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

• US 4,655,279 A
• Filed: 10/15/1985
• Issued: 04/07/1987
• 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 F.
• Application Number:
  US06/787,751
• Time in Patent Office: 539 Days
• Field of Search: 165/12, 165/2, 62/157, 236/46 R, 364/557
• US Class Current: 165/267
• 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 comfortable although the temperature within the building drifts because the rate of drift is controlled to a gradual and normally unnoticed change.

Claims

1. A demand responsive process for controlled heating and cooling of an occupied area of a building for human habitation, said process comprising:

(a) selectively activating a desired initial comfort temperature setting for said occupied area via a random and non-repeating operator input command;

(b) sensing said temperature of said occupied area and providing an output signal functionally related to said temperature within said occupied area;

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

(d) thereafter automatically altering said desired temperature setting as a function of time and 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;

(e) automatically activating said heating and/or cooling units in response to said output signal and said altered temperature setting to maintain space temperature at approximately said altered temperature setting during at least said second period of time;

(f) thereafter repeatedly activating a selected comfort temperature setting for said occupied area via additional random and non-repeating operator input commands;

(g) automatically activating said heating and/or cooling units in response to said output signal and said selected comfort temperature setting to maintain said temperature at approximately said selected comfort temperature setting during at least a predetermined third period of time;

(h) thereafter automatically altering said selected comfort temperature setting as a function of time and in an energy conserving direction at a predetermined temperature ramp rate equal to or less than approximately 1°

F. per hour;

(i) automatically activating said heating and/or cooling units in response to said output signal and said altered selected temperature setting to maintain said temperature at approximately said altered selected temperature setting; and

(j) automatically prohibiting alteration of said desired temperature setting and said selected temperature setting beyond a desired final comfort temperature setting.

2. The process as defined in claim 1, wherein said operator input command occurs substantially simultaneously with said activation of said selected comfort temperature setting.

3. The process as defined in claim 1, wherein said desired temperature setting is altered during said second period of time in accordance with pre-programmed commands.

4. The process as defined in claim 1, wherein said first period of time is one-half hour or more.

5. The process as defined in claim 1, wherein said first period of time is selectively adjustable by occupants within said building.

6. The process as defined in claim 1, wherein said first period of time commences when said temperature reaches said desired initial comfort temperature setting.

7. The process as defined in claim 1, wherein said first period of time commences when heating and/or cooling units are activated.

8. The process as defined in claim 1, wherein said output signal is functionally related to dry bulb temperature, ambient room temperature, and air velocity within said occupied area.

9. 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 for providing an output signal functionally related to temperature within said occupied building;

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;

reset means for automatically resetting said temperature setting at said initial comfort temperature setting in response to randomly timed operator input commands;

said setting change means automatically changing said reset temperature setting in an energy conserving direction and at a selected ramp rate of no more than approximately 1°

F. per hour;

limit means for limiting changing of 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 output signal and said temperature settings.

10. The apparatus as defined in claim 9, further comprising:

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

11. The apparatus as defined in claim 10, further comprising:

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

12. The apparatus as defined in claim 11, wherein said first period of time is one-half hour or more.

13. The apparatus as defined in claim 9, further comprising:

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

14. The apparatus as defined in claim 10, wherein said first period of time commences when said space temperature reaches said desired initial comfort temperature setting.

15. The apparatus as defined in claim 11, wherein said temperature setting means is activated by random and non-repeating operator input commands.

16. A process for automatically altering space temperature of an inhabited space operatively connected to heating and/or cooling means, said process comprising:

activating an initial comfort temperature setting by a random and non-repeating operator command;

continually sensing said space temperature and providing an output functionally related thereto for activating said heating and/or cooling means to obtain said space temperature at approximately said initial comfort temperature setting;

thereafter automatically altering said initial comfort temperature setting as a function of time and in an energy conserving direction during a first period of time having a duration of at least several hours while activating said heating and/or cooling means to maintain said space temperature at approximately said altered temperature setting;

thereafter repeatedly reactivating said same or another desired comfort temperature setting by additional random and non-repeating operator input commands;

thereafter automatically altering said same or another comfort temperature setting as a function of time and in an energy conserving direction during additional periods of time each having the duration of at least several hours while activating said heating and/or said cooling means to maintain said space temperature at approximately said altered same or another comfort temperature setting; and

automatically prohibiting alteration of said same or another comfort temperature setting beyond a desired final comfort temperature setting.

17. A process as defined in claim 16, wherein said first period of time is selectively adjustable by occupants within said building.

18. A process as defined in claim 17, wherein said space temperature is maintained at approximately said initial comfort temperature setting for a time period exceeding one-half hour.

19. A process as defined in claim 18, wherein said time period is selectively adjustable by occupants within said building.

20. A process as defined in claim 16, wherein said output is functionally related to dry bulb temperature, ambient mean temperature, and air velocity.