US3898864A - Refrigeration evaporator coil - Google Patents
Refrigeration evaporator coil Download PDFInfo
- Publication number
- US3898864A US3898864A US470762A US47076274A US3898864A US 3898864 A US3898864 A US 3898864A US 470762 A US470762 A US 470762A US 47076274 A US47076274 A US 47076274A US 3898864 A US3898864 A US 3898864A
- Authority
- US
- United States
- Prior art keywords
- air
- inlet area
- frost
- area
- inlet
- 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
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 20
- 238000001816 cooling Methods 0.000 claims description 34
- 235000013305 food Nutrition 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011044 inertial separation Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- 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
Definitions
- frost collecting cavity Located adjacent to the second air inlet area and on the opposite side thereof from the restrictive opening is a frost collecting cavity.
- the restriction between the first and second inlet areas is so arranged that the frost which is airborne as it passes through the restriction is carried by inertia forces into the frost collecting cavity.
- Air cooling coils in refrigeration equipment are normally held at a temperature below the frost point of the incoming air.
- frost builds up on the coils particularly in the region where the air impinges on the coils at the air inlet area.
- This frost build-up at the air inlet is quite rapid when the moisture content of the incoming air is high.
- the frost builds up, the passage of air through the air inlet area is restricted sufficiently to make the air cooling coils ineffective. This problem is quite serious in the case of evaporator coils of open display cases of the type used in retail merchandizing refrigerated foods.
- the coils and the fins on the coils used to cool the air become rapidly coated with frost to such a thickness as to prevent air flow through the evaporator. When this happens, the air ceases to circulate and it is necessary to defrost the evaporator. During the defrost cycle, the air is not properly cooled. It is usual practice to inject heat energy into the coils during the defrost cycle and this increases the cost of operating the air refrigeration system. It is therefore desirable that the cooling period between the defrost cycles be as long as possible in order to minimize the number of expensive defrost cycles.
- bypass opening is located in the refrigerated space and this creates a change in the air temperatures and air circulation as the frost builds up on the inlet area of the refrigeration coils.
- the present invention relates to apparatus permitting an increase in the cooling period between defrost cycles in refrigeration systems.
- air cooling means having a primary air inlet area that is subject to stoppage of air movement by frost buildup and providing such a cooling means with a second inlet area that becomes effective on stoppage of the first inlet area.
- the invention contains provision for a restricted air passage through which air passes when the first inlet area is closed by frost into a plenum chamber and from the plenum chamber through the second inlet air area.
- the plenum chamber also has a frost collecting cavity into which airborne frost is propelled.
- the invention also relates to air cooling apparatus for food refrigerated display cabinets in which the air flow through the cabinet is subjected to only minimal disturbance as the result of frost build-up on the air cooling coils and one which permits a maximum cooling period between defrost cycles.
- FIGURE in the drawing represents a cross section of a refrigerated food display case 2 having a refrigerated area in which food items 6 supported by a support shelf 12 are displayed. 13 may be glass sliding doors or other conventional access means to the refrigerated display area. Air from the display area 4 is exhausted through the passages 14 and 15 around the support 12 and then passes through cooling coils 16 and up the passage 8 through the air discharge grille 10 to complete circuit into the refrigerated area 4-.
- 2 is a refrigerated display case of the type normally used in retail food stores for the display of refrigerated or frozen meat and other foodstuff.
- the case as illustrated has sliding glass doors 13 for access to the refrigerated space 4.
- the meat or foodstuff 6 is placed on a support 12 which may be of either solid or perforated material. Air is exhausted from the refrigerated space 4 through passages 14 and I5 surrounding the support 12 into a plenum chamber 18.
- Air propulsion means 20 here shown as an electric fan is used to move the air from the plenum chamber 18 into the air conducting conduit 22 by maintaining the air pressure in the conduit 22 above the pressure in the plenum chamber 18.
- the air cooling means 16 is here shown as an evaporator coil having a vertical dimension of approximately 4 inches and a dimension from front to back of approximately 16 inches with the dimension of the case depending on the size of the case. If the case is a standard 54 inchcase,'the evaporator 16 will be approximately 48 inches long.
- the primary or first air inlet area 24 is therefore approximately 4 inches high as is the air outlet area 26.
- the second inlet area 28 is 12 inches from front to back and therefore has approximately 3 times the area of the primary inlet area 24.
- the restrictive bypass 30 between the first and second inlet area in the preferred embodiment is /2 inch and runs the length of the evaporator coil 16 and therefore has approximately /s the area of the first air inlet area 24 or 1/24 the area of the second inlet area 28.
- the restriction 30 lies in the same plane as the first inlet area 24 so that the air coming through this /2 inch slot travels across the surface of the second inlet area 28 toward the frost collecting cavity 32.
- This frost collecting cavity is approximately 3 inches deep and runs the length of the air cooling means 16.
- the plenum chamber 34 is approximately 3 inches high and runs the length of the air cooling means or evaporator 16.
- the air cooling means 16 having a dimension of 4 inches by 16 inches by approximately 48 inches and is of standard design OPERATION OF THE PREFERRED EMBODIMENT OF THE INVENTION Referring tothe FIGURE, the operation of the present invention is as follows. Air is exhausted from the chamber 18 by means of the air propulsion means 20 .here shown asan electric fan into an air conditioning conduit 22 which includes an air cooling means 16. After the defrosting cycle when the air cooling means '16 here shown as an evaporator is fully clear of frost, air enters the first air inlet area 24 and passes through the air cooling means 16 and out the air outlet 26 at a lower temperature than that at which it entered. The air then passes up the conduit 8 through the diffuser back through the refrigerated area 4 into the plenum chamber 18 where the air circulation cycle is repeated.
- frost builds up on the first air inlet area 24
- pressure' is built up in the plenum chamber 36 and as this pressure builds up an increasing volume of the circulated air passes through the restrictive opening 30 which has approximately Vs the cross section area of the first inlet area 24.
- This frost builds up on the air inlet area 24, it'becomes plugged and the ent-Ire circulated volume of the air passes through the /2 inch air restriction 30'into a second plenum chamber 34.
- the velocity of the air through the restriction 30 is sufficient when the air inlet area 24 is plugged to cause airborne frost to be thrown across the second inlet area 28 into the frost collecting cavity 32 as the air makes a 90 turn and enters the air cooling means 16 through the second inlet area 28.
- This inlet 28 is approximately 3 times the cross section area of the air inlet 24 and this together with the inertial separation of the frost particles from the air and collection in the cavity 32 results in only a very slow buildup of frost on the coils and fins in the air inlet area 28.
- the air coming through the air inlet 28 is cooled by the air cooling means 16 and exhausted through the air outlet area 26 and afterwards proceeds up the air conduit 28 and through the plenum chamber 9 and diffuser 10 into the refrigerated area 4 and thence to the plenum chamber 18 where the air circulation cycle begins anew.
- the refrigeration cycle becomes inoperative as soon as the air inlet area 24 is plugged with frost.
- This bypass 30 permits the air to enter a second air inlet area 28 into the air cooling means and thus, extends the effective cooling period severalfold. This extension of the cooling period is lengthened even a greater amount by the inertial rejection of the frost particles from the air stream into the frost collecting cavity 32 so that this airborne frost is no longer available to plug the second air inlet area 28.
- the 'period between the defrost cycles is lengthened severalfold without appreciably lengthening the time period of the defrost cycle.
- cool air is permitted to flow over the refrigerated material in the display case for longer periods of time, thus minimizing the deterioration of the quality of the foodstuff displayed in the case 2.
- Air refrigeration apparatus including: an air conducting conduit, an air propulsion means capable of circulating air through said conduit, an air cooling means located in said conduit having a first air inlet area, a second air inlet area and an air outlet area, said first inlet area being located in a plane normal to the direction of air flow through said conduit, said second air inlet area being located in a plane normal to said first inlet area, restriction means between said first and second air inlet areas, a plenum chamber lying between said restriction means and said second air inlet area, whereby in the absence of frosting conditions, the major volume of the air flows through said first inlet area and when, said first inlet becomes clogged with frost the restriction means permits a greater'volume of the air to flow through said second inlet area to said cooling element to thereby, provide for entry of air into said cooling element when the first inlet area becomes clogged with frost.
- Air refrigerating apparatus as claimed in claim 1 having:
- Air refrigeration apparatus as claimed in claim 1 in which: including:
- the cross section area of the air restriction means bea frost collecting cavity in said plenum chamber.
- Air refrigeration apparatus as claimed in claim 5 less than Va the cross section area of said first air 5 in which: inlet area. said restriction means is located at one end of said 4. Air refrigeration apparatus as claimed in claim 1 plenum chamber, in which: said frost collecting cavity is located in the other end said restriction means between said first and said secof said plenum chamber and,
- 0nd air inlet areas lies in a plane parallel to the 10 said second inlet area is located between said restricplane of said first inlet and normal to the plane of tion means and said frost collecting cavity.
Abstract
Description
Claims (6)
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US470762A US3898864A (en) | 1974-05-17 | 1974-05-17 | Refrigeration evaporator coil |
DE19752516601 DE2516601A1 (en) | 1974-05-17 | 1975-04-16 | EVAPORATOR COIL FOR REFRIGERATING PURPOSES WITH AIR REFRIGERATOR |
ZA00752412A ZA752412B (en) | 1974-05-17 | 1975-04-16 | Refrigeration evaporator coil |
CA225,327A CA1029974A (en) | 1974-05-17 | 1975-04-18 | Refrigeration evaporator coil |
ES437018A ES437018A1 (en) | 1974-05-17 | 1975-04-25 | Refrigeration evaporator coil |
AR258614A AR210077A1 (en) | 1974-05-17 | 1975-05-02 | IMPROVEMENT IN SHOWCASES FOR REFRIGERATED EXPOSURE |
GB1893475A GB1440057A (en) | 1974-05-17 | 1975-05-06 | Air refrigeration apparatus |
BR3478/75A BR7502724A (en) | 1974-05-17 | 1975-05-06 | AIR COOLING APPLIANCE |
BE156252A BE828955A (en) | 1974-05-17 | 1975-05-12 | AIR REFRIGERATION UNIT |
FR7514851A FR2271523A1 (en) | 1974-05-17 | 1975-05-13 | |
JP50057542A JPS50160856A (en) | 1974-05-17 | 1975-05-16 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US470762A US3898864A (en) | 1974-05-17 | 1974-05-17 | Refrigeration evaporator coil |
Publications (1)
Publication Number | Publication Date |
---|---|
US3898864A true US3898864A (en) | 1975-08-12 |
Family
ID=23868929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US470762A Expired - Lifetime US3898864A (en) | 1974-05-17 | 1974-05-17 | Refrigeration evaporator coil |
Country Status (11)
Country | Link |
---|---|
US (1) | US3898864A (en) |
JP (1) | JPS50160856A (en) |
AR (1) | AR210077A1 (en) |
BE (1) | BE828955A (en) |
BR (1) | BR7502724A (en) |
CA (1) | CA1029974A (en) |
DE (1) | DE2516601A1 (en) |
ES (1) | ES437018A1 (en) |
FR (1) | FR2271523A1 (en) |
GB (1) | GB1440057A (en) |
ZA (1) | ZA752412B (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5333447A (en) * | 1976-09-10 | 1978-03-29 | Hitachi Ltd | Heat exchanging device |
US4295340A (en) * | 1979-02-14 | 1981-10-20 | Tyler Refrigeration Corporation | Refrigerated display case having ambient air defrost |
US4314453A (en) * | 1979-07-25 | 1982-02-09 | Tyler Refrigeration Corporation | One and a half band refrigerated display case |
USRE31909E (en) * | 1979-02-14 | 1985-06-11 | Tyler Refrigeration Corporation | Refrigerated display case having ambient air defrost |
US4977754A (en) * | 1990-05-01 | 1990-12-18 | Specialty Equipment Companies, Inc. | Next-to-be-purchased cold beverage merchandiser |
US20030140638A1 (en) * | 2001-08-22 | 2003-07-31 | Delaware Capital Formation, Inc. | Refrigeration system |
US20030205053A1 (en) * | 2001-08-22 | 2003-11-06 | Mark Lane | Service case |
US20050081551A1 (en) * | 2003-10-21 | 2005-04-21 | Delaware Capital Formation, Inc. | Modular refrigeration system |
US20070062209A1 (en) * | 2003-06-04 | 2007-03-22 | Industrie Scaffalature Arredamenti-Isa S.P.A. | Display case for foods |
US11116333B2 (en) | 2019-05-07 | 2021-09-14 | Carrier Corporation | Refrigerated display cabinet including microchannel heat exchangers |
US11559147B2 (en) | 2019-05-07 | 2023-01-24 | Carrier Corporation | Refrigerated display cabinet utilizing a radial cross flow fan |
US11906209B2 (en) | 2020-02-19 | 2024-02-20 | Hill Phoenix, Inc. | Thermoelectric cooling system |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57164270A (en) * | 1982-02-26 | 1982-10-08 | Sanyo Electric Co | Refrigerator box |
JPS58135448U (en) * | 1982-03-04 | 1983-09-12 | 三菱重工業株式会社 | Coke transport vehicle for volatile gas recovery |
IT8453663V0 (en) * | 1984-07-23 | 1984-07-23 | Ferrero Spa | EXHIBITOR FOR REFRIGERATED PRODUCTS PARTICULARLY FOR THE EXHIBITION OF REFRIGERATED FOOD PRODUCTS ON STORE SHOPS AND NEAR THE STORES AND SUPERMARKET STORES |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2810267A (en) * | 1956-04-16 | 1957-10-22 | C V Hill & Company Inc | Refrigerated display case |
US3012413A (en) * | 1958-01-25 | 1961-12-12 | Sir George Godfrey & Partners | Refrigeration systems |
US3364696A (en) * | 1966-07-28 | 1968-01-23 | Amana Refrigeration Inc | Refrigeration apparatus with air flow bypass means |
US3638449A (en) * | 1970-04-15 | 1972-02-01 | Whirlpool Co | Refrigeration apparatus |
-
1974
- 1974-05-17 US US470762A patent/US3898864A/en not_active Expired - Lifetime
-
1975
- 1975-04-16 DE DE19752516601 patent/DE2516601A1/en active Pending
- 1975-04-16 ZA ZA00752412A patent/ZA752412B/en unknown
- 1975-04-18 CA CA225,327A patent/CA1029974A/en not_active Expired
- 1975-04-25 ES ES437018A patent/ES437018A1/en not_active Expired
- 1975-05-02 AR AR258614A patent/AR210077A1/en active
- 1975-05-06 GB GB1893475A patent/GB1440057A/en not_active Expired
- 1975-05-06 BR BR3478/75A patent/BR7502724A/en unknown
- 1975-05-12 BE BE156252A patent/BE828955A/en unknown
- 1975-05-13 FR FR7514851A patent/FR2271523A1/fr not_active Withdrawn
- 1975-05-16 JP JP50057542A patent/JPS50160856A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2810267A (en) * | 1956-04-16 | 1957-10-22 | C V Hill & Company Inc | Refrigerated display case |
US3012413A (en) * | 1958-01-25 | 1961-12-12 | Sir George Godfrey & Partners | Refrigeration systems |
US3364696A (en) * | 1966-07-28 | 1968-01-23 | Amana Refrigeration Inc | Refrigeration apparatus with air flow bypass means |
US3638449A (en) * | 1970-04-15 | 1972-02-01 | Whirlpool Co | Refrigeration apparatus |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5333447A (en) * | 1976-09-10 | 1978-03-29 | Hitachi Ltd | Heat exchanging device |
US4295340A (en) * | 1979-02-14 | 1981-10-20 | Tyler Refrigeration Corporation | Refrigerated display case having ambient air defrost |
USRE31909E (en) * | 1979-02-14 | 1985-06-11 | Tyler Refrigeration Corporation | Refrigerated display case having ambient air defrost |
US4314453A (en) * | 1979-07-25 | 1982-02-09 | Tyler Refrigeration Corporation | One and a half band refrigerated display case |
US4977754A (en) * | 1990-05-01 | 1990-12-18 | Specialty Equipment Companies, Inc. | Next-to-be-purchased cold beverage merchandiser |
US20030140638A1 (en) * | 2001-08-22 | 2003-07-31 | Delaware Capital Formation, Inc. | Refrigeration system |
US20030205053A1 (en) * | 2001-08-22 | 2003-11-06 | Mark Lane | Service case |
US20030213260A1 (en) * | 2001-08-22 | 2003-11-20 | Mark Lane | Service case |
US6883343B2 (en) * | 2001-08-22 | 2005-04-26 | Delaware Capital Formation, Inc. | Service case |
US6889514B2 (en) | 2001-08-22 | 2005-05-10 | Delaware Capital Formation, Inc. | Service case |
US6981385B2 (en) | 2001-08-22 | 2006-01-03 | Delaware Capital Formation, Inc. | Refrigeration system |
US20070062209A1 (en) * | 2003-06-04 | 2007-03-22 | Industrie Scaffalature Arredamenti-Isa S.P.A. | Display case for foods |
US20050081551A1 (en) * | 2003-10-21 | 2005-04-21 | Delaware Capital Formation, Inc. | Modular refrigeration system |
US7159413B2 (en) | 2003-10-21 | 2007-01-09 | Delaware Capital Formation, Inc. | Modular refrigeration system |
US11116333B2 (en) | 2019-05-07 | 2021-09-14 | Carrier Corporation | Refrigerated display cabinet including microchannel heat exchangers |
US11559147B2 (en) | 2019-05-07 | 2023-01-24 | Carrier Corporation | Refrigerated display cabinet utilizing a radial cross flow fan |
US11906209B2 (en) | 2020-02-19 | 2024-02-20 | Hill Phoenix, Inc. | Thermoelectric cooling system |
Also Published As
Publication number | Publication date |
---|---|
AR210077A1 (en) | 1977-06-30 |
ES437018A1 (en) | 1977-01-01 |
ZA752412B (en) | 1976-03-31 |
BE828955A (en) | 1975-09-01 |
BR7502724A (en) | 1976-04-13 |
JPS50160856A (en) | 1975-12-26 |
CA1029974A (en) | 1978-04-25 |
DE2516601A1 (en) | 1975-11-27 |
GB1440057A (en) | 1976-06-23 |
FR2271523A1 (en) | 1975-12-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: BANKERS TRUST COMPANY Free format text: SECURITY INTEREST;ASSIGNOR:TYLER REFRIGERATION CORPORATION;REEL/FRAME:004905/0001 Effective date: 19880624 |
|
AS | Assignment |
Owner name: AMERICAN STANDARD INC. Free format text: MERGER;ASSIGNOR:TYLER REFRIGERATION CORPORATION, A DE CORP.;REEL/FRAME:005094/0674 Effective date: 19760211 |
|
AS | Assignment |
Owner name: TYLER REFRIGERATION CORPORATION, A CORP. OF DE Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANKER S TRUST COMPANY;REEL/FRAME:005853/0427 Effective date: 19910918 Owner name: AMERICAN STANDARD, INC. Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANKER S TRUST COMPANY;REEL/FRAME:005853/0398 Effective date: 19910918 |
|
AS | Assignment |
Owner name: TYLER REFRIGERATION CORPORATION, A CORP. OF DE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN STANDARD INC., A CORP. OF DE;REEL/FRAME:005872/0085 Effective date: 19910924 |
|
AS | Assignment |
Owner name: BANKERS TRUST COMPANY, NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:TYLER REFRIGERATION CORPORATION, A CORP. OF DE;REEL/FRAME:005891/0361 Effective date: 19910930 |
|
AS | Assignment |
Owner name: TYLER REFRIGERATION CORPORATION, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN STANDARD INC. A DE CORP.;REEL/FRAME:006209/0485 Effective date: 19910924 |