US3780941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning system and method
Assignee: MCFARLAN A I CO Inc OF NEW JER
•
Filing: 1972-06-29
•
Granted: 1973-12-25
•
Expires: 1992-06-29
Abstract
Abstract A central air conditioning system insures acceptable operating conditions over a wide range of heat loads. Air at a controlled temperature and uniform pressure is supplied through high pressure ducts to the vicinity of each of the various zones of the building. The air for each zone then flows from the high pressure duct through a pressure-reduction box or pressure regulator to a low pressure duct from which the air is discharged through variable volume outlets which are thermostatically controlled so that they supply reduced quantities of air at reduced loads. The pressure regulator controls the flow of air from the high pressure duct system to each low pressure duct so as to regulate the air pressure in the low pressure duct. The pressure regulator is controlled by the air temperature in the zone of its low pressure duct so that under low load conditions the air pressure in the low pressure duct is reduced below the pressure in that duct under high load conditions.
Inventors
- 👤 S Blackwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:13
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F24F3/0442; F24F3/0444; G; G05; G05D; G05D23/00; G05D23/185
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
In an air conditioning system, the combination of, means to condition and distribute conditioned air at an elevated pressure to a plurality of zones through main distribution ducts and thence through a zone distribution duct for each of a plurality of zones, variable-volume diffuser means to discharge air from each of said zone distribution ducts into its zone, pressurereduction means for each of said zones connected to receive conditioned air from one of said main distribution ducts and to discharge it at a reduced pressure into the respective zone distribution duct, and thermostatic means for each zone responsive to the air temperature in that zone and operative to control said pressure-reduction means and said diffuser means for that zone and thereby regulate the volume of air being diffused.
Claim 2
Dependent Claim
128 words
In an air conditioning system, the combination of, means to condition and distribute conditioned air at an elevated pressure to a plurality of zones through main distribution ducts and thence through a zone distribution duct for each of a plurality of zones, variable-volume diffuser means to discharge air from each of said zone distribution ducts into its zone, pressurereduction means for each of said zones connected to receive conditioned air from one of said main distribution ducts and to discharge it at a reduced pressure into the respective zone distribution duct, and thermostatic means for each zone responsive to the air temperature in that zone and operative to control said pressure-reduction means and said diffuser means for that zone and thereby regulate the volume of air being diffused.
Claim 3
Dependent Claim
31 words
A system as described in claim 1 wherein said thermostatic means comprises a single thermostat in said one zone connected to control said pressure-reduction means and diffuser means for that zone.
Claim 4
Dependent Claim
97 words
A system as described in claim 1 wherein said diffuser means in one zone comprises a plurality of diffusers, and wherein said thermostatic means for that zone comprises a plurality of separately operable thermostats connected respectively to control said diffusers whereby each diffuser discharges a volume of air which is varied in accordance with the temperature sensed by its thermostat, and wherein said thermostatic means for that zone includes selector means to transmit to said pressure-reduction means for that zone control functions from the thermostat for the diffuser requiring the delivery of the maximum volume of air.
Claim 5
Dependent Claim
90 words
A system as described in claim 1 wherein said pressure-reduction means includes means to reduce the air flow passageway therethrough and said diffuser means reduces the volume of air by reducing the air flow passageway therethrough, and wherein said thermostatic means acts in response to a progressing demand for a reduction in air flow to continue the reduction in the air flow passageway of said diffuser means with an unchanged air flow passageway through said pressure reduction means when the volume of air being diffused is below a predetermined value.
Claim 6
Dependent Claim
100 words
In a method for controlling an air conditioning system having a central supply for conditioned air which is distributed through a duct system at elevated pressure to a plurality of zones and is delivered to each zone through a reduced pressure duct at a reduced pressure and is then discharged into the zone, the steps of, controlling the flow of air into the reduced pressure duct for one zone in accordance with the temperature in that zone, and controlling the volume of air discharged from said reduced pressure duct in accordance with the temperature of the air in that zone.
Claim 7
Dependent Claim
100 words
In a method for controlling an air conditioning system having a central supply for conditioned air which is distributed through a duct system at elevated pressure to a plurality of zones and is delivered to each zone through a reduced pressure duct at a reduced pressure and is then discharged into the zone, the steps of, controlling the flow of air into the reduced pressure duct for one zone in accordance with the temperature in that zone, and controlling the volume of air discharged from said reduced pressure duct in accordance with the temperature of the air in that zone.
Claim 8
Dependent Claim
46 words
The method as described in claim 5 wherein The volume of air flowing into said reduced pressure duct is varied in accordance with a pattern which is different from that of the variations in the rate at which air is discharged from that reduced pressure duct.
Claim 9
Dependent Claim
66 words
The method as described in claim 5 wherein the air is discharged through a plurality of diffusers each of which has a thermostat control responsive to the temperature of the air in that zone, and wherein the control of the flow of air in the said reduced pressure duct is exerted as a function of the control of the diffuser requiring the maximum volume of air.
References Cited (Backward Citations)
US2188775A
Cited
US2316237A
Cited
US2923222A
Cited
US3154247A
Cited
US3117723A
Cited
US3687364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |