Patent US5339635A successfully refreshed from Google Patents.
US5180102A
Expired / Lapsed
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Temperature control system for zoned space
Assignee: Carrier Corp
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Filing: 1991-08-12
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Granted: 1993-01-19
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Expires: 2011-08-12
Abstract
Abstract A variable air volume control system has a temperature system management device which calculates an air flow setpoint in a temperature zone as a function of a proportional term that accommodates gross temperature-setpoint errors, and integral term that provides heating or cooling load matching, and a derivative term that accommodates rapid fluctuations in the cooling or heating load, and communicates the flow setpoint to a terminal control unit to adjust the air flow to a space. The terminal control unit will implement a flow setpoint as a function of the gross error in temperature in the space and a default temperature comfort setpoint upon failure of the temperature system management device to maintain a temperature in the zone.
Inventors
- 👤 Jeffrey S. Gilbert
- 👤 Brett A. Desmarais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:09
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
204 words
A temperature control system for controlling the flow of air into a plurality of temperature zones of a building, each temperature zone having at least one air terminal to adjustably maintain a variable volume of air into the associated temperature zone, comprising: a system management means generating a desired air flow setpoint schedule for the plurality of temperature zones, and a terminal control means for each temperature zone for receiving the generating desired air flow setpoint for varying the air through an associated air terminal to the desired air flow setpoint; wherein said desired air flow setpoint is calculated using the following formula: Flow Setpoint=G.sub.t ×(K.sub.p ×P+K.sub.i ×I+K.sub.d ×D) where: P=Temperature Setpoint-Zone Space Temperature, (for heating), or Zone Space Temeprature-Temperature Setpoint, (for cooling); ##EQU2## where R is the periodic running rate of this process; and I is sum of all I terms from I o to In n K i =0.06, in 1/° F. seconds; If I >100 (K i ×G t ), then I=100/(K i ×G t ), and If I <0, then I=O; D=(P-Previous P)/R, where R is the periodic running rate of this process; K d =1, in seconds/°F.; and G t =Temperature loop Gain Multiplier, having a range from 0.1-10.
Claim 2
Dependent Claim
204 words
A temperature control system for controlling the flow of air into a plurality of temperature zones of a building, each temperature zone having at least one air terminal to adjustably maintain a variable volume of air into the associated temperature zone, comprising: a system management means generating a desired air flow setpoint schedule for the plurality of temperature zones, and a terminal control means for each temperature zone for receiving the generating desired air flow setpoint for varying the air through an associated air terminal to the desired air flow setpoint; wherein said desired air flow setpoint is calculated using the following formula: Flow Setpoint=G.sub.t ×(K.sub.p ×P+K.sub.i ×I+K.sub.d ×D) where: P=Temperature Setpoint-Zone Space Temperature, (for heating), or Zone Space Temeprature-Temperature Setpoint, (for cooling); ##EQU2## where R is the periodic running rate of this process; and I is sum of all I terms from I o to In n K i =0.06, in 1/° F. seconds; If I >100 (K i ×G t ), then I=100/(K i ×G t ), and If I <0, then I=O; D=(P-Previous P)/R, where R is the periodic running rate of this process; K d =1, in seconds/°F.; and G t =Temperature loop Gain Multiplier, having a range from 0.1-10.
Claim 3
Dependent Claim
52 words
A temperature control system as setforth in claim 1 wherein if said terminal control means fails to receive said generated air flow setpoint after a predetermined period then said terminal control means will generate a default flow setpoint to vary the air through an associated air terminal to the default flow setpoint.
Claim 4
Dependent Claim
44 words
A temperature control system as setforth in claim 2 wherein said default flow setpoint is calculated using the following formula: Default setpoint=K.sub.p ×P, where P=desired temperature-Zone Space Temperature (for heating), or Zone Space Temperature-desired temperature (for cooling), and K p =8, in 1/° F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-19 | 1996-07-20 | 1997-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-19 | 2000-07-20 | 2001-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-19 | 2004-07-20 | 2005-01-19 | $7700.00 | Window Closed / Lapsed |