US3572052A - Ducted refrigeration unit - Google Patents
Ducted refrigeration unit Download PDFInfo
- Publication number
- US3572052A US3572052A US824934A US3572052DA US3572052A US 3572052 A US3572052 A US 3572052A US 824934 A US824934 A US 824934A US 3572052D A US3572052D A US 3572052DA US 3572052 A US3572052 A US 3572052A
- Authority
- US
- United States
- Prior art keywords
- coil
- air
- chambers
- refrigerant
- hot gas
- 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.)
- Expired - Lifetime
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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
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
- A47F3/0439—Cases or cabinets of the open type
- A47F3/0443—Cases or cabinets of the open type with forced air circulation
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
-
- 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
-
- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/021—Alternate defrosting
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/22—Refrigeration systems for supermarkets
-
- 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
Definitions
- the invention relates to a ducted refrigeration s 1 1111.01 F25b 47/00 unit f continuously Supplying quantities of refrigerated air to [50] Field of Search 62/81, 278, a group of refrigerated food display cases.
- the unit has two 9 1 234 chambers arranged in parallel with a cooling coil disposed in each chamber.
- a liquid refrigerant is selectively and alternate- References cued ly supplied to one coil during the time a hot defrosting gas is UNITED STATES PATENTS supplied to the other coil.
- Damper means alternately direct 1,859,427 5/1932 Bulkeley 62/278 circulating air through the chamber in which the coil thereof is 2,254,420 9/1941 Cleveland 62/283 supplied with a liquid refrigerant while bypassing the chamber 2,481,348 9/1949 Ringquist 62/278 in which he coil th re is ng fr CHECK VALVE DAMPER (CONTROLLED av V DEFROST TIMER COOLING cou. R5115 co l3 RETURN AIR FROM (01' GAS or ELECTRIC) REFRIGERA'I'ED DISPLAY CASES AIR MOVING DEVICE BLOWER, AIR COMPRESSOR, ET.
- the invention relates to -a "new and. improved ducted refrigeration unit for continuously supplying quantities of refrigerated cooling air to a group of refrigerated display cases.
- refrigerated display case found in supermarkets has cooling coils installed in the display case and liquid refrigerant is supplied to the coils through pipes from remotely located refrigeration apparatus.
- This type of refrigerated display case is distinguishable from the more common type wherein refrigeration apparatus comprising a compressor and motor unit and evaporator coils are self-contained in the display case.
- a ducted refrigeration system The type of refrigeration systemto which the present invention pertains is referred to herein as a ducted refrigeration system.
- a ducted closed circuit system cool air is supplied from a remotelylocated refrigeration unit through ductwork to. a group of display cases.
- the refrigerated air supplied is warmed upon passing through the display cases and is returned through other ductwork to the refrigeration apparatus where it is recooled and the cycle is repeated.
- the display cases so serviced are normally of the air curtain type which provides a moving curtain of air to-isolate the interior of the cases from the surrounding atmosphere.
- the air curtain principle is of a nature such that a portion of the air circulating in the air circulating system is lost to the atmosphere while some atmospheric air is picked up by the curtain and is thereby drawn into the circulating system.
- the atmospheric air drawn in by the air curtain is relatively humid and readily condenses on the evaporator coils in the system.
- the buildupof frost on the, coils causes the air circulation to be gradually restricted, with less and less air being cooled, until the temperature of the ,air delivered to the display cases has risen above the desired level.
- a defrost cycle is then required to remove-the accumulated ice and frost from the coil surface.
- thetemperature of The assembly or unit 1 described thus far is an element of a generally closed circuit refrigeration system in which cooled air is supplied through the outlet pipe 8 to one or more food display cases (not shown) and from which relatively'warmer and more humid air is returned to the unit 1 through the inlet pipe 7.
- the air moving device 6 supplies the motive power for circulating the air.
- Unit 1 has in the interior thereof a partition 12, illustrated as being in a generally horizontal plane, which divides the interior of unit 1 into chambers 13 and 14.
- Partition 12 is in spaced relation to the inlet and outlet ends of the unit 1 and, at opposite ends of the unit, dampers l6 and 17 are pivotally connected to the partition so that inlet air may be directed selectively to either the chamber 13 or the chamber 14, as desired.
- Dampers l6 and 17 are illustrated in positions which would permit air to be directed from inlet pipe 7,'through chamber 14, to outlet pipe 8.
- Unit 1 may desirably be insulated so that chambers 13 and 14 are insulated from the surrounding atmosphere and from each other.
- Chambers 13 and 14 are provided with coils 20 and 21, respectively, and outlet pipe 8 is provided with a coil 22. Inlet and outlet portions of these coils extend externally of the unit the circulating air tends to rise above the level and cause damage to the products in the display cases being serviced, thereby shortening the shelflives of the products.
- a ducted refrigeration unit having two chambers arranged in parallel with a cooling coil disposed in each chamber. Damper means are provided so that the circulating air is selectively directed through one or the other of the chambers.
- either one of the coils in one chamber, through which air is being circulated may be supplied with.
- cooled air may be continuously supplied to display cases in required quantities, by switching back and forth between the two chambers, with no interruptions for defrosting cycles.
- a main object of the invention is to provide a new and improved ducted refrigeration unit for supplying cooled air in required quantities with no interruptions for defrosting cycles.
- a ducted refrigeration unit 1 to which the present invention pertains has a housing which includes acyliridrically shaped middle portion 2 and frustoconically-shaped end portions 3 and 4. At the inlet end of the unit 1, adjoining housing portion 3 is attached an air moving device 6, such as an air blower or air compressor, having an air inlet pipe 7 4 At the opposite end of the unit 1 is attached an air outlet pipe 8.
- an air moving device 6 such as an air blower or air compressor
- housing and pipe members referred to above are of sheet metal construction and, as it is only a schematic showing that is illustrated, specific shapes are referred to only for convenience of description in that-a variety of other shapes could be utilized within the scope of the invention.
- Coils 20 and 21 have relatively wide fin spacing on the upstream sides thereof and relatively narrow fin spacing on the downstream sides thereof.
- Display cases serviced by the refrigeration unit 1 have specific requirements as to the temperature of the air utilized for preserving their contents which ranges from about F. for butter, cheese and eggs to 20 F. for ice cream. There are also varying requirements for the relative humidity of the air in some instances with regard to some products, as in the case of fresh vegetables, which would become dried out with too little moisture in the air and would be subject to spoilage if there is too much moisture in the air.
- circulating air is dehumidified, cooled, reheated and ducted to and from a group of display cases.
- one of the coils 20 or 21 is supplied with a liquid cooling refrigerant during which time the other coil may be supplied with a hot gas defrosting refrigerant.
- Cooling and defrosting cycles are alternated between chambers 13 and 14 by an electric timer 26 which functions to control the dampers 16 and 17 and various refrigeration apparatus valves for controlling the flow of coolv ing and hot gas defrosting refrigerants to the coils 20 and 21 and the flow of hot gas refrigerant to the coil 22.
- the air is first dehumidified by its traversing the wide fin portion of the 20 or 21 and then cooled by its traversing the narrow fin portion of the same coil. Heat may be added to the air as it traverses coil 22 in outlet pipe 8, if desired or necessary, to provide a high degree of control relative to the temperature and humidity of the air.
- the refrigeration apparatus utilized in connection with the unit 1 included a compressor 30, a condenser 31, and a liquid refrigerant receiver 32.
- a conduit 33 connects compressor 30 with condenser 31 and a conduit 34 connects condenser 31 to receiver 32.
- a refrigerant liquid supply line 38 has one end thereof connected to the receiver 32 and is connected through parallel branches 39 and 40 thereof, respectively, to the inlets of coils 20 and 21 in chambers 13 and 14.
- the suction line of compressor 30 is provided with a suction header 42 to which the outlets. of coils 20 and 21 are connected respectively through parallel conduits 43 and 44.
- Each of the coils 20 and 21 has the usual thermostatic expansion-type valve 47 associated therewith for regulating the amount of liquid refrigerant to be admitted to the coils during the normal refrigeration cycle for the respective coil. Conduits tures in coils 20 and 21 but these functions of these valves have no bearing on the invention.
- Refrigerant liquid supply line 38 has a solenoid controlled valve 48 disposed therein which is open during the normal refrigeration cycle,
- a conventional refrigeration cycle may be performed relative to each coil 20 and 21.
- Compressor 30 compresses a gaseous refrigerant which flows to the condenser 31 where the refrigerant is condensed to a liquid and flows through the liquid supply line 34 to the receiver 32.
- the timer 26 causes dampers 16 and 17 to move to the positions illustrated and causes the opening of valve 46 and the closing of valve 45.
- Liquid refrigerant then flows from the receiver 32 through the normally open solenoid valve 48 to the coil 21 through the liquid supply line branch 40 and the thermostatic expansion valve 47 therein.
- the liquid refrigerant is expanded through the expansion valve 46 and enters the coil 21.
- the expandediand evaporated refrigerant then leaves the coil 21 and is drawn through the return conduit 44, in gaseous fonn, to the suction header 42 and the suction inlet of the compressor 30.
- the defrosting cycle for alternately defrosting the coils 20 and 21 requires certain additional apparatus as will be described.
- the cycling involved is controlled by the timing mechanism 26 and the timing programming will of course vary for different installations.
- An example of the programming would be to have the dampers l6 and 17 change at 30 minute intervals such that the cooling function would be performed by each coil 20 and 21 during alternate 30 minute intervals. During each 30 minute period the other coil would be defrosted for a period of time up to 30 minutes.
- the programming relative to defrosting would be set for a lesser period such as or minutes which would be the actual time needed to complete the defrosting of a coil.
- each of the conduits 39 and 40 is provided with a bypass around the thermostatic expansion valve 46 therein.
- Compressor discharge line 33 has two hot gas conduits 53 and 54 individually connected thereto and the opposite ends of these hot gas conduits are connected respectively to conduits 43 and 44 at points between the coils and 21 and the valves 45 and 46.
- Respectively disposed in the hot gas conduits 53 and 54 are solenoidoperated valves 56 and 57.
- a pressure sensing and responsive switch 60 In association with liquid supply valve 48 there is provided a pressure sensing and responsive switch 60.
- a sensing tube 61 is connected to and extends from switch 60 to liquid supply line 39 on the downstream side of valve 48.
- the switch 60 in turn is electrically connected to valve 48 with a wire 62 for operating valve 48.
- Timing or clock unit 26 has electrical connections (not shown) with the solenoid operated valves 45 and 46, the solenoid operated valves 56 and 57, the solenoid operated valve 48 and valve regulator 60.
- the defrosting operations in the il-. 'lustrated embodiment of the invention are based on predetermined time intervals although other known methods for determining defrosting times could also be used within the scope of the invention. It may be assumed for purposes of illustration that the timing unit 26 is set to allow the refrigeration cycle described above with respect to coil 21 to operate for a period of 30 minutes and then effect defrosting of the coil 21 while allowing previously defrosted coil 20 to provide cooling for the system.
- the refrigerant used is R-12 traversing the evaporator 21 the hot gas loses heat to the coil to cause defrosting thereof and, in the process, condenses and becomes a cold liquid.
- the liquified refrigerant flows out of coil 21 through line 51 and the check valve 52 thereof, and into the branch liquid supply line 39.
- the valve 48 is closed during the defrosting operation, except under certain conditions as noted hereinafter, the condensed refrigerant resulting from the defrosting of coil 21 is available .to provide cooling for coil 20 in the same manner as the liquid refrigerant supplied through valve 48 during the part of the cycle during which time there is no defrosting operation of either coil 20 or 21.
- the liquid refrigerant from coil 21 thus flows to coil 20 where the refrigerant is vaporized and returned to the suction header 42 through line 43 in the same manner as during the normal refrigeration cycle.
- the purpose in having the main liquid supply valve 48 closed during the above-described defrosting operation is that the condensed liquid may be removed quickly from the coil being defrosted so that the defrosting can be accomplished very efficiently.
- the condensed refrigerant from the coil being defrosted is utilized to provide cooling for the other coil.
- the refrigerant R-l2 has a normal condensing pressure of about 117 p.s.i.g. and, if that is the refrigerant to be used, the pressure in the liquid supply line should not be allowed to drop below ll7 p.s.i.g. during a defrosting operation. ln the system of the present invention the pressure of the refrigerant in the liquid supply line 38 during a defrosting operation, when the valve 48 is closed, is dependentupon a number of variables such as the sizes of the coils and the lengths of the piping runs, for example.
- the defrosting cycle described above would always operate with the pressure in the line 38 being higher than the condensing pressure of the refrigerant being used.
- the pressure in the line 38 may at times fall below the desired pressure of the liquid refrigerant and, in order to provide an antidote for that type of operating condition, the valve regulator 60 is provided.
- the sensing tube 61 senses the pressure in the line 38 and the regulator 60, which is devised to override the effect of the timing unit 26 on the valve 48, is adjusted to open the valve 48 whenever the pressure in line 38 drops below the preset pressure of the refrigerant being used.
- the regulating feature performed by the regulator 60 may not be needed and in such instances that feature may be omitted.
- a ducted refrigeration unit comprising two parallel chambers having a common inlet duct and a common outlet duct, damper means for selectively channeling air through one or the other of said chambers from said inlet duct to said outlet duct, an evaporator coil in each of said chambers, each of said evaporator coils having a plurality of relatively closely spaced fins on one end thereof and a plurality of less closely spaced fins at the other end thereof, said closely spaced iins being on the downstream end of each of said evaporator coils, refrigeration apparatus for supplying a condensed liquid refrigerant and a noncondensed hot gas refrigerant, valve means for selectively and alternately controlling the supply of said liquid refrigerant and said hot gas refrigerant to said evaporators, and control means for said valve means and said damper means to selectively direct air from said inlet duct to a first one of said chambers while directing said liquid refrigerant to one of said evaporators in said first one of said
- said air heating means is a coil, said hot directed to flow through said coil.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
Description
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82493469A | 1969-05-15 | 1969-05-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3572052A true US3572052A (en) | 1971-03-23 |
Family
ID=25242691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US824934A Expired - Lifetime US3572052A (en) | 1969-05-15 | 1969-05-15 | Ducted refrigeration unit |
Country Status (5)
Country | Link |
---|---|
US (1) | US3572052A (en) |
AU (1) | AU1435870A (en) |
DE (1) | DE2022797A1 (en) |
FR (1) | FR2042663B3 (en) |
GB (1) | GB1244579A (en) |
Cited By (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3732703A (en) * | 1970-06-29 | 1973-05-15 | Rinipa Ab | Air conditioning plant for buildings |
US3750415A (en) * | 1972-03-01 | 1973-08-07 | Peuchen Inc | Method and apparatus for drying a gas and chilling it to low temperatures |
WO1981000147A1 (en) * | 1979-07-02 | 1981-01-22 | Regenerator Corp | Oxygen reduction system and condenser apparatus with automatic defrost |
JPS5723768A (en) * | 1980-07-17 | 1982-02-08 | Fuji Electric Co Ltd | Defrosting operation control of refrigerating plant |
US4365480A (en) * | 1978-09-05 | 1982-12-28 | United Air Specialists, Inc. | Process gas treating apparatus |
EP0128108A2 (en) * | 1983-06-01 | 1984-12-12 | Carrier Corporation | Apparatus and method for defrosting a heat exchanger in a refrigeration circuit |
US4711094A (en) * | 1986-11-12 | 1987-12-08 | Hussmann Corporation | Reverse cycle heat reclaim coil and subcooling method |
US4928498A (en) * | 1985-11-08 | 1990-05-29 | Ewald Gossler | Method and device for compression of gases |
EP0410138A1 (en) * | 1989-07-24 | 1991-01-30 | Societe Des Produits Nestle S.A. | Compact food package display refrigerator |
GB2209823B (en) * | 1987-09-10 | 1991-09-04 | Toshiba Kk | Air conditioning apparatus having two refrigerating circuits in central unit and control method of defrosting |
WO1992020542A1 (en) * | 1991-05-13 | 1992-11-26 | Reefco Manufacturing Corporation | Refrigerated container |
US5226285A (en) * | 1989-12-18 | 1993-07-13 | Danhard, Inc. | Self-cleaning heat exchanger fan assembly and controls |
US5315837A (en) * | 1992-02-04 | 1994-05-31 | M. C. International | Process for supplying cold to an open refrigerated enclosure for display and sale of fresh products in a supermarket |
US5417076A (en) * | 1993-11-16 | 1995-05-23 | Reefco Manufacturing Corporation | Cooling system automatically configurable to operate in cascade or single compressor mode |
US5425244A (en) * | 1993-11-16 | 1995-06-20 | Reefco Manufacturing Corporation | Double circuited evaporator cooling system automatically configurable to operate in cascade or single compressor mode |
US5447038A (en) * | 1993-11-16 | 1995-09-05 | Reefco Manufacturing Corporation | Apparatus for simultaneously providing multiple temperatures using an automatically configurable cooling system having both cascade and single compressor modes |
WO1996021130A1 (en) * | 1995-01-05 | 1996-07-11 | British United Shoe Machinery Limited | Chillers |
US5687579A (en) * | 1994-09-12 | 1997-11-18 | Vaynberg; Mikhail M. | Double circuited refrigeration system with chiller |
US5704221A (en) * | 1993-12-02 | 1998-01-06 | Mcinternational | Refrigeration exchanger, method for control thereof and cooling installation including such exchanger |
US5799728A (en) * | 1996-04-30 | 1998-09-01 | Memc Electric Materials, Inc. | Dehumidifier |
US5809798A (en) * | 1996-09-26 | 1998-09-22 | Cornerstone Technologies, Ltd. | Refrigerated container with controlled air distribution |
US5839292A (en) * | 1996-08-31 | 1998-11-24 | Lg Electronics, Inc. | Defroster for heat pump |
US5890368A (en) * | 1996-11-14 | 1999-04-06 | Lakdawala; Ness | Dehumidifier |
US5899079A (en) * | 1997-04-10 | 1999-05-04 | Gross-Given Manufacturing Company | Damper apparatus for refrigerated vending machines with a defrost cycle |
US6021644A (en) * | 1998-08-18 | 2000-02-08 | Ares; Roland | Frosting heat-pump dehumidifier with improved defrost |
EP1586837A1 (en) * | 2004-04-16 | 2005-10-19 | Electrolux Home Products Corporation N.V. | Refrigerator apparatus with freezer compartment and simplified defrosting device |
US20050235666A1 (en) * | 2004-04-27 | 2005-10-27 | Davis Energy Group, Inc. | Integrated dehumidification system |
US20060117768A1 (en) * | 2004-11-02 | 2006-06-08 | Suwon Lee | Defrost apparatus of refrigerator |
US20060144060A1 (en) * | 2004-12-30 | 2006-07-06 | Birgen Daniel J | Heat exchanger liquid refrigerant defrost system |
EP1699322A1 (en) * | 2003-12-22 | 2006-09-13 | Carrier Corporation | Evaporator for medium temperature refrigerated merchandiser |
WO2007061420A1 (en) * | 2005-11-28 | 2007-05-31 | Carrier Commercial Refrigeration, Inc. | Refrigerated case |
EP1855071A2 (en) * | 2006-05-11 | 2007-11-14 | Aisberg Ltd | Continuous air cooling method for medium-temperature refrigerating displays of shop equipment |
US20090142458A1 (en) * | 2007-11-30 | 2009-06-04 | Mccann Kevin | Portable electric cooler |
US20090242185A1 (en) * | 2008-03-31 | 2009-10-01 | Haseldine Jr Michael Cyril | Heat exchanger door system with movable door |
US20100043482A1 (en) * | 2006-10-27 | 2010-02-25 | Jae Gon Kim | Air cooling device of integrated thermo-hygrostat |
WO2010131257A2 (en) | 2009-03-15 | 2010-11-18 | Surendra Himatlal Shah | Energy efficient frost free sub-zero air conditioner |
US8109101B2 (en) * | 2006-10-23 | 2012-02-07 | Carrier Corporation | Heating, ventilation, air conditioning and refrigeration system with multi-zone monitoring and diagnostics |
US8397522B2 (en) | 2004-04-27 | 2013-03-19 | Davis Energy Group, Inc. | Integrated dehumidification system |
US20140352341A1 (en) * | 2012-02-28 | 2014-12-04 | Panasonic Corporation | Vehicle air conditioner |
US9200829B2 (en) | 2013-09-24 | 2015-12-01 | Walter Stark | Low temperature cooling and dehumidification device with reversing airflow defrost for applications where cooling coil inlet air is above freezing |
US9541324B2 (en) | 2013-09-24 | 2017-01-10 | Walter Stark | Low temperature cooling and dehumidification device with reversing airflow defrost for dehumidification and water generation applications where cooling coil inlet air is above freezing |
US9857123B2 (en) | 2015-08-06 | 2018-01-02 | John D. Mclaughlin | System and method for defrosting a condensor without external heating |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984003138A1 (en) * | 1983-02-03 | 1984-08-16 | Orion Machinery Co Ltd | Defrosting apparatus for gas cooling device |
IT227797Y1 (en) * | 1992-02-24 | 1998-01-21 | Bocchini Spa | REFRIGERATOR COUNTER, WITH CONSTANT TEMPERATURE DEFROST, FOR BULK FOOD PRODUCTS |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1859427A (en) * | 1932-05-24 | bulkeley | ||
US2254420A (en) * | 1939-01-24 | 1941-09-02 | Arthur L Layden | Refrigerating apparatus |
US2481348A (en) * | 1946-08-21 | 1949-09-06 | Trane Co | Air-conditioning apparatus with defrosting means |
US2932955A (en) * | 1958-12-31 | 1960-04-19 | Schaefer Inc | Gravity-flow open-topped refrigerated display cabinet |
US3063252A (en) * | 1961-08-17 | 1962-11-13 | Lamb Frank Gilbert | Upright refrigerator showcase |
US3067592A (en) * | 1962-12-11 | figure | ||
US3119239A (en) * | 1961-08-18 | 1964-01-28 | American Air Filter Co | Method and apparatus for cooling and drying air |
US3499295A (en) * | 1968-06-17 | 1970-03-10 | Emhart Corp | Refrigeration system |
-
1969
- 1969-05-15 US US824934A patent/US3572052A/en not_active Expired - Lifetime
-
1970
- 1970-04-27 AU AU14358/70A patent/AU1435870A/en not_active Expired
- 1970-05-09 DE DE19702022797 patent/DE2022797A1/en active Pending
- 1970-05-14 GB GB23532/70A patent/GB1244579A/en not_active Expired
- 1970-05-15 FR FR707017852A patent/FR2042663B3/fr not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1859427A (en) * | 1932-05-24 | bulkeley | ||
US3067592A (en) * | 1962-12-11 | figure | ||
US2254420A (en) * | 1939-01-24 | 1941-09-02 | Arthur L Layden | Refrigerating apparatus |
US2481348A (en) * | 1946-08-21 | 1949-09-06 | Trane Co | Air-conditioning apparatus with defrosting means |
US2932955A (en) * | 1958-12-31 | 1960-04-19 | Schaefer Inc | Gravity-flow open-topped refrigerated display cabinet |
US3063252A (en) * | 1961-08-17 | 1962-11-13 | Lamb Frank Gilbert | Upright refrigerator showcase |
US3119239A (en) * | 1961-08-18 | 1964-01-28 | American Air Filter Co | Method and apparatus for cooling and drying air |
US3499295A (en) * | 1968-06-17 | 1970-03-10 | Emhart Corp | Refrigeration system |
Cited By (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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Also Published As
Publication number | Publication date |
---|---|
DE2022797A1 (en) | 1970-11-19 |
GB1244579A (en) | 1971-09-02 |
FR2042663A7 (en) | 1971-02-12 |
AU1435870A (en) | 1971-10-28 |
FR2042663B3 (en) | 1973-03-16 |
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