US20160047577A1 - Air conditioning system - Google Patents

Air conditioning system Download PDF

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Publication number
US20160047577A1
US20160047577A1 US14/419,526 US201414419526A US2016047577A1 US 20160047577 A1 US20160047577 A1 US 20160047577A1 US 201414419526 A US201414419526 A US 201414419526A US 2016047577 A1 US2016047577 A1 US 2016047577A1
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Prior art keywords
refrigerant
indoor machine
air conditioning
radiant
conditioning system
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Abandoned
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US14/419,526
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English (en)
Inventor
Takanobu Murakami
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Eco Factory Co Ltd
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Eco Factory Co Ltd
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Assigned to ECO FACTORY CO., LTD. reassignment ECO FACTORY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MURAKAMI, TAKANOBU
Publication of US20160047577A1 publication Critical patent/US20160047577A1/en
Abandoned legal-status Critical Current

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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 that is 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 that is an air conditioning target space.
  • the convective air conditioning using the convective indoor machine is quick in startup time. However, it 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 in that startup time is long.
  • it has advantages in 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.
  • Patent Document 1 U.S. Pat. No. 5,285,179
  • the inventor 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 when a refrigerant pipe of the radiant indoor machine is meanderingly formed (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, which is a cause for a failure.
  • the inventor in order to solve the problem, repeated 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.
  • An air conditioning system of the present invention 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.
  • pressure loss due to resistance increases, 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.
  • refrigerant flowing in a refrigerant piping [inner diameter: 7.92 ⁇ (49.2 mm 2 )] of the air conditioner is branched into two systems by a meandering two-system refrigerant pipe [inner diameter: 4.75 ⁇ (17.7 mm 2 )] of a radiant indoor machine.
  • Straight pipe parts of the meandering pipe are vertically arranged.
  • the total cross-sectional area (35.4 mm 2 ) of the refrigerant pipe having an inner diameter of 4.75 ⁇ (17.7 mm 2 ) is about 72% of that of the refrigerant piping having an inner diameter of 7.92 ⁇ (49.2 mm 2 ), 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 heating element 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.
  • refrigerant flowing in a refrigerant piping [inner diameter: 11.1 ⁇ (96.7 mm 2 )] of the air conditioner is branched into two systems by a meandering two-system refrigerant pipe [inner diameter: 7.92 ⁇ (49.2 mm 2 )] of a radiant indoor machine.
  • Straight pipe parts of the meandering pipe are vertically arranged.
  • the total cross-sectional area (98.4 mm 2 ) of the refrigerant pipe having an inner diameter of 7.92 ⁇ (49.2 mm 2 ) is about 101.7% of that of the refrigerant piping having an inner diameter of 11.1 ⁇ (96.7 mm 2 ), and the flow speeds of the refrigerants flowing in the pipe and the piping become approximately the same.
  • refrigerant flowing in a refrigerant piping [inner diameter: 13.88 ⁇ (151.2 mm 2 )] of the air conditioner is branched into two systems by a meandering two-system refrigerant pipe [inner diameter: 6.4 ⁇ (32.2 mm 2 )] of a radiant indoor machine.
  • Straight pipe parts of the meandering pipe are vertically arranged.
  • the total cross-sectional area (128.8 mm 2 ) of the refrigerant pipe having an inner diameter of 6.4 ⁇ (32.2 mm 2 ) is about 85.1% of that of the refrigerant piping having an inner diameter of 13.88 ⁇ (151.2 mm 2 ) and the flow speed increases.
  • 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 horizontally 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.
  • 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 in FIG. 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 in FIG. 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 in FIG. 3 , and showing the flow of refrigerant during heating by an arrow.
  • FIG. 7 is a schematic explanatory view in the case where the machine is viewed in the B-B direction shown in FIG. 3 .
  • 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 in FIG. 3 , 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.
  • an air conditioning system 100 is constituted by one outdoor machine 1 and two indoor machines connected to the outdoor machine 1 in series.
  • One of the two indoor machines is a general convective indoor machine 2
  • 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 form part of a refrigerant circuit, and cooling operation or heating operation can be performed by circulating refrigerant in the refrigerant circuit.
  • FIGS. 1 and 2 Note that, although one outdoor machine, one convective indoor machine 2 and one radiant indoor machine 10 are shown in FIGS. 1 and 2 , the number of each of the machines is not limited to the number shown in the figures.
  • 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 both of its left and right sides, vertical frames 12 a and 12 b 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 12 a and 12 b.
  • 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 , they are not limited to this.
  • 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 113 a and 113 b .
  • a flow of refrigerant is branched into two flows by the branch pipes 113 a and 113 b .
  • the arrow in FIG. 6 indicates the flow of refrigerant.
  • One flow formed by the branch pipe 113 a passes through the 6 straight pipes 112 shown in the right side of FIG. 6 (second heating element 11 b ), and the other flow formed by the branch pipe 113 b passes through the 6 straight pipes 112 shown at the left side of FIG. 6 (first heating element 11 a ).
  • the refrigerants converge at the collecting part 115 , and the refrigerant flows from the collecting part 115 to the refrigerant circuit 7 .
  • 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 12 a and 12 b 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, and during cooling, the refrigerant flows reversely).
  • the lengths of the first heating element 11 a and the second heating element 11 b are the same, about 6 m. Additionally, the inner diameter, 4.75 ⁇ (17.7 mm 2 ), of the straight pipe 112 is smaller than that, 7.92 ⁇ (49.2 mm 2 ), of the refrigerant piping 7 .
  • the refrigerant piping having an inner diameter of 7.92 ⁇ (49.2 mm 2 ) is branched into two systems by a two-system refrigerant pipe having an inner diameter of 4.75 ⁇ (17.7 mm 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 111 a and 111 b 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 .
  • 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 have to be rotatable.
  • a drain pan 116 which is a water collecting member formed in the shape of a gutter having an open upper part, is arranged with both ends of the pan fixed between the vertical frames 12 a and 12 b .
  • 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 a 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. 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 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 8 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 liquid refrigerant which has flowed out from the indoor heat exchanger 6 , is decompressed by the expansion valve 5 and becomes a low-pressure two-phase refrigerant.
  • the low-pressure two-phase refrigerant flows into the outdoor heat exchanger 4 of the outdoor machine 1 .
  • the low-pressure two-phase refrigerant that 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)
US14/419,526 2014-05-09 2014-12-26 Air conditioning system Abandoned US20160047577A1 (en)

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JP2014097916 2014-05-09
JP2014-097916 2014-05-09
PCT/JP2014/084498 WO2015170431A1 (fr) 2014-05-09 2014-12-26 Système de climatisation

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JP (1) JP6304783B2 (fr)
CN (1) CN105264296A (fr)
AU (1) AU2014393532B2 (fr)
HK (1) HK1218949A1 (fr)
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CN111535726A (zh) * 2020-05-08 2020-08-14 广东工业大学 一种湿式辐射对流调温门窗

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US5036909A (en) * 1989-06-22 1991-08-06 General Motors Corporation Multiple serpentine tube heat exchanger
US5189887A (en) * 1989-12-29 1993-03-02 Kool-Fire Research & Development Heat condensing furnace with de-intensifier tubes
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US11519623B2 (en) * 2018-02-19 2022-12-06 Daikin Industries, Ltd. Air-conditioning apparatus

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AU2014393532A1 (en) 2017-01-05
JPWO2015170431A1 (ja) 2017-05-25
CN105264296A (zh) 2016-01-20
SG11201501227WA (en) 2015-12-30
AU2014393532B2 (en) 2018-09-27
HK1218949A1 (zh) 2017-03-17
EP3141824B1 (fr) 2020-09-16
WO2015170431A1 (fr) 2015-11-12
EP3141824A1 (fr) 2017-03-15
PH12015500378B1 (en) 2019-02-22
MY184976A (en) 2021-04-30
EP3141824A4 (fr) 2017-12-27
JP6304783B2 (ja) 2018-04-04

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