Method and system for conditioning air in an enclosed environment with distributed air circulation systems

• US 10,281,168 B2
• Filed: 05/17/2018
• Issued: 05/07/2019
• Est. Priority Date: 11/17/2011
• Status: Active Grant

• Current Assignee: Enverid Systems, Inc.
• Original Assignee: Enverid Systems, Inc.
• Inventors: Meirav, Udi, Biran, Israel, Bechar, Abraham, Meruham, Asael
• Primary Examiner(s): Jones, Christopher P
• Application Number:
  US15/982,797
• Publication Number:
  US 20180266710A1
• Time in Patent Office: 355 Days
• CPC Class Codes: A61L 2209/16 Connections to a HVAC unit
• CPC Class Codes: A61L 9/22 Ionisation
• CPC Class Codes: B01D 2257/11 Noble gases
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 2257/404 Nitrogen oxides other than dinitrogen oxide
• CPC Class Codes: B01D 2257/502 Carbon monoxide
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2257/708 Volatile organic compounds V.O.C.'s
• CPC Class Codes: B01D 2259/40086 by using a purge gas B01D2259/4009 takes precedence
• CPC Class Codes: B01D 2259/4508 for cleaning air in buildings
• CPC Class Codes: B01D 53/0446 Means for feeding or distributing gases
• CPC Class Codes: F24F 1/0326 characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/83 by controlling the supply of heat-exchange fluids to heat-exchangers
• CPC Class Codes: F24F 2110/00 Control inputs relating to air properties
• CPC Class Codes: F24F 2110/50 Air quality properties
• CPC Class Codes: F24F 2120/10 Occupancy
• CPC Class Codes: F24F 2120/20 Feedback from users
• 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: F24F 8/10 by separation, e.g. by filtering
• CPC Class Codes: F24F 8/108 : using dry filter elements
• CPC Class Codes: F24F 8/15 : by chemical means
• CPC Class Codes: F24F 8/192 : by electrical means, e.g. by applying electrostatic fields or high voltages
• CPC Class Codes: F24F 8/20 : by sterilisation
• CPC Class Codes: F24F 8/26 : using ozone
• CPC Class Codes: F24H 3/06 : the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
• CPC Class Codes: F24H 3/062 : using electric energy supply; the heating medium being the resistive element F24H3/08, F24H3/10 takes precedence
• CPC Class Codes: F24H 3/12 : with additional heating arrangements
• CPC Class Codes: F28D 1/04 : with tubular conduits F28D1/0246 takes precedence
• CPC Class Codes: Y02C 20/40 : of CO2

Abstract

A system for conditioning air in a building including a fan-coil unit arranged adjacent to or within an indoor space within the building and additionally configured to at least one of heat and cool the air of the indoor space, and a scrubber arranged adjacent to or within the indoor space, the scrubber configured during a scrub cycle for scrubbing of indoor air from the indoor space. The scrubber includes one or more adsorbent materials arranged therein to adsorb at least one predetermined gas from the indoor air during the scrub cycle, and an exhaust, wherein the scrubber is configured during a purge cycle to direct a purging air over and/or through the adsorbent materials to purge at least a portion of the at least one predetermined gas adsorbed by the adsorbent materials during the scrub cycle from the adsorbent materials and thereafter exhausting the flow via the exhaust.

Claims

1. A system for conditioning air in a building, comprising:

a fan-coil unit arranged adjacent to or within an indoor space within the building and additionally configured to at least one of heat and cool the air of the indoor space; and

a scrubber arranged adjacent to or within the indoor space, the scrubber configured during a scrub cycle to scrub indoor air from the indoor space, the scrubber including;

one or more adsorbent materials arranged therein to adsorb at least one gas from the indoor air during the scrub cycle; and

a source of purging gas,

wherein the scrubber is configured, during a purge cycle, to direct the purging gas over and/or through the one or more adsorbent materials to purge at least a portion of the at least one gas adsorbed by the one or more adsorbent materials during the scrub cycle from the one or more adsorbent materials and thereafter exhaust the purging gas via an exhaust.

2. The system of claim 1, wherein the purging gas includes indoor air from the indoor space.

3. The system of claim 1, wherein flow of indoor air from the indoor space to the scrubber or from the scrubber to the indoor space is ductless.

4. The system of claim 1, wherein the at least one of heating and cooling the air of the indoor space is performed without introducing outdoor air into the indoor space.

5. The system of claim 1, where the at least one gas includes one or more of carbon dioxide, volatile organic compounds, sulfur oxides, radon, nitrous oxides and carbon monoxide.

6. The system of claim 1, wherein the one or more adsorbent materials includes one or more of granular adsorbent particles, solid supported amines, activated carbon, clay, carbon fibers, carbon cloth, silica, alumina, zeolite, synthetic zeolite, hydrophobic zeolite, natural zeolite, molecular sieves, titanium oxide, polymers, porous polymers, polymer fibers and metal organic frameworks.

7. The system of claim 1, wherein the one or more adsorbent materials are contained in one or more removable cartridges.

8. An air treatment system for conditioning air in a building, comprising:

a fan-coil unit configured to circulate indoor air of an indoor space;

heating or cooling means configured to respectively heat or cool the indoor air;

a scrubber configured, during a scrub cycle, to scrub the indoor air from the indoor space, the scrubber placed within or adjacent to the indoor space and including one or more adsorbent materials arranged therein to adsorb at least one gas from the air of the indoor space during the scrub cycle, and

a source of purging gas;

wherein, during a purge cycle, the scrubber is configured to flow the purging gas over and/or through the one or more adsorbent materials to purge the one or more adsorbent materials of at least a portion of the at least one gas adsorbed by the one or more adsorbent materials and thereafter exhaust the purging gas via an exhaust.

9. The system of claim 8, wherein the purging gas includes indoor air from the indoor space.

10. The system of claim 8, wherein flow of indoor air from the indoor space to the scrubber or from the scrubber to the indoor space is ductless.

11. The system of claim 8, where the at least one gas includes one or more of carbon dioxide, volatile organic compounds, sulfur oxides, radon, nitrous oxides and carbon monoxide.

12. A method for conditioning air in a building, comprising:

circulating indoor air of an indoor space via a fan-coil unit;

scrubbing the indoor air during a scrub cycle using a scrubber placed within or adjacent to the indoor space, the scrubber including one or more adsorbent materials arranged therein to adsorb at least one gas from the air of the indoor space during the scrub cycle;

flowing a purging gas over and/or through the one or more adsorbent materials so as to purge the adsorbent materials of at least a portion of the at least one gas adsorbed by the one or more adsorbent materials; and

thereafter exhausting the purging gas flow via an exhaust.

13. The method of claim 12, wherein the purging gas includes indoor air from the indoor space.

14. The method of claim 12, wherein the fan-coil unit is supplied refrigerant or heating fluid from a variable refrigerant flow (VRF) system.

15. The method of claim 12, wherein the fan-coil unit is supplied chilled or heated water from a central chiller or boiler.

16. The method of claim 12, wherein the scrubber further comprises at least one of a damper and a fan, the method further comprising switching the scrubber from the scrub cycle to the purge cycle using the at least one of the fan and the damper.

17. The method of claim 16, further comprising performing the switching according to at least one of:

a preset schedule, a predetermined level of the at least one gas, the indoor space occupancy level, a manual trigger, a signaled command and an externally signaled command.