US5333469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for efficiently controlling refrigeration and air conditioning systems
Assignee: EnviroSystems Corp
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Filing: 1993-06-25
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Granted: 1994-08-02
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Expires: 2013-06-25
Abstract
Abstract A refrigeration control system is disclosed for operating a refrigeration system in a very efficient manner by controlling the refrigerant pressure in the refrigerant line between the liquid receiver and the evaporator at a pressure which is just above that at which bubbles ("flashgas") occur. An electronic sight glass is used to detect such flashgas bubbles in that liquid refrigerant line thereby indicating that more cooling capacity is required to properly operate the refrigeration system. The system controller can efficiently control various refrigeration components such that the electrical power drawn by the compressor motor is at an optimal or near-optimal rate of consumption at any given cooling requirement within the refrigeration system's cooling capacity. Some of the devices that can be controlled by the system controller include condenser fans, pressure control valves, reciprocating compressors, and screw compressors.
Inventors
- 👤 Gordon C. Hullar
- 👤 Jerry F. Justice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:12
CPC Classifications
F; F25; F25B; F25B41/00; F25B41/006; F25B41/20; F25B49/00; F25B49/02; F25B49/027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condensor, a liquid receiver, an evaporator, at least one constant speed fan associated with said condensor, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one constant speed fan by controlling its staging on or off, in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 2
Independent Claim
141 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condensor, a liquid receiver, an evaporator, at least one constant speed fan associated with said condensor, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one constant speed fan by controlling its staging on or off, in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 3
Independent Claim
145 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condensor, a liquid receiver, an evaporator, at least one variable-speed fan associated with said condensor, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one variable-speed fan by controlling its selective staging on or off and by controlling its speed, in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 4
Independent Claim
145 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condensor, a liquid receiver, an evaporator, at least one variable-speed fan associated with said condensor, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one variable-speed fan by controlling its selective staging on or off and by controlling its speed, in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 5
Independent Claim
145 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condenser, a liquid receiver an evaporator, at least one multi-speed fan associated with said condenser, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one multi-speed fan by controlling its selective staging on or off and by controlling its speed, in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 6
Independent Claim
145 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condenser, a liquid receiver an evaporator, at least one multi-speed fan associated with said condenser, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one multi-speed fan by controlling its selective staging on or off and by controlling its speed, in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 7
Independent Claim
181 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condenser, a liquid receiver, an evaporator, at least one constant speed fan associated with said condenser and at least one variable-speed fan associated with said condenser, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one constant speed fan by controlling its selective staging on or off, and selectively controlling the operation of said at least one variable-speed fan by controlling its selective staging on or off and by controlling its speed, both acts of controlling in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 8
Independent Claim
181 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condenser, a liquid receiver, an evaporator, at least one constant speed fan associated with said condenser and at least one variable-speed fan associated with said condenser, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one constant speed fan by controlling its selective staging on or off, and selectively controlling the operation of said at least one variable-speed fan by controlling its selective staging on or off and by controlling its speed, both acts of controlling in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 9
Independent Claim
181 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condenser, a liquid receiver, an evaporator, at least one constant speed fan associated with said condenser and at least one multi-speed fan associated with said condenser, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one constant speed fan by controlling its selective staging on or off, and selectively controlling the operation of said at least one multi-speed fan by controlling its selective staging on or off and by controlling its speed, both acts of controlling in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
Claim 10
Independent Claim
181 words
A method of controlling the operation of a refrigeration system of the type that includes a compressor, a condenser, a liquid receiver, an evaporator, at least one constant speed fan associated with said condenser and at least one multi-speed fan associated with said condenser, and at least one refrigerant line, said method comprising the steps of: (a) monitoring the presence of flashgas bubbles in a liquid refrigerant of the refrigeration system and creating an electrical signal upon the sensing of flashgas bubbles in said refrigerant line; (b) communicating said electrical signal to a system controller; and (c) selectively controlling the operation of said at least one constant speed fan by controlling its selective staging on or off, and selectively controlling the operation of said at least one multi-speed fan by controlling its selective staging on or off and by controlling its speed, both acts of controlling in response to said electrical signal communicated to said system controller so as to reduce or eliminate said flashgas bubbles in the liquid refrigerant, while simultaneously limiting energy consumption to an optimal or near-optimal rate.
References Cited (Backward Citations)
US2483102A
Cited
US2649013A
Cited
US2621487A
Cited
US2869330A
Cited
US3090222A
Cited
US3412570A
Cited
US3449051A
Cited
US3450476A
Cited
US3390539A
Cited
US3797940A
Cited
US3853174A
Cited
US4167858A
Cited
US4136528A
Cited
US4326387A
Cited
US4284352A
Cited
US4286873A
Cited
US4381895A
Cited
US4328682A
Cited
US4586828A
Cited
US4535603A
Cited
US4644755A
Cited
US4710643A
Cited
US4902202A
Cited
US4882928A
Cited
US5072595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |