Advanced starting control for multiple zone system

• US 6,453,993 B1
• Filed: 05/17/2000
• Issued: 09/24/2002
• Est. Priority Date: 05/17/2000
• Status: Expired due to Term

• Current Assignee: Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Carrier Corporation (Carrier Global Corporation)
• Inventors: Bujak, Walter E. Jr.
• Primary Examiner(s): CIRIC, LJILJANA V
• Application Number:
  US09/572,899
• Time in Patent Office: 860 Days
• Field of Search: 165/205, 165/208, 165/209, 165/218, 165/219, 165/220, 165/221, 165/238, 165/239, 165/236, 165/200, 165/201, 237/2.R, 237/2.B, 621/32, 62/56, 621/15, 621/766, 621/961, 621/97, 621/58, 621/73, 621/75, 364/148, 700/8, 700/17
• US Class Current: 165/208
• CPC Class Codes: F24F 11/54 using one central controller connected to several sub-controllers
• CPC Class Codes: F24F 11/83 by controlling the supply of heat-exchange fluids to heat-exchangers
• CPC Class Codes: F24F 11/84 using valves
• CPC Class Codes: F24F 2221/54 Heating and cooling, simultaneously or alternatively
• CPC Class Codes: F24F 3/06 characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
• CPC Class Codes: G05D 23/1934 each space being provided with one sensor acting on one or more control means

Abstract

A system for controlling delivery of either heated or cooled water to a plurality of heat exchangers includes a system controller which gathers information as to the current and future heating or cooling demands of a plurality of zone controllers associated with the plurality of heat exchangers. The system controller analyzes current demands for heating or cooling in combination with future demands for heating or cooling to determine if there is any combination of current and future heating or cooling demands that exceed a minimum level or number of demands necessary to authorize heating or cooling. A start time for the provision of the heated or cooled water is thereafter determined by the system controller in the event that there is any combination of current and future heating or cooling demands that exceed the minimum level or number of demands necessary to authorize a heating or cooling.

Claims

1. A control system for controlling a heating source capable of heating water to be delivered to a plurality of heat exchangers and for controlling a cooling source capable of cooling water to be delivered to the plurality of heat exchangers, said control system comprising:

a plurality of zone controllers, each zone controller connected to a respective heat exchanger so as to control delivery of water from the heating or cooling sources to the respective heat exchanger, each zone controller being operative to generate information concerning either a demand for heating or a demand for cooling as well as information concerning any next to occur future demand for heating or cooling;

a system controller in communication with each of said zone controllers, said system controller being operative to periodically receive information concerning each zone controller'"'"'s current demand for heating or cooling as well as information concerning each zone controller'"'"'s next-to-occur future demand for heating or cooling, said system controller being furthermore operative to periodically determine whether there is a sufficient predominance of current heating demands being received from said zone controllers so as to timely activate the heating source or whether there is a sufficient predominance of current cooling demands from said zone controllers so as to timely activate the cooling source, said system controller being furthermore operative to determine whether there is a sufficient predominance of current and future heating demands so as to timely activate the heating source or whether there is a sufficient predominance of current and future cooling demands so as to timely activate said cooling source in the event that there is not a sufficient predominance of current heating or cooling demands from said zone controllers.

2. The control system of claim 1 wherein said system controller is furthermore operative to store the periodically received information concerning each zone controller'"'"'s current demand for heating or cooling and the information concerning each zone controller'"'"'s next-to-occur future demand for heating or cooling.

3. The control system of claim 2 wherein said system controller is furthermore operative to compute and store certain parameters relating to future cooling or heating demands by the zone controllers, said parameters including a computed heat start time or a computed cool start time for any zone controller not having a present heating or cooling demand.

4. The control system of claim 3 wherein the information stored concerning each zone controller'"'"'s next to occur future demands for heating or cooling includes the next future set point and the associated start time for the next future setpoint for each zone controller, and a currently sensed temperature for the zone associated with the zone controller;

and wherein any heat start time computed by said system controller is computed as a function of the difference between next future setpoint for the zone controller and the currently sensed temperature for the zone controller, said difference being multiplied by a heating factor for that zone controller, the heating factor defining the amount of time necessary to raise the sensed temperature in the respective zone associated with the zone controller by one degree; and

wherein any cool start time computed by said system controller is computed as a function of the difference between the currently sensed temperature for the zone controller and the next future setpoint for the zone controller, said difference being multiplied by a cooling factor for that zone controller, the cooling factor defining the amount of time necessary to lower the sensed temperature in the respective zone associated with the zone controller by one degree.

