DK169393B1 - Control device for a refrigeration system - Google Patents
Control device for a refrigeration system Download PDFInfo
- Publication number
- DK169393B1 DK169393B1 DK003492A DK3492A DK169393B1 DK 169393 B1 DK169393 B1 DK 169393B1 DK 003492 A DK003492 A DK 003492A DK 3492 A DK3492 A DK 3492A DK 169393 B1 DK169393 B1 DK 169393B1
- Authority
- DK
- Denmark
- Prior art keywords
- evaporator
- temperature
- control device
- cooling
- superheat
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/21—Refrigerant outlet evaporator temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
1 i DK 169393 B11 in DK 169393 B1
En regulerings indretning for et køleanlæg, som har en kompressor, en kondensator og mindst to fordampere, med styrbare indsprøjtningsventiler på fordampernes indgangsside og med en regulator for fordampernes overhedningstempera-5 tur er kendt fra DE 33 29 661 Al.A regulating device for a cooling system having a compressor, a capacitor and at least two evaporators, with controllable injection valves on the inlet side of the evaporator and with a regulator for the superheat temperature of the evaporators is known from DE 33 29 661 A1.
Ved denne kendte reguleringsindretning er hver fordamper tilsluttet en egen reguleringskreds til regulering af en overhedningstemperatur, hvorved differensen mellem fordam-10 perens ind- og udgangstemperatur måles ved mindst en fordamper som mål for overhedningstemperaturen. Ved lille kølebelastning, fx kun 10% af den nominelle effekt eller mindre, er temperaturdifferenserne ved fordamperne dog meget små, især når den samlede køleeffekt kan indstilles 15 af kompressorens sugetryk- eller effektregulering. Sådanne små temperaturdifferenser stiller store krav til nøjagtigheden af indsprøjtningsreguleringen, især når der arbejdes med store kølemiddelfyldninger i køleanlægget. Således er der ved ringe belastning fare for, at en fordamper overta-20 ger den samlede køleeffekt, og den eller de andre fordampere er ude af drift. Følgen deraf er en uensartet temperaturfordeling i et rum, som afkøles af fordamperne.In this known control device, each evaporator is connected to its own control circuit for controlling a superheat temperature, whereby the difference between the inlet and outlet temperature of the evaporator is measured by at least one evaporator as a measure of the superheat temperature. However, at low cooling load, for example only 10% of the rated power or less, the temperature differences at the evaporators are very small, especially when the total cooling power can be set by the compressor suction pressure or power control. Such small temperature differences place great demands on the accuracy of the injection control, especially when working with large refrigerant fillings in the refrigerator. Thus, at low load, there is a danger that an evaporator will take over the overall cooling power and the other evaporator (s) are out of service. The result is a disparate temperature distribution in a room that is cooled by the evaporators.
Formålet med opfindelsen er at angive en reguleringsind-25 retning af den i indledningen nævnte art, som ved lille kølebelastning sikrer en i stor udstrækning ensartet belastning af fordamperne.The object of the invention is to provide a regulating device of the kind mentioned in the preamble, which at low cooling load ensures a largely uniform load on the evaporators.
Til løsning af denne opgave er ved reguleringsindretningen 30 for et køleanlæg ifølge opfindelsen, som har en kompressor, en kondensator og mindst to fordampere og er forsynet med styrbare indsprøjtningsventiler på fordampernes indgangsside og med en regulator for fordampernes overhedningstemperatur, hver fordamper anbragt i sin egen luft-35 strøm, der tilføres et rum, der skal afkøles, og i hver luftstrøm i strømningsretningen efter hver fordamper er DK 169393 B1 2 der anbragt en lufttemperaturføler, hvis målesignal kan tilføres regulatoren, hvorved fordampernes overhednings-temperatur-referenceværdier ved hjælp af regulatoren kan indstilles automatisk i afhængighed af lufttemperaturfø-5 lernes målesignaler således, at køletemperaturen for alle fordampere i stor udstrækning forbliver indbyrdes ens.To solve this problem, the control device 30 for a refrigeration system according to the invention having a compressor, a capacitor and at least two evaporators and is provided with controllable injection valves on the inlet side of the evaporator and with a regulator for the superheater temperature, each evaporator is arranged in its own air. -35 current supplied to a room to be cooled, and in each flow of air in the direction of flow after each evaporator is provided an air temperature sensor whose measuring signal can be supplied to the controller, whereby the superheat temperature reference values can be supplied by means of the controller. is automatically set depending on the measurement temperature of the air temperature sensors so that the cooling temperature of all evaporators remains largely the same.
Forudsat en ensartet fordeling af fordamperne i det rum, der skal afkøles, indstilles på denne måde en i stor udlo strækning ensartet temperaturfordeling i temperaturreguleringens ligevægtsstilling.Assuming a uniform distribution of the evaporators in the room to be cooled, in this way a uniform distribution of temperature is set in the equilibrium position of the temperature control.
I detaljer kan dette opnås ved, at overhedningstemperatur-referenceværdien for en fordamper kan nedsættes, når den 15 af den tilsvarende lufttemperaturføler målte lufttemperatur er højere end ved en af de andre fordampere. Herved tvinges den pågældende fordampers indsprøjtningsventil til at åbne, således at alle fordampere holdes i drift.In detail, this can be achieved by reducing the superheat temperature reference value for an evaporator when the measured air temperature measured by the corresponding air temperature sensor is higher than that of one of the other evaporators. This forces the evaporator's injection valve to open so that all evaporators are kept in operation.
20 Således kan der være sørget for, at overhedningstempera- tur-referenceværdien for den elller de koldeste fordampere kan forhøjes og for den eller de varmeste fordampere kan nedsættes. Herved fås en tilpasning af kølemiddeltemperaturen til fordampningstemperaturen, således at kølemiddel-25 temperaturen nærmer sig den samme værdi, og der opnås en mere ensartet temperaturfordeling.Thus, it may be ensured that the superheat temperature reference value for the or the coldest evaporator can be increased and for the hottest evaporator or heat can be reduced. Hereby, the refrigerant temperature is adjusted to the evaporating temperature so that the refrigerant temperature approaches the same value and a more uniform temperature distribution is obtained.
Det er endvidere gunstigt, at en rumtemperaturføler er anbragt i det rum, der skal afkøles, i afhængighed af hvis 30 målesignal køleanlæggets køleeffekt kan tilpasses behovet ved hjælp af regulatoren. Dette muliggør en bedre regulering af fordampernes overhedningstemperatur, da belastningssvingninger nu ikke alene skal udlignes af indsprøjtningsreguleringen .Furthermore, it is advantageous for a room temperature sensor to be placed in the room to be cooled, depending on whose cooling signal the cooling power of the cooling system can be adjusted to the need by means of the controller. This allows for better regulation of the superheat temperature of the evaporators, as load fluctuations must now not only be offset by the injection regulation.
35 I Γ ^—........35 I —
3 DK 169393 B13 DK 169393 B1
Forskellen mellem rumtemperaturen og den til kølerummet ønskede temperatur udgør et mål for kølebehovet. Når kompressoren pumper mindre kølemiddel, stiger fordampningstrykket, og køleeffekten falder.The difference between the room temperature and the temperature desired for the cold room is a measure of the cooling demand. As the compressor pumps less refrigerant, the evaporation pressure rises and the cooling power decreases.
55
Fortrinsvis begynder indstillingen af overhedningstempera-tur-referenceværdierne derfor tidligst, når en nedsættelse af køleeffekten i køleanlægget begynder. Da det tilfælde, at en eller flere fordampere er ude af drift, kun optræder 10 ved delbelastning, kan køleeffektreguleringen herved anvendes som indikator for optræden af delbelastning til udløsning af tilpasningen af overhedningstemperatur-refe-renceværdierne ifølge opfindelsen, således at denne først begynder, når en nedsættelse af køleeffekten i køleanlæg-15 get begynder. Ved denne overstyring af den normale overhedningsregulering undgås en begrænsning af køleanlæggets køleeffekt under en afkølingsfase efter opstart, ved hvilken der arbejdes med maksimal køleeffekt.Preferably, therefore, the setting of the superheat temperature reference values begins at the earliest when a reduction of the cooling effect in the cooling system begins. Since one or more evaporators are inoperative, only 10 occurs at partial load, the cooling power control can hereby be used as an indicator of partial load occurrence to trigger the adjustment of the superheat temperature reference values according to the invention, so that it only begins when a decrease in the cooling effect in the cooling system begins. This override of the normal superheat regulation avoids limiting the cooling power of the cooling system during a cooling phase after start-up, at which maximum cooling power is worked.
20 I detaljer kan kompressorens effekt indstilles i afhængighed af rumtemperaturen til tilpasning af køleanlæggets køleeffekt til behovet.20 In detail, the power of the compressor can be set depending on the room temperature to adjust the cooling power of the cooling system to the need.
Alternativt kan køleeffekten indstilles ved hjælp af en 25 regulering af fordampertrykket, fx ved at der er anbragt en trykafhængig styret ventil i kompressorens sugeledning.Alternatively, the cooling effect can be adjusted by means of a control of the evaporator pressure, for example by the presence of a pressure-dependent controlled valve in the suction line of the compressor.
Endvidere kan en i kompressorens sugeledning anbragt, i afhængighed af rumtemperaturen styret ventil reguleres til 30 tilpasning af køleanlæggets køleeffekt til fordampertryk-kets belastning.Furthermore, a valve controlled in the compressor suction line, depending on the room temperature, can be adjusted to adapt the cooling power of the cooling system to the evaporator pressure load.
På enkel måde kan herved fordampernes virksomme flader, under overstyring den normale ved hjælp af regulatoren 35 bevirkede overhedningsregulering, indstilles ved styring af indsprøjtningsventilerne.In this way, the effective surfaces of the evaporators, while overriding the normal superheat control effected by the regulator 35, can be adjusted by controlling the injection valves.
DK 169393 B1 4 Således kan reguleringen af køleeffekten ske ved åbne/lukke-styring af de to indsprøjtningsventiler, hvorved tastforholdet svarer til effekten, og overhedningen reguleres ved modulation af åbnings varigheden.DK 169393 B1 4 Thus, the cooling effect can be controlled by open / close control of the two injection valves, whereby the key ratio corresponds to the effect and the superheat is regulated by modulation of the opening duration.
55
Opfindelsen og dens videre udformninger beskrives nærmere nedenstående ved hjælp af tegningen af foretrukne udførelseseksempler, der viser i 10 fig. 1 en skematisk fremstilling af et køleanlæg med en reguleringsindretning ifølge opfindelsen, fig. 2 en skematisk fremstilling af et køleanlæg med en varieret reguleringsindretning ifølge opfindel-15 sen og fig. 3 køleeffekt/overhedningstemperatur-grænsekurven for det mindste, stabile overhedningstemperatur-målesignal, hvorved et til venstre for grænsen 20 liggende signal er ustabilt (svingende), og et til højre derfor liggende signal er stabilt.The invention and its further embodiments are described in more detail below with reference to the drawing of preferred embodiments illustrated in FIG. 1 is a schematic representation of a refrigeration system with a control device according to the invention; FIG. 2 is a schematic representation of a refrigeration system with a varied control device according to the invention; and FIG. 3 is the cooling power / superheat temperature limit curve for the smallest stable superheat temperature measurement signal whereby a signal to the left of the boundary 20 is unstable (oscillating) and a signal to the right therefore stable.
Køleanlægget i fig. 1 indeholder et kølekredsløb med en kompressor 1, en denne efterkoblet, ved hjælp af en blæser 25 afkølet kondensator 2, en kondensatoren 2 efterkoblet beholder 3 og to med beholderen 3 forbundne parallelle grene, som begge i serie indeholder en elektronisk styret indsprøjtningsventil 4 (også kaldt ekspansionsventil) og en fordamper 5. På udgangssiden er fordamperne 5 forbundet 30 med kompressorens 1 sugeledning 6.The cooling system of FIG. 1 contains a cooling circuit with a compressor 1, one which is retrofitted, by means of a fan 25 cooled capacitor 2, one capacitor 2 retrofitted container 3 and two parallel branches connected to the container 3, both of which in series contain an electronically controlled injection valve 4 (also called an expansion valve) and an evaporator 5. On the output side, the evaporators 5 are connected to the suction line 6 of the compressor 1.
Endvidere indeholder køleanlægget en reguleringsindretning med en regulator 7, på fordampernes 5 indgangsside anbragte elektroniske temperaturfølere 8, på fordampernes 5 ud-35 gangsside anbragte elektroniske temperaturfølere 9, i hver sin luftstrøm af en af to med hver sin af fordamperne 5 I T ^------ 5 DK 169393 B1 samvirkende blæsere 10 i strømningsretning efter fordamperne 5 anbragte elektroniske lufttemperaturfølere 11, en rumtemperaturføler 12 og indstillingsorganer 13 for indsprøjtningsventilerne 4. Ved regulatoren 7 drejer det sig 5 om en mikroprocessor med tilsvarende henholdsvis analog/ digital- og digital/analog-omsættere for henholdsvis måle-og indstillingssignalerne og et programmerbart referenceværdi-lager.Further, the cooling system includes a control device with a regulator 7, electronic temperature sensors 8 located on the input side of the evaporators 5, electronic temperature sensors 9 located on the output side of the evaporators 5, in each air flow of one of two with each of the evaporators 5 IT --- 5 DK 169393 B1 co-operating fans 10 in flow direction after the evaporators 5 placed electronic air temperature sensors 11, a room temperature sensor 12 and setting means 13 for the injection valves 4. At the controller 7, this is a microprocessor with corresponding analog / digital and digital / analog converters for the measuring and setting signals and a programmable reference value store respectively.
10 Fordamperne 5 er anbragt ensartet fordelt i et rum 14, der skal afkøles.The evaporators 5 are uniformly distributed in a space 14 to be cooled.
Temperaturfølerne 8 og 9 måler fordampernes 5 ind- og udgangstemperatur og tilfører regulatoren 7 målesignalerne.The temperature sensors 8 and 9 measure the inlet and output temperature of the evaporators 5 and supply the measuring signals to the controller 7.
15 Regulatoren 7 danner differensen af målesignalerne af fordampernes 5 ind- og udgangstemperaturer til konstatering af de pågældende aktuelle værdier af hver fordampers 5 overhedningstemperatur. Således sammenligner regulatoren 7 (ved hjælp af en intern sammenligner) henholdsvis den ak-20 tuelle differens og overhedningstemperaturen med en over-hedningstemperatur-referenceværdi og efterregulerer indsprøjtningsventilerne 4 over indstillingsorganerne 13 i afhængighed af en til den konstaterede differens svarende reguleringsafvigelse i retning af en reduktion af regule-25 ringsafvigelsen. Desuden ændrer regulatoren 7 overhed- ningstemperatur-referenceværdien automatisk i afhængighed af størrelsen og ændringshastigheden af den aktuelle værdi af fordampernes 5 overhedningstemperatur således, at såvel svingninger som oversvingninger af overhedningstemperatu-30 ren under referenceværdien i stor udstrækning undgås. På denne måde sørger regulatoren 7 automatisk for en optimal reguleringsgodhed, især for at stedlige svingninger af endepunktet af kølemidlets fordampning i fordamperne 5 (dvs. stedlige svingninger af positionen for grænsen mel-35 lem flydende og gasformigt kølemiddel) i stor udstrækning undgås og forbliver inden i fordamperne 5.The controller 7 generates the difference of the measurement signals of the inlet and outlet temperatures of the evaporators 5 to determine the relevant current values of the superheat temperature of each evaporator 5. Thus, the controller 7 (by means of an internal comparator) compares the actual difference and superheat temperature, respectively, with a superheat temperature reference value and down-regulates the injection valves 4 over the adjusting means 13 in response to a regulation deviation corresponding to the difference found. of the regulatory deviation. In addition, the controller 7 automatically changes the superheat temperature reference value depending on the magnitude and rate of change of the actual value of the superheat temperature of the evaporator 5, so that both oscillations and fluctuations of the superheat temperature below the reference value are largely avoided. In this way, the controller 7 automatically provides an optimum control goodness, in particular that local oscillations of the end point of the refrigerant evaporation in the evaporators 5 (i.e., local oscillations of the liquid-gaseous coolant boundary position) are largely avoided and remain within in the evaporators 5.
6 DK 169393 B16 DK 169393 B1
Lufttemperaturfølernes 11 målesignaler tilføres ligeledes regulatoren 7 og sammenlignes deri. Når den af den ene lufttemperaturføler 11 målte temperatur og dermed temperaturen af den ene fordamper 5 er højere end henholdsvis den 5 af den anden lufttemperaturføler 11 målte temperatur og den anden fordampers 5 temperatur, og overhedningstemperaturen af den ene fordamper 5 ikke har overskredet den mindste stabilitet, nedsættes overhedningstemperatur-refe-renceværdien for den ene fordamper automatisk i regulato-10 ren 7, mens overhedningstemperatur-referenceværdien for den anden fordamper 5 automatisk forhøjes. På denne måde fordeles fordampernes 5 kølebelastning ensartet på fordamperne 5 og forhindrer, at en af fordamperne 5 i sådanne belastningsområder, i hvilke kølebelastningen gennem rum-15 met 14 alene kan overtages af en fordamper 5, sættes ud af drift, og der indstilles en uensartet temperaturfordeling i rummet 14.The measurement signals of the air temperature sensors 11 are also supplied to the controller 7 and compared therein. When the temperature measured by one air temperature sensor 11 and thus the temperature of one evaporator 5 is higher than the temperature measured by the other air temperature sensor 11 and the temperature of the other evaporator 5, respectively, and the superheating temperature of one evaporator 5 has not exceeded the minimum stability. , the superheat temperature reference value for one evaporator is automatically reduced in controller 7, while the superheat temperature reference value for the other evaporator 5 is automatically increased. In this way, the cooling load of the evaporators 5 is distributed uniformly to the evaporators 5 and prevents one of the evaporators 5 in such load ranges in which the cooling load through the space 14 can only be taken over by an evaporator 5, being set off and an uneven setting is set. temperature distribution in room 14.
Rumtemperaturfølerens 12 målesignal tilføres ligeledes 20 regulatoren 7, som i afhængighed af dette tilpasser køleanlæggets køleeffekt til det øjeblikkelige behov, idet den over en styreledning 15 indstiller kompressorens 1 effekt tilsvarende, fx ved en af flere trin (parallelt arbejdende kompressorer) bestående kompressor 1 udvælger det passende 25 antal trin, eller indstiller kompressorens 1 omdrejnings tal tilsvarende.The measurement signal of the room temperature sensor 12 is also supplied to the controller 7, which accordingly adjusts the cooling power of the cooling system to the immediate need, by adjusting the power of the compressor 1 correspondingly over a control line 15, for example by a compressor 1 consisting of several steps (parallel operating compressors). appropriate 25 number of steps, or adjust the speed of the compressor 1 accordingly.
Fig. 2 viser en variation af køleanlægget i fig. 1. Ved denne variation er der i stedet for temperaturfølerne 8 på 30 indgangssiden i fig. 1 ved den for fordamperne 5 fælles sugeledning 16, anbragt en trykføler 17, hvis målesignal ligeledes tilføres regulatoren 7. Derudover bevirkes over-hedningstemperatur-reguleringen i afhængighed af temperaturfølernes 9 målesignaler og af trykfølerens 17 målesig-35 nal.FIG. 2 shows a variation of the cooling system of FIG. 1. With this variation, instead of the temperature sensors 8 on the input side of FIG. 1, located on the suction line 16 common to the evaporator 5, a pressure sensor 17, whose measurement signal is also supplied to the controller 7. In addition, the superheat temperature control is effected depending on the measurement signals of the temperature sensors 9 and the measurement signal of the pressure sensor 17.
· t ^^— —1 — — DK 169393 B1 7 I afhængighed af rumtemperaturføleren 12 bevirker regulatoren 7 en fordampertrykregulering over et indstillingsorgan 18 og en af dette styret indstillingsventil 19 i kompressorens 1 sugetrykledning 6 i retning af en tilpasning 5 af køleanlæggets køleeffekt til belastningen, hvorved det ved indstillingsventilen 19 drejer sig om en tastforhold-styret on/off-ventil.- Depending on the room temperature sensor 12, the controller 7 provides an evaporator pressure control over a setting member 18 and a control valve 19 thereof controlled in the suction pressure line 6 of the compressor 1 in the direction of an adaptation 5 of the cooling power of the cooling system to the load. , whereby at the setting valve 19, it is a key ratio controlled on / off valve.
Andre variationer er ligeledes mulige, således kan der 10 være anbragt mere end to fordampere 5, ved hvilke overhedningstemperaturen og køleeffekten ligesom ved udførelseseksemplet i fig. 1 eller 2 henholdsvis reguleres og tilpasses hinanden. Endvidere kan der i stedet for to blæsere 10 kun være anbragt en blæser, hvis luftstrøm under for-15 grening fordeles til fordamperne 5. Således kan de kun over fordamperne 5 ledte luftstrømme ledes ind i rummet 14 i stedet for anbringelsen af fordamperne 5 i det tilhørende rum 14.Other variations are also possible, so that more than two evaporators 5 may be arranged at which the superheat temperature and cooling effect as in the embodiment of FIG. 1 or 2 respectively are regulated and adapted to each other. Furthermore, instead of two blowers 10, only one blower may be provided whose air flow during branching is distributed to the evaporators 5. Thus, only air streams conducted over the evaporators 5 can be led into the space 14 instead of the evaporators 5 being placed in it. associated rooms 14.
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4100749 | 1991-01-12 | ||
| DE4100749A DE4100749A1 (en) | 1991-01-12 | 1991-01-12 | Regulator device for refrigerator - cools each evaporator in air current to chamber and has air temp. probe in each evaporator air flow |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK3492D0 DK3492D0 (en) | 1992-01-10 |
| DK3492A DK3492A (en) | 1992-07-13 |
| DK169393B1 true DK169393B1 (en) | 1994-10-17 |
Family
ID=6422900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK003492A DK169393B1 (en) | 1991-01-12 | 1992-01-10 | Control device for a refrigeration system |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE4100749A1 (en) |
| DK (1) | DK169393B1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10021610A1 (en) * | 2000-05-04 | 2001-11-08 | Linde Ag | Method for operating a (composite) refrigeration system |
| US6786056B2 (en) * | 2002-08-02 | 2004-09-07 | Hewlett-Packard Development Company, L.P. | Cooling system with evaporators distributed in parallel |
| ES2594155T3 (en) * | 2007-01-04 | 2016-12-16 | Carrier Corporation | Cooling circuit overheating control |
| US9303901B2 (en) | 2007-06-12 | 2016-04-05 | Danfoss A/S | Method for controlling a vapour compression system |
| DE102010018543A1 (en) * | 2010-03-01 | 2011-09-01 | Liebherr-Hausgeräte Ochsenhausen GmbH | Fridge and / or freezer |
| EP2894421A1 (en) * | 2014-01-14 | 2015-07-15 | Danfoss A/S | A method for controlling a supply of refrigerant to an evaporator based on temperature measurements |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3329661A1 (en) * | 1982-12-14 | 1984-06-14 | VEB Kombinat Luft- und Kältetechnik, DDR 8080 Dresden | Regulation of temperatures, temperature differences or levels in refrigerant circuits |
| JPH0124677Y2 (en) * | 1986-04-19 | 1989-07-26 | ||
| DE3713869A1 (en) * | 1987-04-25 | 1988-11-03 | Danfoss As | CONTROL UNIT FOR THE OVERHEATING TEMPERATURE OF THE EVAPORATOR OF A REFRIGERATION OR HEAT PUMP SYSTEM |
-
1991
- 1991-01-12 DE DE4100749A patent/DE4100749A1/en active Granted
-
1992
- 1992-01-10 DK DK003492A patent/DK169393B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE4100749C2 (en) | 1993-03-18 |
| DE4100749A1 (en) | 1992-07-16 |
| DK3492D0 (en) | 1992-01-10 |
| DK3492A (en) | 1992-07-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| B1 | Patent granted (law 1993) | ||
| PBP | Patent lapsed |
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