US4660385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frost control for space conditioning
Assignee: Gas Technology Institute
•
Filing: 1984-12-28
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Granted: 1987-04-28
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Expires: 2004-12-28
Abstract
Abstract An apparatus and process for frost control for the ambient air heat exchanger of a space conditioning apparatus. The ambient air heat exchanger is immersed in a fluidized bed enhancing the heat transfer and physically reducing frost formation. In a preferred embodiment, the fluidized bed is supported by a support bed of non-fluidized solid particles. In one of the embodiments the particulate beds may be desiccant materials. The space conditioning apparatus and method of frost control of this invention permits smaller ambient air heat exchangers and accommodates greater transient conditions due to the enhanced heat transfer and physical prevention of ice formation resulting from the fluidized bed.
Inventors
- 👤 Robert A. Macriss
- 👤 Jaroslav Wurm
- 👤 Vincent M. Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:56
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/006; F28D; F28D13/00; F25; F25D; F25D2317/00; F25D2317/04; F25D2317/041; F25D2317/0411
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
172 words
In a freezer apparatus of the type having a refrigerant condenser exchanger to the exterior of the freezer closed space and a refrigerant evaporator exchanger inside the freezer closed space, the freezer operating at ambient air temperatures below about 0° C. in the vicinity of said refrigerant evaporator exchanger of said freezer, the improvement comprising: substantially vertical duct means defining a confined passage for said ambient air; support means extending substantially across said passage; a plurality of fluidizable solid particles sufficient to form a shallow fluidizable bed supported on top of said support means within said confined passage; blower means capable of blowing said ambient air through said fluidizable bed at a fluidizing velocity thereby forming a shallow fluidized bed of said solid particles, said shallow fluidized bed having a fluidized depth of about 0.25 to about 2 inches; and said refrigerant evaporator with extended surface heat exchange means immersed in said shallow fluidizable bed and connected to said freezer refrigerant system to provide passage of said refrigerant of said freezer therethrough.
Claim 2
Dependent Claim
172 words
In a freezer apparatus of the type having a refrigerant condenser exchanger to the exterior of the freezer closed space and a refrigerant evaporator exchanger inside the freezer closed space, the freezer operating at ambient air temperatures below about 0° C. in the vicinity of said refrigerant evaporator exchanger of said freezer, the improvement comprising: substantially vertical duct means defining a confined passage for said ambient air; support means extending substantially across said passage; a plurality of fluidizable solid particles sufficient to form a shallow fluidizable bed supported on top of said support means within said confined passage; blower means capable of blowing said ambient air through said fluidizable bed at a fluidizing velocity thereby forming a shallow fluidized bed of said solid particles, said shallow fluidized bed having a fluidized depth of about 0.25 to about 2 inches; and said refrigerant evaporator with extended surface heat exchange means immersed in said shallow fluidizable bed and connected to said freezer refrigerant system to provide passage of said refrigerant of said freezer therethrough.
Claim 3
Dependent Claim
45 words
The freezer apparatus of claim 1 wherein said support means comprises a plurality of non-fluidizable solid particles comprising a support bed on top of a distributor means for supporting said non-fluidizable support bed and for admitting and distributing said ambient air throughout said fluidizable bed.
Claim 4
Dependent Claim
20 words
The freezer apparatus of claim 2 additionally having a fine mesh screen separating said fluidizable bed from said support bed.
Claim 5
Dependent Claim
22 words
The freezer apparatus of claim 2 wherein said non-fluidized support bed has a depth of about 0.1 inch to about 0.5 inch.
Claim 6
Dependent Claim
22 words
The freezer apparatus of claim 2 wherein said non-fluidizable solid particles have mean particle diameters of about 0.5 to about 1.5 millimeters.
Claim 7
Dependent Claim
29 words
The freezer apparatus of claim 2 wherein the ratio of mean particle diameters of said non-fluidizable solid particles to said fluidizable solid particles is about 1 to about 10.
Claim 8
Dependent Claim
19 words
The freezer apparatus of claim 6 wherein said ratio of mean particle diameters is about 2.8 to about 4.8.
Claim 9
Dependent Claim
15 words
The freezer apparatus of claim 2 wherein said non-fluidizable solid support particles are ceramic solids.
Claim 10
Dependent Claim
14 words
The freezer apparatus of claim 2 wherein said non-fluidizable solid support particles are glass.
Claim 11
Dependent Claim
25 words
The freezer apparatus of claim 1 wherein said fluidizable bed has a depth, when in the fluidized state, of about 0.5 to about 0.75 inch.
Claim 12
Dependent Claim
22 words
The freezer apparatus of claim 1 wherein said fluidizable solid particles have mean particle diameters of about 0.06 to about 0.60 millimeters.
Claim 13
Dependent Claim
22 words
The freezer apparatus of claim 2 wherein said fluidizable solid particles have mean particle diameters of about 0.06 to about 0.60 millimeters.
Claim 14
Dependent Claim
13 words
The freezer apparatus of claim 1 wherein said fluidizable solid particles are silica.
Claim 15
Dependent Claim
13 words
The freezer apparatus of claim 1 wherein said fluidizable solid particles are alumina.
Claim 16
Dependent Claim
19 words
The freezer apparatus of claim 1 wherein said extended surface heat exchange means is a fin-tube heat exchange means.
Claim 17
Dependent Claim
19 words
The freezer apparatus of claim 2 wherein said extended surface heat exchange means is a fin-tube heat exchange means.
Claim 18
Dependent Claim
15 words
The freezer apparatus of claim 2 wherein said non-fluidizable solid particles are solid desiccant particles.
Claim 19
Independent Claim
123 words
A method of frost control on a refrigerant evaporator exchanger inside a freezer closed space operating at ambient air temperatures below about 0° C. comprising: passing said refrigerant of said freezer apparatus through said refrigerant evaporator exchanger having extended surface heat exchange means immersed in a shallow fluidizable bed supported by support means extending substantially across a substantially vertical duct; and passing said ambient air through said substantially vertical duct in thermal exchange relation to said refrigerant evaporator heat exchange means at sufficient velocity to fluidize said shallow bed to a fluidized depth of about 0.25 to about 2 inches thereby enhancing heat exchange between said refrigerant and said ambient air and reducing tendency of frost formation by physical vibration and abrasive action.
Claim 20
Independent Claim
123 words
A method of frost control on a refrigerant evaporator exchanger inside a freezer closed space operating at ambient air temperatures below about 0° C. comprising: passing said refrigerant of said freezer apparatus through said refrigerant evaporator exchanger having extended surface heat exchange means immersed in a shallow fluidizable bed supported by support means extending substantially across a substantially vertical duct; and passing said ambient air through said substantially vertical duct in thermal exchange relation to said refrigerant evaporator heat exchange means at sufficient velocity to fluidize said shallow bed to a fluidized depth of about 0.25 to about 2 inches thereby enhancing heat exchange between said refrigerant and said ambient air and reducing tendency of frost formation by physical vibration and abrasive action.
Claim 21
Dependent Claim
49 words
The method of frost control of claim 18 wherein said ambient air is passed through a plurality of non-fluidizable solid particles comprising a support bed on top of a distributor means for supporting said non-fluidizable support bed and for admitting and distributing said ambient air throughout said fluidizable bed.
Claim 22
Dependent Claim
24 words
The method of frost control of claim 19 wherein said non-fluidizable support bed has a depth of about 0.1 inch to about 0.5 inch.
Claim 23
Dependent Claim
31 words
The method of frost control of claim 19 wherein the ratio of mean particle diameters of said non-fluidizable solid particles to said fluidizable solid particles is about 1 to about 10.
Claim 24
Dependent Claim
21 words
The method of frost control of claim 18 wherein said extended surface heat exchange means is a fin-tube heat exchange means.
Claim 25
Dependent Claim
17 words
The method of frost control of claim 19 wherein said non-fluidizable solid particles are solid desiccant particles.
Claim 26
Dependent Claim
153 words
In a freezer apparatus of the type having a refrigerant condenser exchanger to the exterior of the freezer closed space and a refrigerant evaporator exchanger inside the freezer closed space, the freezer operating at ambient air temperatures below about 0° C. in the vicinity of said refrigerant evaporator exchanger of said freezer, the improvement comprising: substantially vertical duct means defining a confined passage for said ambient air; support means extending substantially across said passage; a plurality of fluidizable solid dessicant particles comprising a fluidizable bed supported on top of said support means within said confined passage; blower means capable of blowing said ambient air through said fluidizable bed at a fluidizing velocity thereby forming a fluidized bed of said solid particles; and said refrigerant evaporator with extended surface heat exchange means immersed in said fluidizable bed and connected to said freezer refrigerant system to provide passage of said refrigerant of said freezer therethrough.
Claim 27
Dependent Claim
153 words
In a freezer apparatus of the type having a refrigerant condenser exchanger to the exterior of the freezer closed space and a refrigerant evaporator exchanger inside the freezer closed space, the freezer operating at ambient air temperatures below about 0° C. in the vicinity of said refrigerant evaporator exchanger of said freezer, the improvement comprising: substantially vertical duct means defining a confined passage for said ambient air; support means extending substantially across said passage; a plurality of fluidizable solid dessicant particles comprising a fluidizable bed supported on top of said support means within said confined passage; blower means capable of blowing said ambient air through said fluidizable bed at a fluidizing velocity thereby forming a fluidized bed of said solid particles; and said refrigerant evaporator with extended surface heat exchange means immersed in said fluidizable bed and connected to said freezer refrigerant system to provide passage of said refrigerant of said freezer therethrough.
Claim 28
Dependent Claim
21 words
The freezer apparatus of claim 24 wherein said fluidized bed has a fluidized depth of abour 0.25 to about 2 inches.
Claim 29
Dependent Claim
45 words
The freezer apparatus of claim 24 wherein said support means comprises a plurality of non-fluidizable solid particles comprising a support bed on top of a distributor means for supporting said non-fluidizable support bed and for admitting and distributing said ambient air throughout said fluidizable bed.
Claim 30
Dependent Claim
22 words
The freezer apparatus of claim 26 wherein said non-fluidizable solid particles have mean particle diameters of about 0.5 to about 1.5 millimeters.
Claim 31
Dependent Claim
29 words
The freezer apparatus of claim 26 wherein the ratio of mean particle diameters of said non-fluidizable solid particles to said fluidizable solid particles is about 1 to about 10.
Claim 32
Dependent Claim
22 words
The freezer apparatus of claim 26 wherein said non-fluidizable solid support particles are selected from the group consisting of ceramic and glass.
Claim 33
Dependent Claim
41 words
The freezer apparatus of claim 24 wherein said fluidizable solid particles have mean particle diameters of about 0.06 to about 0.60 millimeters and said fluidized bed has a depth, when in the fluidized state, of about 0.5 to about 0.75 inch.
Claim 34
Independent Claim
97 words
A method of frost control on a refrigerant evaporator exchanger inside a freezer closed space operating at ambient air temperatures below about 0° C. comprising: passing said refrigerant of said freezer apparatus through said refrigerant evaportor exchanger having extended surface heat exchange means immersed in a fluidized bed of desiccant particles; and passing said ambient air in thermal exchange relation to said refrigerant evaporator heat exchange means at sufficient velocity to fluidize said bed thereby enhancing heat exchange between said refrigerant and said ambient air and reducing tendency of frost formation by physical vibration and abrasive action.
Claim 35
Independent Claim
97 words
A method of frost control on a refrigerant evaporator exchanger inside a freezer closed space operating at ambient air temperatures below about 0° C. comprising: passing said refrigerant of said freezer apparatus through said refrigerant evaportor exchanger having extended surface heat exchange means immersed in a fluidized bed of desiccant particles; and passing said ambient air in thermal exchange relation to said refrigerant evaporator heat exchange means at sufficient velocity to fluidize said bed thereby enhancing heat exchange between said refrigerant and said ambient air and reducing tendency of frost formation by physical vibration and abrasive action.
Claim 36
Dependent Claim
23 words
The method of frost control of claim 31 wherein said fludized bed has a fluidized depth of about 0.25 to about 2 inches.
Claim 37
Dependent Claim
49 words
The method of frost control of claim 31 wherein said ambient air is passed through a plurality of non-fluidizable solid particles comprising a support bed on top of a distributor means for supporting said non-fluidizable support bed and for admitting and distributing said ambient air throughout said fluidizable bed.
Claim 38
Dependent Claim
24 words
The method of frost control of claim 33 wherein said non-fluidizable support bed has a depth of about 0.1 inch to about 0.5 inch.
Claim 39
Dependent Claim
24 words
The method of frost control of claim 33 wherein said non-fluidizable solid particles have mean particle diameters of about 0.5 to about 1.5 millimeters.
Claim 40
Dependent Claim
43 words
The method of frost control of claim 31 wherein said fluidizable solid particles have mean particle diameters of about 0.06 to about 0.60 millimeters and said fluidized bed has a depth, when in the fluidized state, of about 0.5 to about 0.75 inch.
Claim 41
Dependent Claim
28 words
The method of frost control of claim 18 wherein said fluidized bed has a fluidized depth, when in the fluidized state, of about 0.5 to about 0.75 inch.
References Cited (Backward Citations)
US2852545A
Cited
GB860105A
Cited
US3912002A
Cited
US3814176A
Cited
SU754195A1
Cited
SU821849A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |