Method and system for improved-efficiency air-conditioning

• US 8,491,710 B2
• Filed: 04/05/2012
• Issued: 07/23/2013
• Est. Priority Date: 05/17/2010
• Status: Active Grant

• Current Assignee: Enverid Systems, Inc.
• Original Assignee: Enverid Systems, Inc.
• Inventors: Meirav, Udi
• Primary Examiner(s): Hopkins, Robert A
• Application Number:
  US13/440,356
• Publication Number:
  US 20120273980A1
• Time in Patent Office: 474 Days
• Field of Search: 961/30, 96/11, 961/09, 961/43, 96/96, 961/14, 961/39
• US Class Current: 96/109
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2258/06 Polluted air
• CPC Class Codes: B01D 53/02 by adsorption, e.g. preparative gas chromatography solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01
• CPC Class Codes: B01D 53/0462 Temperature swing adsorption
• CPC Class Codes: B01D 53/047 Pressure swing adsorption
• CPC Class Codes: B01D 53/14 by absorption
• CPC Class Codes: F24F 2011/0002 for admittance of outside air
• CPC Class Codes: F24F 3/0442 with volume control at a constant temperature
• CPC Class Codes: F24F 8/60 by adding oxygen
• CPC Class Codes: Y02C 20/10 of nitrous oxide (N2O)
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

Systems and methods for circulating air in an enclosed environment are disclosed. In some embodiments, the system includes an inlet to receive air from outside of the enclosed environment and an air handling unit coupled to the inlet and also configured to receive circulated air from the enclosed environment. The air handling unit can be configured to affect a temperature of at least one of the received outside air and the received circulated air. Based on the received outside air and the received circulated air, the air handling unit can be further configured to generate air for supplying to the enclosed environment.

Claims

1. A system for circulating and treating air of an enclosed environment, comprising:

an inlet configured to receive air from outside of the enclosed environment;

an air handling unit configured to receive air from at least the enclosed environment and supply air into the enclosed environment;

at least one sensor configured to provide a signal determinative of a level of at least one gaseous contaminate contained in the air of the enclosed environment to the control system,

and

a scrubbing system in gaseous communication with the air handling unit which includes at least one adsorbent,

wherein the scrubbing system is configured to reduce the concentration of at least one gaseous contaminant in the air the enclosed environment by adsorption thereof by the adsorbent.

2. The system according to claim 1, wherein the scrubbing system is configured to intercept at least a portion of the air from the enclosed environment prior to it reaching the air handling unit and/or after it is processed by the air handling unit.

3. The system according to claim 1, wherein a first volume of air comprising between about 1% to about 50% of the air received from the enclosed environment by the system is diverted to the scrubbing system and a remainder of the first volume of air is configured to bypass the scrubbing system, and wherein the air supplied to the enclosed environment comprises at least a portion of the remainder and at least a portion of the scrubbed air.

4. The system according to claim 1, further comprising a control system in communication with at least one sensor configured to provide a signal determinative of a level of the at least one gaseous contaminant of the air of the enclosed environment to the control system, wherein based on the determination, the control system is configured to control at least one of the scrubbing system and the air inlet.

5. The system of claim 4, wherein the control system is further configured to maintain a desired level of the contaminant for the air of the enclosed environment.

6. The system according to claim 1, wherein the scrubbing system comprises a plurality of beds, wherein each bed is configured to intercept portion of the flow of air for scrubbing.

7. The system according to claim 1, wherein the scrubbing system comprises a system for controlling a process of capture and release of carbon dioxide, and wherein the process includes at least one of the following:

(i) a reaction between an alkaline salt and carbon dioxide, and (ii) a reaction between amine molecules and carbon dioxide.

8. The system according to claim 1, wherein the scrubbing system utilizes one or more alkaline salts.

9. The system according to claim 1, wherein the scrubbing system is used repeatedly through a temperature swing adsorption cycle or a concentration swing adsorption cycle or a pressure swing adsorption cycle or a combination thereof.

10. The system according to claim 1, wherein the scrubbing system is configured to receive at least a first part of the volume of the air from the enclosed environment and at least a second part of the volume of the air from the enclosed environment is configured to bypass the scrubbing system.

11. The system according to claim 10, wherein after scrubbing, the first part of the volume of air is combined with at least a portion of the second part of the volume of air which bypassed the scrubbing system and together are supplied to the enclosed environment.

12. The system according to claim 1, further comprising:

a sensor for determining a level of the at least one gaseous contaminant in the air of the enclosed environment; and

a controller configured to modify a rate of intake of outside air or intake of air from the enclosed environment into the scrubber according to the level of the at least one gaseous contaminant in the air of the enclosed environment.

13. The system according to claim 1, further comprising an exhaust duct, wherein at least a portion of the air from the enclosed environment is exhausted outside.

14. The system according to claim 1, wherein the system is configured such that the scrubbing system may scrub air only from the enclosed environment.

15. The system of claim 1, wherein the scrubbing system includes a purge cycle during which a purge substance is applied to the adsorbent to release at least part of the gaseous contaminant previously adsorbed by the adsorbent, and the purge substance includes a gas.

16. The system according to claim 15, wherein the purge substance is heated by at least one of the following:

an application of heat generated by a component of a heating, ventilation and air-conditioning system, and

a heating system configured to heat the purge substance or the sorbent itself.

17. The system of claim 1, wherein the system is configured to supply a mix of at least two of:

a volume of air received from the enclosed environment that has been scrubbed, a volume of unscrubbed air received from the enclosed environment, and a volume of air from the inlet.

18. A system for circulating and treating air of an enclosed environment, comprising:

an inlet configured to receive air from outside of the enclosed environment;

an air handling unit configured to receive air from the enclosed environment and supply air into the enclosed environment;

a scrubbing system in gaseous communication with the air handling unit which includes at least one adsorbent;

a control system in communication with at least one sensor, the sensor being configured to provide a signal determinative of a level of at least one gaseous contaminate contained in the air of the enclosed environment to the control system,

wherein based on the level of the gaseous contaminate, the control system is configured to control at least one of the scrubbing system, the air handling unit, and the air inlet; and

wherein the scrubbing system is configured to reduce the concentration of at least one gaseous contaminant in the air of the enclosed environment by adsorption thereof by the adsorbent.

19. A system for circulating and treating air of an enclosed environment, comprising

an inlet configured to receive air from outside of the enclosed environment;

an air handling unit configured to receive at least air from the enclosed environment and supply air into the enclosed environment;

a scrubbing system in gaseous communication with the air handling unit, the scrubbing system including at least one adsorbent, wherein;

the scrubbing system is configured to receive and scrub at least a first part of the volume of the air from the enclosed environment and at least a second part of the volume of the air from the enclosed environment is configured to bypass the scrubbing system, and

the scrubbing system is configured to reduce the concentration of at least one gaseous contaminant in the air of the enclosed environment by adsorption thereof by the adsorbent.