US Patent No: 7,770,806
Number of patents in Portfolio can not be more than 2000
Temperature control in variable-capacity HVAC system
Stats
-
Aug 10, 2010
Issued date -
Jun 19, 2007
filing date -
11/820,521
serial no -
In Force
status
Importance
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Abstract
Relatively constant temperatures are maintained in a space by varying the capacity of heating or cooling equipment. A proportional band is used to adjust capacity to compensate for changes in heating or cooling load, and the proportional band is adjusted to bring the actual temperature within the space closer to the set point temperature. Such an adjustment may be made by determining the difference between the present temperature and the set point temperature, and adjusting a floating temperature set point by a percentage (e.g., ten percent) of the difference. Such a process may be repeated, for example, at regular intervals, such as once per minute. As a result, the temperature within the space approaches (e.g., asymptotically) the set point temperature whether the heating or cooling load is high or low. Methods, systems, and apparatuses are contemplated, including HVAC units and controls, including for residential applications, including using variable-speed drives.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,211,332 Thermostat control | 12 | 1991 | |
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| 5,192,020 Intelligent setpoint changeover for a programmable thermostat | 15 | 1991 | |
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| 4,992,715 Torque control apparatus for rotating motor machine | 26 | 1988 | |
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| 4,743,815 Brushless permanent magnet motor system | 177 | 1987 | |
| 4,950,918 Isolated control circuit for alternating current switches | 18 | 1988 | |
| 5,197,667 HVAC low power usage circulation blower | 18 | 1991 | |
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| 5,005,365 Thermostat speed bar graph for variable speed temperature control system | 35 | 1988 | |
| 5,027,789 Fan control arrangement for a two stage furnace | 27 | 1990 | |
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| 4,811,897 Duct type air conditioning system | 38 | 1987 | |
| 4,795,088 Air conditioning system | 25 | 1987 | |
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| 4,495,450 Control device for brushless motor | 57 | 1983 | |
| 5,119,071 Method and apparatus for controlling induction motor for compressor | 23 | 1991 | |
| 5,299,432 Control device for air conditioner | 13 | 1992 | |
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| 5,276,630 Self configuring controller | 79 | 1990 | |
| 5,390,206 Wireless communication system for air distribution system | 120 | 1991 | |
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| 5,161,606 Interactive electronic thermostat with minimum and maximum temperature thermal limit switches | 67 | 1991 | |
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| 4,773,311 Make up air controller for use with fume hood systems | 26 | 1986 | |
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| 7,509,816 Air conditioner | 1 | 2006 | |
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| 4,902,952 Cooling apparatus | 14 | 1989 | |
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| 4,803,848 Cooling system | 15 | 1987 | |
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| 4,576,012 Evaporative cooler | 20 | 1984 | |
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| 4,682,473 Electronic control and method for increasing efficiency of heating and cooling systems | 17 | 1986 | |
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| 5,364,026 Ventilation fan control | 28 | 1991 | |
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| 4,669,040 Self-tuning controller | 33 | 1984 | |
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| 4,699,570 Vacuum pump system | 23 | 1986 | |
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| 4,467,998 High gain pneumatic switch | 5 | 1983 | |
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Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Feb 10, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Feb 10, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 10, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |