WO2008108744A9 - Dispositif de décongélation du refroidisseur d'air d'une vitrine de réfrigération d'équipement commercial - Google Patents

Dispositif de décongélation du refroidisseur d'air d'une vitrine de réfrigération d'équipement commercial Download PDF

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Publication number
WO2008108744A9
WO2008108744A9 PCT/UA2008/000007 UA2008000007W WO2008108744A9 WO 2008108744 A9 WO2008108744 A9 WO 2008108744A9 UA 2008000007 W UA2008000007 W UA 2008000007W WO 2008108744 A9 WO2008108744 A9 WO 2008108744A9
Authority
WO
WIPO (PCT)
Prior art keywords
heat
air cooler
evaporator
low
thawing
Prior art date
Application number
PCT/UA2008/000007
Other languages
English (en)
Russian (ru)
Other versions
WO2008108744A8 (fr
WO2008108744A1 (fr
Inventor
Oleg Antonenko
Oleksandr Dvornitsyn
Oleksandr Gudyma
Original Assignee
Obshchestvo S Ogranichennoi Ot
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 Obshchestvo S Ogranichennoi Ot filed Critical Obshchestvo S Ogranichennoi Ot
Priority to EA200801846A priority Critical patent/EA012195B1/ru
Priority to EP08724405.9A priority patent/EP2119986A4/fr
Publication of WO2008108744A1 publication Critical patent/WO2008108744A1/fr
Publication of WO2008108744A8 publication Critical patent/WO2008108744A8/fr
Publication of WO2008108744A9 publication Critical patent/WO2008108744A9/fr

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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
    • F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system