5. The control system of claim 3 wherein said system controller is operative to determine the number of current heat and future heat demands by adding the number of current heat demands produced by the zone controllers to the number of computed heat start times and wherein said system controller is operative to determine the current cooling demands and future cooling demands by adding the number of current cooling demands produced by the zone controllers to the number of computed cool start times.

6. The control system of claim 5 wherein said system controller is operative to determine whether there is a sufficient predominance of current heating and future heating demands by comparing the number of current heating demands and the number of future heating demands with a minimum acceptable level of heating demands and wherein said system controller is operative to determine whether there is a sufficient predominance of current cooling and future cooling demands by comparing the number of current cooling demands and the number of future cooling demands with a minimum acceptable level of cooling demands.

7. The control system of claim 6 wherein said system controller is furthermore operative to compute a start time for providing heated water to any heat exchanger associated with a zone controller having a current or future heating demand when there is a sufficient predominance of current heating and future heating demands and wherein said system controller is operative to compute a start time for providing cooled water to any heat exchanger associated with a zone controller having a current cooling or future cooling demand when there is a sufficient predominance of current cooling demands and future computed cooling demands.

8. The control system of claim 7 wherein said system controller is operative to determine a start time for providing heated water by determining the number of current heat demands in the stored information, determining the number of computed heat start times that need to be counted and combined with the number of current heat demands in the stored information in order to exceed a minimum number of zone controllers necessary to be demanding current or future heating and successively selecting the next to occur computed heat start time until the determined number of computed heat start times have been counted and selecting the last counted next to occur computed heat start time as the start time for providing heated water and wherein said system controller is operative to determine a start time for providing cooled water by determining the number of current cooling demands in the stored information, determining the number of computed cool start times that need to be counted and combined with the number of current cooling demands in the stored information in order to exceed a minimum number of zone controllers necessary to be demanding current or future cooling and successively selecting the next to occur computed cool start time until the determined number of computed cool start times have been counted and selecting the last counted next to occur computed cool start time as the start time for providing cooled water.

9. The control system of claim 1 wherein the water delivered to the plurality of heat exchangers is returned to the heating or cooling source, said control system further comprising:

a temperature sensor for sensing the temperature of water returning from the heat exchangers before the water is returned back to the heating source or the cooling source; and

wherein said system controller is operative to activate the heating or cooling source only if the sensed temperature of the circulating water is within a predefined temperature range.

10. The control system of claim 1 wherein said system controller is operative to send a message to each of the zone controllers indicating that the heated water or cooled water is to be provided to the heat exchangers based upon future as well as current demands for heating or cooling whereby each of said zone controllers is operative to control the delivery of water to the respective heat exchanger controlled by said zone controller depending on whether the zone controller'"'"'s current or future demands is for heated water, cooled water or no demand for either heated or cooled water.

11. A control system for controlling a heating source capable of heating water to be delivered to a plurality of heat exchangers and for controlling a cooling source capable of cooling water to be delivered to the plurality of heat exchangers, said control system comprising:

a plurality of zone controllers, each zone controller connected to a respective heat exchanger so as to control delivery of water from the heating or cooling sources to the respective heat exchanger, each zone controller being operative to generate information concerning either a demand for heating or a demand for cooling as well as information concerning any next-to-occur future demand for heating or cooling;

a system controller in communication with each of said zone controllers, said system controller including a programmed processor that includes executable logic operative to periodically receive information concerning each zone controller'"'"'s current demand for heating or cooling as well as information concerning each zone controller'"'"'s next-to-occur future demand for heating or cooling, said programmed processor furthermore including executable logic operative to periodically determine whether there is a sufficient predominance of current heating demands being received from said zone controllers so as to timely activate the heating source or whether there is a sufficient predominance of current cooling demands from said zone controllers so as to timely activate the cooling source, said programmed processor furthermore including executable logic operative to determine whether there is a sufficient predominance of current and future heating demands so as to timely activate the heating source or whether there is a sufficient predominance of current and future cooling demands so as to timely activate said cooling source in the event that there is not a sufficient predominance of current heating or cooling demands from said zone controllers.

