CN103998878A - Refrigeration apparatus and method - Google Patents
Refrigeration apparatus and method Download PDFInfo
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- CN103998878A CN103998878A CN201280058789.5A CN201280058789A CN103998878A CN 103998878 A CN103998878 A CN 103998878A CN 201280058789 A CN201280058789 A CN 201280058789A CN 103998878 A CN103998878 A CN 103998878A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005057 refrigeration Methods 0.000 title claims description 6
- 238000010257 thawing Methods 0.000 claims description 58
- 238000000429 assembly Methods 0.000 claims description 19
- 230000000712 assembly Effects 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 13
- 239000003507 refrigerant Substances 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004378 air conditioning Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 201000004792 malaria Diseases 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/10—Sensors measuring the temperature of the evaporator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
- F25D2700/123—Sensors measuring the inside temperature more than one sensor measuring the inside temperature in a compartment
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
Methods and apparatus for an energy efficient freezer or cooler defrost, which are particularly suited for an automated system, include procedures utilized for this purpose. The procedures are included in the firmware of an embedded controller and operate the cooler or freezer defrost cycle when required for increased energy efficiency.
Description
Technical field
The present invention relates generally to a kind of refrigerating plant and method, relate in particular to a kind of refrigerating plant and method of the highly effective defrosting for evaporator assemblies.
Background technology
Aspect current economic environment and legislation, need to reduce the energy consumption of heating, heating ventilation and air-conditioning HVAC and refrigeration plant.In order to reduce the total energy consumption of this equipment, applying electronic controller is to optimize the energy consumption of this equipment.Needing a function of optimizing is evaporator defrost.
Whether defrosting strategy of the prior art is to show to start defrost process with timer based on predetermined time, no matter and need.In unwanted situation, there is unnecessary energy consumption.In the process of defrosting, heat is introduced to cold air space, make energy saving very important, with (i), reduce the amount of the energy for defrosting, and (ii) reduce the required additional energy of heat of removing defrosting from cold air space.
Therefore, need only to start when needed refrigerating plant and the method for defrosting.
Summary of the invention
Refrigerating plant according to the present invention comprises fan, and it provides air-flow; Evaporator assemblies, it comprises the evaporator coil being arranged in air-flow; And cold-producing medium assembly, it is arranged to and evaporator coil fluid communication, so that cold-producing medium is fed to evaporator coil.First sensor, air-flow is at temperature and second sensor of the air-flow input side of evaporator coil described in its sensing, and air-flow is in the temperature of the air-flow outlet side of evaporator coil described in its sensing.The 3rd sensor, the temperature near the suction line outlet side of its sensing evaporator coil.Four-sensor, its sensing represents the temperature in the position of evaporator coil surface temperature.The 5th sensor (pressure converter), its sensing leaves the pressure of the cold-producing medium of evaporator coil.Controller, it is connected to first sensor, the second sensor, the 3rd sensor, four-sensor and the 5th sensor, to control evaporator assemblies and cold-producing medium assembly under refrigerating mode and defrosting mode.The startup of relatively controlling defrosting mode of this controller based on reference to dynamic efficiency and dynamic efficiency, this dynamic efficiency is the function of currency of the output saturation refrigerant temperature of input gas flow temperature, output gas flow temperature and the cold-producing medium that leaves evaporator coil.The temperature value of this controller based on by four-sensor institute sensing meets desired temperature in defrosting program or by the termination based on meeting time that in defrosting program, the time is set and control defrosting mode.When Temperature Setting or time, set while meeting, defrosting mode stops (first realizes).
For a method for the highly effective defrosting of evaporator assemblies, the method comprises: if (a) Tair, in is greater than temperature set-point, starts to start cooling assembly, fan electromotor and fan; (b) by Tair, within is cooled to put relevant predetermined temperature setting with thermostat set; (c) if Tair, in is in the preset range of described thermostat set point, starts defrosting program; (d) value of computing reference dynamic efficiency (RE) and dynamic efficiency (DE); (e) determine that RE deducts DE and whether equals predetermined threshold (DET) divided by RE, if so, so by deexcitation cooling assembly, deexcitation fan and activate at least one Defrost heater and start electric defrosting; (f) whether the temperature of definite (a) defrost termination sensor sensing is equal to or greater than default defrost termination temperature, (b) whether defrosting time is equal to or greater than the default defrost termination time, or (c) whether evaporator coil temperature is equal to or greater than the safe final temperature of heater; And if (g) any one of (a) in step (f)-(c) occurs, deexcitation Defrost heater, activates cooling assembly, and activates fan.
Accompanying drawing explanation
By reference to description below by reference to the accompanying drawings, will understand other and other object, advantage and feature of the present invention, wherein, identical Reference numeral represents identical structural detail, and:
Fig. 1 is the block diagram according to refrigerating plant of the present invention;
Fig. 2 is the block diagram of parts that the refrigerating plant of Fig. 1 is shown; And
Fig. 3 is the flow chart of the process of Fig. 2.
The specific embodiment
With reference to Fig. 1, refrigerating plant 20 disclosed in this invention comprises evaporator assemblies 22, cold-producing medium assembly 24 and controller 26.Evaporator assemblies 22 is arranged in the enclosure space 28 that needs refrigeration or air conditioning.Cold-producing medium assembly 24 and controller 26 are positioned at outside enclosure space 28, and are connected to each other, and are connected with evaporator assemblies 22.Enclosure space 28 can be the chamber being cooled for refrigeration or air conditioning.For example, in a preferred embodiment, enclosure space 28 is the passages in cool room.
Evaporator assemblies 22 comprises inner casing 29, and it has opening 31 and the opening 33 being positioned in opposing sidewalls.In inner casing 29, be provided with evaporator coil 30, one or more Defrost heater 32, one or more fan 34 and one or more fan electromotor 36.Cold-producing medium enters inner casing 29 via fluid pipeline 40, and discharges via compressor suction line 42.Pipeline 40 and pipeline 42 are connected to cold-producing medium assembly 24.Air flows through inner casing 29 by shown in arrow 44 and arrow 46 via opening 31 and opening 33.Defrost heater 32 comprises one or more heating element heater (not shown).
During refrigerating mode, controller 26 operation cold-producing medium assemblies 24 are so that cold-producing medium flows through fluid pipeline 40, refrigerant metering device 48 (typically being electric heating expansion valve or mechanical swelling valve), evaporator coil 30 and suction line 42.Controller 26 also operates fan electromotor 36 so that fan 34 rotates, thereby by fan 34, makes the air of enclosure space 28 pass through evaporator coil 30 via opening 31.Along with air is by evaporator coil 30, heat is removed and is transferred to colder cold-producing medium from air, and this cold-producing medium flows through evaporator coil 30.That is, air is cooled, and via opening 33, moves to enclosure space 28 by fan 34.Clean effect is to make the air in enclosure space 28 cooling.
Evaporator coil (heat exchanger) 30 is constructed such that cold-producing medium and air-flow are by evaporator coil, and does not need two media physically to contact.For example, evaporator coil 30 is constructed the pipeline that cold-producing medium therefrom flows through, and this pipeline is arranged to evaporator coil 30.Evaporator coil 30 is conducive to the heat transmission from air to cold-producing medium.
Enclosure space 28 need to be entered by user conventionally, thereby makes warm and humid/malaria be introduced in enclosure space 28.Infiltrate airborne or from the moisture that is stored in the product in enclosure space 28 by the cold surface being introduced in enclosure space.Due to any other surface of comparing in enclosure space 28, evaporator coil surface is the coldest surface in enclosure space 28, and be exposed to higher air velocity, and so work as fan 34, make air pass through evaporator coil 30 circulation times, airborne moisture is deposited on evaporator coil surface.
The performance that is deposited on the ice obstruction evaporator assemblies 22 in evaporator coil 30 shows two aspects.First, the ice on the fin (not shown) of evaporator coil 30 plays superinsulation barrier action between air stream and cold-producing medium; Thereby reduced the heat transmission from air to cold-producing medium.Secondly, the air-flow of ice restricted passage evaporator coil 30, thereby air-flow is reduced.In order to deposit and maintain the design performance efficiency of evaporator assemblies 22 except deicing, need defrosting.Defrosting mode can activate by one of three kinds of methods:
The automatically actuated demand defrosting of operational efficiency state of demand defrosting mode (elementary active defrosting mode)-based on evaporimeter.
If available pre-programmed parameters is met, automatically actuated safety defrosts in safe defrosting mode-(if programming on one's own initiative).
Manually defrosting mode-manually defrosting can manually boot via control unit interface.
During defrosting mode, controller 26 operation Defrost heaters 32 are with by ice-out.Defrost heater 32 is embedded into, connects or near the air heat transfer surface of evaporator coil 30 and evaporator coil 30.During defrosting, the surface of evaporator coil 30 is heated to above the cold point of ice.Consequently, ice-out becomes liquid, and this liquid leaks (not shown) from enclosure space 28 via evaporimeter to be removed.
Evaporator assemblies 22 also comprises that input air temperature sensor 50, delivery air temperature sensor 52, evaporimeter output refrigerant temperature sensors 82, defrost termination sensor 84, defrost termination sensor 92, heater stop safely (HSTS) switch 68 and cold-producing medium suction pressure converter (sensor) 86.Input air temperature sensor 50 is arranged near the input port place of evaporator assemblies 22 or its, or near the input port place of evaporator coil 30 or its.Delivery air temperature sensor 52 is arranged near the output port place of evaporator coil 30 or its, or near the output port place of evaporator assemblies 22 or its.The output signal of input air temperature sensor 50 and delivery air temperature sensor 52 is marked as respectively Tair, in (50,56) and Tair, and out (52,58), and proportional with the temperature of input air-flow and output gas flow respectively.Cold-producing medium suction pressure converter (sensor) 86 is configured to measure the pressure of the cold-producing medium that departs from evaporator coil 30.The output signal of cold-producing medium suction pressure converter (sensor) 86,88 is marked as Tref, out, and can be for determining the output saturation refrigerant temperature in evaporator coil 30.
Near the junction of the outlet side of suction line 42 and evaporator coil 30 or its, it is adjacent with suction line 42 that evaporimeter output temperature sensor 82 is placed in, and contact with it.Defrost termination sensor 84 is positioned in evaporator coil 30.HSTS sensor 68 is the safety switches that open or close according to the temperature of coil, and is positioned in evaporator coil 30.
With reference to Fig. 2, controller 26 comprises by bus 76 processor 70 connected to one another, memory 74 and I/O (I/O) interface 72.Memory 74 comprises the program of being carried out to operate refrigerating plant 20 by processor 70.What have substantial connection with the present invention is cooling program 78 and defrosting program 80.Although be shown independent program, the program that defrosts in some embodiments 80 can be incorporated in cooling program 78.
Processor 70 can be any suitable processor of carrying out or move the program in memory 74 that is stored in.For example, processor 70 can be microprocessor.
Memory 74 can be the required parameter of the Operation and maintenance of storage refrigerating plant 20 and any suitable memory of data.For example, memory 74 can comprise one or more random access memory, read-only storage, EPROM, insertion memory (as flash memory) or data key etc.
I/O (I/O) interface 72 is also connected to input air temperature sensor 50, delivery air temperature sensor 52, fan electromotor 36, Defrost heater 32, cold-producing medium assembly 24, refrigerant pressure converter 86, output refrigerant temperature sensors 82, defrost termination sensor 84 and HSTS switch 68 by connector 56,58,62,64,66,88,90,92 and 96 respectively.
Processor 70 is carried out cooling program 78 under refrigerating mode, so that cold-producing medium assembly 24 flows through fluid pipeline 40, refrigerant metering device 48 (as electric heating expansion valve or mechanical swelling valve), evaporator coil 30 and suction line 42 by cold-producing medium.Processor 70 also operates fan electromotor 36 so that fan 34 rotates, thereby by fan 34, makes the air of enclosure space 28 pass through evaporator coil 30 (as shown in arrow 44) via opening 31.Along with air is by evaporator coil 30, heat is removed and is transferred to colder cold-producing medium from air, and this cold-producing medium flows through evaporator coil 30.That is, air is cooled, and via opening 33, moves to enclosure space 28 (as shown in arrow 46) by fan 34.Clean effect is to make the air in enclosure space 28 cooling.
As described above, warm and humid/malaria is introduced in enclosure space 28, and ice is deposited on the cold surface in enclosure space 28.These ice depositions, by the most outstanding in the surface of evaporator coil 30, are compared any other surface in enclosure space 28, and evaporator coil surface is the coldest surface in enclosure space 28, and is exposed to higher air velocity.
When carrying out cooling program 78, processor 70 for need that defrosting mode starts based on Tair, in, Tair, out and Tref, the predetermined temperature of at least one in the temperature value of out (preferably in these temperature a plurality of) checks these temperature values continually.For example, check that operation is the initial step of defrosting program 80.If temperature conditions does not need defrosting, processor 70 continues to carry out cooling program 78.
If temperature conditions needs defrosting, processor 70 starts defrosting program 80.Then, if refrigerating plant 20 is configured in electric defrosting pattern, processor 70 cuts out fan electromotor 36, and Defrost heater 32 is opened, and cold-producing medium assembly 24 stops to evaporator coil 30 the supply system cryogens.If refrigerating plant 20 is configured in air defrosting mode, for predetermined period of time, processor 70 stops to evaporator coil 30 the supply system cryogens cold-producing medium assembly 24, and circulates in the surface that makes (one or more) fan 34 continue operation and make air pass through evaporator coil.
The dynamic efficiency (DE) of the performance of defrosting program in a preferred embodiment, 80 based on heat exchanger (evaporator coil 30) is determined temperature conditions.The actual heat that DE is defined as heat exchanger is transmitted the hot maximum that can transmit for identical inlet temperature and flow velocity divided by both cases.Compare air stream, the evaporimeter that cold-producing medium flows through has larger " thermal capacity ", and efficiency (E) can be expressed as ratio:
E＝(Tair，in-Tair，out)/(Tair，in-Tref，out)， (1)
Tair wherein, in is the temperature that enters the air of evaporator coil 30, Tair, out is the temperature of leaving the air of evaporator coil 30, and Tref, out is the saturated refrigerant temperature of leaving evaporator coil 30.
Processor 70 is carried out defrosting program 80 to monitor Tair, in, Tair, and out and Tref, out, thus determine dynamic efficiency DE.By searching corresponding to the saturation temperature of measured refrigerant pressure, determine Tref, out.Pressure converter 86 is measured the pressure of cold-producing medium.
The term of execution of defrosting program 80, processor 80 monitors Tair each time, in, Tair, and out and Tref, out, is calculated the value of E by processor 70.
In the following description of defrosting program 80 and Fig. 3, use following abbreviation:
DE dynamic efficiency
RE is with reference to efficiency
DET defrosting efficiency threshold value
DTT defrost termination temperature
DTS defrost termination sensor temperature
DT defrosting time
The DETT defrost termination time
The safe terminating switch of HSTS heater
The safe final temperature of HSTT heater
DET is by design and the definite temperature value of user's request.In one embodiment, DET is 35%.DTT is the predetermined defrost termination temperature obtaining by detection, for example, and typically at 40 °F-55 °F.DETT is if defrosting cycle stopped by the time, the time quantum that defrosting cycle moves.HSTT is the coil temperature that can not surpass, and for example, is in one embodiment 70 °F.
With reference to Fig. 3, at frame 100 places, by determining Tair, whether in is greater than temperature set-point, and processor 70 is carried out the instruction of cooling program 78 to control the startup of refrigerating plant 20.If be not more than temperature set-point, cold-producing medium assembly 24 does not start.If be greater than temperature set-point, processor 70 initializes the startup of cooling assembly 24, fan electromotor 36 and fan 34.Once start start, before starting defrosting program 80, when processor 70 is waited for until Tair, when in is cooled to the preset program temperature interior (being in one embodiment 15 °F) that relevant thermostat set point sets, at frame, 102 places have delay.Temperature set-point and thermostat set point are identical, and are determined by the end user who is placed in the product in enclosure space 28.
Once Tair, in is in 15 °F of thermostat set point, and processor 70 is carried out the instruction of defrosting program 80.At frame 104 places, processor 70 is carried out instruction to start to collect data, and starts calculating to set up RE and DE value.In one embodiment, RE and DE value are all set to equal 0 at first.At first, DE equals RE, and DE continues to equal RE until produce peak RE value.Peak RE value can change according to system operation, and along with system continues operation, DE is also by corresponding change.Once produce final peak RE value (DE will equal RE), the efficiency of evaporator coil starts to worsen so, and DE value will start decline and lower than RE value.
At frame 106 places, processor 70 uses formula (1) to carry out instructions, to calculate real-time RE and the DE in the operating process of refrigerating plant 20.This calculates the Tair being provided by input air temperature sensor 50, delivery air temperature sensor 52 and pressure converter (sensor) 86, in, Tair, out and Tref, the currency of out is provided.Processor 70 is processed collected real time data result of calculation, and then according to defrosting program, 80 instructions produce RE and DE value.At frame 108 places, processor 70 determines whether the current processing costs of DE equals RE.If so,, at frame 110 places, DE is configured to equal the currency of RE, and it is for the next comparison at frame 108 places.Then, processor 70 turns back to frame 104 places.
If not, at frame 112 places, processor 70 determines whether RE-DE equals predetermined threshold DET divided by RE.If not, the program 80 that defrosts turns back to frame 106 places.If so, control program 80 depends on that the requirement of system or application continue electric defrosting pattern or air defrosting mode, wherein, for electric defrosting pattern, cooling assembly is deactivated 116, and evaporator fan is deactivated 116A, and Defrost heater is activated 118; Or for air defrosting mode, cooling assembly is deactivated 136, and evaporator fan remains in operation 138.
If refrigerating plant 20 is arranged to electric defrosting pattern,, at frame 116 places, cold-producing medium assembly 24 is disabled.That is, cold-producing medium is not offered to evaporator coil 30.At frame 116A place, controller 26 deexcitations or close fan electromotor 36 and fan 34.At frame 118 places, controller 26 activates or connects Defrost heater 32.
At frame 120 places, the temperature that processor 70 uses by 84 sensings of DTS sensor, to determine whether it is equal to or greater than defrost termination temperature DTT.If not, at frame 122 places, processor 70 determines whether defrosting time DT is equal to or greater than defrost termination time D ETT.If not, at frame 124 places, processor 70 determines whether evaporator coil temperature is equal to or greater than the safe final temperature HSTT of heater.If not, cooling program 80 turns back to frame 120 places.If be defined as at frame 120,122 or 124 arbitrary places, be that, at frame 126 places, processor 70 makes controller 26 deexcitation Defrost heaters 32.At frame 128 places, processor postpones start-up time, to allow " the instillation time " of evaporator coil 30.At frame 130 places, when postponing to finish, activate cooling assembly 24.Then at frame 132 places, postpone start-up time.When time delay finishes, at frame 134 places, processor 70 makes controller 26 connect fan electromotor 36 and fan 34.Then at frame 104 places, processor 70 continues to carry out defrosting program 80.
If refrigerating plant 20 is arranged to air defrosting mode,, at frame 136 places, cold-producing medium assembly 24 is deactivated.At frame 138 places, processor 70 allows fan electromotor 36 and fan 34 to continue operation.At frame 140 places, processor 70 determines whether DT is equal to or greater than DTT.If not, processor 70 continues to carry out the instruction in frame 140, until DT is equal to or greater than DTT.When this occurs, at frame 142 places, processor 70 makes controller 26 activate cold-producing medium assembly 24 at frame 142 places, so that cold-producing medium stream is provided to evaporator assemblies 22.Then at frame 104 places, processor 70 continues to carry out defrosting program 80.
If refrigerating plant 20 is arranged to manual defrosting mode 114, at 114A place, the method determines manually whether defrosting is requested.If not, at 114B place, do not start defrosting so.If so, starting defrosting so at 115 places, is the air defrosting flow process in the step 136-142 of electric defrosting flow process in the step 116-142 of above-mentioned discussion or above-mentioned discussion subsequently.
The method also provides safe defrosting mode 113, and wherein, each parameter 113A that defrosts safely of system monitoring, to determine whether maximum safety defrosting parameter is exceeded 113B.If parameter is not exceeded, system turns back to 113A.If parameter is exceeded, system starts defrosting 115, is the electric defrosting flow process in the step 116-142 of above-mentioned discussion subsequently, or the defrosting of the air in the step 136-142 of above-mentioned discussion flow process.
Electronic controller of the present invention has several advantages.Along with energy cost increases, the extra cost of electronic controller becomes more rationally can be cost-saving.All operations parameter all concentrates in " the intelligent kitchen concept " in a microprocessor therein, and the electronic controller of the present invention in refrigeration plant is to communicate requisite with central microprocessor.Because electronic controller can be collected and storing temperature data, allow storekeeper to verify storing temperature and the condition of correct food production, so also have the advantage of legislation.Refrigerating plant of the present invention also has advantages of startup defrosting when the situation of evaporator coil requires defrosting.
With reference to preferred form of the present invention, so describe the present invention particularly, be apparent that, in the situation that do not depart from the spirit and scope of the present invention that claims limit, can make various changes and modification.
Claims (12)
1. a refrigerating plant, comprising:
Fan, it provides air-flow;
Evaporator assemblies, it comprises the evaporator coil being arranged in described air-flow;
Cold-producing medium assembly, it is arranged to and described evaporator coil fluid communication, cold-producing medium is fed to described evaporator coil;
First sensor, air-flow is in the temperature of the air-flow input side of described evaporator coil described in its sensing;
The second sensor, air-flow is in the temperature of the air-flow outlet side of described evaporator coil described in its sensing;
The 3rd sensor, the temperature near the suction line described in its sensing the outlet side of evaporator coil;
Four-sensor, its sensing represents the temperature in the position of evaporator coil temperature;
The 5th sensor, its sensing leaves the pressure of the described cold-producing medium of described evaporator coil, and wherein, the described pressure of described cold-producing medium sucks refrigerant temperature corresponding to output saturation; And
Controller, it is connected to described first sensor, described the second sensor, described the 3rd sensor, described four-sensor and described the 5th sensor, described controller is controlled described evaporator assemblies and described cold-producing medium assembly under refrigerating mode and defrosting mode, and the startup of relatively controlling described defrosting mode of described controller based on reference to dynamic efficiency and dynamic efficiency, described dynamic efficiency is that described air-flow is in the temperature of the described air-flow input side of described evaporator coil, described air-flow sucks the function of the currency of refrigerant temperature at the temperature of the described air-flow outlet side of described evaporator coil and the described output saturation that leaves the described cold-producing medium of described evaporator coil.
2. refrigerating plant according to claim 1, wherein, described evaporator assemblies is arranged in the enclosure space that needs refrigeration and/or air conditioning.
3. refrigerating plant according to claim 2, wherein, described cold-producing medium assembly and described controller are positioned at the outside of described enclosure space.
4. refrigerating plant according to claim 1, wherein, described dynamic efficiency is determined divided by the temperature value by described first sensor institute sensing with by the difference that the described output saturation of described the 5th sensor institute sensing sucks between refrigerant temperature value by the difference between described first sensor and the current temperature value of described the second sensor institute sensing.
5. refrigerating plant according to claim 1, wherein, described first sensor is input air temperature sensor.
6. refrigerating plant according to claim 1, wherein, described the second sensor is delivery air temperature sensor.
7. refrigerating plant according to claim 1, wherein, described the 3rd sensor is evaporimeter output refrigerant temperature sensors.
8. refrigerating plant according to claim 1, wherein, described four-sensor is defrost termination sensor.
9. refrigerating plant according to claim 1, wherein, described the 5th sensor is cold-producing medium suction pressure converter.
10. refrigerating plant according to claim 1, also comprises the safe terminating switch of heater.
11. refrigerating plants according to claim 1, wherein, the safe terminating switch of described heater is the temperature of the described evaporator coil based on by the safe terminating switch of described heater institute sensing and the safety switch that opens or closes, and is positioned in described evaporator coil.