Definitions

  • the invention relates to refrigeration, in particular to devices for thawing an air cooler of a direct cooling system for refrigerated display cases, preferably low-temperature commercial refrigeration equipment with low-freezing coolants.
  • Thawing a snow coat from the surface of cooling devices of low-temperature refrigerated display cases of commercial refrigeration equipment, in most cases, is carried out by electric heaters. Less common is the method of thawing with hot refrigerant, which in the vapor state is sent directly from the compressor to the evaporator tubes coated with a snow coat.
  • Tubular electric heaters are installed in the holes of the ribs, in the pipes of the air cooler or placed next to it.
  • the method is very simple to implement, but requires significant energy costs, which is currently a serious disadvantage.
  • the quality of thawing leaves much to be desired due to uneven heating of the evaporator (problems of thermal contact between the evaporator and the electric heater), which forces general defrosting to be carried out once a month using warm water.
  • a separate closed circuit with the same coolant as in the main cold-transfer circuit is used to heat the coolant.
  • the coolant of a separate circuit is heated using a special heater (boiler) and a small centrifugal pump that pumps the hot coolant through a system of batteries to be thawed, bypassing the evaporator. Due to the good thermal contact between the surface of the batteries and the heated coolant, the defrost time is minimized.
  • a special heater blower
  • a small centrifugal pump that pumps the hot coolant through a system of batteries to be thawed, bypassing the evaporator. Due to the good thermal contact between the surface of the batteries and the heated coolant, the defrost time is minimized.
  • direct-cooled air coolers it is not possible to directly use the defrosting of the air cooler by passing heated coolant through its sections.
  • the proposed device for defrosting the air cooler can be used not only in the cabinets of low-temperature commercial refrigeration equipment, but also in medium-temperature showcases, both with an individual refrigeration unit and with a multi-compressor central refrigeration unit.
  • the proposed defrosting device of the air cooler can significantly reduce the thawing time (up to 6-10 minutes instead of 20-30 minutes) and reduce energy costs by using the heat of the system to heat a low-freezing coolant and relatively low power consumption of the pump.
  • the prior art From sources of scientific, technical and patent information, a number of methods and devices are known for thawing the heat transfer surface of cooling devices for direct and brine cooling of low-temperature commercial refrigeration equipment:
  • thawing of low-temperature refrigerated display cases of commercial refrigeration equipment is carried out using hot refrigerant vapors or electric heaters.
  • the device for thawing tube-fin air coolers with hot refrigerant vapor injected by the compressor into the air cooler includes a discharge pipe with a bypass line and an electromagnetic valve. When the solenoid valve opens, hot steam, bypassing the condenser, enters the air cooler. Defrosting 5 is carried out by the hot vapor of the refrigerant, which gives its heat to the cold air cooler and condenses. This defrosting device has several disadvantages.
  • low-freezing coolants are used - salt solutions, glycolic, organosilicon and organofluorine fluids.
  • Defrosting systems from the side of the intermediate coolant are mostly closed, with air coolers, of a closed type, in which the coolant does not come in contact with air.
  • a low-freezing coolant for thawing it is placed in a thermally insulated container with heating elements, and if there is a year-round heat source (hot water, steam) at the facility, instead of heating elements, coils are installed in the container with a heating medium, through which hot water or steam circulates.
  • the coolant heated to a temperature of 30 ... 40 0 C is pumped into the batteries to be thawed, or it is fed into the pipes of the air cooler (see Chervyakov CC, Kulakovsky A.I. Basics of refrigeration: Textbook. Handbook for SPTU - 2nd ed. ., revised and additional - M .: Higher school., 1988. - pp. 54, 62, as well as Kantorovich V.I., Yavnel B.K. Device, operation, installation and repair of refrigeration units Textbook: - M .: Publishing House of Trade Literature, 1960., p. 204 - 206).
  • a separate closed circuit is used with the same coolant as in the main cold-transfer circuit.
  • the coolant of a separate circuit is heated using a special heater (boiler), and a small centrifugal pump pumps the hot coolant through a system of batteries to be thawed, bypassing the evaporator. Due to good thermal contact between the surface of the batteries and the heated coolant, the defrost time is minimized.
  • thawing of finned air coolers is carried out using electric heaters (TENOV). Heated not only the heat exchange surface of the air cooler, but also the bottom of the display case and drain pipe. Tubular electric heaters are built into the holes of the ribs, in the pipes of the air cooler or placed next to them.
  • the defrost cycle begins when the solenoid valve in the liquid pipe is closed, as a result of which the air cooler is emptied, and then the compressor stops. At the same time, the electric heating elements of the air cooler, bottom and drain pipe are switched on. The fans turn off so that warm air does not enter the cooling space.
  • This device is selected by us as a prototype.
  • the prototype and the claimed invention have common features: - the presence of structural elements for supplying heat to the heat exchange surface of the evaporator of the air cooler, the bottom of the window and the drain pipe (the prototype is TENY);
  • the heat supply elements are in thermal contact with the heat exchange surface of the evaporator of the air cooler, with the bottom and with the drain pipe.
  • the disadvantage of defrosting by heating elements is their poor thermal contact with the tubular surface of the evaporator of the air cooler (mainly, point thermal contact).
  • the defrost time is 20-30 minutes, despite the high heating temperature of the heating elements (150-200 ° C).
  • the temperature in the cooled volume rises significantly, which, in turn, leads to a relatively long-term treatment of frozen products with warm air.
  • the basis of the invention is the task to create an improved device for thawing the air cooler of the refrigerated display case of commercial equipment, in which by introducing additional units and also by performing separate heat supply sources, it is possible to reduce the time of thawing and energy consumption during thawing of the air cooler of low-temperature display cases, shelves of commercial refrigeration equipment super - and hypermarkets.
  • a device for thawing the air cooler of a refrigerated display case of commercial equipment including elements for supplying heat to the heat exchange surface of the air cooler evaporator, to the bottom of the display case and to the drain pipe, in that it is additionally equipped with a heat accumulator with a low-freezing coolant, a low-freezing coolant circulation pump and a recuperative heat exchanger that receives the heat of the compressed refrigerant, and the elements are made in the form of two additional sections, the first of which is installed in the evaporator of the air cooler and is in thermal contact with its heat exchange surface, and the second additional section is installed in the bottom of the window next to the drain pipe, while both additional sections are connected to the heat accumulator.
  • the heat transfer surface of the first additional section is structurally identical to the heat transfer surface of the air cooler evaporator.
  • New in the claimed invention is that the device is additionally equipped with:
  • the novelty of the claimed invention also lies in the fact that the heat supply elements are made in the form of two additional sections, their location and the connection scheme between known and new nodes. From the sources of patent and scientific and technical information, thawing devices for air coolers of low-temperature showcases of commercial refrigeration equipment of super- and hypermarkets are not known, in which:
  • the elements of the heat supply for thawing the evaporator of the air cooler are made in the form of two additional sections, the first of which is installed in the evaporator, is structurally identical to the sections of the evaporator and is in thermal contact with its heat exchange surface, and the second is in the bottom of the display case and next to the drain pipe; 2. Both sections are connected by a thawing line with a heat accumulator with a low-freezing coolant;
  • the heat accumulator is connected by coolant circulation lines to a circulation pump for heating the heat carrier in a recuperative heat exchanger with compressor refrigerant vapor, and directing the heated coolant to both additional sections.
  • FIG. 1 is a schematic diagram of a device
  • FIG. 2 is a sectional view of a showcase.
  • the device for thawing the air cooler of the refrigerated display case of commercial equipment contains interconnected process pipelines:
  • Thawing the air cooler refrigerated display cases of low-temperature commercial refrigeration equipment is as follows. In cooling mode, the electronic unit (not shown in the drawing) turns on the compressor 1 of the refrigeration unit, opens the solenoid valves 12 and 15 with a continuously operating low-freezing coolant circulation pump 3.
  • Compressed refrigerant vapor is supplied by compressor 1 to a recuperative heat exchanger 2, where the compressed refrigerant is transferred by compressor 1 to heat to the low-freezing coolant supplied by the low-freezing coolant circulation pump 3 from the heat accumulator with the low-freezing coolant 4 through the open solenoid valve 13.
  • the heated solution from the recuperative heat exchanger 2 through the open solenoid valve 14 is returned to the heat accumulator with a low-freezing coolant 4.
  • the refrigerant from the recuperative heat exchanger 2 is sent to the condenser 5, and then to the receiver 6.
  • an air cooler 8 forms a snow coat, and the bottom of the display case 18 and the drain pipe 19 are overgrown with ice.
  • the electronic unit When defrosting the air cooler 8, the electronic unit turns off the compressor 1, the fans of the air cooler 8, closes the solenoid valves 13, 14, opens the solenoid valves 12 and 15, and the heated coolant from the heat accumulator 4 through the defrost line 16 enters the first 10 and second 11 additional sections of the air cooler 8
  • the snow coat melts as a result of heat exchange between the evaporator 9 and the first additional section 10, due to the high thermal conductivity of the ribs of the tubular surface of the evaporator 9.
  • the second additional Section 11 heats the bottom of the display case 18 and the drain pipe 19. Melt water from the air cooler flows into the bottom of the display window 18, connecting with the thawed water of the drain pipe 19, and is sent to the sewer.
  • Defrost time is 6 - 10 minutes.
  • the electronic unit turns off the electromagnetic valves 12, 15, turns on compressor 1, fans, opens solenoid valves 13, 14, and the showcase switches back to cooling mode. Further, the described sequence of actions is repeated. Industrial applicability.
  • the proposed device for thawing the air cooler of low-temperature showcases can also be used in direct cooling systems of medium-temperature commercial refrigeration equipment with both an individual refrigeration unit and a multi-compressor unit.
  • the defrosting device can significantly reduce the defrosting time to 6-10 minutes (compared to 20-30 minutes when defrosting with heating elements) and reduce the cost of electricity by using the internal heat of the device to heat a low-freezing coolant and relatively low power consumption of the pump.

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)
  • Defrosting Systems (AREA)
  • Freezers Or Refrigerated Showcases (AREA)

Abstract

L'invention concerne des équipements de réfrigération et notamment des systèmes de décongélation de vitrines de réfrigération équipée d'instruments de refroidissement direct, de préférence d'équipements de réfrigération commerciaux basse température, au moyen de caloporteurs à point de gel bas. Le dispositif comprend un accumulateur thermique avec un caloporteur à point de gel bas, une pompe de circulation de caloporteur à point de gel bas, un échangeur de chaleur par récupération et des éléments d'amenée de chaleur à la surface échangeuse de chaleur de la vitrine, au fond de la vitrine et à la canalisation d'évacuation, le tout raccordé ensemble. Les éléments d'amenée de chaleur se présentent comme deux sections dont la première est montée dans l'évaporateur du refroidisseur d'air et se trouve en contact thermique avec sa surface échangeuse de chaleur, et la deuxième section est montée dans le fond de la vitrine près de la canalisation d'évacuation. Les deux sections sont reliées à l'accumulateur thermique. Le dispositif permet de réduire le temps de décongélation et la consommation d'énergie électrique.
PCT/UA2008/000007 2007-03-06 2008-02-29 Dispositif de décongélation du refroidisseur d'air d'une vitrine de réfrigération d'équipement commercial WO2008108744A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EA200801846A EA012195B1 (ru) 2007-03-06 2008-02-29 Устройство оттаивания воздухоохладителя холодильной витрины торгового оборудования
EP08724405.9A EP2119986A4 (fr) 2007-03-06 2008-02-29 Dispositif de décongélation du refroidisseur d'air d'une vitrine de réfrigération d'équipement commercial

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
UAU200702478 2007-03-06
UAU200702478U UA25036U (en) 2007-03-06 2007-03-06 Defrosting system of refrigerated case of trade refrigeration equipment

Publications (3)

Publication Number Publication Date
WO2008108744A1 WO2008108744A1 (fr) 2008-09-12
WO2008108744A8 WO2008108744A8 (fr) 2008-11-13
WO2008108744A9 true WO2008108744A9 (fr) 2009-01-08

Family

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Application Number Title Priority Date Filing Date
PCT/UA2008/000007 WO2008108744A1 (fr) 2007-03-06 2008-02-29 Dispositif de décongélation du refroidisseur d'air d'une vitrine de réfrigération d'équipement commercial

Country Status (4)

Country Link
EP (1) EP2119986A4 (fr)
EA (1) EA012195B1 (fr)
UA (1) UA25036U (fr)
WO (1) WO2008108744A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5693932B2 (ja) * 2010-11-29 2015-04-01 高砂熱学工業株式会社 冷却システム、及び冷却方法
DE102015008325A1 (de) 2015-06-26 2016-12-29 Voss Automotive Gmbh Einrichtung und Verfahren zum Enteisen eines Wärmetauschers im Verdampferbetrieb einer Kälteanlage sowie Fahrzeug mit einer solchen Einrichtung
CN107589146B (zh) * 2017-08-25 2018-07-13 西安科技大学 高温矿井充填体蓄热释热实验模拟装置及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT331284B (de) * 1974-02-18 1976-08-10 Wein Gedeon Kuhlanlage
SU1402779A1 (ru) * 1985-09-03 1988-06-15 Брянский технологический институт Холодильна установка
US4766734A (en) * 1987-09-08 1988-08-30 Electric Power Research Institute, Inc. Heat pump system with hot water defrost
DE29617606U1 (de) * 1996-10-08 1996-11-28 Guentner Gmbh Hans Vorrichtung zur Energienutzung für Abtauzwecke in Kühlmittelkreisläufen
KR19990005704A (ko) * 1997-06-30 1999-01-25 배순훈 냉장고의 제상장치
US5987916A (en) * 1997-09-19 1999-11-23 Egbert; Mark System for supermarket refrigeration having reduced refrigerant charge
JP4342996B2 (ja) * 2004-03-25 2009-10-14 サンデン株式会社 ショーケース

Also Published As

Publication number Publication date
UA25036U (en) 2007-07-25
EA200801846A1 (ru) 2008-12-30
EP2119986A4 (fr) 2014-02-19
EA012195B1 (ru) 2009-08-28
EP2119986A1 (fr) 2009-11-18
WO2008108744A8 (fr) 2008-11-13
WO2008108744A1 (fr) 2008-09-12

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