EP0408152A1 - Elément refroidisseur humidifiant - Google Patents

Elément refroidisseur humidifiant Download PDF

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Publication number
EP0408152A1
EP0408152A1 EP90201886A EP90201886A EP0408152A1 EP 0408152 A1 EP0408152 A1 EP 0408152A1 EP 90201886 A EP90201886 A EP 90201886A EP 90201886 A EP90201886 A EP 90201886A EP 0408152 A1 EP0408152 A1 EP 0408152A1
Authority
EP
European Patent Office
Prior art keywords
cooling element
liquid
cooling
flow
parts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90201886A
Other languages
German (de)
English (en)
Inventor
Cornelis Johannes Simjouw
Robert Jans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fri Jado BV
Original Assignee
Fri Jado BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fri Jado BV filed Critical Fri Jado BV
Publication of EP0408152A1 publication Critical patent/EP0408152A1/fr
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the present invention relates to a cooling element generally known, certainly in the field of refrigerated displays.
  • Such cooling elements are subject to the drawback that with such a cooling element mounted in a refrigerated display the moisture present in the air passing through the cooling element condenses onto the cooling element through the cooling of the air and freezes solidly thereon. Firstly the air is hereby dehumidified so that relatively dry, cool air is fed to the refrigerated display so that the foodstuffs present in the display are greatly subject to dehydration. Secondly, deposition of ice occurs on the cooling element whereby the operation thereof is greatly reduced.
  • US-A-2 539 813 proposes a cooling apparatus, comprising a cooling element comprising at least one continuous pipe, provided with fins; means for supplying evaporatable liquid; means for draining the evaporated liquid; control means for controlling the flow of liquid such, that this flow is interrupted periodically in dependance of the temperature present in the cooling element; a ventilator for conveying the gas to be conveyed towards the chamber to be cooled conveying through the cooling element; and means for heating the cooling element during the periods of interruption.
  • This known apparatus makes use of a separate heating element for heating the cooling element during the interruption period. This implies, that in said known apparatus a separate heating element has to be provided, which increases the costs, both in relation to the production costs of such a cooling apparatus, as in view of the energy use thereof. Often such a heating element will be electrical.
  • GB-A-820980 shows an apparatus for electrical heating a cooling element, in which an electric current flows through said cooling element to heat it.
  • the aim of the present invention is to provide such a cooling apparatus, in which said drawbacks are avoided.
  • control means have been adapted for controling the flow of liquid such, that during the periods of interuption the cooling element is heated by heat being present in at least a part of the cooling element.
  • the cooling element is switched off when the lowest allowable temperature of the refrigerator display is reached. As soon as the highest allowable temperature is reached, the cooling element will be switched on again.
  • These switching actions are executed by a thermostat, so that a switching cycle develops, in which the cooling element is switched in and switched off alternately.
  • the frequency of the switching cycle is, in dependance of the qualities of the refrigerator display and the required temperature area several times per hour.
  • the invention makes use of this by heating the cooling element during the non-operational period thereof such that the ice deposited on the cooling element melts and evaporates so that it is carried back to the air. Accumulating ice deposition on the cooling element is hereby avoided while at the same time a decrease in the relative air humidity of the air passing through the cooling element is prevented. Dehydration of the foodstuffs present in the refrigerated display is prevented herewith.
  • the invention further makes use of the fact that the switching cycle is relatively frequent so that the quantity of ice for removal during each standstill period is small.
  • the amount of heat to be supplied for causing the ice to melt and evaporate is therefore also small, while the period of time herefor is also short. Thus is prevented that the temperature in the refrigerated display reaches too high values during this period of interruption.
  • a heat pump in which the evaporator comprises two separate parts, which are separated by a controllable valve.
  • evaporation only takes place in the second part of the evaporator.
  • no evaporation takes place; only the passing air is heated, before this enters the second part of the evaporator. Consequently the air serving as heat source flows initially through the first part of the evaporator and subsequently through the second part thereof.
  • the aim is to cool a gas flowing through an evaporator to make the temperature present in a chamber at a low level.
  • the direction of flow of the gas through the evaporator is opposite to that in the case of the heat pump; in the evaporator according to the present invention the gas to be cooled down initially flows through the second part of the evaporator and subsequently through the first part, so that the well known principle of counter flow is applied.
  • the useful effect of the partition of the evaporator takes place during the effective periods of the cycle, whereas in the apparatus according to the present invention the useful effect takes place during the interuption periods of the cycle.
  • the device comprises a liquid container 1 which is connected by means of a pipe 2 to a filter-dryer 3. This is connected in turn via a pipe 4 to a first magnetic valve 5.
  • a sight glass 6 is arranged in this pipe 4. Further, a pipe 7 leads from the first magnetic valve 5 to a cooling element 8.
  • the cooling element is divided into two blocks, a first block 9 and a second block 10.
  • the fins 12 of the first block 9 and the second block 10 are common; they extend over the first block 9 and the second block 10.
  • the tube 13 extending through the first block 9 of the cooling element 8 is connected by means of a pipe 14 to the tube of the second block of the cooling element.
  • An expansion valve 16 is accommodated in the line 14.
  • the expansion valve 16 aims to insure that at the end of the pipe 15 just all liquid has been evaporated.
  • the tube 15 is connected by means of a pipe 18 to a compressor 19.
  • a control member or valve 17 Arranged in pipe 18 is a control member or valve 17 having as function to keep constant the pressure of the gas-liquid mixture flowing through the tube 15 of the second part 10 of the cooling block 8.
  • a second magnetic valve 5 Arranged in the pipe 18 is a second magnetic valve 5 as well as a valve 21 for isolating the compressor 19.
  • the compressor 19 is further connected by means of a pipe 22 to a condenser 23.
  • the condenser 23 is again connected via the pipe 24 to the container 1.
  • the liquid present in the container 1 is in the state indicated in fig. 2 by the point A.
  • This liquid is then fed through the pipe 2, the dryer/filter 3, the sight glass 6 and the pipe 4 to the magnetic valve 5.
  • the liquid subsequently runs through the pipe 7 and the tube 13 of the first block 9 of the evaporator 8. Lowering of the temperature of the liquid takes place herein.
  • the point A′ is then reached, which indicates the supercooling of the liquid.
  • the liquid subsequently runs through the pipe 14 and the expansion valve 16 arranged therein where a throttling process takes place.
  • the state is then reached which is indicated in fig. 2 with the letter B. It is noted here that as a result of the throttling process a mixture of cooling liquid and cooling gas occurs with the same temperatures, the value whereof is represented by the point B.
  • the thus obtained liquid runs through the tube 15 of the second block 10 of the cooling element 8 and applies its cooling effect there.
  • the dimensioning of the second block 10 is such that the gas contains no more liquid after passing through the cooling block 10. In this way the state C in fig. 2 is reached when the gas leaves the pipe 15.
  • the gas then runs through the pipe 18 wherein the control member 17, a magnetic valve 5 and a valve 21 are arranged and subsequently arrives in the compressor 19 wherein compression takes place to the point indicated in fig. 2 with the letter D.
  • the gas is compressed herein. It then passes through the pipe 22, the valve 21 and is guided to the condenser 23, wherein the gas condenses and again returns to the original state A and is carried back again to the container 1 as liquid.
  • the expansion valve 16 is accommodated in the pipe 14 and in this way controls the amount of liquid fed to the second evaporator block 10.
  • the valve further senses the temperature of the gas leaving the second evaporator block 10 through the pipe 18.
  • the valve 16 herein controls the amount of liquid fed to the second evaporator block such, that the overheating of the gas leaving evaporator block 10 amounts to approximately 10K. In this way a latent amount of cold is always present in the second evaporator block.
  • the process described above takes place during the closed state of the thermostat which measures the temperature of the space for cooling. As soon as this temperature reaches a determined minimum value the cooling process is terminated and the cooling element 8 is isolated using the magnetic valves 5. As a result of the heat present in the cooling element 8, in particular in the first block 9 thereof, the temperature of the cooling element will then increase so that ice deposition present melts and evaporates. The relative air humidity of the space for cooling will increase herewith so that danger of dehydration is avoided. After the temperature of the space for cooling has increased again, the cooling process is set into operation again and the valves 5 are opened again as soon as the switching point of the thermostat is reached.