12. 1 kinds of methods for the highly effective defrosting of evaporator assemblies, described method comprises:
If Tair a., in is greater than temperature set-point, starts to start cooling assembly, fan electromotor and fan;
B. by Tair, within is cooled to put relevant predetermined temperature setting with thermostat set;
If Tair c., in is in the preset range of described thermostat set point, starts defrosting program;
D. the value of computing reference dynamic efficiency (RE) and dynamic efficiency (DE);
E. determine that RE deducts DE and whether equals predetermined threshold (DET) divided by RE, if, so by fan described in cooling assembly, deexcitation described in deexcitation with activate at least one Defrost heater and start electric defrosting, or by cooling assembly described in deexcitation with keep the continuation of described evaporator fan to move to start air defrosting;
Whether the temperature of f. determining (a) defrost termination sensor sensing is equal to or greater than default defrost termination temperature, (b) whether defrosting time is equal to or greater than the default defrost termination time, or (c) whether evaporator coil temperature is equal to or greater than the safe final temperature of heater; And
If any one of g. (a) in step (f)-(c) occurs, Defrost heater described in deexcitation, activates described cooling assembly, and activates described fan.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161566555P | 2011-12-02 | 2011-12-02 | |
| US61/566,555 | 2011-12-02 | ||
| PCT/US2012/067254 WO2013082401A1 (en) | 2011-12-02 | 2012-11-30 | Refrigeration apparatus and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103998878A true CN103998878A (en) | 2014-08-20 |
Family
ID=48536092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280058789.5A Pending CN103998878A (en) | 2011-12-02 | 2012-11-30 | Refrigeration apparatus and method |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20130160471A1 (en) |
| EP (1) | EP2786081A1 (en) |
| CN (1) | CN103998878A (en) |
| WO (1) | WO2013082401A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109312953A (en) * | 2016-08-22 | 2019-02-05 | 株式会社电装 | Air-cooling apparatus and humidifying/dehumidifying apparatus |
| CN112219075A (en) * | 2018-06-22 | 2021-01-12 | 丹佛斯有限公司 | Method for terminating evaporator defrost by using air temperature measurement |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140352913A1 (en) * | 2013-05-31 | 2014-12-04 | Hamilton Sundstrand Corporation | Aircraft refrigeration unit evaporator heater |
| US10018400B2 (en) * | 2013-08-13 | 2018-07-10 | Lennox Industries Inc. | Defrost operation management in heat pumps |
| US10696139B2 (en) | 2016-03-07 | 2020-06-30 | Carrier Corporation | Return air intake grille de-icing method |
| KR102725964B1 (en) * | 2016-11-10 | 2024-11-05 | 엘지전자 주식회사 | Refrigerator and Controlling method for the same |
| KR102572457B1 (en) * | 2018-02-26 | 2023-08-30 | 엘지전자 주식회사 | Refrigerator and Controlling method for the same |
| ES2894502T3 (en) | 2018-06-22 | 2022-02-14 | Danfoss As | A procedure to finish defrosting an evaporator |
| EP3591316A1 (en) | 2018-07-06 | 2020-01-08 | Danfoss A/S | Apparatus for removing non-condensable gases from a refrigerant |
| KR102747196B1 (en) * | 2018-11-28 | 2024-12-27 | 삼성전자주식회사 | Refrigerator and control method thereof |
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- 2012-11-30 US US13/690,676 patent/US20130160471A1/en not_active Abandoned
- 2012-11-30 CN CN201280058789.5A patent/CN103998878A/en active Pending
- 2012-11-30 WO PCT/US2012/067254 patent/WO2013082401A1/en active Application Filing
- 2012-11-30 EP EP12853118.3A patent/EP2786081A1/en not_active Withdrawn
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| CN109312953A (en) * | 2016-08-22 | 2019-02-05 | 株式会社电装 | Air-cooling apparatus and humidifying/dehumidifying apparatus |
| CN112219075A (en) * | 2018-06-22 | 2021-01-12 | 丹佛斯有限公司 | Method for terminating evaporator defrost by using air temperature measurement |
| CN112219075B (en) * | 2018-06-22 | 2022-05-31 | 丹佛斯有限公司 | Method for terminating evaporator defrost by using air temperature measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| US20130160471A1 (en) | 2013-06-27 |
| WO2013082401A1 (en) | 2013-06-06 |
| EP2786081A1 (en) | 2014-10-08 |
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Application publication date: 20140820 |