Load cycling with space temperature feedback

• US 4,136,392 A
• Filed: 10/29/1976
• Issued: 01/23/1979
• Est. Priority Date: 10/29/1976
• Status: Expired due to Term

• Current Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Westphal, Bruce D., Berardi, Jim A.
• Primary Examiner(s): Wise, Edward J.
• Application Number:
  US05/737,244
• Time in Patent Office: 816 Days
• Field of Search: 364/506, 364/443, 364/464, 364/492, 364/493, 364/103, 364/108, 364/418, 364/557, 307/35, 307/39, 307/41, 307/52, 307/62, 324/103, 236/DIG. 8, 165/13, 165/14
• US Class Current: 700/296
• CPC Class Codes: G05D 23/1917 using digital means

Abstract

A system for cycling loads in a building is disclosed having a temperature sensor for sensing a temperature, a processing or computer apparatus for utilizing the sensed temperature to cycle the loads in the building on and off and a memory having a first portion for storing a schedule which contains information relating to the time sequence of the operation for the loads within the building and a second portion for storing a table which contains information related to the operational characteristics of each load covered by the table.

Claims

1. A system for cycling loads in a building comprising:

physical condition responsive means for sensing a physical condition;

memory means having a first group of locations for storing at least one schedule, said schedule containing information relating to a time sequence of operation for at least one load, said memory means having a second group of locations for storing at least one table, said table containing information relating to operational characteristics of each load covered by said table;

processing means connected to said physical condition responsive means and to said memory means for using said information contained in said schedule and table for cycling said loads on and off according to a predetermined cycle rate, each load having an on time and off time within a cycle, said processing means using said physical condition responsive means for resetting said off time; and

,

connecting means connected to said processing means and adapted to be connected to said loads for cycling said loads whereby said off time of said loads are reset by said physical condition responsive means.

2. The system of claim 1 wherein said processing means comprises a programmed computer.

3. The system of claim 1 wherein said first group of locations relating to said at least one schedule contain storage portions for storing at least two cycle rates at which said loads may be cycled.

4. The system of claim 3 wherein said first group of locations of said memory means relating to said at least one schedule contain storage locations to provide a plurality of periods for the operation of said loads whereby said loads may be cycled at either of said two cycle rates or turned on or turned off continuously during any of said periods.

5. The system of claim 1 wherein said physical condition responsive means comprises an inside temperature sensor located within said building for sensing a space temperature and an outside temperature sensor located outside of said building for sensing an outside temperature.

6. The system of claim 5 wherein said second group of locations of said memory means relating to said table comprises storage locations for storing an address of said outside temperature sensor relating to all of the points or loads covered by that table.

7. The system of claim 5 wherein said second group of locations of said memory means relating to said table comprises storage locations for storing maximum and minimum space temperature associated with the loads covered by said table.

8. The system of claim 7 wherein said second group of locations of said memory means relating to said table includes storage locations for storing maximum and minimum off times for the loads covered by said table.

9. The system of claim 8 wherein said second group of locations of said memory means relating to said table comprises storage locations for storing a changeover temperature which determines whether the system is in winter or summer control.

10. The system of claim 9 wherein said processing means comprises means for determining the off time of said loads when said outside temperature is greater than said changeover temperature according to a summer algorithm and for determining the off time for said loads when said outside temperature is less than said changeover temperature according to a winter algorithm.

11. The system of claim 10 wherein said second group of locations of said memory means comprises first storage locations for storing a message which relates to the time remaining until a load covered by said table is turned off and second locations for storing the determined off time.

12. The system according to claim 11 wherein said second group of locations of said memory means comprises storage locations for designating whether the points assigned to the table should have zero off time.

13. The system of claim 12 wherein said maximum and minimum off times of said table establishes a temperature range and wherein said processing means comprises means for setting said second locations for storing said determined off time of tables to zero if the space temperature is not within said range and if said load has been designated as zero off time.

14. The system of claim 13 wherein said first group of locations relating to said at least one schedule contain storage portions for storing at least two cycle rates at which said loads may be cycled.

15. The system of claim 14 wherein said first group of locations of said memory means relating to said at least one schedule contain storage locations to provide a plurality of periods for the operation of said loads whereby said loads may be cycled at either of said two cycle rates or turned on or turned off continuously during any of said periods.

16. The system of claim 1 wherein said second group of locations of said memory means comprises storage locations for storing the schedule to which each point covered by said table is assigned.

17. The system of claim 1 wherein said first group of locations contains first storage locations for storing the length of the present cycle and a second group of storage locations for storing where the schedule is in its present cycle.