fig. 10 is a front schematic explanatory view showing the structure of the refrigerant pipe of the radiant indoor machine shown inFig. 9 , and showing the flow of refrigerant during cooling by an arrow. -
Fig. 11 is a front schematic explanatory view showing the structure of a refrigerant pipe of a modified radiant indoor machine of the present invention. - The present invention will be described in detail based on embodiments shown in the drawings. Note that the symbols of the drawings are attached in order to avoid complexity and make for easier understanding.
- As shown in
Fig. 1 , anair conditioning system 100 is constituted by oneoutdoor machine 1 and two indoor machines connected to theoutdoor machine 1 inserial. One of the two indoor machines is a general convectiveindoor machine 2, and the other is a radiantindoor machine 10. - The convective
indoor machine 2 and the radiantindoor machine 10 are installed in a room or the like having an air conditioning target space and have a function of cooling or heating the air conditioning target space. - The convective
indoor machine 2 and the radiantindoor machine 10 are communicatively connected by arefrigerant piping 7. Accordingly, the convectiveindoor machine 2 and the radiantindoor machine 10 of theair conditioning system 100 forms part of a refrigerant circuit, and cooling operation or heating operation can be performed by circulating refrigerant in the refrigerant circuit. - Note that, although one outdoor machine, one convective
indoor machine 2 and one radiantindoor machine 10 are shown inFigs. 1 and2 , the number of each of the machines is not limited to the number shown in the figures. - As shown in
Fig. 2 , theoutdoor machine 1 includes acompressor 3, anoutdoor heat exchanger 4 and anexpansion valve 5, and the structure thereof is well known. Additionally, the convectiveindoor machine 2 includes anindoor heat exchanger 6 and a blowing fan (not shown), and the structure thereof is well known. - The
indoor heat exchanger 6 serves as a vaporizer during cooling operation and as a condenser (radiator) during heating operation, performs thermal exchange between air supplied from a blower such as a fan (not shown) and refrigerant, and generates heating air or cooling air to be supplied to the air conditioning target space. - The above devices are connected via the
refrigerant piping 7, and constitute part of a refrigerating cycle (refrigerant circuit) of theair conditioning system 100. - The radiant
indoor machine 10 is provided in the refrigerating cycle of theair conditioning system 100. - The radiant
indoor machine 10 includes aheating element 11 and aframe 12 for fixing and supporting theheating element 11. Theframe 12 includes, at its both left-right sides,vertical frames frame 12, for example, wood, synthetic resin or metal such as aluminum can be employed. - Although the
frame 12 includes a reflector for reflecting radiant heat or a back plate as a heat insulator in the embodiment, it does not need to include the back plate. - The
heating element 11 is arranged between thevertical frames - The
heating element 11 is vertically arranged in its longitudinal direction, and has arefrigerant pipe 110 which has a plurality of horizontally juxtaposedstraight pipes 112 andconnection pipes 114 connecting between upper ends of the adjacent straight pipes and between lower ends thereof and is meanderingly formed as a whole. As shown inFig. 3 , theheating element 11 is constituted in such a way that thestraight pipe 112 of therefrigerant pipe 110 is surrounded by a heat radiationarea enlarging member 111. - The
refrigerant pipe 110 can be made of metal such as aluminum or copper, or, if necessary, another material. - In the embodiment, the
heating element 11 has, at its upper side, a branchingpart 113 for branching a flow of refrigerant flowing through therefrigerant piping 7 into two flows and a collectingpart 115 for collecting the refrigerant formed by the branchingpart 113. A connection port of the branchingpart 113 and a connection port of the collectingpart 115 are respectively connected to therefrigerant piping 7, and the radiantindoor machine 10 is incorporated in the refrigerant circuit. - Note that, although the branching
part 113 and the collectingpart 115 are arranged at the upper side of theheating element 11 in the embodiment shown inFigs. 3 ,4 and6 , not limited to this, for example, as shown inFig. 11 (modified radiant indoor machine), the branchingpart 113 and the collectingpart 115 may be arranged at a lower side of theheating element 11. - The branching
part 113 includesbranch pipes branch pipes Fig. 6 indicates the flow of refrigerant, one flow formed by thebranch pipe 113a passes through the 6straight pipes 112 shown in the right side ofFig. 6 (second heating element 11b), and the other flow formed by thebranch pipe 113b passes through the 6straight pipes 112 shown at the left side ofFig. 6 (first heating element 11a). The refrigerants converge at the collectingpart 115, and the refrigerant flows from the collectingpart 115 to therefrigerant circuit 7. - Note that the arrows in
Figs. 5 and6 indicate the flow of refrigerant during heating. - On the other hand, as shown in
Figs. 9 and10 , the flow of refrigerant during cooling is opposite to that during heating (reverse direction of the arrow). - The reason for this setting is that, particularly during heating, when refrigerant flowing in the
heating element 11 flows from the center side to the outer side (that is, the refrigerant flows from the branchingpart 113 side to the collectingpart 115 side), heat is radiated more efficiently. - The reason for this is as follows. That is, although, during heating, refrigerant in the vicinity of an inlet is highest in temperature and the temperature slowly lowers by heat radiation as an outlet approaches, when the inlet of refrigerant is positioned outside the heating element 11 (the refrigerant flows in from the collecting
part 115 side), heat is shielded by thevertical frames indoor machine 10 of the embodiment and it is difficult to say that heat is radiated most efficiently. - On the other hand, when the inlet of refrigerant is positioned at the center side of the
heating element 11, there exists no obstruction for obstructing heat radiation such as thevertical frame - In the embodiment, in terms of safety or protection of the system (in particular, the heating element), the
vertical frames vertical frames vertical frames heating element 11 may, during heating, flow from the outer side to the center side (that is, refrigerant flows from the collectingpart 115 side to the branchingpart 113 side, during cooling, the refrigerant flows reversely). - In the embodiment, the lengths of the first heat heating elementlla and second heating elementllb are the same, about 6m. Additionally, the inner diameter, 4.75ϕ (17.7mm2), of the
straight pipe 112 is smaller than that, 7.92ϕ (49.2mm2), of therefrigerant piping 7. - The refrigerant piping having an inner diameter of 7.92ϕ (49.2mm2) is branched into two systems by a two-system refrigerant pipe having an inner diameter of 4.75ϕ (17.7mm2). Thus, the flow speed of refrigerant in the
heating element 11 between the branchingpart 113 and the collectingpart 115 is higher than that of refrigerant flowing in therefrigerant piping 7, and separation of lubricating oil in two-phase refrigerant can be prevented. - As shown in
Fig. 8 , eachstraight pipe 112 is surrounded by the oval heat radiationarea enlarging member 111 having outer surfaces of opposite walls expanded outward. The heat radiationarea enlarging member 111 is made of, for example, aluminum, and thus, the area of a heat radiation of thestraight pipe 112 for performing thermal exchange in an indoor space is enlarged. - The heat radiation
area enlarging member 111 is constituted by twoparts straight pipe 112 is sandwiched from both sides and which are connected by engagement of contact parts. - Additionally, the strength of pressure contact between the
straight pipe 112 and the heat radiationarea enlarging member 111 is set to the extent that the heat radiationarea enlarging member 111 can rotate around thestraight pipe 112. Thus, a direction of a heat radiating surface of the heat radiationarea enlarging member 111 can be changed. Note that themember 111 does not need to rotate. - As shown in
Figs. 3 and4 , at the lower side of theheating element 11, adrain pan 116, which is a water collecting member formed in the shape of a gutter having an opened upper part, is arranged with both ends of the pan fixed between thevertical frames drain pan 116. Dew condensation water condensing on a surface of theheating element 11 drops on thedrain pan 116, and is appropriately collected and discarded through the drain pipe. Thereference numeral 117 denotes a screen decorative plate. - The flow of refrigerant during each operation of the
air conditioning system 100 will be described with reference toFigs. 1 and2 . - When the
air conditioning system 100 performs cooling operation, a four-way valve 8 is switched so that refrigerant discharged from thecompressor 3 flows into theoutdoor heat exchanger 4, and thecompressor 3 is driven. - Refrigerant sucked into the
compressor 3 is formed into high-pressure and high-temperature gas in thecompressor 3 and discharged therefrom, and flows into theoutdoor heat exchanger 4 via the four-way valve 8. The refrigerant flowing in theoutdoor heat exchanger 4 is cooled while radiating heat to air supplied from the blower (not shown), becomes low-pressure and high-temperature liquid refrigerant, and flows out from theoutdoor heat exchanger 4. - The liquid refrigerant, which has flowed out from the
outdoor heat exchanger 4, flows into the convectiveindoor machine 2 through theexpansion valve 5. The refrigerant flowing in the convectiveindoor machine 2 becomes two-phase refrigerant. The low-pressure two-phase refrigerant flows into theindoor heat exchanger 6, and vaporizes by absorbing heat from air supplied from the blower (not shown) to become gas. At this time, cooling air is supplied to the air conditioning target space such as an indoor space to realize cooling operation of the air conditioning target space. - The two-phase refrigerant, which has flowed out from the
indoor heat exchanger 6, flows out from the convectiveindoor machine 2, flows into the radiantindoor machine 10 and passes through therefrigerant pipe 110. At this time, heat absorption action to the atmosphere and cooling of the atmosphere, that is air, of the air conditioning target space such as an indoor space is performed to realize cooling of the air conditioning target space. - The refrigerant, which has flowed out from the radiant
indoor machine 10, flows into theoutdoor machine 1, passes through the four-way valve 8 of theoutdoor machine 1 and is sucked into thecompressor 3 again. - The cooling operation is performed by repeating the above refrigerant cycle.
- When the
air conditioning system 100 performs heating operation, the four-way valve 83 is switched so that refrigerant discharged from thecompressor 3 flows into theindoor heat exchanger 6, and thecompressor 3 is driven. Refrigerant sucked into thecompressor 3 is formed into high-pressure and high-temperature gas in thecompressor 3 and discharged therefrom, and flows into the radiantindoor machine 10 via the four-way valve 8. - The refrigerant flowing in the radiant
indoor machine 10 radiates radiant heat from therefrigerant pipe 110 of theheating element 11 to heat the atmosphere of the air conditioning target space such as an indoor space. The refrigerant, which has flowed out from the radiantindoor machine 10, flows into theindoor heat exchanger 6 of the convectiveindoor machine 2. The refrigerant flowing in theindoor heat exchanger 6 is cooled while radiating heat to air supplied from the blower (not shown) and becomes liquid refrigerant. At this time, heating air is supplied to the air conditioning target space such as an indoor space to realize heating operation of the air conditioning target space. - The liquid refrigerant, which has flowed out from the
indoor heat exchanger 6, is decompressed by theexpansion valve 5 and becomes low-pressure two-phase refrigerant. The low-pressure two-phase refrigerant flows into theoutdoor heat exchanger 4 of theoutdoor machine 1. The low-pressure two-phase refrigerant flowed into theoutdoor heat exchanger 4 vaporizes by absorbing heat from air supplied from the blower (not shown) to become gas. The low-pressure gas refrigerant flows out from theoutdoor heat exchanger 4, passes through the four-way valve 8 and is sucked into thecompressor 3 again. - Heating operation is performed by repeating the above refrigerant cycle.
- Note that, the terms and expressions used in the present specification are merely descriptive, are not restrictive by any means, and not intended to exclude terms and expressions equivalent to the features and portions thereof described in the present specification. Also, various modifications are possible within the scope of the pending claims.
- Additionally, the terms, first, second and the like, mean neither grade nor priority, and are used for distinguishing one element from the other elements.
- 1: outdoor machine, 2: convective indoor machine, 3: compressor, 4: outdoor heat exchanger, 5: expansion valve, 6: indoor heat exchanger, 7: refrigerant piping, 8: four-way valve, 10: radiant indoor machine, 11: heating element, 12: frame, 100: air conditioning system, 110: refrigerant pipe, 111: heat radiation area enlarging member, 112: straight pipe, 113: branching part, 115: collecting part
Claims (3)
- An air conditioning system (100) comprising:an air conditioner having at least: an outdoor machine (1) having a compressor (3), an outdoor heat exchanger (4) and an expansion valve (5); a convective indoor machine (2); and a refrigerant piping (7) connecting them; anda radiant indoor machine (10) which is arranged between the convective indoor machine (2) and the outdoor machine (1) and has a refrigerant pipe (110) connecting between the convective indoor machine (2) and the outdoor machine (1) and having an inner diameter smaller than that of the refrigerant piping (7);wherein the refrigerant pipe (110) of the radiant indoor machine (10) includes a plurality of vertically juxtaposed straight pipes (112) and connection pipes (114) connecting between upper ends of the adjacent straight pipes (112) and between lower ends thereof, and is meanderingly formed;
wherein the plurality of straight pipes (112) each are covered with a heat radiating part (111);
characterized in that the heat radiating part (111) has an oval shape and is constituted by two parts sandwiching the straight pipe (112) from both sides, and the two parts are connected by engagement of contact parts by pressure contact to the straight pipe (112), wherein the strength of pressure contact is set to the extent that the heat radiating part (111) can rotate around the straight pipe (112). - The air conditioning system (100) according to claim 1, wherein the radiant indoor machine (10) includes a branching part (113) for branching a flow of refrigerant flowing through the refrigerant pipe (110) into a plurality of flows and a collecting part (115) for collecting the refrigerant formed by the branching part (113).
- The air conditioning system according to claim 1 or 2, wherein the heat radiating parts are arranged in the shape of a polygonal line so that ends of the adjacent heat radiating parts do not align.
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JP2014097916 | 2014-05-09 | ||
PCT/JP2014/084498 WO2015170431A1 (en) | 2014-05-09 | 2014-12-26 | Air conditioning system |
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EP3141824A1 EP3141824A1 (en) | 2017-03-15 |
EP3141824A4 EP3141824A4 (en) | 2017-12-27 |
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EP (1) | EP3141824B1 (en) |
JP (1) | JP6304783B2 (en) |
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- 2014-12-26 SG SG11201501227WA patent/SG11201501227WA/en unknown
- 2014-12-26 EP EP14835685.0A patent/EP3141824B1/en active Active
- 2014-12-26 MY MYPI2015700312A patent/MY184976A/en unknown
- 2014-12-26 CN CN201480002160.8A patent/CN105264296A/en active Pending
- 2014-12-26 JP JP2016517798A patent/JP6304783B2/en active Active
- 2014-12-26 AU AU2014393532A patent/AU2014393532B2/en active Active
- 2014-12-26 US US14/419,526 patent/US20160047577A1/en not_active Abandoned
-
2015
- 2015-02-20 PH PH12015500378A patent/PH12015500378A1/en unknown
-
2016
- 2016-06-14 HK HK16106808.1A patent/HK1218949A1/en unknown
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP3141824A1 (en) | 2017-03-15 |
EP3141824A4 (en) | 2017-12-27 |
WO2015170431A1 (en) | 2015-11-12 |
HK1218949A1 (en) | 2017-03-17 |
MY184976A (en) | 2021-04-30 |
JPWO2015170431A1 (en) | 2017-05-25 |
SG11201501227WA (en) | 2015-12-30 |
AU2014393532A1 (en) | 2017-01-05 |
US20160047577A1 (en) | 2016-02-18 |
AU2014393532B2 (en) | 2018-09-27 |
PH12015500378B1 (en) | 2015-09-28 |
JP6304783B2 (en) | 2018-04-04 |
PH12015500378A1 (en) | 2015-09-28 |
CN105264296A (en) | 2016-01-20 |
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