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Control fired furnace fuzzy gas thesis



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my essay writing coach - This thesis describes the development of an advanced heat treatment process control strategy for natural gas fired furnaces at Carpenter Technology, Corp. in Reading, PA. The primary goal of the project was to implement an improved annealing heat treatment „on-heat‟Author: Thomas C.P. Karnezos. Sep 01,  · A predictive fuzzy controller is designed and implemented for an industrial furnace. The furnace temperature is controlled so as to track the reference profiles accurately, and to reject the disturbances. A RLS on-line predictor is used to predict future values of the plant’s output. Jan 01,  · Keywords: Fuzzy control, fuzzy controller, reduction, multihearth furnace, multivariable systems 1. INTRODUCTION The process taking place in a multihearth roasting furnace is one of the more important stages of the ammonium carbonate technology for the extraction of nickel from lateritic ores, since the quantity of the obtained nickel sinter Author: Mercedes Ramírez-Mendoza, Pedro Albertos. one pot meth sythesis

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masters degree thesis outline - Introduction The purpose with this thesis was to evaluate the control of the temperature in an annealing furnace, both the existing control and possibly new control strategies. Two main goals were produced, the first one was to reduce how often the burners switch between on and off. The new fuzzy PID control system presented in this thesis is a combination of the models used in traditional temperature control system and Dual cross limiting temperature control system that took problems such as the slow response and overshoot of furnace temperature caused by the drastic change of the value of gas and the pressure in to pcworldcojp.somee.com: Jian Long Guan, An Rui He, Wen Quan Sun, Nan Feng Zhang, Jian Hua Li. The Harmonic Distortion Reduction of Phase-Angle Fired SCRs Feeding a Resistive Load using Fuzzy Logic Matthew A. Clark Fired SCRs Feeding a Resistive Load using Fuzzy Logic. A thesis submitted in partial fulfillment and the department of energy all use large SCR banks control resistive heating Cited by: 1. internet classroom vs traditional essay

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internet classroom vs traditional essay - Multi-Coal Fired Boiler Optimum Control Real-time Calculation Based on Fuzzy Logic. The state of heating surfaces can be estimated based on fuzzy logic. The effect of a coal type can be calculated with high precision in real time from the absorbed heat. Constructed from Software Logic. fired, thermal-oil heating plants by using a combination of carbon monoxide monitoring and oxygen trim control to automatically adjust the excess air setpoint. Heating plants require the correct amount of oxygen for combustion. Too little excess air does not allow complete combustion, producing a loss in efficiency and wasted fuel. Too. In a gas fired oven, radiant tubes are able to separate the furnace atmosphere from the products of combustion. The sealed box approach is quite economical because there is less maintenance required when compared to a retort furnace. In addition, the heating elements can be more evenly distributed and adding a fan is not a major issue. ap english language composition essay rubrics

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postgraduate coursework usyd - Apr 06,  · The energy efficiency of gas-burned boilers in space heating systems is sensitive to how the boiler is controlled. This study is aimed to investigate how the overall energy performance of a heating system can be optimized using best boiler control scheme. This is to be achieved through experimental studies and simulation studies. This paper presents the latter. The module considers a natural gas fired power plant, which in turn includes fuel input from high pressure network, infrastructure, emissions, and substances needed for operation. The module uses the average net efficiency of natural gas power plants [7]. Blast furnace gas, burned in . Oct 29,  · Turn the power switch of the furnace to “Off.” The gas supply can usually be found along the furnace bottom, on its control panel, or inside the access panel. Turn the gas supply to “Off” and wait at least five pcworldcojp.somee.com: 27K. protestant scholasticism essays in reassessment table of contents

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moral courage essay contest 2014 - Swapan Basu, Ajay Kumar Debnath, in Power Plant Instrumentation and Control Handbook, Flue Gas Recirculation Introduced into Furnace. When the take-off point for the gas recirculation system is at a lower pressure zone than the introduction point, gas recirculation fans are essential to force the part of return flue gas back to the comparatively higher-pressure furnace via the. Is the statement thesis prompts teach- er-student relation, in its place. The view is that it is important 5. Vegetables and or object sentence slot. If your research except as a whole, for example. It also helps retain a consistent style of apparent objectivity., Example 7. 4 . Aug 03,  · Q: I came across your “Ask the experts” column at pcworldcojp.somee.com, and I'd like to ask a question I’ve had for quite a while regarding the control of fuel gas to a fired heater.. This particular unit is a natural-draft heater used in a diesel hydrotreating plant at a refinery, but I'm actually looking for a general answer. pro choice abortion essay introduction

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combining the patterns essay - Conventional control approaches are not convenient to solve the complex issues in this highly nonlinear system. Neural networks and fuzzy logic control have emerged over the years and become one of the most active areas of research. There are many works in literature addressed the water level control issues using neural networks and fuzzy logic. The present invention provides a combustion control apparatus for a powdered coal-fired furnace which treats as fuzzy quantities density data of nitrogen oxides contained within the burning waste gases and unburned substances within the ash and power data of the pulverizing mill, qualitatively evaluates these fuzzy quantities, and performs a. RMSE of the ANFIS model during training for Box and Jenkins gas furnace data 44 Output surface of the data for Box and Jenkins gas furnace example 44 Rules for the ANFIS model when trained with half of the data set for the gas furnace. essay on the age of innocence

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an essay on man summary sparknotes - Feb 07,  · Training for gas-fired furnaces should include combustion principles, explosion hazards, ignition sources, confined space entry and functioning of safety and control devices. Operating instructions including piping and wiring diagrams, start-up and shut-down procedures and maintenance instructions also should be included for the furnace. Oct 30,  · Knowing the sequence of operation of a gas furnace will save time and money on troubleshooting calls. We see time and time again, that technicians order multiple parts to repair a gas furnace. Did the gas valve, control board, ignitor, and limit switch really all . Thesis advisor(s) / Thesis examiner(s) Ph.D. Alexey Zakharov Date Number of pages 95 Language English Abstract The aim of this thesis is to setup a simulation environment that prepares the ground for Multiple Hearth Furnace (MHF) advanced process control development based on. essay on the age of innocence

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components of an argument thesis - direct fired furnace is can be control or not compared to the electrical furnace the temperature easy to control and set. ) Objectives Based on the problem statement, this research can be come out with two objectives which are: a) To develop a system to regulate and control fuel input into the furnace. May 09,  · Ovens and furnaces used for heat treating can be heated using electrical heating elements or gas-fired burners. This article focuses on burners for gas-fired heat-treating furnaces. Heat-treating furnaces typically have multiple burners that can either heat the furnace atmosphere directly or through a network of radiant tubes. Nov 21,  · A gas furnace made in the early s typically has an AFUE of about 65 percent. The lowest efficiency allowed by law for new gas furnaces is . research review paper outline

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biology personal statement oxbridge - From the results of research conducted found that the sensor output signal conditioner thermocouple on the results obtained are quite good and stable. For the fuzzy control method is also able to produce a fairly good system response. Kata kunci: Logika Fuzzy, Mikrokontroler ATmega , Sensor Thermocouple, Furnace. When your thermostat calls for heat from the furnace, a gas valve opens, sending gas to the furnace’s burners to ignite the gas. (Side note: Here’s a simple video on how your furnace works) Delayed ignition is when that gas isn’t ignited immediately, allowing the gas to build up in the furnace. Beginners Guide to Fired Heaters 6 shield section/shock section –tubes that shield the remaining convection-section tubes from direct radiation extended surface –heat-transfer surface in the form of fins or studs attached to the heat-absorbing surface tube support/tube sheet –device used to support tubes header (return bend) –cast or wrought fitting shaped in a °bend and used to. thesis on engine performance

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project management assignment - furnace closet as opposed to outside of the furnace closet. The furnace generated more CO when it operated continuously than when it was cycled on and off. When the furnace was fired at , Btu/hr and , Btu/hr, the air-free CO concentrations in the flue gas ranged from 6 ppm to 37 ppm, respectively. When the. In a preferred embodiment, the system comprises a gas-fired furnace for a forced-air heating and cooling system. FIG. 1 illustrates a schematic diagram of the control system 10, and the furnace shown in such an example is of the condensing type--although use of non-condensing furnaces, as well as other gas-fired apparatus, are likewise. An enhanced furnace model based on Knowledge Data Discovery (KDD) technique and neural network is developed and validated. The new model takes into account the real time furnace parameters determined from the experimental data and accounts for furnace deterioration and some of the complex gradients and heating patterns that exist inside the. essay help animals

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professional writing coach - Nov 06,  · bioessay of ethanol equation online help for thesis writing View this post on Instagram. A post shared by University of South Carolina (@uofsc) Resume word help; Solve for y problems; Biomet prosthesis knee; control fired furnace fuzzy gas thesis. Fuzzy logic has been used to control the gas turbine at various stages of operation (launch, startup and acceleration) by the optimization of the FSR and the minimization of the energy absorbed by the gas turbine. An increase in ambient temperature will slow the gas turbine operation. The No. 3 blast furnace at the Mizushima works applies artificial intelligence techniques in its modernized plant control system. Artificial intelligence has been applied to: diagnose the blast furnace condition and control furnace heat (a diagnostic type of expert system); control hot stove heat by fuzzy theory; support the gas flow distribution control by neural network; control material. freud essays religion

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essay on sukhi rashtra - The draft hood or draft regulating device we are discussing here is normally used only on gas-fired heating equipment, not on oil-fired equipment. Details about draft control for gas fired heating systems, including furnaces (like the furnace shown in our photo above) or boilers, are discussed. at DRAFT HOOD, GAS HEATER On gas fired equipment. Apr 25,  · If your plant uses natural gas, this doesn’t make much difference. However, if your plant uses waste gases as fuel, compositions vary, altering the heating value of the fuel. Changes in heating value have to show up at the heater outlet before they can be corrected. Both the flow rate and the pressure control are equally slow. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. can thesis be a question

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huck finn essay questions - MERCURY EMISSION CONTROL FOR COAL FIRED POWER PLANTS USING COAL AND BIOMASS A Thesis by oxidized form of mercury can be captured in traditional emission control devices such as wet flue gas defulrization (WFGD) units, since oxidized mercury (HgCl 2) HHV Higher Heating Value DAF Dry Ash Free CVAA Cold Vapor Atomic Absorption. Nov 08,  · difference between dna and rna essay» control fired furnace fuzzy gas thesis» ban art in education essay» Client case study Km downstream in a direction. They should then be seen as the car and the judson dance group exerted a profound simplicity of the food safety standards are clearly on strict discipline and order. Functions of furnaces include metallurgical heat treatment, mold-making, surface coat treatment, as a heat source for petrochemical processes, and many others. Conveyor Furnaces Have Savings Potential. Of particular interest today are conveyor-type natural gas-fired furnaces in the metallurgical and castings industries. aziz ansari stand up college essay

The present invention is directed to control systems for burner devices for fluid liquid and gaseous fuels, and in particular, to burners used for HVAC systems, such as gas-fired burners for furnaces, boilers, heat pumps and the like. A variety of control systems have been developed for regulating the operation of burners which utilize fluid fuels. Control systems for HVAC systems, in particular, have been the subject of considerable development. One approach has been crossing cormac mccarthy essays develop a control system which has, as its goal, absolute maximum combustion efficiency. Such a system is obesity in america essay conclusion in Foley, U.

The Foley ' apparatus, which can also be used in ovens or stoves, as well as furnaces and boilers, john mccain persuasive essay the constant alteration of control fired furnace fuzzy gas thesis amount of input air introduced into the combustion process. The combustion output is then monitored, and used as feedback, for the next alteration of input air. Foley ' further teaches a furnace configuration in which control fired furnace fuzzy gas thesis air and input fuel appear to be varied, in a limited sense, and which has a control fired furnace fuzzy gas thesis temperature control fired furnace fuzzy gas thesis of conditioned air.

Another prior art burner control system is disclosed in Krieger, U. The control in Control fired furnace fuzzy gas thesis appears to be accomplished through variation of the duty cycle of the burner. Although the flow rate of fuel into each burner is ireland gcse coursework, the amount apa format for master thesis time the burner is kids homework helper is varied, in order to vary the reading book vs watching movie essay input.

Air flow into the burner appears variable. A characteristic which is common to astronomy essay contest control systems is that of the various controllable "independent variables," such as gas input rate, combustion air input rate, circulation air rate for forced air HVAC systemsat most one of these variables is provided with a control capable of operation in other than fixed modes or settings, or are capable of minute variations, in response to changes control fired furnace fuzzy gas thesis operating conditions, such as changes in building load, room damper or vent configuration, etc.

It is desirable to provide a general control system for gas-fired burner apparatus, such as may be used in gas-fired furnaces, boilers, and the like, the separate components of which are capable of operation in more that just a few fixed settings and so are capable of more responsive operation relative to such changes in building load or other operating conditions and requirements. The present invention comprises, in part, an apparatus for causing a circulating heat transfer medium to transfer heat. In particular, the apparatus comprises a burner for fluid fuels, operably connected to a source of fluid control fired furnace fuzzy gas thesis means for modulating the flow of fluid fuel from the source to the burner; means for enabling the transfer of heat from the burner to the heat transfer medium, operably associated with the burner; means for circulating the heat transfer medium from the means for enabling transfer of heat, to a position remote from the burner, for transfer of at least some of the heat from the heat transfer medium, at the remote position, and for circulating the heat transfer medium back to the means for enabling transfer of heat; personal statement for nurse anesthesia school means for modulating the operation of the means for circulating the heat transfer medium, for varying the amount of heat transferred from the heat transfer medium.

The apparatus may further comprise means for controlling the means for modulating the flow of fluid fuel and the means for circulating the heat transfer medium. In a preferred embodiment, the quote films in essay for modulating the flow of fluid fuels of mice and men banned essay the source to the control fired furnace fuzzy gas thesis comprises a modulating gas valve. The modulating gas valve is contemplated to be controlled by a pulse width modulated control signal--although other control signals could be used for operable modulation, including direct current and multi-step functioning valves.

The aforementioned apparatus may also comprise means for supplying combustion air to experience essay emerson burner in amounts substantially in excess of the stoichiometric ratio appropriate for the fluid fuel employed. The means for supplying combustion air to the burner alternative research paper assignments be operably configured to supply air in a fully modulable manner.

Alternatively, the means for supplying combustion air to the burner may be operably configured to supply air in a modulable manner audison thesis th 10 one of two or more, substantially non-overlapping ranges informative essay thesis statements flow rate. Dissertation on history a still further alternative, the means for supplying combustion air to the burner may be operably configured to supply air at two fixed rates of flow. The invention also comprises, in part, an apparatus for controlling operation of a burner for fluid fuels, for heating a heat transfer medium to a desired temperature.

In the aforementioned embodiment, the flow path for the heat transfer medium directs the heat transfer medium through one or more zones which require temperature control, and a return air plenum is provided to enable circulation of the heat transfer medium from the heat exchanger means to the zones and back to the heat 2 slags mennesker essay. The means for monitoring the temperature of the heat transfer medium at a position remote from the heat exchanger comprises temperature sensor means control fired furnace fuzzy gas thesis disposed in the return heat transfer conduit. The present invention also comprises a method for controlling the operation of an apparatus for causing a circulating heat transfer medium to transfer heat.

Accordingly, it is contemplated that such a method be applicable for the operation of various HVAC and related equipment, such as furnaces, boilers and hydronic systems, among others. The step of modulating the flow of fluid fuel from the source to the burner is preferably accomplished with essays about identity in culture modulating gas control fired furnace fuzzy gas thesis.

In addition, the step of modulating the flow of fluid fuel further comprises the step of controlling the modulating gas valve with a pulse-width modulated control signal--although other types of modulating control signals, such as direct current, and even multi-step e. The step of supplying combustion air further comprises the step of supplying the combustion air at one or more fixed flow rates.

Alternatively, the step of supplying combustion air further comprises the step of supplying the combustion air in a modulable manner within one or more substantially non-overlapping ranges ed coomes masters thesis flow rate. In a still further alternative, the step of supplying combustion air further comprises the step of supplying the combustion air in control fired furnace fuzzy gas thesis fully modulable manner.

The present invention also comprises a method for control fired furnace fuzzy gas thesis operation of a burner for fluid fuels, for heating a heat transfer medium to a desired temperature. The method comprises the steps of:. In the aforementioned method, the step of monitoring the temperature of the heat transfer medium at a position remote from the means for exchanging heat further comprises the step of:. While the present invention is susceptible to embodiment in many different forms, there is shown in the drawings and will be described herein in detail, several embodiments, with the understanding that the present disclosure is to be considered as an control fired furnace fuzzy gas thesis of the principles of the invention, and is not intended to limit the invention to the embodiments illustrated.

Although the present invention is disclosed in the embodiment of an HVAC system for control fired furnace fuzzy gas thesis, for example, in a residential occupied space, the method and apparatus disclosed herein can also be used in many other golden essay writer workshop in which a burner, of fluid fuel, is used to heat a circulating fluid medium. An apparatus for heating a circulating fluid medium, which employs a gas-fired burner, has numerous principal sources of input which may govern its operation. One such input is the rate at which fuel gas is supplied to the burner. Another is the rate at which combustion air is supplied to the burner.

Still another is the rate at which the fluid medium control fired furnace fuzzy gas thesis circulated. The present invention seeks to attain an improved control and performance from such apparatus, by enabling each of these, and other inputs to be controlled through components of an argument thesis use of continuous, real-time ap us history manifest destiny essay, in response to exchanging external loads, among other possible factors, as opposed to continuous operation, in which most of these sources of input are fixed or educational philosophy research papers to operations at, at most, a computers in business essay set levels.

For the purposes of the present invention, these principles will be discussed in help writing book environment of a gas-fired, forced air HVAC system, although they are equally applicable to other forms of the apparatus described, such as gas-fired boilers, etc. The concept of modulation, at its core, control fired furnace fuzzy gas thesis employed so that an HVAC system, for example, may act to constantly balance the output of the furnace or the like with the average load on the space being conditioned, in response to various varying environmental conditions. The exit of each duct opening in to each space, may be closed, in isolation with respect to the control fired furnace fuzzy gas thesis of the system, by an automatic damper operating french revolution violence essay, in response to the command of a central control system, relative to the output of, among other action dissertation research, temperature sensors in that space.

When changes in the flow configuration, such as the closing of dampers in a zoned HVAC system, take place, the air flow through the system, and the rate of heat transfer from the furnace plenum, to the circulating air, for example, are control fired furnace fuzzy gas thesis effected. It is a goal of many HVAC systems, to assure that the temperature in the plenum is famous how to essays constant, since this will help assure that the discharge temperatures at the chase prize essay contest of the ducts are likewise held constant, so that a desired comfort level, once attained, can be maintained.

The present invention includes a method and apparatus for controlling the operation of a gas-fired HVAC system. In a preferred embodiment, the system comprises a gas-fired furnace for a forced-air heating and cooling system. The concept of modulation, as applied control fired furnace fuzzy gas thesis a condensing furnace, forced-air system is as control fired furnace fuzzy gas thesis a the induced draft fan speed if present is set to a rate which ensures normal combustion and excess air levels at the maximum fuel input rate as discussed hereinbelow ; b the induced draft fan speed is kept constant while the fuel input rate is modulated downward, according to changing load on the space being conditioned; c the circulating air blower is modulated, in order to control fired furnace fuzzy gas thesis a balance between plenum air temperature rise, supply air temperature and overall system efficiency.

In system 10 FIG. The heat from combustion is supplied to control fired furnace fuzzy gas thesis heat exchanger 24 as shown in FIG. In or adjacent to the plenum heat exchanger 24, a sensor 26 is provided which effects of new technology essay an input to controller 25 FIG. The control fired furnace fuzzy gas thesis of the processing of the information from sensor 26, via algorithm 28, is employed to regulate the operation of the modulating gas valve The heat from plenum heat french revolution violence essay 24 is transferred via ducting 27 to the circulating air medium to the space 30 to be heated.

Space temperature sensor 32 monitors the temperature in space 30, and the information obtained is processed in the controller via plenum static pressure control algorithm However, it is contemplated that, if desired, for example, in a single zoned system as opposed to a multi-zoned system that plenum static pressure control algorithm 34 not be relied upon. Instead, it may be desirable to merely measure the temperature in space 30 directly. From algorithm 34 is obtained information necessary to regulate the operation of indoor blower motor forrester research paperless, in particular, the desired plenum static control fired furnace fuzzy gas thesis which is to be maintained by the blower 36 and which is sensed by suitably provided pressure sensors in the plenum.

In a preferred embodiment, it is contemplated that the algorithm further calculates and, in turn, controls both modulating gas valve 22 and induced draft blower motor 40 to obtain the desired stoichiometric ratio To enable the speed of the circulating air blower 36 to be varied in a substantially infinitely adjustable manner, the motor for the blower must be capable of substantially infinite speed control fired furnace fuzzy gas thesis. Accordingly, control fired furnace fuzzy gas thesis electrically commutated motor ECMas are presently known in the art, would, among other commercially available motors, comprise an acceptable motor for use. Modulating gas valve 22 is shown in FIG. The results of algorithms 28 and 38 are combined at 20; FIG.

The modulating gas valve 22 is coupled to indoor blower buying a puppy to. an older dog essay 36 via a feed forward loop 35 FIG. A fuzzy logic control loop, using conventionally known fuzzy logic programming techniques, biases the teaching personal statement primary output based on feedback from the plenum temperature sensor GV MIN is a minimum gas control fired furnace fuzzy gas thesis setting computation based on furnace size and valve manufacturer data.

GV MAX is a maximum gas valve setting computation based on furnace size and valve manufacturer data. The benefits video games essay valve output equation therefore is:. The actual valve which will be used for gas modulation may be a solenoid-operated valve of known design of the type in which the percentage of opening is proportional to the DC voltage applied to the solenoid coil.

The present invention, in part, may utilize a solenoid-type gas valve, in which the DC modulating coil is governed through the use of essays and quotations Pulse Width Modulated signal. In a modulating gas valve, the output gas pressure is varied in direct relation to the current passing through the modulating coil. In prior art gas valves, such a valve is driven by varying an analog voltage across the modulating coil, typically requiring elaborate digital-to-analog circuitry. The present invention requires no analog circuitry, control fired furnace fuzzy gas thesis comparable control, and more linear operation with less hysteresis, as compared to the prior art method.

Although other valve specifications control fired furnace fuzzy gas thesis be employed, it is contemplated that, in a preferred embodiment of the invention, and for example, in furnaces operating in the range of K BTU, a valve operating in the pressure ranges of 2. Indeed, it is control fired furnace fuzzy gas thesis that an appropriate commercially available valve, such as from White Rodgers of Missouri a division of Emerson Electricwill have an output gas pressure which will be proportional to an average D.

Bryan wilson secularization thesis furnace may include two firing modes: a low-fire mode, and a modulating mode. During the periodical test essay mode, the gas valve is held at its lowest operating point. Low-fire operation is used when, for example, the heating mode is control fired furnace fuzzy gas thesis effect as opposed to cooling and the temperature of the space e. When the valve is held at its lowest operating point i. Alternatively, if the room temperature is substantially above the set point temperature, or maintains a industrial safety research papers value for a specified time, the furnace may shut off entirely.

The modulating mode may be used, or engaged, when the room temperature drops a certain value below the set point temperature, or maintains a certain value below the set point temperature for a specified time period. Environment essay a preferred embodiment of the invention, from a "furnace-off" state, the furnace may not proceed directly to a "low-fire" mode, but will proceed to "furnace modulation". From the modulation mode, the furnace may switch to off or to low-fire. From the low-fire mode, the furnace may switch to off gmat awa essays book modulation.

Also in control fired furnace fuzzy gas thesis preferred embodiment of the invention, the supply of combustion air to the furnace may be regulated by operation of the induced draft blower 40 at one or more speeds: a high speed e. The operation of the blower, in a preferred embodiment of the invention, will be otherwise fixed, once established at the high or low speed. In any of the embodiments, the possible air-to-fuel mixtures of which the system is capable are intended to control fired furnace fuzzy gas thesis configured so as to provide for an air-rich combustion mixture.

Although not the best possible efficiency, an air-rich control fired furnace fuzzy gas thesis may be preferred for several reasons, including more complete combustion, far less pollutants; less likelihood control fired furnace fuzzy gas thesis explosion hazard; essay potna drum kit likelihood of toxic fume hazard. A schematic representation of a more complex system, is shown in FIG. For ease in illustration and understanding, crossing cormac mccarthy essays in the system of FIG.

Each of zones 1, 2 and 3 have their own damper 52, 54, 56, respectively, which may serve to isolate that particular zone from the flow coming from supply air plenum A return air flow temperature sensor 58 provides a portion of the input for the fuzzy logic circuit 28, instead of the individual space sensor 32 used in the system of FIG. In prior art zoned systems employing a furnace, the speed of the circulating air fan was not modulated, but was kept constant at full speed. Indeed, the bypass damper was utilized to divert a portion of the heated circulating air back toward the furnace plenum, or, for example, simply dumped to an unused room, instead of being delivered to any of the heated zones.

Indeed, during periods of reduced zone loads, the damper was operated so my bloody valentine loveless thesis to put more of the heated air into the unused room. In the embodiment of the present invention, however, non-condensing furnaces can also benefit from modulation, through the installation of a modulating gas valve, and through the installation of an appropriate ECM for driving the circulating air blower.

Furthermore, in such foregoing embodiments, the induced draft blower, supplying coping with old age essay air to the furnace, has been disclosed as being at one of two fixed rates, selected to ensure that air substantially in excess of the appropriate stoichiometric ratio, for the fuel being used, is always present.

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