Landscapes

  • 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)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
EP90201886A 1989-07-11 1990-07-10 Elément refroidisseur humidifiant Withdrawn EP0408152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8901785 1989-07-11
NL8901785A NL8901785A (nl) 1989-07-11 1989-07-11 Bevochtigingskoelelement.

Publications (1)

Publication Number Publication Date
EP0408152A1 true EP0408152A1 (fr) 1991-01-16

Family

ID=19855022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90201886A Withdrawn EP0408152A1 (fr) 1989-07-11 1990-07-10 Elément refroidisseur humidifiant

Country Status (2)

Country Link
EP (1) EP0408152A1 (fr)
NL (1) NL8901785A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2716635A1 (fr) * 1994-02-25 1995-09-01 Binder Peter Michael Armoire-étuve de laboratoire notamment armoire-étuve réfrigérée à équilibrage de température.

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492970A (en) * 1943-10-06 1950-01-03 Herman H Curry Defrosting system
US2539813A (en) * 1946-09-27 1951-01-30 Lawrence E Carson Refrigerating apparatus and method
US3139735A (en) * 1962-04-16 1964-07-07 Kramer Trenton Co Vapor compression air conditioning system or apparatus and method of operating the same
GB1015727A (en) * 1963-11-28 1966-01-05 Westool Ltd Dehumidifiers
US3283524A (en) * 1964-03-17 1966-11-08 Byron John Thomson Refrigeration system
FR2058266A7 (fr) * 1969-08-14 1971-05-28 Escher Wyss Ag
FR2345679A1 (fr) * 1976-03-26 1977-10-21 Cassou Jean Procede augmentant la puissance thermodynamique d'un compresseur a fluide frigorigene par sous-refroidissement accru de liquide
FR2360053A1 (fr) * 1976-07-28 1978-02-24 Leveugle Jules Systeme d'echange thermique a fluide frigorigene
FR2474668A1 (fr) * 1980-01-29 1981-07-31 Bonnet Ets Armoire frigorifique a degre hygrometrique reglable
DE3027512A1 (de) * 1980-07-19 1982-02-18 August Brötje GmbH & Co, 2902 Rastede Rohrleitungsschaltung fuer eine waermepumpe
DE3036687A1 (de) * 1980-09-29 1982-05-13 Siemens AG, 1000 Berlin und 8000 München Verfahren und vorrichtung zum abtauen von luft-wasser-waermepumpen
DE3128352A1 (de) * 1981-07-17 1983-01-27 Zamos GmbH, 8152 Feldkirchen Waermepumpe

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492970A (en) * 1943-10-06 1950-01-03 Herman H Curry Defrosting system
US2539813A (en) * 1946-09-27 1951-01-30 Lawrence E Carson Refrigerating apparatus and method
US3139735A (en) * 1962-04-16 1964-07-07 Kramer Trenton Co Vapor compression air conditioning system or apparatus and method of operating the same
GB1015727A (en) * 1963-11-28 1966-01-05 Westool Ltd Dehumidifiers
US3283524A (en) * 1964-03-17 1966-11-08 Byron John Thomson Refrigeration system
FR2058266A7 (fr) * 1969-08-14 1971-05-28 Escher Wyss Ag
FR2345679A1 (fr) * 1976-03-26 1977-10-21 Cassou Jean Procede augmentant la puissance thermodynamique d'un compresseur a fluide frigorigene par sous-refroidissement accru de liquide
FR2360053A1 (fr) * 1976-07-28 1978-02-24 Leveugle Jules Systeme d'echange thermique a fluide frigorigene
FR2474668A1 (fr) * 1980-01-29 1981-07-31 Bonnet Ets Armoire frigorifique a degre hygrometrique reglable
DE3027512A1 (de) * 1980-07-19 1982-02-18 August Brötje GmbH & Co, 2902 Rastede Rohrleitungsschaltung fuer eine waermepumpe
DE3036687A1 (de) * 1980-09-29 1982-05-13 Siemens AG, 1000 Berlin und 8000 München Verfahren und vorrichtung zum abtauen von luft-wasser-waermepumpen
DE3128352A1 (de) * 1981-07-17 1983-01-27 Zamos GmbH, 8152 Feldkirchen Waermepumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2716635A1 (fr) * 1994-02-25 1995-09-01 Binder Peter Michael Armoire-étuve de laboratoire notamment armoire-étuve réfrigérée à équilibrage de température.

Also Published As

Publication number Publication date
NL8901785A (nl) 1991-02-01

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