12. The control system of claim 11 wherein said programmed processor furthermore includes executable logic operative to store the periodically received information concerning each zone controller'"'"'s current demand for heating or cooling and the information concerning each zone controller'"'"'s next-to-occur future demand for heating or cooling in a memory associated with said processor.

13.The control system of claim 12 wherein said programmed processor furthermore includes executable logic operative to compute and store certain parameters relating to future cooling or heating demands by the zone controllers in said memory associated with said processor, said parameters including a computed heat start time or a computed cool start time for any zone controller not having a present heating or cooling demand.

17. The control system of claim 11 wherein said programmed processor includes logic that is operative to determine a start time for providing heated water by determining the number of current heat demands in the stored information, determining the number of computed heat start times that need to be counted and combined with the number of current heat demands in the stored information in order to exceed a minimum number of zone controllers necessary to be demanding current or future heating and successively selecting the next to occur computed heat start time until the determined number of computed heat start times have been counted and selecting the last counted next to occur computed heat start time as the start time for providing heated water and wherein said system controller is operative to determine a start time for providing cooled water by determining the number of current cooling demands in the stored information, determining the number of computed cool start times that need to be counted and combined with the number of current cooling demands in the stored information in order to exceed a minimum number of zone controllers necessary to be demanding current or future cooling and successively selecting the next to occur computed cool start time until the determined number of computed cool start times have been counted and selecting the last counted next to occur computed cool start time as the start time for providing cooled water.

18. The control system of claim 11 wherein the water delivered to the plurality of heat exchangers is returned to the heating or cooling source, said control system further comprising:

a temperature sensor for sensing the temperature of water returning from the heat exchangers before the water is returned back to the heating source or the cooling source; and

wherein said programmed processor includes logic that is operative to activate the heating or cooling source only if the sensed temperature of the circulating water is within a predefined temperature range.

19. The control system of claim 11 wherein said programmed processor includes logic that is operative to send a message to each of the zone controllers indicating that the heated water or cooled water is to be provided to the heat exchangers based upon future as well as current demands for heating or cooling whereby each of said zone controllers is operative to control the delivery of water to the respective heat exchanger controlled by said zone controller depending on whether the zone controller'"'"'s current or future demands is for heated water, cooled water or no demand for either heated or cooled water.

13. The control system of claim 13 wherein the information stored concerning each zone controller'"'"'s next to occur future demands for heating or cooling includes the next future set point and the associated start time for the next future setpoint for each zone controller, and a currently sensed temperature for the zone associated with the zone controller;

and wherein any heat start time computed by said programmed processor is computed as a function of the difference between next future setpoint for the zone controller and the currently sensed temperature for the zone controller, said difference being multiplied by a heating factor for that zone controller stored in the memory associated with said programmed processor, the heating factor defining the amount of time necessary to raise the sensed temperature in the respective zone associated with the zone controller by one degree; and

wherein any cool start time computed by said programmed processor is computed as a function of the difference between the currently sensed temperature for the zone controller and the next future setpoint for the zone controller stored in the memory associated with said programmable processor, said difference being multiplied by a cooling factor for that zone controller, the cooling factor defining the amount of time necessary to lower the sensed temperature in the respective zone associated with the zone controller by one degree.

14. The control system of claim 13 wherein said programmed processor includes executable logic operative to determine the number of current heat and future heat demands by adding the number of current heat demands produced by the zone controllers to the number of computed heat start times and wherein said system controller includes logic that is operative to determine the current cooling demands and future cooling demands by adding the number of current cooling demands produced by the zone controllers to the number of computed cool start times.

15. The control system of claim 15 wherein said programmed processor includes logic that is operative to determine whether there is a sufficient predominance of current heating and future heating demands by comparing the number of current heating demands and the number of future heating demands with a minimum acceptable level of heating demands and wherein said programmed processor includes logic that is operative to determine whether there is a sufficient predominance of current cooling and future cooling demands by comparing the number of current cooling demands and the number of future cooling demands with a minimum acceptable level of cooling demands.

16. The control system of claim 16 wherein said programmed processor furthermore includes logic that is operative to compute a start time for providing heated water to any heat exchanger associated with a zone controller having a current or future heating demand when there is a sufficient predominance of current heating and future heating demands and wherein said programmed processor still furthermore includes logic that is operative to compute a start time for providing cooled water to any heat exchanger associated with a zone controller having a current cooling or future cooling demand when there is a sufficient predominance of current cooling demands and future computed cooling demands.