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

• US 9,976,760 B2
• Filed: 03/08/2016
• Issued: 05/22/2018
• 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:
  US15/064,584
• Publication Number:
  US 20160187012A1
• Time in Patent Office: 805 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, a source of outdoor air, and an exhaust, wherein the scrubber is configured during a purge cycle to direct a purging air flow received from the source of outdoor 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. An air treatment system for conditioning air in a building, comprising:

a fan-coil unit arranged adjacent to or within the indoor space;

a scrubber configured during a scrub cycle to scrub air from an indoor space of the building, and being positioned within or adjacent the indoor space, the scrubber including;

one or more adsorbent materials arranged therein to adsorb at least one predetermined gas from the air of the indoor space during the scrub cycle,

a source of outdoor air, and

an exhaust,

wherein the scrubber is configured;

during a purge cycle to direct a purging air flow, received via the source of outdoor 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, and

during a scrub cycle to supply scrubbed air to the fan-coil unit.

2. A system according to claim 1, wherein the scrubber is configured to supply scrubbed air exiting the scrubber to the indoor space.

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

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

optionally heating or cooling the circulated indoor air;

scrubbing the indoor air during a scrub cycle using a scrubber placed within or adjacent to the indoor space, the scrubber comprising;

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

a source of outdoor air, and an outdoor exhaust;

flowing a purging air flow received via the source of outdoor air 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 air flow via the exhaust.

4. The method of claim 3, wherein the fan-coil unit is supplied refrigerant or heating fluid from a variable refrigerant flow (VRF) system.

5. The method of claim 3, wherein the fan-coil unit is supplied chilled or heated water from a central chiller or boiler.

6. The method of claim 3, wherein the scrubber further comprises at least one of a damper and a fan, and wherein the method further comprises switching the scrubber from the scrub cycle to the purge cycle using the at least one of the fan and the damper.

7. The method of claim 3, further comprising performing the switching according to at least one of:

a preset schedule, a predetermined level of the predetermined gas, the enclosed space occupancy level, a manual trigger, a signaled command and an externally signaled command.

8. A system for conditioning air in a building comprising:

a plurality of indoor spaces within the building;

a plurality of fan-coil units arranged adjacent to or within the plurality of indoor spaces and additionally configured to at least one of heat and cool the air of the plurality of indoor spaces; and

a scrubber arranged within the building, the scrubber configured during a scrub cycle for scrubbing of indoor air from the plurality of indoor spaces, the scrubber including;

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

a source of outdoor air, and

an exhaust,

wherein the scrubber is configured during a purge cycle to direct a purging air flow received from the source of outdoor 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.

9. The system of claim 8 wherein the fan-coil unit is supplied refrigerant or heating fluid from a variable refrigerant flow (VRF) system.

10. The system of claim 8 wherein more than one of the plurality of fan-coil units is supplied refrigerant or heating fluid from a common variable refrigerant flow (VRF) system.

11. The system of claim 8 wherein the fan-coil unit is supplied chilled or heated water from a central chiller or boiler.

12. The system of claim 8 wherein scrubbed air exiting the scrubber is directed to the plurality of indoor spaces via conduits.

13. The system of claim 8 wherein indoor air is directed to the scrubber from the plurality of indoor spaces via conduits.

14. A system of claim 13 wherein the conduits are installed and configured for directing the indoor air from the plurality of indoor spaces to the scrubber.

15. A system of claim 13 wherein the conduits are pre-existing in the building.

16. A system of claim 15 wherein the pre-existing conduits are configured for ventilation, elevators, exhaust, or smoke exhaust.

17. A system of claim 8 and comprising a pre-conditioning unit configured to at least heat or cool outside air or scrubbed air exiting the scrubber and direct the preconditioned air to the plurality of indoor spaces.

18. A system of claim 17 wherein the pre-conditioned air is directed to the plurality of indoor spaces via conduits.

19. The system of claim 8 where the predetermined gas is selected from the group consisting of:

carbon dioxide, volatile organic compounds, sulfur oxides, radon, nitrous oxides and carbon monoxide.