CN103229004B

CN103229004B - Aircondition

Info

Publication number: CN103229004B
Application number: CN201180057064.XA
Authority: CN
Inventors: 森本裕之; 山下浩司
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2011-01-26
Filing date: 2011-01-26
Publication date: 2016-05-04
Anticipated expiration: 2031-01-26
Also published as: EP2669598A1; WO2012101672A1; AU2011357097A1; EP2669598B1; JPWO2012101672A1; AU2011357097B2; US20130213078A1; EP2669598A4; CN103229004A

Abstract

Even if the present invention obtains the aircondition that also can reduce the diameter of low-pressure gas pipe arrangement in the time adopting the little cold-producing medium of refrigerant density when low pressure. This aircondition has refrigerant circulation loop (10) and supercooling mechanism (supercooling heat exchanger (4), throttling arrangement (5) and bypass circulation (7)). In refrigerant circulation loop (10), compressor (1), heat source side heat exchanger (3), throttling arrangement (20) and utilize side heat exchanger (21) to be connected by pipe arrangement, the saturated refrigerant gas density 0 DEG C time is that 35～65% cold-producing medium of R410A cold-producing medium circulates in this refrigerant circulation loop (10). Supercooling mechanism, in the time of cooling operation, the liquid temperature that makes to deliver to from heat source side heat exchanger (3) high pressure liquid refrigerant of throttling arrangement (20) is below 5 DEG C.

Description

Aircondition

Technical field

The present invention relates to aircondition.

Background technology

Before, there is a kind of aircondition, there is supercooling mechanism, use bypass-side cold-producing medium,The refrigerant cools (for example, with reference to patent documentation 1) of throttling arrangement will be delivered to from condenser. At toolIn the aircondition of You Gai supercooling mechanism, owing to being sent to the circulating mass of refrigerant of throttling arrangementReduce, so, the evaporimeter of throttling arrangement back segment and the pressure loss that extends pipe arrangement can be reduced.

Formerly technical literature

Patent documentation

Patent documentation 1: Japanese kokai publication hei 6-265232 communique (Fig. 1, the 6th page)

Summary of the invention

The problem that invention will solve

In recent years, for the viewpoint of greenhouse effects of the earth, restricted use greenhouse effects of the earth coefficient is highThe trend of HFC series coolant (such as R410A, R404A, R407C, R134a etc.),Propose to use little cold-producing medium (for example HFO1234yf, the carbon dioxide of greenhouse effects of the earth coefficientDeng) aircondition. HFO1234yf compared with R410A, refrigerant density when low pressureSignificantly reduce, the pressure characteristic under uniform temp is more much lower than R410A. During this low pressureWhen the cold-producing medium that refrigerant density is little is used in and carries out cooling operation in aircondition, low-pressure gas is joinedThe impact of the pressure loss in pipe is very big. Therefore, exist and must add in order to reduce the pressure lossThe problem of large pipe arrangement diameter.

Especially in the such large system of multi-connected air conditioner for building (10HP), use R410ATime, the diameter of low-pressure gas pipe arrangement isLeft and right, and use cold-producing medium when low pressure closeWhile spending little cold-producing medium, the diameter of low-pressure gas pipe arrangement is approximately 2 times of above-mentioned diameterLeft and right. Therefore, the buckling work of pipe arrangement is very difficult, and processing cost significantly rises.In addition, the refrigerant piping of this thick pipe arrangement diameter, uses on market conventionally hardly, so,Price increases substantially. For this reason, one while using the little cold-producing medium of refrigerant density when low pressureIndividual large problem is the diameter that reduces low-pressure gas pipe arrangement.

The aircondition that patent documentation 1 is recorded, as mentioned above, reducing aspect the pressure loss isEffectively. But the little cold-producing medium of refrigerant density while not considering to use low pressure is as workCold-producing medium, so the effect that reduces of the pressure loss is not very large. Therefore, merely at thisThe little cold-producing medium of refrigerant density while using low pressure in aircondition, as mentioned above, can not separateThe certainly problem in the significantly large footpath of low-pressure gas pipe arrangement.

The present invention makes in order to solve above-mentioned problem, is adopting even if its objective is to provideWhen the little cold-producing medium of refrigerant density when low pressure, also can reduce the air-conditioning of low-pressure gas pipe arrangement diameterDevice.

Solve the technical scheme of problem

Aircondition of the present invention, has: refrigerant circulation loop, with pipe arrangement connect compressor,Heat source side heat exchanger, throttling arrangement and utilize side heat exchanger, the saturated cold-producing medium gas 0 DEG C timeVolume density is that 35～65% cold-producing medium of R410A cold-producing medium is in this refrigerant circulation loopCirculation; And supercooling mechanism, in the time of cooling operation, make to deliver to joint from heat source side heat exchangerThe liquid temperature of the high pressure liquid refrigerant of stream device is below 5 DEG C.

Invention effect

According to the present invention, in the time of cooling operation, make to deliver to throttling arrangement from heat source side heat exchangerThe liquid temperature of high pressure liquid refrigerant be below 5 DEG C, so, can improve refrigerating effect, can subtractFew refrigerant flow. Therefore, can reduce the diameter of low-pressure fitting pipe.

Brief description of the drawings

Fig. 1 is represent one of the loop formation of the aircondition of embodiment of the present invention 1 example generalSlightly circuit structure figure.

Fig. 2 is the system of aircondition in the time of cooling operation pattern that represents embodiment of the present invention 1The mobile refrigerant loop figure of cryogen.

Fig. 3 is the figure that represents the structure example of Double tube type supercooling heat exchanger.

Fig. 4 is the curve map that represents the relation of liquid temperature and flow-rate ratio.

Fig. 5 is the curve map that represents liquid temperature and the relation of pressure loss ratio.

Fig. 6 is the curve map that represents liquid temperature and the relation of pipe arrangement diameter ratio.

Fig. 7 is the system of aircondition in the time heating operation mode that represents embodiment of the present invention 1The mobile refrigerant loop figure of cryogen.

Fig. 8 is represent one of the loop formation of the aircondition of embodiment of the present invention 2 example generalSlightly circuit structure figure.

Fig. 9 is the system of aircondition in the time of cooling operation pattern that represents embodiment of the present invention 2The mobile refrigerant loop figure of cryogen.

Figure 10 is the cold and hot simultaneous type of embodiment of the present invention 3() aircondition loop formFigure.

Detailed description of the invention

Below, with reference to the accompanying drawings of embodiments of the present invention.

Embodiment 1

Fig. 1 is represent one of the loop formation of the aircondition of embodiment of the present invention 1 example generalSlightly circuit structure figure. With reference to Fig. 1, illustrate that the detailed loop of aircondition forms below. ?In Fig. 1, represent as an example of the situation that connected 4 indoor sets 20 example. In addition, at bagDraw together Fig. 1 in interior the following drawings, the magnitude relationship of each component parts is sometimes not identical with reality.In addition, in Fig. 1 and aftermentioned figure, the parts that are marked with the same tag are identical or suitable parts,This point is all the same in description full text. In addition, the formation of setting forth in description full textThe mode of key element, only, as exemplifying, is not limited to recorded mode.

As shown in Figure 1, aircondition 100 is configured to, off-premises station (heat source machine) 10 and indoorBelow machine 20a～20d(, be sometimes generically and collectively referred to as indoor set 20) by extending pipe arrangement 400a and prolongationBelow pipe arrangement 400b(, be sometimes generically and collectively referred to as and extend pipe arrangement 400) connect. , at aircondition 100In, many indoor sets 20 are connected in parallel with respect to off-premises station 10. Extending pipe arrangement 400 is refrigerationThe refrigerant piping that agent (heat source side cold-producing medium) is passed through. In addition, in aircondition 100,HFO1234y or HFO1234ze are enclosed as cold-producing medium.

[off-premises station 10]

Off-premises station 10 has the flow passage selector devices 2 such as compressor 1, cross valve, heat source side heat is handed overParallel operation 3, supercooling heat exchanger 4 and reservoir 6, by pipe arrangement, after indoor set 20State and utilize side heat exchanger 21 and throttling arrangement 22 to connect, formed the refrigeration of refrigerant circulationAgent closed circuit. Off-premises station 10 also has the heat source side of being positioned at heat exchanger 3 and throttling arrangement 22Between supercooling heat exchanger 4. In addition, off-premises station 10 has bypass circulation 7, this bypassLoop 7 is from branch between supercooling heat exchanger 4 and throttling arrangement 22, via throttling arrangement 5Be connected to the entrance side of reservoir 6 with the low-pressure side of supercooling heat exchanger 4. Supercooling heat is handed overParallel operation 4 makes the high-pressure side cold-producing medium between heat source side heat exchanger 3 and throttling arrangement 22 and is savingStream device 5 carries out heat by low-pressure side cold-producing medium that an is post-decompression part for high-pressure side cold-producing medium and hands overChange, by high-pressure side refrigerant cools.

Compressor 1 sucks cold-producing medium, transports after this refrigerant compression being become to the state of HTHPDeliver in refrigerant circulation loop, for example, can adopt the formations such as the controllable frequency-changeable compressor of capacity.Flow passage selector device 2 is for switching the mobile and cooling operation of the cold-producing medium heating under operation modeFlowing of cold-producing medium under pattern.

Heat source side heat exchanger (outdoor heat exchanger) 3 is heating when running as evaporimeterPlay a role, in the time of cooling operation, play a role as radiator, from omitting illustrated fanBetween the air of supplying with in pressure fan and cold-producing medium, carry out heat exchange. Reservoir 6 is located at compressor1 suction side, for accumulating when heating operation mode and difference when cooling operation patternThe residual refrigerant that produces, change (the running platform of for example indoor set 2 with respect to the running of transitionThe variation of number) and the residual refrigerant of generation.

In addition, in the outlet (hydraulic fluid side) of supercooling heat exchanger 4, be provided with pressure sensor 8With temperature sensor 9. At off-premises station 10, be also provided with the inlet temperature for detection of compressor 1And the various sensors such as the sensor of discharge temperature (not shown).

Be provided with control device 10A at off-premises station 10. Control device 10A is connected to, and can connectReceive the detection of the various sensors in off-premises station 10 and the various sensors of aftermentioned in indoor set 20Signal. Control device 10A, according to the detection signal from various sensors, carries out throttling dressPut 5 and the controls such as adjustment such as the aperture of throttling arrangement 22. In addition, control device 10A, passes throughThe switching of flow passage selector device 2, carries out cooling operation pattern and the running that heats operation mode.In Fig. 1, represent to be only provided with at off-premises station 10 formation of control device 10A, but also canSo that the sub-control device of the partial function with control device 10A to be set in each indoor set 20,Utilize the data communication between control device 10A and sub-control device to carry out online process.

[indoor set 20]

In indoor set 20, utilize side heat exchanger (indoor side heat exchanger) 21(21a～21d) with throttling arrangement 22(22a～22d) be connected in series, form refrigerant circulation loopA part. Utilize side heat exchanger 21 in the time heating running, to play radiator, in refrigerationWhen running, play evaporimeter, from omit air that the pressure fan such as illustrated fan supplies withBetween cold-producing medium, carry out heat exchange, generate for supply with air-conditioning object space heat with air orCooling air. Throttling arrangement 22 has the function of pressure-reducing valve, expansion valve, and cold-producing medium is reduced pressureAnd it is expanded, the such as electronic expansion valve that can be controlled changeably by aperture etc. forms.

In embodiment 1, represent as an example of the situation that connected 4 indoor sets 20 example.In figure, from left side, be expressed as successively indoor set 20a, indoor set 20b, indoor set 20c,Indoor set 20d. In addition, with indoor set 20a～20d accordingly, utilize side heat exchanger 21,Also from left side, be expressed as successively and utilize side heat exchanger 21a, utilize side heat exchanger 21b,Utilize side heat exchanger 21c, utilize side heat exchanger 21d. Similarly, throttling arrangement 22,Also from left side, be expressed as successively throttling arrangement 22a, throttling arrangement 22b, throttling arrangement 22c,Throttling arrangement 22d. In addition, the connection number of units of indoor set 20 is not limited to 4.

In indoor set 20, be provided with temperature in the refrigerating fluid discharging and feeding of utilizing side heat exchanger 21Sensor 23a～23d, 24a～24d. The inspection of temperature sensor 23a～23d, 24a～24dSurvey signal and be output to control device 10A. With controlling dress in the present embodiment at off-premises stationPut 10A and implement the control to indoor set, still, also can control device be set at each indoor set,Control indoor set 20a～20d with this control device.

In aircondition 100, as mentioned above, cold-producing medium is used as low pressure refrigerantHFO1234yf or HFO1234ze. The Saturated vapor density of these cold-producing mediums in the time of 0 DEG C is as tableShown in 1. As can be known from Table 1, with respect to the gas density of R410A, HFO1234yf is58%, HFO1234ze is 38%. That is to say, and use in present most airconditionsR410A cold-producing medium is compared, and the gas density when low pressure of this cold-producing medium is 35～65% left and right.In addition, this value is from NIST(NationalInstituteofStandardsandTechnology, national standard and technical research institute) REFPROPVersion8.0 that sellsIn obtain.

[table 1]

Cold-producing medium	R410A	HFO1234yf	HFO1234ze
				Saturated vapor density [kg/m³]	30.575	17.646	11.724

Like this, while using the little cold-producing medium of gas density, if merely with identical cold-producing mediumFlow (kg/hr) flows in pipe arrangement, and the flow velocity of HFO1234yf is approximately 2 times of R410A.Due to square being directly proportional of the pressure loss and flow velocity, so the pressure loss of HFO1234yf isApproximately 4 times of R410A. As a result, in the time of the pipe arrangement of use and R410A cold-producing medium same diameter,The pressure loss is 4 times, and performance significantly reduces. For suppress HFO1234yf cold-producing medium withThere is the equal pressure loss and the performance that causes reduces, pipe arrangement diameter toward cold-producing medium (R410A)Must be 2 times of refrigerant piping before. HFO1234yf and HFO1234ze are phases roughlySame density, so the pressure loss of HFO1234yf and HFO1234ze is roughly the sameValue.

In the such low capacity system of room air conditioner, even by pipe arrangement enlarged diameter to 2 times,Because original pipe arrangement diameter is just little, so, in processing, there is no special problem. But,In the such hicap of multi-connected air conditioner for building (10HP), as above in the face of existing skillDescribed in the explanation of art, pipe arrangement diameter isLeft and right, so, in application property, processingThere is larger harmful effect cost aspect.

For this reason, in present embodiment 1, make from when the cooling operation pattern as radiatorThe temperature that heat source side heat exchanger 3 is delivered to the high pressure liquid refrigerant of throttling arrangement 22 is reduced toBelow 5 DEG C. This is the emphasis of present embodiment 1. In addition, in this example, make condensation temperature beMore than 49 DEG C, the target temperature of the liquid temperature of high pressure liquid refrigerant is 5 DEG C of degree of supercoolings when followingBe more than 44 DEG C. Like this, for example, by making the liquid temperature of high pressure liquid refrigerant below 5 DEG C,Compared with when making liquid temperature be 44 DEG C (5 DEG C of degree of supercoolings), can improve refrigerating effect. As a result, canTo reduce refrigerant flow, can reduce pipe arrangement size.

The various operation modes that aircondition 100 is carried out are described below.

[cooling operation pattern]

Fig. 2 is the mobile system that represents the cold-producing medium of aircondition 100 in the time of cooling operation patternRefrigerant circuit figure. In Fig. 2, describe as an example of the situation that drives whole indoor set 20 example.In Fig. 2, arrow represents the flow direction of cold-producing medium.

The cold-producing medium of low-temp low-pressure is compressed by compressor 1, becomes the gas refrigerant of HTHPAnd discharge. The gas refrigerant of the HTHP of discharging from compressor 1, switches dress by streamPut 2, flow into heat source side heat exchanger 3.

Flow into the gas refrigerant of the HTHP of heat source side heat exchanger 3, by with from economizeThe air that slightly illustrated pressure fan is supplied with carries out heat exchange, becomes liquid condition, from heat source side heatInterchanger 3 flows out. The cold-producing medium of the liquid condition flowing out from heat source side heat exchanger 3 flowed intoThe high-pressure side of cooling heat exchanger 4. Pass through of cold-producing medium of supercooling heat exchanger 4Point reduced pressure by the throttling arrangement 5 of bypass circulation 7 and become the cold-producing medium of the gas-liquid two-phase of low pressure,Flow into the low-pressure side of supercooling heat exchanger 4. Like this, the high-pressure side of supercooling heat exchanger 4Liquid refrigerant, carry out heat exchange with the cold-producing medium of low-pressure side and cooling, liquid temperature reduces and (increasesBig supercooling degree) and flow out from supercooling heat exchanger 4. The low-pressure side of supercooling heat exchanger 4Low pressure two-phase system cryogen, carry out heat exchange with on high-tension side cold-producing medium and become the gas of low pressureCold-producing medium, from supercooling heat exchanger 4 out, flows to reservoir 6.

Here as mentioned above, in this example, adjust the aperture of throttling arrangement 5, supercooling,The liquid temperature of the high pressure liquid refrigerant that heat exchanger 4 exports is reduced to 5 DEG C of left and right. Like this, byImprove in refrigerating effect, so the opening ratio of throttling arrangement 5 increases when for example degree of supercooling is 5 DEG CAdd. Therefore, reduced the cold-producing medium quantity delivered to utilizing side heat exchanger 21. As a result, canReduce pipe arrangement size. In addition, the aperture adjustment of throttling arrangement 5 is according to pressure sensor 8 HesThe detection signal of temperature sensor 9, undertaken by control device 10A.

The supercooling heat exchanger 4 of present embodiment 1, as shown in Figure 3, adopts dual pipe sideFormula, high-pressure side cold-producing medium is that high pressure liquid refrigerant flows at annulus, low-pressure side cold-producing medium isGas-liquid two-phase cold-producing medium flows in inner tube. This is because if gas-liquid two-phase cold-producing medium is flow toAnnulus, liquid refrigerant can be partial to the bottom of annulus and cause heat exchange performance to reduce.

In addition, supercooling heat exchanger 4 is not limited to dual pipe mode, also can adopt plateFormula heat exchanger. Adopting when heat-exchangers of the plate type, by make low-pressure gas-liquid two-phase system cryogen fromLower toward upper reaches and high pressure liquid refrigerant flows (stream in opposite directions) from top to bottom, can effectively bring into play heatExchanger performance.

The liquid refrigerant flowing out from supercooling heat exchanger 4, by extending pipe arrangement 400a, courtIndoor set 20, flow into respectively indoor set 20a～indoor set 20d. Flow into indoor set 20a～The cold-producing medium of indoor set 20d, is expanded and (is subtracted by throttling arrangement 22a～throttling arrangement 22d respectivelyPress), become the gas-liquid two-phase state of low-temp low-pressure. The cold-producing medium of this gas-liquid two-phase state flows respectivelyEnter to utilize side heat exchanger 21a～utilize side heat exchanger 21d. Flow into and utilize side heat exchanger21a～utilize the cold-producing medium of the gas-liquid two-phase state of side heat exchanger 21d, with illustrated from omittingThe air (room air) that pressure fan is supplied with carries out heat exchange and absorbs heat from air, becomes lowThe gas refrigerant of pressing, from utilizing side heat exchanger 21a～utilize side heat exchanger 21d to flow out.

Here to the cold-producing medium quantity delivered of utilizing side heat exchanger 21, utilize side heat according to being located at,Temperature sensor 23a～the 23d of the refrigerating fluid discharging and feeding of interchanger 21, the temperature of 24a～24dInformation is adjusted. Specifically, control device 10A obtains from these temperature sensorsThe information of 23a～23d, 24a～24d, according to the information obtaining, calculates the degree of superheat (outlet sideThe refrigerant temperature of refrigerant temperature-entrance). Then, determine the aperture of throttling arrangement 22So that this degree of superheat becomes 2～5 DEG C of left and right, adjust to the cold-producing medium that utilizes side heat exchanger 21Quantity delivered.

From the low pressure gas system of utilizing side heat exchanger 21a～utilize side heat exchanger 21d to flow outCryogen, flows out from indoor set 20a～indoor set 20d, by extending pipe arrangement 400b, flows into chamberOuter machine 10. Flow into the cold-producing medium of off-premises station 10, by flow passage selector device 2, flow into liquid storageDevice 6. The cold-producing medium that flow into reservoir 6 is separated into liquid refrigerant and gas refrigerant,Gas refrigerant is sucked by compressor 1 again.

Under this cooling operation pattern, carry out degree of superheat control and make the degree of superheat at each indoor set 20Become positive region, so the cold-producing medium of liquid condition does not flow into reservoir 6. But, in mistakeWhen crossing state or having the indoor set 20 stopping, a small amount of liquid state (mass dryness fraction 0.95 left and right) sometimesCold-producing medium can flow into reservoir 6. After flowing into the liquid refrigerant evaporates of reservoir 6, pressedContracting machine 1 aspirates or the quilt via being located at the spill port that reservoir 6 exports (omitting diagram)Compressor 1 aspirates.

Illustrate that the high pressure liquid refrigerant temperature that supercooling heat exchanger 4 is exported reduces below,The effect producing to 5 DEG C of left and right. Fig. 4 represents the fluid temperature of supercooling heat exchanger outletRelation with refrigerant flow minimizing ratio. Refrigeration during 44 DEG C of liquid temperatures (5 DEG C of degree of supercoolings)Agent flux ratio is made as 1. The tentative calculation condition of other calculating is that evaporating temperature is 0 DEG C, condensation temperatureIt is 49 DEG C.

As can be seen from Figure 4, be 5 DEG C of left sides by making the outlet fluid temperature of supercooling heat exchanger 4The right side, flow is 66% left and right of liquid temperature while being 44 DEG C (5 DEG C of degree of supercoolings), flows to prolongation pipe arrangementThe refrigerant flow of 400a, 400b also reduces by 34%.

Fig. 5 represents that the liquid temp of supercooling heat exchanger outlet and the pipe arrangement pressure loss reduce ratioThe figure of the relation of example. Pressure loss ratio during 44 DEG C of liquid temperatures (5 DEG C of degree of supercoolings) is made as 1.As can be seen from Figure 5, be 5 DEG C of left and right by making the outlet fluid temperature of supercooling heat exchanger 4,The pressure loss is 44% left and right of liquid temperature while being 44 DEG C (5 DEG C of degree of supercoolings), extend pipe arrangement 400a,The pressure loss of 400b also reduces by 56%.

Fig. 6 represents that the liquid temp of supercooling heat exchanger outlet and pipe arrangement diameter reduce ratioThe figure of relation. Pipe arrangement natural scale during 44 DEG C of liquid temperatures (5 DEG C of degree of supercoolings) is made as 1. FromFig. 6 is known, when making the outlet fluid temperature of supercooling heat exchanger 4 be 5 DEG C of left and right,Pipe arrangement diameter is 80% left and right of liquid temperature while being 44 DEG C (5 DEG C of degree of supercoolings), extend pipe arrangement 400a,The diameter of 400b also reduces 20%. That is, pipe arrangement diameter can be reduced to 1 to 2 rank, canTo reduce to extend the diameter of pipe arrangement 400a, 400b. The low-pressure fitting pipe that gas refrigerant passes through prolongsThe impact of the pressure loss of long pipe arrangement 400b is large, and than extending, pipe arrangement 400a is thick. Therefore, canBy the pipe arrangement diameter that extends pipe arrangement 400b reduce 1～2 rank can obtain reduce pipe arrangement cost,The effect that improves application property, reduction construction cost is very effective.

[heating operation mode]

Fig. 7 is the mobile system that represents the cold-producing medium of aircondition 100 in the time heating operation modeRefrigerant circuit figure. In Fig. 7, describe as an example of the situation that drives whole indoor set 20 example.In Fig. 7, arrow represents the flow direction of cold-producing medium. In addition, heating under operation mode jointStream device 5 is closed.

The cold-producing medium of low-temp low-pressure is compressed by compressor 1, becomes the gas refrigerant of HTHPAnd discharge. The gas refrigerant of the HTHP of discharging from compressor 1, switches dress by streamPut 2, flow out from off-premises station 10, by extending pipe arrangement 400b, flow into respectively indoor set 20a～Indoor set 20d.

Flow into the gas refrigerant of the HTHP of indoor set 20a～indoor set 20d, in profitWith side heat exchanger 21a～utilize side heat exchanger 21d, and supply with from omitting illustrated pressure fanAir (room air) carry out heat exchange and to air heat radiation, become liquid condition, from profitFlow out with side heat exchanger 21a～utilize side heat exchanger 21d. The liquid refrigerant of this high pressure,Expanded (decompression) by throttling arrangement 22a～throttling arrangement 22d respectively, become the gas of low-temp low-pressureLiquid two-phase state, flows out from indoor set 20a～indoor set 20d.

To the cold-producing medium quantity delivered of utilizing side heat exchanger 21, according to utilizing side heat to hand over from being located atTemperature sensor 23a～the 23d of the refrigerant outlet of parallel operation 21 and pressure sensor (not shown)Information adjust. Specifically, use from the information of these sensors and calculate degree of supercooling(the cold-producing medium temperature of the saturation temperature-outlet side converting from the detected pressures of the cold-producing medium of outlet sideDegree), determine that the aperture of throttling arrangement 22 is so that this degree of supercooling becomes 2～5 DEG C of left and right, it is right to adjustThe cold-producing medium quantity delivered of heat source side heat exchanger 3.

The system of the gas-liquid two-phase state of the low-temp low-pressure flowing out from indoor set 20a～indoor set 20dCryogen, by extending pipe arrangement 400a, flows into off-premises station 10. This cold-producing medium is directly by supercoolingHeat exchanger 4, flows into heat source side heat exchanger 3. Flow into the low temperature of heat source side heat exchanger 3The cold-producing medium of the gas-liquid two-phase state of low pressure, and enters from omitting the air that illustrated pressure fan supplies withRow heat exchange, from air heat absorption, mass dryness fraction increases gradually. Then, at heat source side heat exchanger 3Outlet, become the gas-liquid two-phase cold-producing medium of the state that mass dryness fraction is large, from heat source side heat exchanger 3Flow out. The cold-producing medium flowing out from heat source side heat exchanger 3, by flow passage selector device 2, streamEnter reservoir 6. The cold-producing medium that flow into reservoir 6 is separated into liquid refrigerant and gas systemCryogen, gas refrigerant is sucked by compressor 1 again.

In the loop of present embodiment 1, heating under operation mode, although can not reduce streamEnter to extend the refrigerant flow of pipe arrangement 400b, still, extend in pipe arrangement 400b owing to flowing toHigh-pressure gas refrigerant (cold-producing medium that density is large), so the impact of the pressure loss is little, makesCold-producing medium does not flow to supercooling heat exchanger 4. In addition, make cold-producing medium flow to supercooling heat exchangeWhen device 4, also can reduce the low-pressure fitting pipe (outlet of supercooling heat exchanger 4 of off-premises station 10The pipe arrangement of the entrance of → evaporimeter → reservoir 6) diameter. In addition, heating operation modeUnder similarly, can make from utilizing side heat exchanger 21 to deliver to the high pressure liquid of throttling arrangement 22The liquid temperature of cryogen becomes below 5 DEG C, or degree of supercooling is become more than 44 DEG C.

As mentioned above, according to present embodiment 1, in the time of cooling operation pattern, cold by usingBut mechanism's (supercooling heat exchanger 4, throttling arrangement 5 and bypass circulation 7) is by high pressure liquid temperatureBe reduced to 5 DEG C of left and right, the diameter that extends pipe arrangement (low-pressure gas pipe arrangement) 400b can be reduced1～2 rank. As a result, can reduce pipe arrangement cost and construction cost, and, can reduce because ofThe discarded energy loss causing, is also conducive to environmental protection. In addition, damage owing to can reducing pressureLose, so, can carry out the running that efficiency is high, also there is energy-saving effect.

Embodiment 2

In embodiment 1, by supercooling heat exchanger 4, throttling arrangement 5 and bypass circulation 7Form supercooling mechanism, and in embodiment 2, the refrigerant circulation of being used by supercooling returnsRoad forms supercooling mechanism.

Fig. 8 is the skeleton diagram of the aircondition of embodiment of the present invention 2. This aircondition 101There is refrigerant circulation loop 101A and supercooling loop 101B. In addition, at embodimentIn 2, the difference of main explanation and embodiment 1, the part identical with embodiment 1Be marked with the same tag. In addition, concrete to what be suitable for the same structure part of embodiment 1Example and modified example, be applicable to present embodiment too. This point is in embodiment described laterToo.

[refrigerant circulation loop 101A]

Refrigerant circulation loop 101A have the flow passage selector devices 2 such as compressor 1, cross valve,Heat source side heat exchanger 3 and reservoir 6, by pipe arrangement, hand over the side heat of utilizing of indoor set 20Parallel operation 21 and throttling arrangement 22 connect, and have formed the freeze cycle of refrigerant circulation.

[supercooling loop 101B]

Supercooling has compressor 31, condenser 32, throttling arrangement 33 and with loop 101BSupercooling heat exchanger 34, they by pipe arrangement connect formed refrigerant circulation, playThe freeze cycle of supercooling mechanism effect. Supercooling heat exchanger 34, makes to use loop in supercoolingThe low-pressure side cold-producing medium of circulation and the heat source side heat that is positioned at refrigerant circulation loop 101A in 101BHigh-pressure side cold-producing medium between interchanger 3 and throttling arrangement 22, carries out heat exchange.

In refrigerant circulation loop A except utilize side heat exchanger 21 and throttling arrangement 22 withOuter each equipment and supercooling loop 101B, be arranged in same casing, forms off-premises station30. In addition, to carry Capacity Ratio compressor 1 with the compressor 31 of loop 101B little in supercoolingCompressor.

Be provided with control device 30A at off-premises station 30. Control device 30A is connected to, and can connectReceive the detection of the various sensors in off-premises station 30 and the various sensors of aftermentioned in indoor set 20Signal. Control device 30A, according to the detection signal from various sensors, carries out throttling arrangement33 and the control such as the aperture adjustment of throttling arrangement 22. In addition, control device 30A, by streamThe switching of circuit switching device 2, carries out cooling operation pattern and the running that heats operation mode. FigureIn 8, represent to be only provided with control device 30A at off-premises station 30, still, also can be in each chamberInterior machine 20 arranges the sub-control device of the partial function with control device 30A, utilizes and controlsOnline process is carried out in data communication between device 30A and sub-control device.

Each operation mode that aircondition 101 is carried out is described below.

[cooling operation pattern]

Fig. 9 is the system of aircondition in the time of cooling operation pattern that represents embodiment of the present invention 2The mobile refrigerant loop figure of cryogen. In Fig. 9, to drive the situation of whole indoor set 20For example describes. In Fig. 9, arrow represents the flow direction of cold-producing medium.

First the action of refrigerant circulation loop 101A is described. The cold-producing medium of low-temp low-pressure is pressedContracting machine 1 compresses, and becomes the gas refrigerant of HTHP and discharges. Discharge from compressor 1The gas refrigerant of HTHP, by flow passage selector device 2, flows into heat source side heat exchanger 3.

Flow into the gas refrigerant of the HTHP of heat source side heat exchanger 3, with from economize sketch mapThe air that the pressure fan showing is supplied with carries out heat exchange, becomes liquid condition, from heat source side heat exchangeDevice 3 flows out, and flows into supercooling heat exchanger 34. Flow into the liquid of supercooling heat exchanger 34Cryogen is by the gas-liquid two-phase refrigerant cools generating with loop 101B in supercooling, liquid temperatureReduce (increase degree of supercooling), flow out from supercooling heat exchanger 34.

Here, in embodiment 2, also with embodiment 1 similarly, supercooling heat is handed overThe liquid temperature of the high pressure liquid refrigerant that parallel operation 34 exports is reduced to 5 DEG C of left and right. This high pressure liquid systemThe temperature of cryogen, depends on the heat exchange amount in supercooling heat exchanger 34. Therefore, by adjustingHave suffered the aperture of the cooling throttling arrangement 33 with loop 101B, the rotating speed of compressor 31,It is 5 DEG C of left and right that the liquid temperature of the high pressure liquid refrigerant that supercooling heat exchanger 34 exports is reduced to.As a result, can obtain the effect same with embodiment 1.

The liquid refrigerant flowing out from supercooling heat exchanger 34, by extending pipe arrangement 400a,Towards indoor set 20, flow into respectively indoor set 20a～indoor set 20d. Flow into indoor set 20a～The cold-producing medium of indoor set 20d respectively by throttling arrangement 22a～throttling arrangement 22d expand (decompression),Become the gas-liquid two-phase state of low-temp low-pressure. The cold-producing medium of this gas-liquid two-phase state flows into respectively profitWith side heat exchanger 21a～utilize side heat exchanger 21d. Flow into and utilize side heat exchanger21a～utilize the cold-producing medium of the gas-liquid two-phase state of side heat exchanger 21d, with illustrated from omittingThe air (room air) that pressure fan is supplied with carries out heat exchange and absorbs heat from air, becomes lowThe gas refrigerant of pressing, from utilizing side heat exchanger 21a～utilize side heat exchanger 21d to flow out.

Here to the cold-producing medium quantity delivered of utilizing side heat exchanger 21, utilize side heat according to being located at,Temperature sensor 23a～the 23d of the refrigerating fluid discharging and feeding of interchanger 21, the temperature of 24a～24dInformation is adjusted. Specifically, control device 30A, according to from these TEMPsThe temperature information of device 23a～23d, 24a～24d, calculates the degree of superheat (cold-producing medium of outlet sideThe refrigerant temperature of temperature-entrance side). Then, with embodiment 1 similarly, determine throttlingThe aperture of device 22, so that this degree of superheat becomes 2～5 DEG C of left and right, is adjusted to utilizing side heat exchangeThe cold-producing medium quantity delivered of device 21.

Under this cooling operation pattern, carry out degree of superheat control at each indoor set 20, so, liquidThe cold-producing medium of body state does not flow into reservoir 6. But, in transition state or have and stopWhen indoor set 20, sometimes have a small amount of liquid state (mass dryness fraction 0.95 left and right) cold-producing medium and flow into storageLiquid device 6. After flowing into the liquid refrigerant evaporates of reservoir 6, aspirated by compressor 1, orVia being located at spill port (omitting diagram) on the outlet pipe arrangement of reservoir 6 by compressor 1Suction.

The action of supercooling loop 101B is described below. Cold-producing medium is compressed by compressor 31,Become the gas refrigerant of HTHP and discharge. The gas of the HTHP of discharging from compressor 31Cryogen flows into condenser 32. Flow into the gas refrigerant of the HTHP of condenser 32,With carry out heat exchange from omitting the air that illustrated pressure fan supplies with, become liquid condition, from coldCondenser 32 flows out, flow throttling device 33. As mentioned above, adjust the aperture of throttling arrangement 33,So that the temperature of the high pressure liquid refrigerant that supercooling heat exchanger 34 exports is reduced to 5 DEG C of left sidesRight. The cold-producing medium that flow into throttling arrangement 33 is depressurized the gas-liquid two-phase flow that becomes low pressure, flows intoSupercooling heat exchanger 34. Flow into the gas-liquid two-phase cold-producing medium of supercooling heat exchanger 34,Carry out heat exchange with the high pressure liquid refrigerant generating at refrigerant circulation loop 101A. Heat is handed overGas-liquid two-phase cold-producing medium after changing, becomes the gas refrigerant of low pressure, from supercooling heat exchanger34 flow out, and are again aspirated by compressor 31.

In embodiment 2, also with embodiment 1 similarly, with supercooling heat exchanger 34Make the temperature of the high pressure liquid refrigerant flowing out from supercooling heat exchanger 34 be reduced to 5 DEG C of left sidesRight. As a result, with embodiment 1 similarly, can will extend pipe arrangement (low-pressure gas pipe arrangement)The pipe arrangement diameter of 400b reduces 1～2 rank, can reduce pipe arrangement cost and construction cost.

In the loop of present embodiment 2, with embodiment 1 similarly, heating operational modeWhen formula, flow into although can not reduce the refrigerant flow that extends pipe arrangement 400b,, due to streamWhat enter is the gas refrigerant (cold-producing medium that density is large) of high pressure, so, the impact of the pressure lossLittle, do not make cold-producing medium flow to supercooling heat exchanger 34. , supercooling is used loop 101B notRunning.

In addition, in present embodiment 2, use at refrigerant circulation loop 101A and supercoolingIn the 101B of loop, use identical cold-producing medium HFO1234yf or HFO1234ze, but alsoCan be in supercooling with using the cold-producing medium that other greenhouse effects of the earth coefficient is little in the 101B of loop,Such as carbon dioxide, HC cold-producing medium etc.

Embodiment 3

In the aircondition of embodiment 3, can carry out the air-conditioning dress of refrigeration and heating type simultaneouslyThe off-premises station 40 of putting adopts shown in the off-premises station 10 of the embodiment 1 shown in Fig. 1 or Fig. 8The off-premises station 30 of embodiment 2.

Figure 10 is the general structural map of the aircondition of embodiment of the present invention 3. In Figure 10,Expression has the situation of the off-premises station 10 among off-premises station 10 or off-premises station 30.

This aircondition 102 is substantially by heat source machine (off-premises station) 40, thermal medium transcriber 60Form with indoor set 50. Off-premises station 40 and thermal medium transcriber 60, via thermal medium transcriberHeat exchanger 61b between heat exchanger 61a and thermal medium between the thermal medium in 60, joins with cold-producing mediumPipe 401 connects. In addition, thermal medium transcriber 60 and indoor set 50, also via between thermal mediumHeat exchanger 61b between heat exchanger 61a and thermal medium, connects with pipe arrangement 500.

[off-premises station 40]

Off-premises station 40, as mentioned above, has the off-premises station of the embodiment 1 shown in pie graph 1Each equipment of 10 and various sensor, with embodiment 1 and embodiment 2 similarly, highThe liquid temperature of press liquid cold-producing medium is reduced to 5 DEG C of left and right. In addition, at off-premises station 40, in order to make systemCryogen flows towards a direction, is also provided with 4 check valve 41a～41d. Forming such returningIn the situation on road, can only in cooling operation, reduce the temperature of high pressure liquid refrigerant.

Check valve 41d is located at the cold-producing medium between thermal medium transcriber 60 and flow passage selector device 2On pipe arrangement 401, allow heat source side cold-producing medium only towards predetermined direction (from thermal medium transcriber 60Towards the direction of off-premises station 40) flow. Check valve 41a is located at heat source side heat exchanger 3 and is situated between with heatOn the refrigerant piping 401 that qualitative change is changed planes between 60, allow that heat source side cold-producing medium is only towards predetermined partyFlow to (direction from off-premises station 40 towards thermal medium transcriber 60). Check valve 41b is located atThe 1st connecting pipings 42a is upper, makes the heat source side refrigeration of discharging from compressor 1 in the time heating runningAgent flows to thermal medium transcriber 60. It is upper that check valve 41c is located at the 2nd connecting pipings 42b, in systemWhen heat run, make the heat source side cold-producing medium returning from thermal medium transcriber 60 flow to the suction of compressor 1Enter side.

The 1st connecting pipings 42a, in off-premises station 40, flow passage selector device 2 and check valveBetween refrigerant piping 401 between 41d and check valve 41a and thermal medium transcriber 60Refrigerant piping 401 couples together. The 2nd connecting pipings 42b, in off-premises station 40, singleTo refrigerant piping 401 and heat source side heat exchange between valve 41d and thermal medium transcriber 60Refrigerant piping 401 between device 3 and check valve 41a couples together. In addition, Tu10Zhong,Represent to be provided with the 1st connecting pipings 42a, the 2nd connecting pipings 42b, check valve 41a, unidirectionalThe example of valve 41b, check valve 41c and check valve 41d, but be not limited thereto, not necessarilyLeave no choice but arrange these parts.

In addition, be provided with control device 40A at off-premises station 40. Control device 40A is connected to,Can receive the inspection of the various sensors in off-premises station 40, indoor set 50 and thermal medium transcriber 60Survey signal. Control device 40A, according to the detection signal from various sensors, carries out throttlingThe controls such as the aperture adjustment of device 5 and throttling arrangement 22. In addition, control device 40A, passes throughThe switching of flow passage selector device 2, carries out cooling operation pattern and the running that heats operation mode.In Figure 10, represent to be only provided with at off-premises station 40 structure of control device 40A, still, alsoCan the part with control device 40A be set at each indoor set 50 and thermal medium transcriber 60The sub-control device of function, utilizes the data communication between control device 40A and sub-control deviceCarry out online process. In addition, also can control device 40A be set in each unit, also canControl device 40A to be set at thermal medium transcriber 60.

[indoor set 50]

In indoor set 50, carry respectively load side heat exchanger 51(51a～51d). ShouldLoad side heat exchanger 51, by pipe arrangement 500, with the thermal medium flow of thermal medium transcriber 60Adjusting device 74(74a～74d) and the 2nd heat medium flow circuit switching device 73(73a～73d)Connect. This load side heat exchanger 51, makes the sky of supplying with from omitting the pressure fans such as illustrated fanAdjust air and the thermal medium of object space to carry out heat exchange, generate the system for supplying with the interior spaceAir or cooling air for heat.

In this Figure 10, situation about being connected with thermal medium transcriber 60 exemplified with 4 indoor sets 50.In figure, from below, be expressed as successively indoor set 50a, indoor set 50b, indoor set 50c,Indoor set 50d. In addition, with indoor set 50a～50d accordingly, load side heat exchanger 51,Also from below, be expressed as successively load side heat exchanger 51a, load side heat exchanger 51b,Load side heat exchanger 51c, load side heat exchanger 51d. In addition, same with Fig. 1 and Fig. 2Ground, the number of units of indoor set 50 is not defined as 4 shown in Figure 10.

[thermal medium transcriber 60]

Thermal medium transcriber 60 is equipped with heat exchanger 61(61a, 61b between 2 thermal mediums),2 throttling arrangement 62(62a, 62b), 2 opening and closing device 63(63a, 63b), 2 streamsCircuit switching device 64(64a, 64b), 2 pump 71(71a, 71b), 4 the 1st thermal mediumsFlow passage selector device 72(72a～72d), 4 the 2nd heat medium flow circuit switching device 73(73a～73d) and 4 heat medium flow amount adjusting apparatus 74(74a～74d). Heat exchange between thermal mediumDevice 61 is equivalent to the side heat of utilizing of the refrigerant circulation loop that forms above-mentioned embodiment 1,2 and hands overParallel operation.

Hot between heat exchanger 61a, thermal medium between heat exchanger 61(thermal medium between 2 thermal mediumsInterchanger 61b), there is the function of condenser (radiator) or evaporimeter, freeze in heat source sideBetween agent and thermal medium, carry out heat exchange, generate and be accumulated in heat source side refrigeration at off-premises station 40Cold energy in agent or thermal energy transfer are to thermal medium. Between thermal medium, heat exchanger 61a is located at cold-producing mediumBetween throttling arrangement 62a and flow passage selector device 64a in closed circuit A, at cooling and warmingWhile mixing operation mode, for the heating of thermal medium. In addition, heat exchanger 61b between thermal mediumBe located between the throttling arrangement 62b and flow passage selector device 64b in refrigerant circulation loop A,In the time of cooling and warming mixing operation mode, cooling for thermal medium. Here be provided with 2,Heat exchanger 61 between thermal medium, but also can arrange 1, also can arrange more than 3.

2 throttling arrangement 62(throttling arrangement 62a, throttling arrangement 62b), have pressure-reducing valve,The function of expansion valve, makes its expansion by the decompression of heat source side cold-producing medium. Throttling arrangement 62a is in systemIn the flowing of heat source side cold-producing medium when blowdown firing, be located at the upstream of heat exchanger 61a between thermal mediumSide. The heat source side cold-producing medium of throttling arrangement 62b in the time of cooling operation flow in be located at thermal mediumBetween the upstream side of heat exchanger 61b. 2 throttling arrangements 62 can be controlled changeably by apertureThe formations such as such as electronic expansion valve.

2 opening and closing device 63(opening and closing device 63a, opening and closing device 63b) formed by two-port valve etc.,Be used for opening and closing refrigerant piping 401. Opening and closing device 63a is located at the entrance side of heat source side cold-producing mediumRefrigerant piping 401 on. Opening and closing device 63b be located at the entrance side of heat source side cold-producing medium andOn the pipe arrangement that the refrigerant piping 401 of outlet side couples together. 2 flow passage selector device 64(streamsCircuit switching device 64a, flow passage selector device 64b) formed by cross valve etc., according to operation mode,Switch flowing of heat source side cold-producing medium. The heat source side of flow passage selector device 64a in the time of cooling operationIn the flowing of cold-producing medium, be located at the downstream of heat exchanger 61a between thermal medium. Flow passage selector deviceIn the flowing of the heat source side cold-producing medium of 64b in the time of full cooling operation, be located at heat exchanger between thermal mediumThe downstream of 61b.

As 2 pump 71(71a, 71b of thermal medium carrying device), make by pipe arrangement 500Thermal medium circulation. Pump 71a is located at heat exchanger 61a and the 2nd thermal medium stream between thermal mediumOn pipe arrangement 500 between switching device shifter 73. Pump 71b is located at heat exchanger 61b between thermal mediumAnd on the pipe arrangement 500 between the 2nd heat medium flow circuit switching device 73. 2 pumps 71 can be by exampleAs formations such as the controllable pumps of capacity.

4 the 1st heat medium flow circuit switching device 72(the 1st heat medium flow circuit switching device 72a～The 1st heat medium flow circuit switching device 72d) formed by triple valve etc., for switching thermal mediumStream. The 1st heat medium flow circuit switching device 72 is provided with corresponding with the setting of numbers of indoor set 50Number (being 4 here). The 1st heat medium flow circuit switching device 72 is located at load side heat and hands overThe outlet side of the thermal medium stream of parallel operation 51, heat exchanger between in its threeway and thermal medium61a connects, in threeway one with thermal medium between heat exchanger 61b be connected, one in threewayIndividually be connected with heat medium flow amount adjusting apparatus 74. In addition, with indoor set 50 accordingly, in figure,From below, be expressed as successively the 1st heat medium flow circuit switching device 72a, the 1st heat medium flowCircuit switching device 72b, the 1st heat medium flow circuit switching device 72c, the 1st thermal medium stream switchDevice 72d.

4 the 2nd heat medium flow circuit switching device 73(the 2nd heat medium flow circuit switching device 73a～The 2nd heat medium flow circuit switching device 73d) formed by triple valve etc., for switching thermal mediumStream. The 2nd heat medium flow circuit switching device 73 is provided with corresponding with the setting of numbers of indoor set 50Number (being 4 here). The 2nd heat medium flow circuit switching device 73 is located at load side heat and hands overThe entrance side of the thermal medium stream of parallel operation 51, heat exchanger between in its threeway and thermal medium61a connects, in threeway one with thermal medium between heat exchanger 61b be connected, one in threewayIndividually be connected with load side heat exchanger 51. In addition, with indoor set 50 accordingly, in figure, fromRise below, is expressed as successively the 2nd heat medium flow circuit switching device 73a, the 2nd thermal medium streamSwitching device shifter 73b, the 2nd heat medium flow circuit switching device 73c, the 2nd thermal medium stream switch dressPut 73d.

4 heat medium flow amount adjusting apparatus 74(heat medium flow amount adjusting apparatus 74a～thermal mediumsFlow adjuster 74d) formed by the two-port valve that can control aperture area etc., for being controlled atMobile flow in pipe arrangement 500. Heat medium flow amount adjusting apparatus 74 is provided with indoor set 50The corresponding number of setting of numbers (being 4 here). Heat medium flow amount adjusting apparatus 74 is located at negativeThe outlet side of the thermal medium stream of lotus side heat exchanger 51, a side and load side heat exchanger 51Connect, the opposing party is connected with the 1st heat medium flow circuit switching device 72. In addition, with indoor set50 accordingly, in figure, from below, be expressed as successively heat medium flow amount adjusting apparatus 74a,Heat medium flow amount adjusting apparatus 74b, heat medium flow amount adjusting apparatus 74c, thermal medium flow are adjustedDevice 74d. In addition, also heat medium flow amount adjusting apparatus 74 can be located to load side heat exchangeThe entrance side of the thermal medium stream of device 51.

In thermal medium transcriber 60, be provided with various checkout gears (2 the 1st temperature sensors81,82,4 the 3rd temperature sensors 83 of 4 the 2nd temperature sensors and pressure sensor 84).The detection signal of these checkout gears is sent to for example control device 40A, for controlling compressorThe switching of 1 driving frequency, the rotating speed of pressure fan (not shown), flow passage selector device 2,The switching of the driving frequency of pump 71, the switching of flow passage selector device 64, thermal medium stream etc.

2 the 1st temperature sensor 81(the 1st temperature sensor 81a, the 1st temperature sensor81b) for detection of the thermal medium flowing out from heat exchanger between thermal medium 61, hot between thermal mediumThe temperature of the thermal medium in the exit of interchanger 61, can be made up of such as thermistor etc. The1 temperature sensor 81a is located on the pipe arrangement 500 of entrance side of pump 71a. The 1st TEMPDevice 81b is located on the pipe arrangement 500 of entrance side of pump 71b.

4 the 2nd temperature sensor 82(the 2nd temperature sensor 82a～2nd temperature sensors82d) be located between the 1st heat medium flow circuit switching device 72 and heat medium flow amount adjusting apparatus 74,For detection of the temperature of the thermal medium flowing out from load side heat exchanger 51, can be by thermistor etc.Form. The 2nd temperature sensor 82 is provided with number (this corresponding with the setting of numbers of indoor set 50In be 4). In addition, with indoor set 50 accordingly, in figure, from below, successively representBe the 2nd temperature sensor 82a, the 2nd temperature sensor 82b, the 2nd temperature sensor 82c,The 2nd temperature sensor 82d.

4 the 3rd temperature sensor 83(the 3rd temperature sensor 83a～3rd temperature sensors83d) be located at entrance side or the outlet side of the heat source side cold-producing medium of heat exchanger 61 between thermal medium,For detection of flowing into the temperature of the heat source side cold-producing medium of heat exchanger 61 between thermal medium or being situated between from heatThe temperature of the heat source side cold-producing medium that between matter, heat exchanger 61 flows out, can be made up of thermistor etc.The 3rd temperature sensor 83a is located at heat exchanger 61a and flow passage selector device 64a between thermal mediumBetween. The 3rd temperature sensor 83b is located at heat exchanger 61a and throttling arrangement 62a between thermal mediumBetween. The 3rd temperature sensor 83c is located at heat exchanger 61b and stream switching dress between thermal mediumPut between 64b. The 3rd temperature sensor 83d is located at heat exchanger 61b and throttling between thermal mediumBetween device 62b.

Pressure sensor 84, with the setting position of the 3rd temperature sensor 83d similarly, be located atBetween thermal medium between heat exchanger 61b and throttling arrangement 62b, for detection of heat between thermal mediumThe pressure of mobile heat source side cold-producing medium between interchanger 61b and throttling arrangement 62b.

The pipe arrangement 500 of thermal medium conducting by with thermal medium between the pipe arrangement that is connected of heat exchanger 61a andForm with the pipe arrangement that between thermal medium, heat exchanger 61b is connected. Pipe arrangement 500 is according to becoming with thermal mediumChange planes 60 connections indoor set 50 number of units and be branched (being to be divided into each 4) here. Pipe arrangement500 connect at the 1st heat medium flow circuit switching device 72 and the 2nd heat medium flow circuit switching device 73Connect. By to the 1st heat medium flow circuit switching device 72 and the 2nd heat medium flow circuit switching device73 control, and deciding is to make to flow into negative from the thermal medium of heat exchanger 61a between thermal mediumLotus side heat exchanger 51, still make to flow into from the thermal medium of heat exchanger 61b between thermal medium negativeLotus side heat exchanger 61a.

In aircondition 102, compressor 1, flow passage selector device 2, heat source side heat exchanger3, the cold-producing medium of heat exchanger 61 stream between opening and closing device 63, flow passage selector device 64, thermal mediumRoad, throttling arrangement 62 and reservoir 65, connected by refrigerant piping 401, formed refrigerationAgent closed circuit A. In addition, the thermal medium stream of heat exchanger 61 between thermal medium, pump 71,The 1st heat medium flow circuit switching device 72, heat medium flow amount adjusting apparatus 74, load side heat exchangeDevice 51 and the 2nd heat medium flow circuit switching device 73, connected by pipe arrangement 500, formed hot JieMatter closed circuit B. , many load side heat exchangers 51 in parallel and between each thermal medium heat hand overParallel operation 61 connects, and thermal medium closed circuit B is formed as to multisystem.

Therefore,, in aircondition 102, off-premises station 40 and thermal medium transcriber 60 are via establishingHeat exchanger between heat exchanger 61a and thermal medium between the thermal medium in thermal medium transcriber 6061b connects, and thermal medium transcriber 60 and indoor set 50 are also via heat exchanger 61a between thermal mediumBe connected with heat exchanger 61b between thermal medium. ,, in aircondition 102, follow at cold-producing mediumThe heat source side cold-producing medium circulating in loop back path A and the heat circulating in thermal medium closed circuit B are situated betweenMatter, at heat exchanger 61b between heat exchanger 61a and thermal medium between thermal medium, carries out heat exchange.

This aircondition 102 can be according to the instruction from each indoor set 50, utilize this indoor set50 carry out cooling operation or heat running. , aircondition 102 can make whole indoor sets50 carry out identical running, and, can make each indoor set 50 carry out not identical running.

Aircondition 102, can carry out by the indoor set 50 driving and all carry out the complete of cooling operationCooling operation pattern, by the indoor set 50 driving all carry out heat running entirely heat operational modeThe refrigeration main body operation mode that formula, cooling load are larger and heat load larger heat main bodyOperation mode.

As mentioned above, according to embodiment 3, even if can freeze and heating type simultaneouslyIn aircondition, also with embodiment 1 and embodiment 2 similarly, can be by low-pressure gasThe pipe arrangement diameter of pipe arrangement reduces 1～2 rank. As a result, can reduce pipe arrangement cost and construction cost,And, can reduce the energy loss causing because of discarded, be conducive to environmental protection. In addition, byIn reducing the pressure loss, so, can carry out the running that efficiency is high, also can obtain energy-saving effect.

In addition, thermal medium transcriber 60 also can separately be configured to and have gas-liquid separator and throttlingMain thermal medium transcriber and the sub-thermal medium transcriber of device.

The explanation of Reference numeral

1 ... compressor, 2 ... flow passage selector device, 3 ... heat source side heat exchanger, 4 ... supercoolingHeat exchanger, 5 ... throttling arrangement, 6 ... reservoir, 7 ... bypass circulation, 8 ... pressure sensor,9 ... temperature sensor, 10 ... off-premises station, 10A ... control device, 20(20a～20d) ... chamberInterior machine, 21(21a～21d) ... utilize side heat exchanger, 22(22a～22d) ... throttling dressPut 23a～23d ... temperature sensor, 24a～24d ... temperature sensor, 30 ... off-premises station,30A ... control device, 31 ... compressor, 32 ... condenser, 33 ... throttling arrangement, 34 ... crossCooling heat exchanger, 40 ... off-premises station, 40A ... control device, 41a～41d ... check valve,42a ... the 1st connecting pipings, 42b ... the 2nd connecting pipings, 50(50a～50d) ... indoor set,51(51a～51d) ... load side heat exchanger, 60 ... thermal medium transcriber, 61(61a, 61b)Heat exchanger between thermal medium, 62(62a, 62b) ... throttling arrangement, 63(63a, 63b)Opening and closing device, 64(64a, 64b) ... flow passage selector device, 71(71a, 71b) ... pump,72(72a～72d) ... the 1st heat medium flow circuit switching device, 73(73a～73d) ... the 2ndHeat medium flow circuit switching device, 74(74a～74d) ... heat medium flow amount adjusting apparatus, 81(81a,81b) ... the 1st temperature sensor, 82(82a～84d) ... the 2nd temperature sensor, 83(83a～83d) ... the 3rd temperature sensor, 84 ... pressure sensor, 100 ... aircondition, 101 ... emptyAdjust device, 101A ... refrigerant loop, 101B ... loop, 102 are used in supercooling ... aircondition,400(400a, 400b) ... extend pipe arrangement, 401 ... refrigerant piping, 500 ... pipe arrangement, ARefrigerant circulation loop, B ... thermal medium closed circuit

Claims

1. an aircondition, is characterized in that, has:

Refrigerant circulation loop, connects compressor, heat source side heat exchanger, first segment with pipe arrangementFlow device and utilize side heat exchanger, the saturated refrigerant gas density 0 DEG C time is R410A system35～65% cold-producing medium of cryogen circulates in this refrigerant circulation loop; And

Supercooling mechanism, in the time of cooling operation, makes to deliver to above-mentioned from above-mentioned heat source side heat exchangerThe liquid temperature of the high pressure liquid refrigerant of first throttle device is below 5 DEG C,

Above-mentioned supercooling mechanism is between above-mentioned heat source side heat exchanger and above-mentioned first throttle deviceHave supercooling heat exchanger, above-mentioned supercooling heat exchanger makes to be positioned at above-mentioned heat source side heat exchangeHigh-pressure side cold-producing medium between device and above-mentioned first throttle device with by above-mentioned high-pressure side cold-producing mediumThe post-decompression low-pressure side cold-producing medium of a part carries out heat exchange, by above-mentioned high-pressure side refrigerant cools,

Above-mentioned supercooling mechanism has bypass circulation, and this bypass circulation is from above-mentioned supercooling heat exchangePipe arrangement branch between device and above-mentioned first throttle device, via the second throttling arrangement and above-mentioned mistakeThe low-pressure side of cooling heat exchanger is connected to the entrance side of reservoir,

In the time of cooling operation, adjust the aperture of above-mentioned the second throttling arrangement, make above-mentioned supercooling heatThe liquid temperature of the high pressure liquid refrigerant of the outlet of interchanger is below 5 DEG C.

2. aircondition as claimed in claim 1, is characterized in that, above-mentioned supercooling mechanismThe degree of supercooling that makes above-mentioned high pressure liquid refrigerant is more than 44 DEG C.

3. aircondition as claimed in claim 1 or 2, is characterized in that, is heating runningTime, make the highly pressurised liquid refrigeration of utilizing side heat exchanger to deliver to above-mentioned first throttle device from above-mentionedThe liquid temperature of agent is below 5 DEG C or makes degree of supercooling is more than 44 DEG C.

4. aircondition as claimed in claim 1, is characterized in that, above-mentioned supercooling heat is handed overParallel operation is Double-wall-tube heat exchanger, makes high-pressure side cold-producing medium make low-pressure side in annulus circulationCold-producing medium circulates in inner tube.

5. aircondition as claimed in claim 1, is characterized in that, above-mentioned supercooling heat is handed overParallel operation is heat-exchangers of the plate type, above-mentioned high-pressure side cold-producing medium is flowed from top to bottom and make above-mentioned low pressureSide cold-producing medium flows from the bottom up.

6. aircondition as claimed in claim 1 or 2, is characterized in that, above-mentioned cold-producing mediumUse HFO1234yf or HFO1234ze.

7. aircondition as claimed in claim 1 or 2, is characterized in that,

Above-mentioned refrigerant circulation loop has between multiple thermal mediums heat exchanger as the above-mentioned side of utilizingHeat exchanger, between above-mentioned thermal medium, heat exchanger makes above-mentioned cold-producing medium and is different from above-mentioned cold-producing mediumThermal medium carry out heat exchange and can heat exchange become the thermal medium of different temperatures;

Also have and connect multiple pumps, load side heat exchanger and thermal medium stream switches dress with pipe arrangementThe thermal medium closed circuit of putting and form;

Above-mentioned multiple pump makes respectively heat exchanger between above-mentioned multiple thermal mediums carry out the upper of heat exchangeState thermal medium circulation;

Above-mentioned load side heat exchanger makes the air of above-mentioned thermal medium and air-conditioning object space carry out heatExchange;

Above-mentioned heat medium flow circuit switching device, to by heat exchanger between above-mentioned multiple thermal mediumsThermal medium switches, and makes it flow to above-mentioned load side heat exchanger.