Systems and methods for providing optimal light-CO2 combinations for plant production

• US 7,184,846 B2
• Filed: 10/29/2004
• Issued: 02/27/2007
• Est. Priority Date: 10/31/2003
• Status: Expired due to Fees

• Current Assignee: Cornell Research Foundation Incorporated (Cornell University)
• Original Assignee: Cornell Research Foundation Incorporated (Cornell University)
• Inventors: Ho, Jeffrey W., Ferentinos, Konstantinos, de Villiers, David S., Seginer, Ido, Albright, Louis D.
• Primary Examiner(s): Knight; Anthony
• Assistant Examiner(s): Chang; Sunray
• Application Number:
  US10/976,958
• Publication Number:
  US 20050252078A1
• Time in Patent Office: 851 Days
• Field of Search: 700/36, 700/99, 700/306, 405/37
• US Class Current: 700/36
• CPC Class Codes: A01G 7/02 Treatment of plants with carbon dioxide
• CPC Class Codes: A01G 9/18 Greenhouses for treating plants with carbon dioxide or the like
• CPC Class Codes: G05B 13/042 in which a parameter or coefficient is automatically adjusted to optimise the performance
• CPC Class Codes: G05B 15/02 electric

Abstract

Method and system for optimizing plant production in a cost effective manner. System (100) includes a processor (102) in communication with resource controllers (110, 112) for controlling resources (106, 108) such as, for example, lighting and carbon dioxide. Each resource has a cost that varies temporally or with other factors. The processor implements an algorithm that receives a desired plant production rate and other input, such as operating conditions of the system and environment, and determines amounts of each resource to expend consistent with plant production goals and resource costs.

Claims

1. A computerized control system using data input and output, the control system comprising:

a processor;

a first resource controller operable to control a first resource, said first resource having a first cost, wherein the first cost varies depending on a resource cost time period; and

a second resource controller operable to control a second resource, said second resource having a second cost;

wherein the processor is operable to;

receive a desired plant production rate, said desired plant production rate related to a first resource and a second resource;

receive a first cost associated with the first resource, wherein the first cost varies in accordance with a resource cost time period;

receive a second cost associated with the second resource; and

determine based on the resource time period an amount of the first resource to expend during the time period and an amount of the second resource to expend during the time period.

2. The control system of claim 1, wherein the first resource comprises electricity for a lighting system.

3. The control system of claim 1, wherein the second resource comprises carbon dioxide (CO₂).

4. The control system of claim 1, wherein the processor is operable to select the resource cost time period from the group consisting of a peak period and a non-peak period.

5. The control system of claim 1, wherein the processor is further operable to re-determine the amount of the first resource to expend and the amount of the second resource to expend upon a change to a differing resource cost time period.

6. The control system of claim 1, wherein the processor is further operable to periodically re-determine the amount of the first resource to expend and the amount of the second resource to expend at a plurality of time intervals.

7. The control system of claim 6, wherein the processor is further operable to calculate a proportional plant growth achieved.

8. The control system of claim 7, wherein the re-determined amounts of the first resource to expend and the amount of the second resource to expend are based at least in part on the calculated proportional growth achieved.

9. The control system of claim 1, wherein the first resource controller is operable to supplement a naturally available resource.

10. The control system of claim 9, wherein:

the naturally available resource varies in accordance with a natural resource time period; and

the processor is operable to determine the amount of the first resource to expend and the amount of the second resource to expend based at least in part on the natural resource time period and the resource cost time period.

11. The control system of claim 10, wherein the natural resource is solar radiation and the natural resource time period is selected from the group consisting of daytime and nighttime.

12. The control system of claim 1, wherein:

the second resource comprises CO2; and

the second resource controller is operable to supplement CO2 decay losses.

13. The control system of claim 1, wherein the processor is operable to predict for an upcoming time interval at least one of the environmental conditions selected from the group consisting of air temperature outside of a greenhouse containing the plant, solar insolation, and ventilation rate from a greenhouse encompassing the plant.

14. The control system of claim 1, wherein the resource controllers are operable to adjusting the amounts of the first resource and the second resource respectively to amounts determined by the processor.

15. The control system of claim 1, wherein the processor is operable to determine amounts of the first resource and the second resource to be expended that substantially achieve the desired plant production rate at or near a minimum total cost of the respective resources.