Heating system
First Claim
1. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired temperature comprising:
- measuring a temperature outside the structure;
delaying the measured outside temperature for a predetermined interval; and
automatically adjusting the rate of a continuous flow of fuel to the furnace as a function of the difference between the desired temperature of the structure and the delayed, previously measured value of the outside temperature;
whereby the structure temperature achieved is substantially equal to the desired structure temperature, the furnace operates substantially continuously at a reduced energy input, and the energy input to the furnace and the energy output from the furnace vary in response to changes in the outside temperature.
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Accused Products
Abstract
A method and system for modifying a conventional furnace are disclosed whereby greatly improved furnace operating efficiency is obtained. The temperature of the structure, the outside temperature, and the temperature of the heat exchange fluid are measured. The rate of flow of fuel to the furnace is adjusted as a function of the difference between the outside temperature and the desired temperature of the structure. The fuel rate flow is further adjusted as a function of the difference between the furnace'"'"'s heat exchange fluid temperature and the actual interior temperature of the structure. A further adjustment to fuel rate flow is effected as a function of the difference between the temperature of the interior of the structure and the desired structure temperature. A novel gas pressure valve is also disclosed for altering the rate of gas flow to the furnace.
23 Citations
28 Claims
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1. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired temperature comprising:
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measuring a temperature outside the structure; delaying the measured outside temperature for a predetermined interval; and automatically adjusting the rate of a continuous flow of fuel to the furnace as a function of the difference between the desired temperature of the structure and the delayed, previously measured value of the outside temperature; whereby the structure temperature achieved is substantially equal to the desired structure temperature, the furnace operates substantially continuously at a reduced energy input, and the energy input to the furnace and the energy output from the furnace vary in response to changes in the outside temperature. - View Dependent Claims (2)
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3. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired temperature comprising:
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measuring a temperature outside the structure; and automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the measured outside temperature, said fuel input rate being adjusted in proportion to the product of a selected outside fire ratio (OFR) factor and the difference between the desired room temperature and said outside temperature, the OFR factor being selected to effect maximum fire size when the outside temperature is at the lowest value which the furnace is designed to accommodate.
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4. For use with a heating system which includes a furnace for heating a structure by means of a heat exchange fluid, a method of controlling the energy released by the furnace for efficiently heating the structure to a desired temperature comprising:
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measuring a temperature outside the structure; automatically adjusting the rate of a continuous flow of fuel to the furnace as a function of the difference between the desired temperature of the structure and the measured outside temperature; readjusting the fuel input rate to the furnace by; measuring the temperature of the heat exchange fluid; measuring the actual temperature of the interior of the structure; and altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure.
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5. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired temperature by means of a heat exchange fluid, comprising:
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measuring a temperature outside the structure; measuring the temperature of the heat exchange fluid; measuring the actual temperature of the interior of the structure; automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the measured outside temperature; and altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure, said alteration being effected as a function of the product of a selected plenum fire ratio (PFR) factor and the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure, where the PFR factor is a measure of the percent change in furnace fire size required to change the temperature of the heat exchange fluid by one degree.
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6. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired temperature by means of a heat exchange fluid, comprising:
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measuring a temperature outside the structure; measuring the temperature of the heat exchange fluid; measuring the actual temperature of the interior of the structure; automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the measured outside temperature; altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure, said alteration including;
computing a factor A corresponding to the difference between desired structure temperature and the outside temperature minus the actual structure temperature;subtracting from the factor A a factor B corresponding to the difference between the temperature of the heat exchange fluid and the actual structure temperature; and altering the fuel input rate as a function of the difference between the factors A and B. - View Dependent Claims (7, 8)
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9. A method of controlling the energy released by a furnace for efficiently heating s structure to a desired temperature comprising:
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measuring a temperature outside the structure; automatically adjusting the rate of a continuous flow of fuel to the furnace as a function of the difference between the desired temperature of the structure and the measured outside temperature; measuring the actual temperature of the interior of the structure; and further adjusting the fuel input rate to the furnace as a function of the difference between the actual temperature of the interior of the structure and the desired structure temperature.
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10. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired temperature comprising:
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measuring a temperature outside the structure; measuring the actual temperature of the interior of the structure; automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the measured outside temperature; and further adjusting the fuel input rate to the furnace as a function of the difference between the actual temperature of the interior of the structure and the desired structure temperature, said further adjusting including adjusting the fuel input rate to the furnace in proportion to the product of a selected structure fire ratio (SFR) factor and the difference between the structure'"'"'s actual temperature and the desired structure temperature, where the SFR factor is indicative of the percent change in the furnace'"'"'s full fire size desired for a change in the temperature of the structure of one degree.
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11. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired room temperature by means of a heat exchange fluid, comprising:
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roughly adjusting the fuel input rate to the furnace by measuring a temperature external to the structure, sensing the desired room temperature, and automatically adjusting the rate of a continuous flow of fuel to the furnace as a function of the difference between the desired temperature of the structure and the measured external temperature; further adjusting the fuel input rate by measuring the temperature of the heat exchange fluid, measuring the actual temperature of the interior of the structure, and altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure; and further adjusting the fuel input rate as a function of the difference between the actual temperature of the interior of the structure and the desired structure temperature. - View Dependent Claims (12)
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13. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired room temperature by means of a heat exchange fluid, comprising:
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roughly adjusting the fuel input rate to the furnace by measuring a temperature external to the structure, delaying the measured external temperature for a predetermined interval, sensing the desired room temperature, and automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the delayed external temperature, said function of the difference between the desired structure temperature and the delayed external temperature being proportional to an outside fire ratio (OFR) factor selected to effect maximum furnace fire size when the outside temperature is at the lowest value which the furnace is designed to accommodate; further adjusting the fuel input rate by measuring the temperature of the heat exchange fluid, measuring the actual temperature of the interior of the structure, and altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure; and further adjusting the fuel input rate as a function of the difference between the actual temperature of the interior of the structure and the desired structure temperature.
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14. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired room temperature by means of a heat exchange fluid, comprising:
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roughly adjusting the fuel input rate to the furnace by measuring a temperature external to the structure, delaying the measured external temperature for a predetermined interval, sensing the desired room temperature, and automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the delayed external temperature; further adjusting the fuel input rate by measuring the temperature of the heat exchange fluid, measuring the actual temperature of the interior of the structure, and altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure, said function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure is proportional to a selected plenum fire ratio (PFR) factor, where the PFR factor is a measure of the percent change in furnace fire size required to change the temperature of the heat exchange fluid by one degree; and further adjusting the fuel input rate as a function of the difference between the actual temperature of the interior of the structure and the desired structure temperature.
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15. A method of controlling the energy released by a furnace for efficiently heating a structure to a desired room temperature by means of a heat exchanger fluid, comprising:
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roughly adjusting the fuel input rate to the furnace by measuring a temperature external to the structure, delaying the measured external temperature for a predetermined interval, sensing the desired room temperature, and automatically adjusting the fuel input rate to the furnace as a function of the difference between the desired temperature of the structure and the delayed external temperature; further adjusting the fuel input rate by measuring the temperature of heat exchange fluid, measuring the actual temperature of the interior of the structure, and altering the fuel input rate to the furnace as a function of the difference between the temperature of the heat exchange fluid and the actual temperature of the interior of the structure; and further adjusting the fuel input rate as a function of the difference between the actual temperature of the interior of the structure and the desired structure temperature, said latter function being proportional to a selected structure fire ratio factor indicative of the percent change in the furnace'"'"'s full fire size desired for a change in the temperature of the structure of one degree.
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16. A system for efficiently heating a structure to a desired temperature with a heat exchange fluid by controlling the energy released by a furnace which has a main gas valve and which is adapted to operate at no less than a minimum fire size, said system comprising:
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means for generating a first signal representative of outside temperature; means for generating a second signal representative of desired room temperature; control means receiving said first and second signals for developing a fire size signal as a function of the difference between said first and second signals; valve means responsive to said fire size signal for varying the rate of fuel flow to the furnace; and means responsive to the fire size signal being of a value which is too small to effect a minimum fire size for intermittently opening and closing the main gas valve.
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17. A system for efficiently heating a structure to a desired temperature with a heat exchange fluid by controlling the energy released by a furnace which has a main gas valve and a thermostat for conventionally controlling actuation of the main gas valve, said system comprising:
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means for generating a first signal representative of outside temperature; means for generating a second signal representative of desired room temperature; control means receiving said first and second signals for developing a fire size signal as a function of the difference between said first and second signals; valve means responsive to said fire size signal for varying the rate of fuel flow to the furnace; and means for energizing said control means for overriding the thermostat, and for reverting to thermostat control of the furnace.
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18. A system for controlling the energy released by a furnace for efficiently heating a structure to a desired temperature by a heat exchange fluid comprising:
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means for generating a first signal representative of outside temperature, including a wind chill sensor located externally of the structure and means for heating said sensor as a function of heat loss from the structure; means for generating a second signal representative of desired room temperature; control means receiving said first and second signals for developing a fire size signal as a function of the difference between said first and second signals; and valve means responsive to said fire size signal for varying the rate of fuel flow to the furnace. - View Dependent Claims (19, 20)
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21. A system for controlling the energy released by a furnace for efficiently heating a structure to a desired temperature by a heat exchange fluid comprising:
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means for generating a first signal representative of outside temperature; means for generating a second signal representative of desired room temperature; means for generating a third signal representative of actual structure temperature; means for generating a fourth signal representative of plenum temperature; control means receiving said first and second signals for developing a fire size signal as a function of the difference between said first and second signals and receiving said third and fourth signals for altering the fire size signal responsive to the difference between said third and fourth signals; and valve means responsive to said fire size signal for varying the rate of fuel flow to the furnace. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification