Temperature control systems with programmed dead-band ramp and drift features

• US 4,557,317 A
• Filed: 10/05/1983
• Issued: 12/10/1985
• Est. Priority Date: 02/20/1981
• Status: Expired due to Term

• Current Assignee: Kermit S. Harmon Jr
• Original Assignee: Kermit S. Harmon Jr
• Inventors: Harmon, Kermit S. Jr.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US06/539,371
• Time in Patent Office: 797 Days
• Field of Search: 165/21, 165/12, 165/2, 62/157, 236/46 R, 236/44 C
• US Class Current: 165/201
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/46 Improving electric energy efficiency or saving
• CPC Class Codes: F24F 11/52 Indication arrangements, e.g. displays
• CPC Class Codes: F24F 11/61 using timers
• CPC Class Codes: F24F 11/67 Switching between heating and cooling modes
• CPC Class Codes: F24F 11/88 Electrical aspects, e.g. circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2110/20 Humidity
• CPC Class Codes: F24F 2120/20 Feedback from users
• CPC Class Codes: F24F 2221/54 Heating and cooling, simultaneously or alternatively
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor

Abstract

Energy saving temperature and humidity sensing and control processes, system and apparatuses operate effectively in response to signals received from occupants and to dynamic responses of building and its heating, ventilating and air conditioning system. The disclosed processes, apparatuses and system utilize thermostats equipped with a drift ramping and hold time to save energy; the thermostats only need resetting to a neutral/comfort set point which is accomplished by means of a push button or touch plate.

The disclosed systems are pre-programmed and set so that occupants will be confortable although the temperature within the building drifts because the rate of drift is controlled to a gradual and normally unnoticed change.

Claims

1. Temperature sensing apparatus for modulating air heating and cooling apparatus connected to a space within a building, including sensor means sensitive to air temperature in said space and connected through a thermal condition measuring means having an output to a control means and proportional to said air temperature, said control means comprising:

a power source;

a cycle selector assembly including a temperature sensor unit, a logic unit assembly, and a series of electrical units each sensitive to the output of said temperature sensor unit;

a temperature control assembly including a resistor bank assembly, a resistor control unit, and a temperature range control unit, the temperature range control unit being a 555 integrated circuit timer, said resistor bank assembly including a series of resistor unit assemblies, each of said resistor unit assemblies including electric resistors having a different value of electrical resistance than other resistor unit assemblies in the resistor bank assembly, said resistor control unit including a drive means for providing progressive changes of resistance values of said resistor unit assemblies, different portions of each of said resistor unit assemblies connected between different pairs of resistor terminal wires connected to an input of the temperature range control unit;

first programming means to actuate said heating and cooling apparatus to bring said air in said space to thermal comfort conditions and maintain said air at said thermal comfort conditions; and

second programming means to progressively change at a predetermined ramp rate conditions to which said control means reacts for permitting the temperature in said space to change at a controlled rate and in an energy conserving direction from said thermal comfort conditions within a preselected dead-band range.

2. Apparatus as in claim 1 wherein the resistor control unit comprises a stepping circuit which provides timed and stepped increments of change of resistance value of the resistors of the resistor bank assembly connected to the input of the temperature range control unit.

3. Apparatus as in claim 1 wherein the resistor control unit comprises a drive means providing continuous change of values of electrical resistances connected to the input of the temperature range control unit.

4. Temperature and humidity sensing apparatus for modulating air heating and cooling apparatus connected to a space within a building, including sensor means sensitive to air temperature and to humidity in said space and connected through a thermal condition measuring means having an output to a control means and proportional to said air temperature and humidity, said control means comprising:

a power source;

a cycle selector assembly including a temperature sensor unit, a logic unit assembly, and a series of electrical units each sensitive to the output of said temperature sensor unit;

a temperature control assembly including a resistor bank assembly, a resistor control unit, a temperature range control unit, the temperature range control unit being a 555 integrated circuit timer, said resistor bank assembly including a series of resistor unit assemblies, each of said resistor unit assemblies comprising electric resistors having a different value of electrical resistance than other resistor unit assemblies in the resistor bank assembly, said resistor control unit including a drive means for providing progressive changes of resistance values of said resistor unit assemblies, different portions of each of said resistor unit assemblies connected between different pairs of resistor terminal wires connected to an input of the temperature range control unit;

first programming means to actuate said heating and cooling apparatus to bring said air in said space to thermal comfort conditions and maintain said air at said thermal comfort conditions; and

second programming means to progressively change at a predetermined ramp rate conditions to which said control unit reacts for permitting the temperature in said space to change at a controlled rate and in an energy conservation direction from said thermal comfort conditions within a preselected dead-band range.

5. Apparatus as in claim 4 wherein the resistor control unit comprises a stepping circuit which provides timed and stepped increments of change of resistance value of the resistors of the resistor bank assembly connected to the input of the temperature range control unit.

6. Apparatus as in claim 4 wherein the resistor control unit comprises a drive means providing continuous change of values of electrical resistances connected to the input of the temperature range control unit.

7. Apparatus as in claim 4 comprising a humidity transducer located within a wall mounted housing in said building and control rheostats in said effective temperature sensor unit and in said range control unit, the humidity transducer operatively connected to said rheostats through a rheostat actuating means.

8. Apparatus as in claim 7 wherein one of said rheostats connected to said humidity transducer is serially connected to a thermistor in an electric circuit of said range control unit and another of said rheostats is serially connected to a thermistor in an electric circuit of said effective temperature sensor unit whereby to add the effects of measurements by said humidity transducer and by said thermistors.

9. Apparatus as in claim 8 wherein said humidity transducer and said thermistor both have positive temperature coefficients of resistance.

10. Apparatus as in claim 9 wherein said humidity transducer and said thermistor both have negative temperature coefficients of resistance.

11. Apparatus as in claim 10 wherein said rheostats are connected to provide changes in the electrical resistances in the temperature sensor circuit and in the temperature range control unit that change in the same direction on increase in said air humidity and in said air temperature.

12. A system for temperature control of an inhabited space including heating means, cooling means, fan means, temperature sensing means operatively connected to said space, and control means operatively connected to said heating means, said cooling means, said fan means, and said temperature sensing means, said control means comprising:

temperature setting means for setting temperature variation limits at which one of said heating and cooling means is activated and deactivated,

time setting means for setting a time period during which one of said heating and cooling means is automatically activated for maintaining temperature within said space within said variation limits;

limit change means for automatically changing said variation limits at which one of said heating and cooling means is activated and deactivated, said changing of said variation limits being in an energy conserving direction and said changing being at a rate of no more than approximately 1 deg. F. per hour; and

control means controlling said upper and lower limits in response to the length of time since said temperature setting means is actuated.

13. System as in claim 12 wherein said temperature sensing means comprises a temperature sensitive electrical element in contact with a thermally conductive metallic plate directly exposed to said space, said thermally conductive metallic plate having a surface to mass ratio of between 1.2 and 1.3 square centimeters per gram.

14. System as in claim 13 wherein said plate has a surface area of 15 to 17 square centimeters.

15. System as in claim 14 wherein said thermally conductive metallic plate has an exterior gold surface.

16. System as in claim 14 and comprising also signaling means responsive to the period of time for which said heating and cooling means are set to be activated and to the actuation of said heating and cooling means.

17. System as in claim 14 wherein the time after which change of the setting temperatures is initiated is responsive to a number of touches applied to said plate.

18. System as in claim 17 wherein said temperature at which one of said heating and cooling means is activated and deactivated is set by the number of touches applied to said plate.

19. Apparatus as in claim 13 wherein the change of temperature at which said heating means and cooling means are activated and deactivated is reset to a predetermined value is determined by the number of touches applied to set plate.

20. A sensing and control unit for a system for temperature control of an inhabited space, including heating means, cooling means, fan means, and temperature sensing means operatively connected to said space, said sensing and control unit operatively connected to said heating means, said cooling means, said fan means, and said temperature sensing means, said sensing and control unit comprising:

a support assembly adapted to be fixed to a habitation enclosure wall;

a control and programming unit including a thermally sensitive element;

temperature setting means for setting temperature variations limits at which signals are sent to one of said heating and cooling means for activation and deactivation thereof;

time setting means for setting a time period during which said control signals are sent by said control and programming unit to one of said heating and cooling means;

limit change means for automatically changing said variation limits at which signals are sent to one of said heating and cooling means, said changing of said variation limits being in an energy conserving direction and at a predetermined rate; and

control means for automatically controlling said upper and lower limits in response to the length of time since said control unit sends control signals to said one of heating and cooling means.

21. A sensing and control unit as in claim 20 wherein said temperature sensing means comprises a temperature sensitive electrical element in contact with a thermally conductive metallic plate on an external surface of said sensing and control unit, said thermally conductive metallic plate having a surface to mass ratio of between 1.2 and 1.3 square centimeters per gram.

22. Apparatus as in claim 21 wherein said plate has a surface area of 15 to 17 square centimeters.

23. Apparatus as in claim 22 wherein said thermally conductive metallic plate has an exterior gold surface.

24. Apparatus as in claim 20 and comprising also signaling means on the exterior surface of said sensing and control unit responsive to the period of time for which said heating and cooling means are set to be activated and to the actuation of said heating and cooling means.

25. Apparatus as in claim 20 comprising timing means setting the time periods at which changes of the temperature settings initiated are responsive to the number of touches applied to said plate.

26. As in claim 25 comprising means whereby the temperature at which said heating and cooling means are activated and deactivated is responsive to the number of touches applied to said plate.

27. Apparatus as in claim 25 comprising means whereby the temperature at which said sensing and control unit sends control signals to said heating means and cooling means is reset to a value relative to sensed temperature, said reset in response to the number of touches applied to said plate.

28. Apparatus as in claim 20 where each of said heating means and said cooling means and said fan means has a relay control therefor and said relay control is operatively connected to said control unit whereby to provide power thereto.

29. A temperature control process for controlling space temperature within an occupied building uitilizing heating and/or cooling units, comprising:

selectively setting a desired initial comfort temperature setting and a desired final comfort temperature setting for said space temperature;

sensing said space temperature and providing an output signal functionally related to dry bulb temperature, ambient mean radiant temperature, and air velocity;

automatically activating said heating and/or cooling units in response to said output signal and said initial comfort temperature setting to maintain said space temperature at approximately said desired initial comfort temperature setting during at least a predetermined first period of time;

thereafter repeatedly and automatically altering desired temperature settings as a function of time in an energy conserving direction during a second period of time of a duration of at least several hours and at a predetermined temperature ramp rate equal to or less than approximately 1°

F. per hour;

automaticaly activating said heating and/or cooling units in response to said output signal and said altered temperature settings to maintain said space temperature at approximately said altered temperature settings during at least said second period of time;

automatically prohibiting alteration of said space temperature settings beyond said desired final comfort temperature setting; and

thereafter automatically actuating said heating and/or cooling units in response to said output signal and said final comfort temperature setting to maintain said space temperature at approximately said desired final comfort temperature setting.

30. The process as defined in claim 29, further comprising:

maintaining said space temperature at approximately said desired final comfort temperature setting until selectively resetting a comfort temperature setting.

31. The process as defined in claim 30, when said comfort temperature setting is selectively reset automatically to said desired initial comfort temperature setting.

32. The process as defined in claim 30, wherein said comfort temperature setting is reset by a randomly timed operator input command.

33. The process as defined in claim 32, wherein said operator input command occurs substantially simultaneously with said resetting of said comfort temperature setting.

34. The process as defined in claim 32, wherein said desired temperature settings are altered during said second period of time in accordance with pre-programmed commands.

35. The process as defined in claim 29, wherein said first period of time is one-half hour or more.

36. The process as defined in claim 29, wherein said first period of time is selectively adjustable by occupants within said building.

37. The process as defined in claim 29, wherein said temperature ramp rate is selectively adjustable by occupants within said building.

38. The process as defined in claim 29, wherein said first period of time commences when said space temperature reaches said desired initial comfort temperature setting.

39. The process as defined in claim 29, wherein said first period of time commences when heating and/or cooling units are activated.

40. Temperature control apparatus for controlling space temperature for occupants within a building utilizing heating and/or cooling units, comprising:

temperature setting means responsive to occupant interaction for selectively setting a desired initial comfort temperature setting and a desired final comfort temperature setting;

thermal sensing means for sensing said space temperature and providing an output signal functionally related to dry bulb temperature, ambient mean radiant temperature, and air velocity;

control means for automatically activating said heating and/or cooling units in response to said output signal to maintain said space temperature at approximately said desired initial comfort temperature setting during at least a predetermined first period of time;

programming means for repeatedly and automatically altering desired temperature settings as a function of time in an energy conserving direction during a second period of time of a duration of at least several hours and at a predetermined temperature ramp rate equal to or less than approximately 1°

F. per hour;

limit means for automatically prohibiting alteration of said space temperature settings beyond said desired final comfort temperature setting; and

said control means automatically activating said heating and/or cooling units in response to said output signal and said altered temperature settings to maintain said space temperature at approximately said altered temperature settings during at least said second period of time.

41. The apparatus as defined in claim 40, further comprising:

reset means for automatically resetting a comfort temperature setting at said initial comfort temperature setting.

42. The apparatus as defined in claim 41, wherein said reset means is responsive to randomly timed operator input commands.

43. The apparatus as defined in claim 40, further comprising:

means for selectively adjusting said first period of time in response to interaction by occupants within said building.

44. The apparatus as defined in claim 40, further comprising:

means for selectively adjusting said temperature ramp rate in response to interaction by occupants within said building.

45. Apparatus for space temperature control of an occupied building including heating means and control means for actuating said heating means, said control means comprising:

thermal sensing means operatively connected to said space to provide an output signal functionally related to dry bulb temperature, ambient mean radiant temperature, and air velocity;

temperature setting means for setting a desired initial comfort temperature setting and a desired final comfort temperature setting at which said heating means is activated and deactivated;

setting change means for automatically changing temperature settings at which said heating means is activated and deactivated during a period of time of at least several hours, said changing of said temperature settings from said desired initial comfort temperature setting being in an energy conserving direction and said changing being at a temperature ramp rate of no more than approximately 1°

F. per hour;

limit means for limiting said changing temperature settings to a value representative of said desired final comfort temperature setting; and

said control means automatically activating said heating means in response to said thermal sensing means ouput signal and said temperature settings.

46. The apparatus as defined in claim 45, further comprising:

reset means for automatically resetting said space temperature setting at said initial comfort temperature setting.

47. The apparatus as defined in claim 46, wherein said reset means is responsive to randomly timed operator input commands.

48. The apparatus as defined in claim 45, further comprising:

time set means for setting a first period of time during which said heating means is automatically activated for maintaining said space temperature at approximately said initial comfort temperature setting.

49. The apparatus as defined in claim 48, further comprising:

means for selectively adjusting said first period of time in response to interaction by occupants within said building.

50. The apparatus as defined in claim 49, wherein said first period of time is one-half hour or more.

51. The apparatus as defined in claim 45, further comprising:

means for selectively adjusting said temperature ramp rate in response to interaction by occupants within said building.

52. The apparatus as defined in claim 45, wherein said first period of time ccommences when said space temperature reaches said desired initial comfort temperature setting.

53. The apparatus as defined in claim 52, further comprising:

reset means for automatically resetting said space temperature setting at said initial comfort temperature setting.