EP2361027A1 - Open front display case with secondary air curtain - Google Patents
Open front display case with secondary air curtainInfo
- Publication number
- EP2361027A1 EP2361027A1 EP09832302A EP09832302A EP2361027A1 EP 2361027 A1 EP2361027 A1 EP 2361027A1 EP 09832302 A EP09832302 A EP 09832302A EP 09832302 A EP09832302 A EP 09832302A EP 2361027 A1 EP2361027 A1 EP 2361027A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- airflow
- outlet
- case
- refrigerated
- heat exchanger
- 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.)
- Granted
Links
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
- A47F3/0439—Cases or cabinets of the open type
- A47F3/0443—Cases or cabinets of the open type with forced air circulation
- A47F3/0447—Cases or cabinets of the open type with forced air circulation with air curtains
Definitions
- the disclosure relates to refrigerated cases. More particularly, the disclosure relates to open front cases/merchandisers.
- U.S. Patent No. 6,722,149 titled “Refrigerated Display Merchandiser” discloses an open front case wherein a secondary air curtain flow of ambient air is passed downward in front of the refrigerated curtain flow.
- the use of a secondary curtain flow may encourage a greater proportion of the refrigerated curtain flow to recirculate and with a reduced heat transfer to the recirculated portion of the refrigerated curtain flow from the ambient air.
- U.S. Patent No. 7,162,882 titled “Multi-Band Air Curtain Separation Barrier” discloses an open front case having two secondary air curtains. A first secondary air curtain passes downward in front of the refrigerated air curtain and is formed by a return airflow drawn from in front of the inlet/return.
- a second secondary air curtain flow of ambient air is directed across the opening in front of the first secondary flow.
- the first secondary flow can thus be somewhat cooler than the second secondary flow and yet further reduce heat transfer to the return flow.
- a refrigerated case having a base.
- a refrigerated compartment is above the base.
- a rear wall and a top are along the refrigerated compartment.
- a refrigeration system includes a heat absorption heat exchanger and a first fan.
- the first fan is positioned to drive an airflow from a first inlet across the heat absorption heat exchanger.
- a first portion of the airflow passes through the rear wall and top to exit a first outlet.
- a second fan is positioned to drive a second airflow from a second inlet to exit a second outlet.
- the second airflow bypasses the heat absorption heat exchanger.
- a diversion port is positioned to direct a second portion of the first airflow to merge with the second airflow upstream of the second outlet.
- the heat absorption heat exchanger and first fan may be in the base.
- the case may be implemented as a reengineering of an existing case configuration or a remanufacturing of an existing case.
- FIG. 1 is a schematic representation of a perspective view of a refrigerated case according to an exemplary embodiment.
- FIG. 2 is a schematic representation of a side sectional view of the case according to the embodiment of FIG. 1.
- FIG. 3 is a schematic representation of a sectional view of a prior art case top.
- FIG. 4 is a schematic representation of a sectional view of a first top for the case according to the embodiment of FIG. 1.
- FIG. 5 is a schematic representation of a sectional view of a second top for the case according to the embodiment of FIG. 1.
- FIG. 6 is a graphical representation of a percentage of the primary airflow diverted to velocity ratio according to an exemplary embodiment.
- FIG. 7 is a graphical representation of mixed temperature and relative humidity to percentage of primary airflow diverted according to an exemplary embodiment.
- FIG. 8 is a graphical representation of load reduction and secondary airflow temperature reduction to percentage of primary airflow diverted according to an exemplary embodiment.
- FIG. 1 shows a refrigerated case 20.
- the case 20 (see also FIG. 2) extends from a first (e.g., left as viewed by a consumer facing the case) end 22 to a second (right) end 24.
- the case has a front 26 and a rear 28.
- the exemplary front 26 has an opening 30 to a refrigerated compartment 32.
- the opening may extend from an upper end 34 proximate a top 36 to a lower end 38 proximate a base 40 below the compartment.
- the base 40 may contain portions of the refrigeration equipment (discussed below).
- FIG. 2 shows the compartment 32 in front of the front surface 42 of a rear wall structure 44.
- the rear wall structure 44 includes a rear duct 46 section.
- the exemplary compartment 32 is also below a lower surface 48 of a top/upper wall structure 50 which contains a top duct section 52.
- the top duct section 52 extends from a junction with the upper end of the rear duct section 46.
- the compartment 32 contains a vertical array of shelves 60.
- Each exemplary shelf 60 extends from a rear end/edge 62 at the rear wall 44 to a front end/edge 64.
- Each exemplary shelf 60 has an upper surface 66 which may support refrigerated products 68 (e.g., food, beverages, and the like).
- the refrigeration system's compressor 70 and heat rejection heat exchanger (e.g., gas cooler or condenser) 72 may be located in the case base 40.
- a fan (not shown) may force an airflow across the condenser 72.
- Alternative implementations may involve one or more of the refrigeration system components being remote. For example, a single remote central compressor and condenser may deliver refrigerant to multiple display cases.
- the expansion device 76 and heat absorption heat exchanger (e.g., evaporator) 78 may also be located in the base 40.
- a fan 80 may be in the base 40 to drive a recirculating airflow 500 along a flowpath 510.
- the airflow 500 enters the base at an inlet/return 82 proximate the lower end 38 of the opening 30.
- portions 502 may be vented into the compartment as branch flows to flow over/around the product 68 to cool the product. The remainder of the flow 500 reaches the top duct section 52.
- the air flow generally passes along a first leg 510-1 of the flowpath 510 within the base and through the evaporator 78 so as to be cooled.
- the airflow 500 then flows upward through the rear duct section 46 along a second leg 510-2.
- Minus the branch flows 502 (if any) the airflow 500 then flows forward (as shown in FIG. 3) along a third leg 510-3 through the top duct section 52.
- the flow is discharged from an outlet 90 (e.g., as a discharge flow 504).
- the flow 504 may interact/communicate with the secondary curtain flow 506.
- the secondary curtain flow 506 is discharged from a second outlet 92 immediately ahead/forward of the outlet 90.
- the outlet 92 is immediately behind a header 94 (e.g., containing lights 96).
- the secondary curtain flow 506 is provided by a secondary airflow 508 driven through a secondary duct 100 by a second fan 102.
- the exemplary secondary duct 100 is formed as part of the case top structure 50 above the top duct section 52.
- the exemplary secondary duct 100 and associated flowpath have an inlet 104.
- the inlet 104 is proximate the rear of the case top.
- FIG. 4 shows a modified case top according to one exemplary embodiment based upon the baseline version of FIG. 3.
- the flow 500 is further split by a baffle 106 into a first portion 512 (along a first branch 520) which passes out the outlet 90 as a refrigerated air curtain 504'.
- a second portion 514 is diverted (along a second branch or passageway 522) to merge with the secondary airflow 508 to form the secondary air curtain/flow 506' (to precool the secondary air curtain flow relative to the flow 508). Because the airflow 500 is refrigerated, the secondary curtain/flow 506' will be colder than the prior art secondary curtain/flow 506.
- the exemplary flow 514 is introduced to the flow 508 via an opening/port 120 (diversion port) upstream of the outlet 92.
- a deflector 122 may be positioned to help block the flow 508 from flowing into the passageway 522.
- the exemplary deflector extends downward from an upper edge of the port 120 that may be formed of a non-metal or other relatively insulative material so as to limit opportunities for condensation on the deflector due to the temperature differences between the flow 508 on one side and the flow 514 on the other side.
- FIG. 5 shows a top 202 of a case 200 which, except as otherwise described, may be similar to the case 20.
- the baffle 204 is oriented or otherwise configured to converge the branch 522' toward the port 206.
- the convergence increases the speed of the flow 514' exiting the outlet 206 relative to the flow 514.
- This increased speed causes increased mixing potentially resulting in a more uniform flow 506" relative to the FIG. 4 flow 506'.
- the increased speed is also intended to reduce the chance of flow reversal through the branch/passageway 522'.
- the vertical axis represents the percentage of the airflow 500 that is diverted and mixed with the secondary airflow 508 to produce the pre-cooled secondary airflow 5067506" for different airflow ratios shown on the horizontal axis.
- the airflow ratio is defined as the ratio of the mixed secondary air curtain/flow 506/506" average velocity to the refrigerated air curtain/flow 5047504" average velocity and different ratios are obtained depending upon the airflow volumetric flow rates and opening widths (outlet areas).
- Exemplary rates of the total primary airflow 500 and secondary airflow 508 are near parity (e.g., the airflow 500 is between half and twice the airflow 508, more narrowly, 80-120%).
- the primary and secondary opening widths are the same while the total primary airflow 500 is 8% less than the secondary airflow 508.
- Thermodynamics requires that both mass and energy be conserved as the diverted flow at 34°F (1.1°C) and relative humidity of 90% is mixed with airflow 508 at an ambient temperature of 75°F (23.9°C) and 55% relative humidity.
- FIG. 7 shows the impact to the mixed secondary airflow 5067506" temperature and relative humidity for the percent (%) of diverted airflow shown in FIG 6.
- FIG. 8 shows infiltration and total cooling load reductions of a secondary air curtain operating with the temperature and moisture levels of FIG 7. While the presence of a secondary air curtain will reduce the amount of interface shearing/mixing between the primary air curtain and the secondary air curtain, this interaction is not entirely eliminated. By pre-cooling the secondary air curtain, the temperature difference between the primary air curtain and the secondary air curtain is reduced and for the same shearing/mixing, less infiltration will occur.
- the FIG. 8 right side vertical axis shows the secondary air curtain temperature reduction for the percent (%) of diverted flow of FIGS. 6 and 7.
- Exemplary diversions from the flow 500 are effective to divert the flow 514/514' as approximately 5-40% (more narrowly 15-25%) of the remainder of the flow 500 reaching the baffle 106/204 or 1-12% (more narrowly 3-10% or 4-7%) of the initial flow 500 through the heat absorption heat exchanger.
- the exemplary flow 514/514' is effective to reduce the temperature of the secondary curtain flow 5067506" at least approximately 2°F (1.1°C) below the temperature of the flow 508 (more narrowly 5°F-8°F (2.8°C-4.4°C)).
- elements shown as integrally formed may be constructed of multiple parts or elements, the plenum and its inlets, outlets, and airflow devices may be arranged in any suitable manner or otherwise varied.
- the length or width of the structures and/or members or connectors or other elements of the case may be varied.
- the elements and/or assemblies of the refrigerated case may be constructed from any of a wide variety of materials that provide sufficient strength or durability, in any of a wide variety of colors, textures and combinations. Accordingly, all such modifications are intended to be included within the scope of the appended claims. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the preferred and other exemplary embodiments without departing from the spirit of the appended claims.
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Freezers Or Refrigerated Showcases (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12140808P | 2008-12-10 | 2008-12-10 | |
PCT/US2009/064577 WO2010068367A1 (en) | 2008-12-10 | 2009-11-16 | Open front display case with secondary air curtain |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2361027A1 true EP2361027A1 (en) | 2011-08-31 |
EP2361027A4 EP2361027A4 (en) | 2012-10-31 |
EP2361027B1 EP2361027B1 (en) | 2017-03-29 |
Family
ID=42243023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09832302.5A Not-in-force EP2361027B1 (en) | 2008-12-10 | 2009-11-16 | Open front display case with secondary air curtain |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2361027B1 (en) |
CN (1) | CN102245059B (en) |
WO (1) | WO2010068367A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2612574B1 (en) * | 2012-01-06 | 2014-05-14 | UAB Freor LT | Refrigeration unit |
US10028594B2 (en) | 2013-03-12 | 2018-07-24 | Hussmann Corporation | Merchandiser with merged air discharge |
US10646054B2 (en) * | 2016-03-31 | 2020-05-12 | Panasonic Intellectual Property Management Co., Ltd. | Showcase and operation method thereof |
US10016071B2 (en) * | 2016-05-31 | 2018-07-10 | Pepsico, Inc. | Product merchandising systems and methods |
CA3225988A1 (en) * | 2021-07-13 | 2023-01-19 | Hussmann Corporation | Refrigerated merchandiser with tunable airflow discharge |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1863579A (en) * | 1932-06-21 | Method and apparatus of air conditioning | ||
US2630684A (en) * | 1950-02-11 | 1953-03-10 | Sherer Gillett Company | Refrigerated multiple shelf display case |
JPS51134963A (en) * | 1975-05-20 | 1976-11-22 | Fuji Electric Co Ltd | Method for defrost operation of cold-air circulation type open showcas e |
US5357767A (en) * | 1993-05-07 | 1994-10-25 | Hussmann Corporation | Low temperature display merchandiser |
US6722149B1 (en) | 2003-01-07 | 2004-04-20 | Carrier Commercial Refrigeration, Inc. | Refrigerated display merchandiser |
US7162882B2 (en) * | 2003-01-07 | 2007-01-16 | Carrier Corporation | Multi-band air curtain separation barrier |
-
2009
- 2009-11-16 EP EP09832302.5A patent/EP2361027B1/en not_active Not-in-force
- 2009-11-16 CN CN200980149938.7A patent/CN102245059B/en not_active Expired - Fee Related
- 2009-11-16 WO PCT/US2009/064577 patent/WO2010068367A1/en active Application Filing
Non-Patent Citations (3)
Title |
---|
No further relevant documents disclosed * |
None * |
See also references of WO2010068367A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2361027B1 (en) | 2017-03-29 |
CN102245059A (en) | 2011-11-16 |
EP2361027A4 (en) | 2012-10-31 |
CN102245059B (en) | 2014-03-19 |
WO2010068367A1 (en) | 2010-06-17 |
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