This disclosure relates in general to control systems and more particularly to an autonomous ventilation system.
Ventilation systems are commonly found in modern residential, restaurant, and commercial kitchens. Heat, smoke, and fumes are an ordinary byproduct of cooking many foods and must be removed in order to protect the health and comfort of those present in the kitchen and adjacent areas. Ventilation systems provide an effective way to capture excessive heat, smoke, and fumes generated in kitchens and ventilate them to the atmosphere where they pose no threat to health or safety.
A typical ventilation system consists of an exhaust hood positioned over pieces of cooking equipment that are known to produce heat, smoke, or fumes. This exhaust hood is usually connected via ducts to an exhaust fan and in turn to a vent located on the outside of the building housing the kitchen. The exhaust fan is operated in a way to create a flow of air from the exhaust hood to the outside vent. This creates a suction effect at the exhaust hood that captures the air and any airborne contaminants around the hood. Consequently, any heat, smoke, or fumes generated by the cooking equipment will rise up to the overhead exhaust hood where it will be captured by the suction and transported out of the kitchen to the outside vent. There, it will dissipate harmlessly into the atmosphere.
Most ventilation systems must be manually activated and deactivated by the user. In a typical fast-food restaurant, for example, an employee must manually activate the kitchen ventilation system early in the day or before any cooking occurs. The system will then remain active in order to capture any smoke or fumes that may result from cooking. The system must then be manually deactivated periodically, at the end of the day, or after all cooking has ceased. This manual operation of the ventilation system typically results in the system being active at times when ventilation is not actually required. This needlessly wastes energy not only associated with the operation of the ventilation system, but also due to the ventilation of uncontaminated air supplied to the kitchen by a heating and cooling system. By operating when no smoke or fumes are present, the ventilation system will remove other valuable air that was supplied to heat or cool the kitchen and thus cause the heating and cooling system to operate longer than it would have otherwise.
The present disclosure provides an autonomous ventilation system that substantially eliminates or reduces at least some of the disadvantages and problems associated with previous methods and systems.
According to one embodiment, an autonomous ventilation system includes a variable-speed exhaust fan, a controller, an exhaust hood, and a spillage sensor. The exhaust fan removes air contaminants from an area. The controller is coupled to the exhaust fan and adjusts the speed of the exhaust fan. The exhaust hood is coupled to the exhaust fan and directs air contaminants to the exhaust fan. The spillage sensor is coupled to the controller, detects changes in an environmental parameter in a spillage zone adjacent to the exhaust hood, and communicates information relating to detected changes in the environmental parameter to the controller. The controller adjusts the speed of the exhaust fan in response to information relating to changes in the environmental parameter detected by the spillage sensor.
Technical advantages of certain embodiments may include a reduction in energy consumption, an increase in the comfort of the ventilated area, a decrease in noise, and an increase in the lifespan of environmental sensors and fans. Embodiments may eliminate certain inefficiencies such as needlessly ventilating valuable air from an area that was supplied by a heating, ventilation, and air conditioning (“HVAC”) system.
Other technical advantages will be readily apparent to one skilled in the art from the following figures, descriptions, and claims. Moreover, while specific advantages have been enumerated above, various embodiments may include all, some, or none of the enumerated advantages.
For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
Removing air contaminants 122 from kitchen 102 helps ensure that kitchen 102, as well as adjacent room 104, remains safe, sufficiently free of air contaminants 122, and at a comfortable temperature for anyone inside. The volume of air exhausted via exhaust hood 116 should be carefully regulated to minimize the quantity of conditioned air (air entering facility 100 through HVAC system 110) that is vacated from kitchen 102 and facility 100 while ensuring that enough air is ventilated to prevent buildup of air contaminants 122. Because a particular piece of cooking equipment 114 may not be in use at all times and thus will not continuously generate air contaminants 122, it becomes beneficial to vary the rate at which exhaust hood 116 ventilates air contaminants 122 from kitchen 102 as well as the rate at which ceiling supply air vent 118 supplies air to kitchen 102 as a means to conserve energy and increase occupant safety and comfort. The embodiments discussed below provide a convenient alternative to manually activating a ventilation system as the level of air contaminants fluctuates.
While facility 100 has been described in reference to a restaurant, it should be noted that there are many facilities in need of such ventilation systems. Such facilities include manufacturing facilities, industrial facilities, residential kitchens, and the like. Likewise, embodiments in this disclosure are described in reference to kitchen 102, but could be utilized in any facility requiring ventilation.
Autonomous ventilation system 200 also includes a spillage probe assembly 214 containing one or more spillage sensors 230 (not pictured in
Spillage probe assembly 214 also contains a termination box 224, and in some embodiments, an override button 226. The one or more spillage sensors 230 are coupled to termination box 224. In some embodiments, override button 226 is also coupled to termination box 224. Override button 226, however, may be located on spillage probe assembly 214, exhaust hood 116, or any other location that is accessible to a user.
Autonomous ventilation system 200 is controlled by a controller 220. As an example only, controller 220 may consist of the Kontar MC8 process controller manufactured by Current Energy, Inc. However, any suitable controller may be used. Controller 220 is coupled to exhaust fan 210, supply air fan 212, cooking equipment 114, an exhaust temperature sensor (not pictured), an ambient kitchen temperature sensor 228, override button 226, and/or one or more spillage sensors 230. Controller 220 receives information from spillage sensors 230 to determine fluctuations in an environmental parameter(s) in spillage zone 216. Controller 220 also communicates with exhaust fan 210 to control its speed and consequently the rate of ventilation of autonomous ventilation system 200. In some embodiments, controller 220 additionally communicates with supply air fan 212 to control its speed and thus the amount of air that is re-supplied to kitchen 102. Controller 220 may also be coupled to cooking equipment 114 in order to determine when it has been turned on and off.
In operation, autonomous ventilation system 200 automatically starts and stops according to a predetermined schedule and/or by sensing the activation of cooking equipment 114 under exhaust hood 116. In addition, the ventilation rate of autonomous ventilation system 200 automatically adjusts according to fluctuations in one or more environmental parameters in spillage zone 216 as sensed by spillage sensors 230. Additionally or alternatively, a user may manually control autonomous ventilation system 200 by momentarily pressing override button 226.
First, autonomous ventilation system 200 may automatically start and stop according to a predetermined schedule. A user may configure a schedule or modify an existing schedule through a local or remote interface to controller 220. Controller 220, in turn, may turn exhaust fan 210 on and off and/or adjust its speed based on this predetermined schedule. Additionally or alternatively, controller 220 may turn exhaust fan 210 on and off and/or adjust its speed based on the state of cooking equipment 114 under exhaust hood 116. In one embodiment, for example, controller 220 may be coupled to cooking equipment 114 in order to detect when it has been activated. In such an embodiment, controller 220 may turn on exhaust fan 210 when cooking equipment 114 has been activated, and may turn off exhaust fan 210 when cooking equipment 114 has been deactivated. By automatically starting and stopping according to a predetermined schedule and/or the state of cooking equipment 114, autonomous ventilation system 200 provides increased energy efficiency and comfort level while minimizing unnecessary noise and ventilation of conditioned air.
Additionally, controller 220 may turn exhaust fan 210 on and off and/or adjust its speed based on fluctuations in an environmental parameter in spillage zone 216 due to spillage air contaminants. In one embodiment, for example, spillage probe assembly 214 contains one or more spillage sensors 230 that measure the temperature of spillage zone 216. As an example only, spillage sensors 230 may consist of the Betatherm G10K3976AIG1 thermistor. In this embodiment, controller 220 may communicate with an ambient kitchen temperature sensor 228 to determine the ambient temperature of kitchen 102 away from the spillage zone (e.g., receive temperature measurements from sensors) and with spillage sensors 230 of spillage probe assembly 214 to determine the temperature of spillage zone 216. Controller 220 may then compare the temperature of spillage zone 216 with that of kitchen 102 to determine if the difference in temperature has reached or exceeded a predetermined amount, for example, two degrees Fahrenheit. If, for example, the temperature of spillage zone 216 exceeds the temperature of kitchen 102 by this predetermined amount (or any other suitable amount), controller 220 may accelerate the speed of exhaust fan 210 to increase the ventilation rate of autonomous ventilation system 200 and eliminate spillage air contaminants. Controller 220 may maintain this increased ventilation rate for a predetermined period of time or until it is determined that the increased rate is no longer needed. For example, controller 220 may decrease the speed or deactivate exhaust fan 210 when the difference in temperature between kitchen 102 and spillage zone 216 returns to a value that is less than the predetermined amount. By automatically adjusting its ventilation rate based on environmental parameters in spillage zone 216, autonomous ventilation system 200 alleviates disadvantages of other ventilation systems such as wasted energy and unnecessary noise. In addition, by locating spillage sensors 230 in spillage zone 216 outside of exhaust hood 116, the sensors are less susceptible to normal deterioration and corrosion caused by air contaminants 122. As a result, spillage sensors 230 require less cleaning and maintenance and will have a longer life.
In another embodiment, spillage probe assembly 214 may contain one or more spillage sensors 230 that measure bidirectional airflow through spillage zone 216. In this embodiment, spillage sensors 230 are orientated in such a way as to detect air flow in the up and down directions through spillage zone 216. If the ventilation rate of autonomous ventilation system 200 is insufficient to capture and remove all air contaminants 122 associated with the operation of cooking equipment 114, spillage air contaminants will spill out of exhaust hood 116 and pass through spillage zone 216 creating an upward flow of air. Controller 220 may detect this upward flow of air by receiving airflow measurements from spillage sensors 230. If the flow of air up through spillage zone 216 reaches or exceeds a predetermined amount, controller 220 may accelerate the speed of exhaust fan 210 to increase the ventilation rate of autonomous ventilation system 200 and eliminate or reduce spillage air contaminants. Controller 220 may then decrease the ventilation rate after a predetermined period of time or after it detects with spillage sensors 230 that there is no longer a flow of air up through spillage zone 216 equal to or greater than the predetermined amount.
