CN103415749B - Binary refrigeration cycle device - Google Patents

Binary refrigeration cycle device Download PDF

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Publication number
CN103415749B
CN103415749B CN201280012473.2A CN201280012473A CN103415749B CN 103415749 B CN103415749 B CN 103415749B CN 201280012473 A CN201280012473 A CN 201280012473A CN 103415749 B CN103415749 B CN 103415749B
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China
Prior art keywords
heat exchanger
utilize
refrigeration cycle
high temperature
heat
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CN201280012473.2A
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CN103415749A (en
Inventor
高山司
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Toshiba Carrier Corp
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Toshiba Carrier Corp
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Classifications

    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F24D19/1021—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves a by pass valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
    • F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/227—Temperature of the refrigerant in heat pump cycles
    • F24H15/232—Temperature of the refrigerant in heat pump cycles at the condenser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/258—Outdoor temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/385—Control of expansion valves of heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/027—Condenser control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/12—Heat pump
    • F24D2200/123—Compression type heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/375—Control of heat pumps
    • F24H15/38—Control of compressors of heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • 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
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

Binary refrigeration cycle device has: possess and absorb the heat source side heat exchanger of heat and the low temperature side kind of refrigeration cycle of low temperature side compressor from external heat source; Possesses the high temperature side kind of refrigeration cycle utilizing side heat exchanger and high temperature side compressor to utilizing side to supply heat; Make the intermediate heat exchanger of the cold-producing medium generation heat exchange of described low temperature side kind of refrigeration cycle and described high temperature side kind of refrigeration cycle; The described housing utilizing side heat exchanger is at least installed; Be configured at described housing, be connected with the described side heat exchanger that utilizes, make circulation utilize the cold-producing medium generation heat exchange of side liquid and high temperature side kind of refrigeration cycle after be supplied to utilize side utilize side ducts; Be connected in parallel in utilizing side heat exchanger and describedly utilize side ducts, make to utilize side ducts utilize heat exchanger outlet side, side utilize side liquid to send to flow to the bypass channel utilizing heat exchanger entrance side, side; And, control the flow control unit utilizing side liquid to flow circulated in described bypass channel.

Description

Binary refrigeration cycle device
Technical field
Embodiments of the present invention relate to binary refrigeration cycle device.
Background technology
On the refrigerating circulatory device such as air regulator, Teat pump boiler, in order to heat utilization machine supplying high temperature heat, sometimes can use the binary refrigeration cycle device possessing low temperature side kind of refrigeration cycle and high temperature side kind of refrigeration cycle.
The low temperature side kind of refrigeration cycle of binary refrigeration cycle device and high temperature side kind of refrigeration cycle, have compressor, expansion gear etc. separately, connected in the mode can carrying out heat exchange by intermediate heat exchanger.Then, make the heat drawn as the heat source side heat exchanger of low temperature side evaporimeter by low temperature side kind of refrigeration cycle is arranged, utilize side heat exchanger via what high temperature side kind of refrigeration cycle was arranged as high temperature side condenser, the heat of high temperature is supplied to heat utilization machine.
Prior art document
Patent document
[patent document 1] Japanese Unexamined Patent Publication 08-189714 publication
Summary of the invention
[problem to be addressed by invention]
But, as everyone knows, utilize the temperature of (utilizing side) fluid of side heat exchanger lower if flowed into from heat utilization device, then the compression ratio of high temperature side kind of refrigeration cycle can decline, the reliability of compressor also can decline, and meanwhile the reliability of refrigerating circulatory device itself can reduce.
The present invention proposes for solving the problem, and according to the embodiment of the present invention, provides a kind of reliability decrease problem solving compressor, and then solves the binary refrigeration cycle device of reliability decrease problem of refrigerating circulatory device.
[solving the unit of problem]
The binary refrigeration circulatory system that embodiments of the present invention relate to comprises: low temperature side kind of refrigeration cycle, and described low temperature side kind of refrigeration cycle comprises the heat source side heat exchanger and the low temperature side compressor that absorb heat from external heat source, high temperature side kind of refrigeration cycle, described high temperature side kind of refrigeration cycle comprise to utilize side supply heat utilize side heat exchanger and high temperature side compressor, intermediate heat exchanger, heat-shift between the cold-producing medium of described intermediate heat exchanger in described low temperature side kind of refrigeration cycle and the cold-producing medium in described high temperature side kind of refrigeration cycle, housing, at least described side heat exchanger that utilizes is installed to described housing, utilize side ducts, be arranged at described housing, and be connected to and describedly utilize side heat exchanger, so as between the cold-producing medium utilizing in side liquid and high temperature side kind of refrigeration cycle of circulation heat-shift, and described heat be fed to describedly utilize side, bypass channel, described bypass channel and describedly utilize side heat exchanger to be parallel-connected to describedly to utilize side ducts, to utilize the described side liquid that utilizes in side ducts to utilize heat exchanger entrance side, side from utilizing heat exchanger outlet side, side to be fed to by described, and flow control unit, described flow control unit controls the described flowing utilizing side liquid of circulating in described bypass channel, wherein, described flow control unit comprise detect flow into described utilize side heat exchanger described utilize the temperature of side liquid utilize side liquid temperature detecting unit, be arranged on described heat source side heat exchanger to detect the external heat source temperature detecting unit of the temperature of described external heat source, and change the flow control valve of the flow in described bypass channel, and control described flow control unit, when being equal to or less than predetermined value with the difference between the described temperature of the described described described external heat source utilizing the described temperature of side liquid and described external heat source temperature detecting unit to detect utilizing side liquid temperature detecting unit to detect of box lunch, open described flow control valve.
The binary refrigeration circulatory system that embodiments of the present invention relate to comprises: low temperature side kind of refrigeration cycle, and described low temperature side kind of refrigeration cycle comprises the heat source side heat exchanger and the low temperature side compressor that absorb heat from external heat source, high temperature side kind of refrigeration cycle, described high temperature side kind of refrigeration cycle comprise to utilize side supply heat utilize side heat exchanger and high temperature side compressor, intermediate heat exchanger, heat-shift between the cold-producing medium of described intermediate heat exchanger in described low temperature side kind of refrigeration cycle and the cold-producing medium in described high temperature side kind of refrigeration cycle, housing, at least described side heat exchanger that utilizes is installed to described housing, utilize side ducts, be arranged at described housing, and be connected to and describedly utilize side heat exchanger, so as between the cold-producing medium utilizing in side liquid and high temperature side kind of refrigeration cycle of circulation heat-shift, and described heat be fed to describedly utilize side, bypass channel, described bypass channel and describedly utilize side heat exchanger to be parallel-connected to describedly to utilize side ducts, to utilize the described side liquid that utilizes in side ducts to utilize heat exchanger entrance side, side from utilizing heat exchanger outlet side, side to be fed to by described, and flow control unit, described flow control unit controls the described flowing utilizing side liquid of circulating in described bypass channel, wherein, described flow control unit comprises the refrigerant temperature detecting unit detecting the temperature flowing into the described described cold-producing medium utilized in the described high temperature side kind of refrigeration cycle of side heat exchanger, and change the flow control valve of the flow in described bypass channel, and when the condensation temperature of the described cold-producing medium in the described high temperature side kind of refrigeration cycle that described refrigerant temperature detecting unit detects is lower than predetermined temperature, described flow control unit controls, to increase the aperture of described flow control valve.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the binary refrigeration cycle device that embodiments of the present invention relate to.
Fig. 2 is the block diagram of the controller that relates to of embodiments of the present invention and Zhou side machine thereof.
Fig. 3 is the flow chart of the control that embodiments of the present invention relate to.
Detailed description of the invention
Below, accompanying drawing is used to be described embodiments of the present invention.
(the 1st embodiment)
Fig. 1 is used to be described the 1st embodiment.
As shown in Figure 1, low temperature side kind of refrigeration cycle 6a, the high temperature side kind of refrigeration cycle 6b of the binary refrigeration cycle device 100 of this embodiment are formed in the mode can carrying out heat exchange by intermediate heat exchanger 5.
Binary refrigeration cycle device 100 has the 1st housing 8a and the 2nd housing 8b.
Is connected with successively by refrigerant tubing in 1st housing 8a: low temperature side compressor 1a, the low temperature side cross valve 2a be connected with low temperature side compressor 1a by refrigerant tubing, and the air (external heat source) of outside carry out heat source side heat exchanger 3, the low temperature side expansion gear 4a of heat exchange.In addition, low temperature side cross valve 2a and low temperature side expansion gear 4a, is connected with communicating pipe 9a, 9b separately, this communicating pipe 9a, 9b intermediate heat exchanger 5 of being located at the 2nd housing 8b connect.
Heat source side heat exchanger 3 is provided with air blast 11, in order to promote the heat exchange with extraneous air.In addition, heat source side heat exchanger 3 is provided with the external air temperature sensor 16 as external heat source temperature detecting unit, in order to detect the temperature of the extraneous air being supplied to heat source side heat exchanger 3 by air blast 11.
In the 2nd housing 8b, be connected with high temperature side compressor 1b, the high temperature side cross valve 2b be connected with high temperature side compressor 1b, intermediate heat exchanger 5, high temperature side expansion gear 4a in turn by refrigerant tubing, utilize side heat exchanger 7, form high temperature side kind of refrigeration cycle 6b.
Utilizing the entrance side of refrigerant tubing and the outlet side of side heat exchanger 7, be provided with high temperature side refrigerant temperature sensors 17a, the 17b as refrigerant temperature detecting unit, utilize the refrigerant temperature of side heat exchanger 7 and the refrigerant temperature of outflow in order to detect to flow into.
Here, intermediate heat exchanger 5 is connected with filler valve 21a, the 21b that can be connected with communicating pipe 9a, 9b, this filler valve 21a, 21b are upper owing to being connected with communicating pipe 9a, 9b and form low temperature side kind of refrigeration cycle 6a, can carry out heat exchange via intermediate heat exchanger 5 low temperature side kind of refrigeration cycle 6a and high temperature side kind of refrigeration cycle 6b.
In low temperature side kind of refrigeration cycle 6a and high temperature side kind of refrigeration cycle 6b, be packaged with the cold-producing medium of different qualities separately.
The kind of the cold-producing medium of encapsulation is different according to the purposes of binary refrigeration cycle device 100, such as, utilize side heat exchanger 7 as water heat exchanger in order to produce the high-temperature heat-pump water-heater of hot water of 90 DEG C nearly when, the low temperature side cold-producing medium used in low temperature side kind of refrigeration cycle 6a is preferably similar R410A's, even if also there is the circulating refrigerant of superperformance under low outer temperature (about-15 DEG C), the high temperature side refrigerant used in high temperature side kind of refrigeration cycle 6b is preferably similar R134a's, also there is the circulating refrigerant of superperformance under high temperature (about 95 DEG C).
Utilize side heat exchanger 7 is connected with and utilize side liquid pipeline 18, this utilizes the purposes of side liquid pipeline 18 to be the heat drawn by binary refrigeration cycle device 100 is supplied to the heat utilization machine utilizing this heat.
Side ducts 18 is utilized to have with connector body 23a, 23b of heat utilization equipment connection and will the stream utilizing side liquid stream to send in side liquid pipeline 18 be utilized to send pump 10.Connector body 23a, entrance side branch 12a, send stream pump 10, utilize side heat exchanger 7, outlet side branch 12b and connector body 23b successively by utilizing side ducts 18 to be connected.
Further, entrance side branch 12a is directly connected by bypass channel 13 with outlet side branch 12b, relative to utilizing side ducts 18, bypass channel 13 with utilize side heat exchanger 7 to be connected in parallel.The middle part of bypass channel 13 is provided with flow control valve 14.
Flow control unit in this embodiment by the aperture of control flow check control valve 14, thus controls the flow utilizing side liquid of circulation in bypass channel 13.
When making to utilize side liquid to flow, at entrance side branch 12a with utilize the stream pump 10 that send arranged between side heat exchanger 7 to come into operation, flow through entrance side branch 12a successively from connector body 23a, utilize side heat exchanger 7, outlet side branch 12b flow to connector body 23b by utilizing side liquid to send.Utilize side liquid flow direction as shown by the dotted arrow in figure 1.
Due to entrance side branch 12a with utilize to be provided with between side heat exchanger 7 and send stream pump 10.Therefore, the flow direction of side liquid that utilizes in the bypass channel 13 when flow control valve 14 is opened is the direction flowing to entrance side branch 12a from outlet side branch 12b.In addition, entrance side branch 12a, outlet side branch 12b, send stream pump 10, bypass channel 13 to be installed on the 2nd housing 8b.
Utilizing sending stream pump 10 and utilizing in the interval between side heat exchanger 7 cooling-water temperature sensor 15 be provided with as utilizing side liquid temperature detecting unit of side liquid pipeline 18, in order to detect the temperature utilizing side liquid flowing into and utilize side heat exchanger 7.
Utilize in side liquid pipeline 18 and be packaged with to the warm water of heat utilization machine heat supply or salt solution etc. in the mode that can circulate.
External air temperature sensor 16, high temperature side refrigerant temperature sensors 17a, 17b and cooling-water temperature sensor 15 are connected with controller 23, in order to detect outdoor temperature, high temperature side kind of refrigeration cycle refrigerant temperature and flow into utilize the warm water of side heat exchanger 7 or salt solution etc. to utilize the temperature of side liquid.
2nd housing 8b possesses the electrical box 22 controlling binary refrigeration cycle device 100 and operate.
Electrical box 22 possesses: not shown driving low temperature side compressor 1a and the inverter circuit of high temperature side driven compressor 1b; Control the controller 23 of the switching of the aperture of low temperature side expansion gear 4 and high temperature side expansion gear 10, low temperature side cross valve and high temperature side cross valve 9.Due to these inverter circuits and controller 23, control low temperature side kind of refrigeration cycle 7 and high temperature side kind of refrigeration cycle 13 are able to run under optimal service condition.
Binary refrigeration cycle device 100 heats the flow process of cold-producing medium when running as shown in the solid arrow of Fig. 1.
First, in low temperature side kind of refrigeration cycle 7, low temperature side cold-producing medium successively by low temperature side cross valve 2, the low temperature side stream of intermediate heat exchanger 5, low temperature side expansion gear 4a and heat source side heat exchanger 3, then returns low temperature side compressor 1a from low temperature side cross valve 2 from low temperature side compressor 1a.Equally, in high temperature side kind of refrigeration cycle 6b, the high temperature side cold-producing medium compressed via high temperature side compressor 1b, successively by high temperature side cross valve 2b, the high temperature side stream utilizing side heat exchanger 7, high temperature side expansion gear 4b and intermediate heat exchanger 5, then returns high temperature side compressor 1b from high temperature side cross valve 2b.
At this moment, low temperature side cold-producing medium is evaporated by heat source side heat exchanger 3, and condenses at the low temperature side of intermediate heat exchanger 5.In addition, high temperature side cold-producing medium is utilizing condensation in side heat exchanger 7, and by warm be supplied to utilize side utilize warm water in side ducts 18 or salt solution, at the high temperature side stream of intermediate heat exchanger 5, the aqueous cold-producing medium evaporation will reduced pressure by high temperature side expansion gear 4b, and the heat of condensation absorbing low temperature side cold-producing medium is as heat of evaporation.
Flowing in side ducts 18 is utilized to have by sending stream pump 10 to be utilized side liquid by what send stream.
At this, if flow into utilize side heat exchanger 7 utilize the temperature of side liquid obviously very low, then utilize the temperature of the high temperature side cold-producing medium of side heat exchanger 7 to become lower than set point of temperature Tb1, the compression ratio of high temperature side compressor 1b can decline.If run compressor under the state that compression ratio declines, the reliability of compressor can decline to some extent.
On the controller 23 arranged in the electrical box 22 of binary refrigeration cycle device 100, as shown in the block diagram of Fig. 2, be connected with cooling-water temperature sensor 15, external air temperature sensor 16, high temperature side refrigerant temperature sensors 17a, 17b and flow control valve 14.
If utilize the temperature of side liquid lower from heat utilization machine to what utilize side heat exchanger 7 to supply, then the flow control valve 14 of bypass channel 13 is opened, make to utilize side liquid to send from outlet side branch 12b via bypass channel 13 to flow to entrance side branch 12a from what utilize side heat exchanger 7 to flow out, again utilize the side liquid that utilizes of side heat exchanger 7 to mix with flowing into from connector body 23a, make it to utilize side liquid to flow into utilize side heat exchanger 7 as medium temperature.
Secondly, about the control of controller 23 for flow control valve 14, the flow chart with reference to Fig. 3 is described.
First, in the operation of binary refrigeration cycle device 100, the judgement (step S201) that controller 23 will carry out is: the outdoor temperature T0 that external air temperature sensor 16 detects be arranged on utilize the entrance side of side heat exchanger 7 utilize side liquid temperature sensor detect 15 detect utilize the difference of the temperature Tw of side liquid (Tw-T0) with no at below set point of temperature Ta.
At this, if the outdoor temperature T0 detected and the temperature Ta large (step S201's is no) utilizing the temperature difference ratio of the temperature Tw of side liquid to specify, then the flow control valve 14 of bypass channel 13 cuts out (step S205), and what flow out from utilizing side heat exchanger 7 utilizes side liquid all to be sent to flow to heat utilization machine.
On the other hand, if the outdoor temperature T0 detected and utilize the temperature difference of the temperature Tw of side liquid below set point of temperature Ta (step S201 is), then the flow control valve 14 of bypass channel 13 is with certain aperture open (step S202), flow out from utilizing side heat exchanger 7 utilize a part for side liquid by bypass channel 13 send flow to utilize side heat exchanger 7 utilize side liquid entrance.Therefore, mix with the side liquid that utilizes of the low temperature supplied by heat utilization machine from the side liquid that utilizes of the high temperature utilizing side heat exchanger 7 to flow out, become medium temperature and flow into and utilize side heat exchanger 7.
Then, calculate the inflow side and the high temperature side refrigerant temperature Ts1 of outflow side, the mean temperature of Ts2 that utilize side heat exchanger 7 that are detected by two high temperature side refrigerant temperature sensors 17a, 17b, using this mean temperature as the large approximate number of the adiabatic condensation temperature Ts of high temperature side cold-producing medium.Then, carry out whether set point of temperature Tb1 ~ Tb2(Tb1<Tb2 is in adiabatic condensation temperature Ts) scope in judgement (step S203, S204).
Namely, judge that whether the adiabatic condensation temperature Ts of high temperature side cold-producing medium is at more than Tb1 (step S203), if the adiabatic condensation temperature Ts of high temperature side cold-producing medium lower than Tb1 (step S203's is no), then increase the aperture (step S206) of flow control valve 14, then, step S203 is returned.
On the other hand, when the adiabatic condensation temperature Ts of high temperature side cold-producing medium is at more than Tb1 (step S203 is), then judge whether the adiabatic condensation temperature Ts of high temperature side cold-producing medium is in below Tb2 (step S204).If the adiabatic condensation temperature Ts of high temperature side cold-producing medium higher than Tb2 (step S204's is no), then the aperture of flow control valve 14 is made to reduce (step S207) and return step S203.
After this, if in the scope utilizing the adiabatic condensation temperature Ts of the high temperature side cold-producing medium of side heat exchanger 7 to be in set point of temperature Tb1 ~ Tb2 (step S203 be and step S204 be), then the aperture of flow control valve 14 continues to remain unchanged and returns step S201.
As mentioned above, according to the outside air temperature of external heat source with flow into the temperature difference utilizing side liquid temperature utilizing side heat exchanger, if when judging the temperature conditions meeting low compression ratio operation, flow control valve 14 is then made to open, to be supplied to utilize side heat exchanger 7 to utilize in side liquid mixing to heat after utilize side liquid, by making inflow utilize the temperature of side liquid that utilizes of side heat exchanger to raise, thus the temperature conditions becoming low compression ratio and run can be evaded.
And, by detecting the temperature of the high temperature side cold-producing medium utilized in side heat exchanger 7, determine whether that low compression ratio is run, and by controlling the aperture of the flow control valve 14 that bypass channel 13 is arranged, the temperature of side liquid that utilizes to utilizing side heat exchanger 7 to supply can be made to rise to the most applicable temperature avoiding low compression ratio to run.
By above-mentioned formation with control, the adiabatic condensation temperature utilizing side heat exchanger 7 can be suppressed to decline, thus suppress compression ratio to decline.Thereby, it is possible to prevent the compressor reliability caused due to low compression ratio state from declining, and then, can prevent the reliability of binary refrigeration cycle device 100 from reducing.
The same with above-mentioned embodiment, due to the 1st housing and the 2nd housing are separately formed binary refrigeration cycle device 100, so can be corresponding flexibly according to the state of installation site.Such as, when sufficient outdoor installation space can not be guaranteed, also the 1st housing with heat source side heat exchanger 3 can being configured in outdoor, utilizing the 2nd housing of side heat exchanger to be configured in indoor by having.
In addition, in the above-described embodiment, although low temperature side housing 8a and high temperature side housing 8b is for form respectively, being also not limited only to this, also can be the configuration possessing high temperature side kind of refrigeration cycle and low temperature side kind of refrigeration cycle in a housing.
In addition, in the above-described embodiment, although be the aperture that utilize the flow control unit of the flow of side liquid be set to flow control valve 14 of control flow check through bypass channel 13 controlled, other control unit can also be used.Such as, also can be in entrance side branch 12a and outlet side branch 12b, at least make one side be three-way valve, control the aperture of three-way valve as flow control valve.
The invention is not restricted to above-mentioned embodiment.In addition, can also be suitable by multiple inscape and form various invention disclosed in combination embodiment of the present invention.Such as, the several inscapes in all inscapes disclosed in embodiment of the present invention can also be deleted.Further, also can suitably combine from the inscape in different embodiments.
Symbol description
1a ... low temperature side compressor,
1b ... high temperature side compressor,
2a ... low temperature side cross valve,
2b ... high temperature side cross valve,
3 ... heat source side heat exchanger,
4a ... low temperature side expansion gear,
4b ... high temperature side expansion gear,
5 ... intermediate heat exchanger,
6a ... low temperature side kind of refrigeration cycle,
6b ... high temperature side kind of refrigeration cycle,
7 ... utilize side heat exchanger,
8a ... low temperature side housing,
8b ... high temperature side housing,
9a, 9b ... communicating pipe,
10 ... send stream pump,
12a ... entrance side branch,
12b ... outlet side branch,
13 ... bypass channel,
22 ... electrical box,
15 ... utilize side temperature detecting unit,
16 ... outside air temperature sensor,
17a, b17 ... high temperature side refrigerant temperature sensors,
18 ... utilize side ducts,
100 ... binary refrigeration cycle device

Claims (2)

1. a binary refrigeration circulatory system, comprising:
Low temperature side kind of refrigeration cycle, described low temperature side kind of refrigeration cycle comprises the heat source side heat exchanger and the low temperature side compressor that absorb heat from external heat source;
High temperature side kind of refrigeration cycle, described high temperature side kind of refrigeration cycle comprise to utilize side supply heat utilize side heat exchanger and high temperature side compressor;
Intermediate heat exchanger, heat-shift between the cold-producing medium of described intermediate heat exchanger in described low temperature side kind of refrigeration cycle and the cold-producing medium in described high temperature side kind of refrigeration cycle;
Housing, at least described side heat exchanger that utilizes is installed to described housing;
Utilize side ducts, be arranged at described housing, and be connected to and describedly utilize side heat exchanger, so as between the cold-producing medium utilizing in side liquid and high temperature side kind of refrigeration cycle of circulation heat-shift, and described heat be fed to describedly utilize side;
Bypass channel, described bypass channel and describedly utilize side heat exchanger to be parallel-connected to describedly to utilize side ducts, to utilize the described side liquid that utilizes in side ducts to utilize heat exchanger entrance side, side from utilizing heat exchanger outlet side, side to be fed to by described; And
Flow control unit, described flow control unit controls the described flowing utilizing side liquid of circulating in described bypass channel,
It is characterized in that, wherein, described flow control unit comprise detect flow into described utilize side heat exchanger described utilize the temperature of side liquid utilize side liquid temperature detecting unit, be arranged on described heat source side heat exchanger to detect the external heat source temperature detecting unit of the temperature of described external heat source, and change the flow control valve of the flow in described bypass channel, and control described flow control unit, when being equal to or less than predetermined value with the difference between the described temperature of the described described described external heat source utilizing the described temperature of side liquid and described external heat source temperature detecting unit to detect utilizing side liquid temperature detecting unit to detect of box lunch, open described flow control valve.
2. a binary refrigeration circulatory system, comprising:
Low temperature side kind of refrigeration cycle, described low temperature side kind of refrigeration cycle comprises the heat source side heat exchanger and the low temperature side compressor that absorb heat from external heat source;
High temperature side kind of refrigeration cycle, described high temperature side kind of refrigeration cycle comprise to utilize side supply heat utilize side heat exchanger and high temperature side compressor;
Intermediate heat exchanger, heat-shift between the cold-producing medium of described intermediate heat exchanger in described low temperature side kind of refrigeration cycle and the cold-producing medium in described high temperature side kind of refrigeration cycle;
Housing, at least described side heat exchanger that utilizes is installed to described housing;
Utilize side ducts, be arranged at described housing, and be connected to and describedly utilize side heat exchanger, so as between the cold-producing medium utilizing in side liquid and high temperature side kind of refrigeration cycle of circulation heat-shift, and described heat be fed to describedly utilize side;
Bypass channel, described bypass channel and describedly utilize side heat exchanger to be parallel-connected to describedly to utilize side ducts, to utilize the described side liquid that utilizes in side ducts to utilize heat exchanger entrance side, side from utilizing heat exchanger outlet side, side to be fed to by described; And
Flow control unit, described flow control unit controls the described flowing utilizing side liquid of circulating in described bypass channel,
It is characterized in that, wherein, described flow control unit comprises to detect to flow into and describedly utilizes the refrigerant temperature detecting unit of the temperature of the described cold-producing medium in the described high temperature side kind of refrigeration cycle of side heat exchanger and change the flow control valve of the flow in described bypass channel, and when the condensation temperature of the described cold-producing medium in the described high temperature side kind of refrigeration cycle that described refrigerant temperature detecting unit detects is lower than predetermined temperature, described flow control unit controls, to increase the aperture of described flow control valve.
CN201280012473.2A 2011-03-09 2012-03-08 Binary refrigeration cycle device Active CN103415749B (en)

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EP2672204B1 (en) 2017-07-05
CN103415749A (en) 2013-11-27
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WO2012121326A1 (en) 2012-09-13
JPWO2012121326A1 (en) 2014-07-17

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