Individual workspace environmental control

• US 5,725,148 A
• Filed: 01/16/1996
• Issued: 03/10/1998
• Est. Priority Date: 01/16/1996
• Status: Expired due to Term

• Current Assignee: Thomas B. Hartman
• Original Assignee: Thomas B. Hartman
• Inventors: Hartman, Thomas B.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US08/586,337
• Time in Patent Office: 784 Days
• Field of Search: 236/49.3, 236/51, 236/47, 454/258, 454/286, 454/333, 165/217, 165/212, 219/201
• US Class Current: 236/49.3
• CPC Class Codes: F24F 1/00075 receiving air from a central station
• CPC Class Codes: F24F 11/56 Remote control
• CPC Class Codes: F24F 2003/003 with primary air treatment in the central station and subsequent secondary air treatment in air treatment units located in or near the rooms
• CPC Class Codes: F24F 3/044 Systems in which all treatment is given in the central station, i.e. all-air systems

Abstract

In building environmental control, primary HVAC services are supplemented to improve individual user comfort by automatically adjusting lighting levels and airflow direction mix in the individual workspace. An individual terminal unit provides these individualized supplemental services without affecting loading on the primary HVAC system. Multiple individual terminal units disposed in an open, common area communicate with one another and adjust operations in response to neighborhood conditions to improve overall system efficiency and save energy while optimizing individual user comfort.

Claims

1. A method of improving comfort for a user occupying a substantially closed individual workspace within a building, the building further including a primary supply of conditioned air available to the workspace, and the method comprising the steps of:

determining a cooling setpoint temperature for the workspace;

selecting a cooling threshold temperature for the workspace greater than the cooling setpoint temperature for the workspace;

monitoring the workspace so as to detect occupancy of the workspace;

monitoring a temperature of the workspace;

if occupancy of the workspace is detected and the workspace temperature exceeds the setpoint temperature, providing conditioned air from the primary supply into the workspace to cool the workspace; and

while occupancy of the workspace is detected and the workspace temperature exceeds the cooling threshold temperature, additionally and automatically providing supplemental comfort services so as to improve comfort for the user without directly affecting load on the building primary supply.

2. A method according to claim 1 wherein the building includes means for adjusting a lighting level within the individual workspace and said step of providing supplemental comfort services includes automatically lowering the lighting level within the individual workspace as long as the individual workspace temperature exceeds the cooling threshold temperature.

3. A method according to claim 2 wherein the step of lowering the lighting level comprises lowering the lighting level in dependence upon the workspace temperature according to a predetermined operating curve.

4. A method according to claim 2 further comprising limiting said step of lowering the lighting level so as to maintain at least a predetermined minimum lighting level in the individual workspace as long as occupancy of the workspace is detected.

5. A method according to claim 2 further comprising:

receiving a manual adjustment of the workspace lighting level;

in response to the manual adjustment of the workspace lighting level, discontinuing said automatic adjustment of the lighting level until the workspace temperature reaches the cooling setpoint; and

in response to the workspace temperature reaching the cooling setpoint, resuming said automatic adjustment of the lighting level whereby the user can manually control operation of the supplemental comfort services.

6. A method according to claim 2 wherein said cooling threshold temperature is selected as approximately one degree F. above the workspace cooling setpoint temperature.

7. A method of controlling the environment in a substantially closed individual workspace within a building, the building including a primary supply of conditioned air available to the workspace, and the method comprising the steps of:

determining a cooling setpoint temperature for the workspace;

defining a cooling threshold temperature for the workspace greater than the cooling setpoint temperature for the workspace;

monitoring the workspace so as to detect occupancy of the workspace;

monitoring a temperature in the workspace;

while occupancy of the workspace is detected and the workspace temperature exceeds the cooling threshold temperature, automatically adjusting a direction mix of the conditioned airflow into the workspace toward a downward airflow direction so as to provide airflow cooling to an occupant of the workspace.

8. A method according to claim 7 further comprising:

determining a temperature increment defined as an amount by which the workspace temperature exceeds the threshold temperature; and

wherein

said adjusting the airflow direction mix includes adjusting the airflow direction mix as a function of the determined temperature increment.

9. A method according to claim 7 and further comprising the steps of:

if the airflow direction mix is adjusted manually by a user, discontinuing said automatic adjustment of the airflow direction mix until the individual workspace temperature reaches the cooling setpoint; and

when the workspace temperature reaches the cooling setpoint, resuming said automatically adjusting the airflow direction mix responsive to the workspace temperature.

10. A method according to claim 7 further comprising limiting said adjusting the airflow direction mix so as to maintain the airflow direction mix within predetermined limits notwithstanding changes in the workspace temperature.

11. A method according to claim 7 further comprising, if occupancy of the workspace is detected and the workspace temperature exceeds the cooling threshold temperature, reducing a lighting level in the workspace.

12. A method according to claim 7 further comprising, while occupancy of the workspace is not detected and the workspace temperature exceeds the cooling threshold temperature, automatically adjusting the conditioned airflow direction mix to a substantially downward airflow direction, thereby improving effectiveness of primary air delivery into the workspace while occupancy is not detected.

13. A method of controlling the environment in a substantially closed workspace within a building, the building including a primary supply of conditioned air available to the workspace, and the method comprising the steps of:

determining a heating setpoint temperature for the workspace;

defining a heating threshold temperature lower than the heating setpoint temperature for the workspace;

monitoring the workspace so as to detect occupancy of the workspace;

monitoring a temperature of the workspace; and

while occupancy of the workspace is detected and the workspace temperature is below the heating threshold temperature, automatically providing at least one supplemental comfort service so as to improve user comfort without substantially affecting load on the building primary supply system.

14. A method according to claim 13 wherein the building includes means for adjusting a lighting level within the workspace and said step of providing supplemental comfort services includes automatically raising the workspace lighting level as long as the workspace temperature is below the heating threshold temperature.

15. A method according to claim 14 wherein the step of raising the lighting level comprises raising the lighting level as a function of an amount by which the workspace temperature is below the heating threshold temperature.

16. A method according to claim 14 further comprising limiting said raising the lighting level so as to maintain the lighting level within a predetermined maximum lighting level notwithstanding changes in the workspace temperature.

17. A method according to claim 14:

further comprising, in response to a manual adjustment of the workspace lighting level, discontinuing said automatic adjustment of the lighting level until the workspace temperature reaches the heating setpoint; and

then,

in response to the workspace temperature reaching the heating setpoint, resuming said automatic adjustment of the lighting level whereby the user can manually override operation of the lighting level adjustment.

18. A method according to claim 14 wherein said heating threshold temperature is selected as approximately one degree F. below the workspace heating setpoint temperature.

19. A method of improving comfort for a user occupying a substantially closed workspace within a building comprising the steps of:

determining a heating setpoint temperature for the workspace;

defining a heating threshold temperature for the workspace lower than the heating setpoint temperature for the workspace;

monitoring the workspace so as to detect occupancy of the workspace;

monitoring a temperature of the workspace;

while occupancy of the workspace is detected and the workspace temperature is below the heating setpoint temperature, directing heated airflow into the workspace to warm the workspace; and

while occupancy of the workspace is detected and the workspace temperature is below the heating threshold temperature, automatically adjusting an airflow direction mix of the heated airflow into the workspace so as to increase a percentage of indirect airflow, thereby directing the flow of heated air along a generally horizontal direction so as to minimize drafts in the workspace.

20. A method according to claim 19 further comprising, while occupancy of the workspace is not detected and the workspace temperature is below the heating threshold temperature, automatically adjusting the conditioned airflow direction mix to a substantially downward airflow direction, thereby improving effectiveness of primary air delivery into the workspace while occupancy is not detected.

21. A method according to claim 19 further comprising limiting said adjusting the airflow direction mix so as to maintain the airflow direction mix within predetermined directional limits notwithstanding changes in the workspace temperature.

22. A method according to claim 19 further comprising, in response to a manual adjustment of the heated airflow direction mix, discontinuing said automatic adjustment of the airflow direction mix until the workspace temperature reaches the heating setpoint;

and then,

in response to the workspace temperature reaching the heating setpoint, resuming said automatic adjustment of the airflow direction mix whereby the user can manually override the automatic airflow direction mix adjustment.

23. A method according to claim 19 further comprising, if occupancy of the workspace is detected and the workspace temperature is below the heating threshold temperature, automatically increasing a lighting level in the workspace.

24. A method according to claim 19 wherein the step of adjusting the airflow direction mix comprises adjusting the airflow direction mix as a predetermined function of the amount by which the workspace temperature is below the heating threshold temperature.

25. A method according to claim 24 wherein said adjusting the airflow direction mix comprises increasing a percentage of indirect airflow by approximately 2.5 percent for each 0.1 degree F. difference between the workspace temperature and the heating threshold temperature, so that the airflow direction mix will be approximately 25 percent more indirect than the indirect airflow setpoint mix when the workspace temperature is one degree below the heating threshold temperature.

26. A method of delivering primary air into a space comprising the steps of:

monitoring occupancy of the space;

providing a diffuser mounted in the ceiling of the space, the diffuser comprising an inlet duct for receiving a supply of primary air,

a first outlet port for directing air from the inlet duct into the space along a generally horizontal direction,

a second outlet port for directing air from the inlet duct into the space along a generally downward direction, and

adjustable relating means for providing a first portion of the primary air from the inlet duct into the first outlet port and a second portion of the primary air from the inlet duct into the second outlet port, so as to provide an adjustable airflow direction mix of horizontal and downward primary airflow into the space;

providing a supply of primary air to the diffuser inlet duct;

when occupancy of the space is detected, setting the diffuser regulating means to a first predetermined setting so as to provide a first mix of horizontal and downward flow of the primary air into the space; and

when occupancy of the space is not detected, setting the diffuser regulating means to a second predetermined setting so as to provide a second mix of horizontal and downward flow of the primary air into the space, the second mix having a greater proportion of downward airflow than the first mix, thereby improving effectiveness of primary air delivery into the space while occupancy is not detected.

27. A method according to claim 26 wherein the second diffuser setting directs substantially all of the primary air into the space in a substantially downward direction, thereby maximizing effectiveness of primary air delivery.

28. An individual terminal unit for connection to a primary supply of conditioned air in a variable air volume heating and cooling system to serve a zone of a building in which the individual terminal unit is installed, comprising:

inlet means for connection to the primary air supply to receive conditioned air flow;

a temperature sensor for providing an indication of a space temperature;

input means for receiving an indication of a zone temperature setpoint settable by a user;

an adjustable relating vane for controlling an airflow direction mix of conditioned airflow out of the terminal unit and into the zone;

an electronic controller coupled to the temperature sensor, the input means and to the regulating vane for controlling the regulating vane and thereby adjusting the airflow direction mix in dependence upon the indicated zone temperature and the zone temperature setpoint;

means in the electronic controller for configuring the terminal unit as a group member terminal unit for use in an enclosed zone in the building together with at least one other group member terminal unit; and

communication means for coordinating operation of the terminal unit with said at least one other group member terminal unit; and

a memory for storing addresses uniquely identifying said at least one other terminal unit as a member of the same group of terminal units.

29. A variable air volume environmental conditioning system comprising:

a primary supply of conditioned air;

a plurality of individual terminal units each coupled to the primary air supply, and each of said terminal units designated as a member of a selected group of terminal units;

means in at least one group member terminal unit for detecting occupancy in a corresponding workspace area adjacent the group member terminal unit;

means for communicating to all of the group member terminal units an indication that occupancy is detected in the corresponding workspace area adjacent said at least one group member terminal unit; and

means in each group member terminal unit for operating in an occupied mode of operation in response to the said indication that occupancy is detected in said at least one of the workspace areas.

30. A variable air volume environmental conditioning system according to claim 29 and further comprising:

means for receiving a manual adjustment of supplemental services;

means for communicating an indication of the manual adjustment to the other group member terminal units; and

means in each group member terminal unit for adjusting supplemental services setpoints in response to the said indication of the manual adjustment.

31. A variable air volume environmental conditioning system according to claim 29 and further comprising:

means in at least one group member terminal unit for sensing temperature in a workspace area adjacent the terminal unit; and

means for communicating to all of the group member terminal units an indication of the workspace temperature in the corresponding workspace area adjacent said at least one group member terminal unit.

32. A variable air volume environmental conditioning system according to claim 29 and wherein a plurality of the group member terminal units include respective means for sensing temperature in their respective workspaces;

and further comprising;

means for mathematically combining the respective workspace temperatures sensed by said plurality of the group member terminal units so as to form a group average workspace temperature;

means for communicating to all of the group member terminal units an indication of the said group average workspace temperature; and

means in at least one of the group members for comparing the group average workspace temperature to a predetermined temperature setpoint in connection with providing environmental control services.

33. An individual terminal unit for connection to a primary supply of conditioned air in a variable air volume heating and cooling system to serve a zone of a building in which the individual terminal unit is installed, comprising:

inlet means for connection to the primary air supply to receive conditioned air flow;

a temperature sensor for providing an indication of a space temperature;

input means for receiving an indication of a zone temperature setpoint settable by a user;

an adjustable regulating vane for controlling an airflow direction mix of conditioned airflow out of the terminal unit and into the zone;

an electronic controller coupled to the temperature sensor, the input means and to the regulating vane for controlling the regulating vane and thereby adjusting the airflow direction mix in dependence upon the indicated zone temperature and the zone temperature setpoint;

means in the electronic controller for configuring the terminal unit as a neighborhood terminal unit for use in an open zone in the building together with at least one other neighborhood terminal unit;

communication means for coordinating operation of the terminal unit with said at least one other neighborhood terminal unit; and

a memory for storing addresses uniquely identifying said at least one other terminal unit as a member of the neighborhood.

34. An individual terminal unit for connection to a primary supply of conditioned air in a variable air volume heating and cooling system to serve a zone of a building in which the individual terminal unit is installed, comprising:

inlet means for connection to the primary air supply to receive conditioned air flow;

a temperature sensor for providing an indication of a space temperature;

input means for receiving an indication of a zone temperature setpoint settable by a user;

an adjustable regulating vane for controlling an airflow direction mix of conditioned airflow out of the terminal unit and into the zone;

an electronic controller coupled to the temperature sensor, the input means and to the regulating vane for controlling the regulating vane and thereby adjusting the airflow direction mix in dependence upon the indicated zone temperature and the zone temperature setpoint;

wherein the electronic controller includes means for interfacing to a light source in the zone for adjusting light level in the zone in response to the zone temperature indicated by the temperature sensor and the indicated zone temperature setpoint.

35. A method according to claim 34 further comprising:

selecting a heating setpoint temperature for the job unit workspace;

in the job unit, selecting a heating threshold temperature lower than the heating setpoint temperature for controlling supplemental heating services in the job unit; and

adjusting the heating threshold temperature for the job unit in response to the weighted average deviation of the other neighborhood terminal units;

limiting the heating threshold temperature to within a range bounded by the initial heating threshold temperature and the heating setpoint temperature.

36. A method of operation of a VAV system having a plurality of terminal units each installed within a common area, and each of the terminal units serving a corresponding workspace within the common area, the method comprising:

defining one of the terminal units as a job unit;

selecting a cooling setpoint temperature for the job unit workspace;

in the job unit, selecting an initial cooling threshold temperature greater than the cooling setpoint temperature for controlling supplemental cooling services in the job unit;

in the job unit, selecting a plurality of the other terminal units for operation as neighborhood terminal units;

in the job unit, collecting operating data from the other neighborhood terminal units;

determining a weighted average deviation responsive to the collected data;

adjusting the cooling threshold temperature for the job unit in response to the weighted average deviation of the other neighborhood terminal units; and

limiting the cooling threshold temperature to within a range bounded by the initial cooling threshold temperature and the cooling setpoint temperature.

37. A method of controlling the environment in a substantially closed workspace within a building, the building including a primary supply of conditioned air available to the workspace, and the method comprising the steps of:

determining a heating setpoint temperature for the workspace;

defining a heating threshold temperature lower than the heating setpoint temperature for the workspace;

providing a radiant heat source within the workspace;

monitoring the workspace so as to detect occupancy of the workspace;

monitoring a temperature of the workspace; and

while occupancy of the workspace is detected and the workspace temperature is below the heating threshold temperature, automatically activating the radiant heating source for radiating heat into the workspace thereby improving user comfort without directly affecting load on the building primary supply.