In some embodiments, controller 220 may additionally or alternatively adjust the speed of exhaust fan 210 based on the state of override button 226. In this embodiment, a user may momentarily push override button 226 in order to manually control the speed of exhaust fan 210 and thus the ventilation rate of autonomous ventilation system 200. For example, if exhaust fan 210 is not on, a user may press override button 226 in order to activate autonomous ventilation system 200 for a predetermined amount of time. If exhaust fan 210 is already on, a user may press override button 226 in order to accelerate the ventilation rate of autonomous ventilation system 200 for a predetermined amount of time. In some embodiments, there may be more than one override button 226. In these embodiments, override buttons 226 may provide the user a means to turn autonomous ventilation system 200 on and/or off, increase and/or decrease the ventilation rate, or any combination of the proceeding. The one or more override buttons 226 provide the user with a means of manual control over autonomous ventilation system 200 when desired.
In some embodiments, controller 220 may also automatically control the speed of supply air fan 212 to provide a desired pressurization of kitchen 102. For example, it may set the speed of supply air fan 212 to match the speed of exhaust fan 210. As a result, the rate at which air is removed and supplied to kitchen 102 is approximately equal and thus the temperature and air pressure remains relatively constant. Controller 220 may also set the speed of supply air fan 212 to a speed that is greater than the speed of exhaust fan 210 to create positive pressure in kitchen 102. Additionally or alternatively, controller 220 may set the speed of supply air fan 212 to a speed that is less than the speed of exhaust fan 210 to create negative pressure in kitchen 102. This ensures that the environment in kitchen 102 remains safe and comfortable regardless of how much air is being ventilated through exhaust hood 116.
Exhaust fan 210 and supply air fan 212 may be powered by various types of motors including, but not limited to, AC single-phase electrical motors, AC three-phase electrical motors, and DC electrical motors. The speeds of exhaust fan 210 and supply air fan 212 may be adjusted by controller 220 by modulating the frequency of the output of a variable frequency drive in the case of AC single-phase or three-phase electrical motors, by a phase cut modulation technique in the case of a single-phase motor, or by changing voltage in case of a DC electrical motor.
Modifications, additions, or omissions may be made to autonomous ventilation system 200 and the described components. As an example, while
Spillage probe assembly 300 includes a housing 302, a tensioned cable 304, one or more spillage sensors 230, a termination box 224, and an override button 226. The one or more spillage sensors 230 and override button 226 are coupled to termination box 224, which may in turn be coupled to controller 220 (not pictured). Tensioned cable 304 is coupled to housing 302 and provides support to spillage sensors 230. Tensioned cable 304 suspends spillage sensors 230 in spillage zone 216 and isolates them from housing 302. Spillage sensors 230 are attached to tensioned cable 304 in such a way that allows a user to slide the sensors on tensioned cable 304 to a location that is above a piece of equipment such as cooking equipment 114 below exhaust hood 116. Tensioned cable 304 may be any material including, but not limited to, metal and/or plastic. In some embodiments, tensioned cable 304 may be replaced with any other suitable means of supporting spillage sensors 230 and isolating them from housing 302.
In operation, spillage probe assembly 300 is mounted to exhaust hood 116 in a manner that allows spillage sensors 230 to monitor spillage zone 216. Spillage probe assembly 300 is mounted to exhaust hood 116 with fasteners via mounting holes 306. Once mounted in the appropriate position above a piece of equipment such as cooking equipment 114, a user may manually adjust the position of one or more spillage sensors 230 by sliding them along tensioned cable 304 so that they are located over the piece of equipment to be monitored. Once in the desired position, spillage sensors 230 communicate information relating to detected changes in environmental parameters in spillage zone 216 to controller 220. For example, if the ventilation rate of autonomous ventilation system 200 is insufficient to capture and remove all air contaminants 122 associated with the operation of cooking equipment 114, spillage air contaminants will spill out of exhaust hood 116 and pass through spillage zone 216. Spillage sensors 230 may detect spillage air contaminants in a manner as described above in reference to
Modifications, additions, or omissions may be made to spillage probe assembly 300 and the described components. As an example, spillage probe assembly 300 as seen in
With reference now to
Autonomous ventilation control method 400 comprises three main states: OFF, LOW, and HIGH. In OFF state 402, controller 220 turns off exhaust fan 210 where it is not ventilating air from kitchen 102 via exhaust hood 116. In LOW state 410, controller 220 sets the speed of exhaust fan 210 to a minimal speed, Qmin, as will be described in more detail below. In HIGH state 422, controller 220 sets the speed of exhaust fan 210 to a maximum speed, Qmax.
Autonomous ventilation control method 400 begins in OFF state 402. While in OFF state 402, exhaust fan 210 is turned off. However, autonomous ventilation control method 400 will transition to LOW state 410, where the speed of exhaust fan 210 is set to minimum speed Qmin, if various events occur. Such events may include event 404 where a user presses override button 226, event 405 where a scheduled start time arrives, event 406 where cooking equipment 114 is turned on, or event 408 where an environmental parameter in spillage zone 216 meets or exceeds a predetermined threshold. Conversely, autonomous ventilation control method 400 will transition from LOW state 410 to OFF state 402 if other events occur. These events include event 412 where cooking equipment 114 is turned off, event 414 where a scheduled stop time arrives, event 416 where a period of time elapses after a user pushes override button 226, and/or event 417 where when the environmental parameter in spillage zone 216 returns to normal.
In event 404, a user pushes override button 226 while autonomous ventilation control method 400 is in OFF state 402 and exhaust fan 210 is off. Override button 226 is provided to give the user manual control of autonomous ventilation system 200. When the user presses override button 226 while exhaust fan 210 is off, autonomous ventilation control method 400 will transition to LOW state 410 in order to turn on exhaust fan 210 and ventilate the area. In some embodiments, a timer is started when the user pushes override button 226 in event 404. In event 416, this override button timer expires according to a predetermined, but configurable, amount of time and autonomous ventilation control method 400 transitions from LOW state 410 back to OFF state 402. By monitoring the activity of override button 226, autonomous ventilation control method 400 provides the user a manual means by which to control autonomous ventilation system 200.
In event 405, a predetermined scheduled start time arrives. A user may interface with controller 220 to establish scheduled times for autonomous ventilation system 200 to turn on. Predetermined start times may also be preprogrammed into autonomous ventilation system 200. When a scheduled start time arrives in event 405, autonomous ventilation control method 400 will transition from OFF state 402 to LOW state 410 in order to turn on exhaust fan 210 and set its speed to Qmin. Conversely, a user may interface with controller 220 to establish scheduled times for autonomous ventilation system 200 to turn off, and/or stop times may be preprogrammed into autonomous ventilation system 200. In event 414, a scheduled stop time arrives while autonomous ventilation control method 400 is in LOW state 410. If event 414 occurs, autonomous ventilation control method 400 will transition to OFF state 402 where exhaust fan 210 is set to off.
In event 406, cooking equipment 114 below exhaust hood 116 is turned on while autonomous ventilation control method 400 is in OFF state 402 and exhaust fan 210 is off. If autonomous ventilation control method 400 determines that cooking equipment 114 has been turned on but exhaust fan 210 is off, it will transition to LOW state 410 and set the speed of exhaust fan 210 to Qmin. Conversely, event 412 occurs when cooking equipment 114 below exhaust hood 116 is turned off while autonomous ventilation control method 400 is in LOW state 410. If autonomous ventilation control method 400 determines that event 412 has occurred, it will transition from LOW state 410 to OFF state 402 and turn off exhaust fan 210.
In event 408, an environmental parameter in spillage zone 216 meets or exceeds a predetermined threshold while autonomous ventilation control method 400 is in OFF state 402. Autonomous ventilation control method 400 may determine by communicating with one or more spillage sensors 230 that an environmental parameter in spillage zone 216 has changed sufficiently to warrant the activation of exhaust fan 210. Such environmental parameters may include temperature and airflow as previously described in reference to
Autonomous ventilation control method 400 also includes HIGH state 422. While in HIGH state 422, exhaust fan 210 is set to its maximum speed, Qmax. Autonomous ventilation control method 400 will transition to HIGH state 422 from LOW state 410 when various events occur. Such events include event 418 where a user presses override button 226, and event 420 where an environmental parameter in spillage zone 216 meets or exceeds a predetermined threshold. Conversely, autonomous ventilation control method 400 will transition from HIGH state 422 to LOW state 410 and set the speed of exhaust fan 210 to Qmin if other events occur. Such events include event 424 where a period of time elapses after an environmental parameter in spillage zone exceeds a threshold, event 426 where an environmental parameter in spillage zone returns to normal, and/or a period of time elapses after a user pushes override button 226 in event 428. Similarly, autonomous ventilation control method 400 will transition from HIGH state 422 to OFF state 410 if a scheduled stop time arrives in event 430.
In event 418, a user pushes override button 226 while autonomous ventilation control method 400 is in LOW state 410 and exhaust fan 210 is set to Qmin. When a user presses override button 226 while exhaust fan 210 is already set to Qmin, autonomous ventilation control method 400 will transition to HIGH state 422 in order to set exhaust fan 210 to its maximum rate Qmax and ventilate the area. In some embodiments, a timer is started when the user pushes override button 226 in event 418. In event 428, this override button timer expires according to a predetermined, but configurable, amount of time and autonomous ventilation control method 400 transitions from HIGH state 410 back to LOW state 410. By monitoring the activity of override button 226, autonomous ventilation control method 400 provides the user a manual means by which to control autonomous ventilation system 200.
In event 420, an environmental parameter in spillage zone 216 meets or exceeds a predetermined threshold while autonomous ventilation control method 400 is in LOW state 410. If, for example, spillage sensors 230 are comprised of temperature sensors, event 420 will occur when autonomous ventilation control method 400 determines that the temperature of spillage zone 216 exceeds that of kitchen 102 by a predetermined amount. If autonomous ventilation control method 400 determines that this event has occurred while it is in LOW state 410, it will transition to HIGH state 422 and set the speed of exhaust fan 210 to Qmax. In some embodiments, this transition from Qmin to Qmax may be instantaneous. In other embodiments, however, the transition may be gradual and/or stair-stepped and may not actually reach Qmax if conditions in spillage zone 216 return to normal during the transition.
Conversely, event 426 occurs when autonomous ventilation control method 400 is in HIGH state 422 and the environmental parameter in spillage zone 216 returns to normal. If autonomous ventilation control method 400 determines that event 426 has occurred, it will transition back to LOW state 410 and set the speed of exhaust fan 210 to Qmin. In some embodiments, autonomous ventilation control method 400 may set a timer after an environmental parameter in spillage zone 216 meets or exceeds a predetermined threshold in event 420. In event 424, this spillage timer expires according to a predetermined, but configurable, amount of time. If autonomous ventilation control method 400 determines that this timer has expired in event 424, it may then transition from HIGH state 422 back to LOW state 410 and set the speed of exhaust fan 210 back to Qmin.
In event 430, a predetermined scheduled stop time arrives in a similar manner as event 414. When a scheduled stop time arrives in event 430, ventilation control method 400 will transition from HIGH state 422 to OFF state 402 in order to turn off exhaust fan 210.
The minimal speed, Qmin, for exhaust fan 210 may be determined by various methods. Initially, Qmin may be preprogrammed to be the lowest capable speed of exhaust fan 210, or it may be a speed that is calculated to provide the minimal amount of ventilation as required by applicable standards. However, Qmin may be automatically adjusted by autonomous ventilation control method 400. For example, if the temperature of spillage zone 216 exceeds that of kitchen 102 by a predetermined amount in event 420, autonomous ventilation control method 400 may gradually increase the speed of exhaust fan 210 from Qmin. It may continually monitor the temperature of spillage zone 216 while it is increasing the speed to determine the speed at which the difference in temperature drops to an acceptable level. It may then record this speed as the new Qmin and use it whenever it is in LOW state 410. In addition or alternatively, a user may initiate a recalibration of Qmin through a local or remote interface while all cooking equipment 114 under exhaust hood 116 is idle. In this procedure, autonomous ventilation control method 400 gradually decreases the speed of exhaust fan 210 from Qmax until the temperature in spillage zone 216 begins to rise. It may then record the speed of exhaust fan 210 at the point the temperature started rising and use it as the new Qmin.
The speed Qmax of exhaust fan 210 is the maximum operating speed of the fan. This speed may be predetermined and/or preset by the manufacturer. In some embodiments, Qmax may be controlled/set by a user through a local or remote interface.
While a particular autonomous ventilation control method 400 has been described, it should be noted that certain steps may be rearranged, modified, or eliminated where appropriate. Additionally, while certain embodiments have been described in detail, numerous changes, substitutions, variations, alterations and modifications may be ascertained by those skilled in the art, and it is intended that the present disclosure encompass all such changes, substitutions, variations, alterations and modifications as falling within the spirit and scope of the appended claims.
This application is a continuation of U.S. application Ser. No. 13/182,304, filed Jul. 13, 2011, which is a continuation of U.S. application Ser. No. 12/050,473, filed Mar. 18, 2008, which claims the benefit of U.S. Provisional Application No. 60/915,974, filed May 4, 2007, each of which is hereby incorporated by reference herein in their entireties.
Number | Name | Date | Kind |
---|---|---|---|
2743529 | Hayes | May 1956 | A |
2833615 | Kollgaard | May 1958 | A |
2853367 | Karol | Sep 1958 | A |
2862095 | Scofield | Nov 1958 | A |
2933080 | Adey | Apr 1960 | A |
3045705 | Hausammann | Jul 1962 | A |
3323439 | Waever et al. | Jun 1967 | A |
3332676 | Namy | Jul 1967 | A |
3381134 | Wolf | Apr 1968 | A |
3400649 | Jensen | Sep 1968 | A |
3457850 | Sweet et al. | Jul 1969 | A |
3513766 | Alhrich | May 1970 | A |
3536457 | Henderson | Oct 1970 | A |
3612106 | Camboulives et al. | Oct 1971 | A |
3690245 | Ferlise et al. | Sep 1972 | A |
3752056 | Chamberlin et al. | Aug 1973 | A |
3809480 | Somerville et al. | May 1974 | A |
3825346 | Rizzo | Jul 1974 | A |
3829285 | Beck | Aug 1974 | A |
3866055 | Pike | Feb 1975 | A |
3895569 | Miller | Jul 1975 | A |
3943836 | Kuechler | Mar 1976 | A |
3952640 | Kuechler | Apr 1976 | A |
3978777 | Nett | Sep 1976 | A |
4043319 | Jensen | Aug 1977 | A |
4047519 | Nett | Sep 1977 | A |
4050368 | Eakes | Sep 1977 | A |
4056877 | Kuechler | Nov 1977 | A |
4085736 | Kuechler | Apr 1978 | A |
4105015 | Isom | Aug 1978 | A |
4109641 | Hunzicker | Aug 1978 | A |
4113439 | Ookubo | Sep 1978 | A |
4117833 | Mueller | Oct 1978 | A |
4127106 | Jensen | Nov 1978 | A |
4134394 | Otenbaker | Jan 1979 | A |
4138220 | Davies | Feb 1979 | A |
4146017 | Overton | Mar 1979 | A |
4147502 | Milton | Apr 1979 | A |
4153044 | Nett | May 1979 | A |
4155348 | Ahlrich | May 1979 | A |
4160407 | Duym | Jul 1979 | A |
4174065 | Knauth | Nov 1979 | A |
4211154 | Eakes | Jul 1980 | A |
4213947 | Fremont | Jul 1980 | A |
4285390 | Fortune et al. | Aug 1981 | A |
4286572 | Searcy | Sep 1981 | A |
4287405 | Ohmae et al. | Sep 1981 | A |
4346692 | Mccauley | Aug 1982 | A |
4350166 | Mobarry | Sep 1982 | A |
4373507 | Schwartz | Feb 1983 | A |
4386733 | Bradshaw | Jun 1983 | A |
4398415 | Jacocks et al. | Aug 1983 | A |
4467782 | Russel | Aug 1984 | A |
4475534 | Moriarty | Oct 1984 | A |
4483316 | Fritz | Nov 1984 | A |
4484563 | Fritz et al. | Nov 1984 | A |
4497242 | Moyer | Feb 1985 | A |
4556046 | Riffel | Dec 1985 | A |
4584929 | Jarmyer et al. | Apr 1986 | A |
4586486 | Kaufman | May 1986 | A |
4617909 | Molitor | Oct 1986 | A |
4655194 | Wooden | Apr 1987 | A |
4706553 | Sharp et al. | Nov 1987 | A |
4733311 | Sharp | Mar 1988 | A |
4781460 | Bott | Nov 1988 | A |
4788905 | Von Kohorn | Dec 1988 | A |
4811724 | Aalto | Mar 1989 | A |
4856419 | Imai | Aug 1989 | A |
4867106 | Staats | Sep 1989 | A |
4872892 | Vartiainen et al. | Oct 1989 | A |
4903685 | Melink | Feb 1990 | A |
4903894 | Pellinen et al. | Feb 1990 | A |
4921509 | Maclin | May 1990 | A |
4934256 | Moss et al. | Jun 1990 | A |
4944283 | Tsuchiya | Jul 1990 | A |
4944285 | Glassman | Jul 1990 | A |
5042453 | Shellenberger | Aug 1991 | A |
5042456 | Cote | Aug 1991 | A |
5050581 | Rohl-Hager et al. | Sep 1991 | A |
5063834 | Aalto | Nov 1991 | A |
5090303 | Ahmed | Feb 1992 | A |
5092227 | Ahmed et al. | Mar 1992 | A |
5115728 | Ahmed et al. | May 1992 | A |
5139009 | Walsh | Aug 1992 | A |
5146284 | Tabarelli et al. | Sep 1992 | A |
5205783 | Dieckert et al. | Apr 1993 | A |
5215075 | Caridis | Jun 1993 | A |
5215497 | Drees | Jun 1993 | A |
5220910 | Aalto | Jun 1993 | A |
5240455 | Sharp | Aug 1993 | A |
5251608 | Cote | Oct 1993 | A |
5268739 | Martinelli et al. | Dec 1993 | A |
5311930 | Bruenn | May 1994 | A |
5312296 | Aalto | May 1994 | A |
5312297 | Dieckert et al. | May 1994 | A |
5394861 | Stegmaier | Mar 1995 | A |
5406073 | Sharp et al. | Apr 1995 | A |
5414509 | Veligdan | May 1995 | A |
5415583 | Brandt, Jr. | May 1995 | A |
5518446 | Jacob | May 1996 | A |
5522377 | Fritz | Jun 1996 | A |
5558821 | Konig | Sep 1996 | A |
5580535 | Hoke | Dec 1996 | A |
5597354 | Janu et al. | Jan 1997 | A |
5622100 | King | Apr 1997 | A |
5657744 | Vianen | Aug 1997 | A |
5713346 | Kuechler | Feb 1998 | A |
5716268 | Strongin | Feb 1998 | A |
5718219 | Boudreault | Feb 1998 | A |
5720274 | Brunner et al. | Feb 1998 | A |
5764579 | McMasters et al. | Jun 1998 | A |
5779538 | Jardinier | Jul 1998 | A |
5874292 | McMinn, Jr. | Feb 1999 | A |
5882254 | Jacob | Mar 1999 | A |
5960786 | Lambertson | Oct 1999 | A |
5992152 | Weres et al. | Nov 1999 | A |
6044838 | Deng | Apr 2000 | A |
6058929 | Fritz | May 2000 | A |
6089970 | Feustel | Jul 2000 | A |
6154686 | Hefferen et al. | Nov 2000 | A |
6170480 | Melink et al. | Jan 2001 | B1 |
6171480 | Lee et al. | Jan 2001 | B1 |
6173710 | Gibson et al. | Jan 2001 | B1 |
6179763 | Phillips, III | Jan 2001 | B1 |
6252689 | Sharp | Jun 2001 | B1 |
6336451 | Rohl-Hager et al. | Jan 2002 | B1 |
6347626 | Yi | Feb 2002 | B1 |
6351999 | Maul et al. | Mar 2002 | B1 |
6428408 | Bell et al. | Aug 2002 | B1 |
6450879 | Suen | Sep 2002 | B1 |
6515283 | Castleman et al. | Feb 2003 | B1 |
6549554 | Shiojima et al. | Apr 2003 | B2 |
6645066 | Gutta et al. | Nov 2003 | B2 |
6669547 | Liu | Dec 2003 | B2 |
6752144 | Lee | Jun 2004 | B1 |
6782294 | Reich et al. | Aug 2004 | B2 |
6846236 | Gregoricka | Jan 2005 | B2 |
6851421 | Livchak et al. | Feb 2005 | B2 |
6869468 | Gibson | Mar 2005 | B2 |
6878195 | Gibson | Apr 2005 | B2 |
6890252 | Liu | May 2005 | B2 |
6899095 | Livchak | May 2005 | B2 |
6916239 | Siddaramanna et al. | Jul 2005 | B2 |
6920874 | Siegel | Jul 2005 | B1 |
6974380 | Cui et al. | Dec 2005 | B2 |
7048199 | Melink | May 2006 | B2 |
7088397 | Hunter et al. | Aug 2006 | B1 |
7147168 | Bagwell et al. | Dec 2006 | B1 |
7258280 | Wolfson | Aug 2007 | B2 |
7318771 | Huang | Jan 2008 | B2 |
7364094 | Bagwell et al. | Apr 2008 | B2 |
7442119 | Fluhrer | Oct 2008 | B2 |
7609290 | McEwan | Oct 2009 | B2 |
7699051 | Gagas et al. | Apr 2010 | B2 |
7728845 | Holub | Jun 2010 | B2 |
7866312 | Erdmann | Jan 2011 | B2 |
8038515 | Livchak et al. | Oct 2011 | B2 |
20030104778 | Liu | Jun 2003 | A1 |
20030146082 | Gibson et al. | Aug 2003 | A1 |
20030207662 | Liu | Nov 2003 | A1 |
20030210340 | Frederick Romanowich | Nov 2003 | A1 |
20030216837 | Reich et al. | Nov 2003 | A1 |
20040011349 | Livchak et al. | Jan 2004 | A1 |
20050115557 | Meredith | Jun 2005 | A1 |
20050229922 | Magner et al. | Oct 2005 | A1 |
20050279845 | Bagwell et al. | Dec 2005 | A1 |
20060009147 | Huang et al. | Jan 2006 | A1 |
20060032492 | Bagwell et al. | Feb 2006 | A1 |
20060060187 | Luddy et al. | Mar 2006 | A1 |
20060219235 | Bagwell et al. | Oct 2006 | A1 |
20060278216 | Gagas et al. | Dec 2006 | A1 |
20070015449 | Livchak et al. | Jan 2007 | A1 |
20070023349 | Kyllonen et al. | Feb 2007 | A1 |
20070068509 | Bagwell et al. | Mar 2007 | A1 |
20070165353 | Fleischer | Jul 2007 | A1 |
20070183154 | Robson | Aug 2007 | A1 |
20070184771 | Fluhrer | Aug 2007 | A1 |
20070202791 | Lee | Aug 2007 | A1 |
20070207420 | Zimmermann et al. | Sep 2007 | A1 |
20070272230 | Meredith et al. | Nov 2007 | A9 |
20080045132 | Livchak et al. | Feb 2008 | A1 |
20080141996 | Erdmann | Jun 2008 | A1 |
20080207109 | Bagwell | Aug 2008 | A1 |
20080297808 | Riza et al. | Dec 2008 | A1 |
20080302247 | Magner | Dec 2008 | A1 |
20080308088 | Livchak | Dec 2008 | A1 |
20090032011 | Livchak et al. | Feb 2009 | A1 |
20090093210 | Livchak | Apr 2009 | A1 |
20090199844 | Meredith | Aug 2009 | A1 |
20100051011 | Shaffer | Mar 2010 | A1 |
20110275301 | Burdett et al. | Nov 2011 | A1 |
Number | Date | Country |
---|---|---|
1138776 | Sep 1977 | AU |
3400697 | Jan 1998 | AU |
2933601 | Jul 2001 | AU |
838829 | Jun 1976 | BE |
1054430 | May 1979 | CA |
1069749 | Jan 1980 | CA |
1081030 | Jul 1980 | CA |
2536332 | Mar 2005 | CA |
682512 | Sep 1993 | CH |
314477 | Sep 1919 | DE |
2607301 | Sep 1976 | DE |
2659736 | Jul 1977 | DE |
3519189 | Dec 1986 | DE |
4120175 | Feb 1992 | DE |
4114329 | Nov 1992 | DE |
4203916 | Apr 1993 | DE |
19613513 | Oct 1997 | DE |
0314085 | May 1989 | EP |
0401583 | Dec 1990 | EP |
0541862 | May 1993 | EP |
0541863 | May 1993 | EP |
0623398 | Nov 1994 | EP |
0753706 | Jan 1997 | EP |
0881935 | Dec 1998 | EP |
1250556 | Oct 2002 | EP |
1637810 | Mar 2006 | EP |
1778418 | Feb 2007 | EP |
58971 | Jan 1981 | FI |
2008451 | Jan 1970 | FR |
2301778 | Sep 1976 | FR |
2705766 | Feb 1994 | FR |
1544445 | Apr 1979 | GB |
2054143 | Feb 1981 | GB |
2132335 | Jul 1984 | GB |
2266340 | Oct 1993 | GB |
1019417 | Feb 2000 | HK |
51-132645 | Nov 1976 | JP |
60-213753 | Oct 1985 | JP |
63-091442 | Apr 1988 | JP |
63183341 | Jul 1988 | JP |
63-251741 | Oct 1988 | JP |
10-084039 | Mar 1989 | JP |
02-033552 | Feb 1990 | JP |
32-047937 | Nov 1991 | JP |
40-000140 | Jan 1992 | JP |
40-062347 | Feb 1992 | JP |
40-068242 | Mar 1992 | JP |
41-013143 | Apr 1992 | JP |
52-048645 | Sep 1993 | JP |
10-288371 | Oct 1998 | JP |
H11-514734 | Dec 1999 | JP |
2000-081216 | Mar 2000 | JP |
2002-089859 | Mar 2002 | JP |
2003-519771 | Jun 2003 | JP |
2003-269770 | Sep 2003 | JP |
7601862 | Feb 1976 | NL |
7602168 | Aug 1976 | SE |
7904443 | Nov 1980 | SE |
WO 8606154 | Oct 1986 | WO |
WO 9117803 | Nov 1991 | WO |
WO 9208082 | May 1992 | WO |
WO 9748479 | Dec 1997 | WO |
WO 0151857 | Jul 2001 | WO |
WO 0183125 | Nov 2001 | WO |
WO 0184054 | Nov 2001 | WO |
WO 0214728 | Feb 2002 | WO |
WO 0214746 | Feb 2002 | WO |
WO 03056252 | Jul 2003 | WO |
WO 2005019736 | Mar 2005 | WO |
WO 2005114059 | Dec 2005 | WO |
WO 2006002190 | Jan 2006 | WO |
WO 2006012628 | Feb 2006 | WO |
WO 2006074420 | Jul 2006 | WO |
WO 2006074425 | Jul 2006 | WO |
WO 2007121461 | Oct 2007 | WO |
WO 2008157418 | Dec 2008 | WO |
WO 2009092077 | Jul 2009 | WO |
WO 2009129539 | Oct 2009 | WO |
Entry |
---|
Abstract for Gidaspow, D. “Multiphase Flow and Fluidization—Continuum and Kinetic Theory Descriptions”, Academic Press 1994. |
Abstract for Tennekes et al., “A First Course of Turbulence”, Mass. Inst. Tech., 1972. |
International Search Report and Written Opinion dated Jan. 5, 2007, for International Application No. PCT/US05/26378 filed Jul. 25, 2005. |
Morsi et al., “An Investigation of Particle Trajectories in Two-Phase Flow Systems”, Journal of Fluid Mechanics, 1972, 55: pp. 193-208. |
Non-Final Office Action, dated May 28, 2010, in U.S. Appl. No. 12/407,686. |
Prosecution history of U.S. Appl. No. 07/010,277, now U.S. Patent No. 4,811,724. |
Saravelou et al., “Detailed Modeling of a Swirling Coal Flame”, Combustion Science and Technology, 1997, 123: pp. 1-22. |
Skimm, G.K., Technician's Guide to HVAC, 1995, McGraw-Hill, pp. 322-330. |
Translation of foreign patent document DE 4203916. |
Number | Date | Country | |
---|---|---|---|
20140182575 A1 | Jul 2014 | US |
Number | Date | Country | |
---|---|---|---|
60915974 | May 2007 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 13182304 | Jul 2011 | US |
Child | 14198468 | US | |
Parent | 12050473 | Mar 2008 | US |
Child | 13182304 | US |