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

• US 9,316,410 B2
• Filed: 11/16/2012
• Issued: 04/19/2016
• 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:
  US14/359,280
• Publication Number:
  US 20140326428A1
• Time in Patent Office: 1,250 Days
• US Class Current: 1/1
• 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. A system for conditioning air in an indoor space in a building, comprising:

a fan-coil unit arranged adjacent to or within the indoor space within the building and additionally configured to at least one of heat and cool the air of the indoor space without introducing outdoor air into 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 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.

2. The system of claim 1, wherein the fan-coil unit is supplied a refrigerant or heating fluid from a Variable Refrigerant Flow (VRF) system.

3. The system of claim 1, wherein the fan-coil unit is supplied chilled or heated water from a central chiller or boiler.

4. 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.

5. The system of claim 1, wherein the predetermined gas is selected from the group comprising:

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

6. The system of claim 1, wherein the at least one of the adsorbent materials is selected from the group comprising:

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 at least one of the adsorbent materials is contained in one or more removable cartridges.

8. The system of claim 1, further comprising at least one gas detection sensor for detecting a level of the at least one predetermined gas.

9. The system of claim 1, wherein the scrubber further comprises at least one of a damper and a fan configured to switch the scrubber from the scrub cycle to the purge cycle.

10. The system of claim 9, further comprising a controller to perform the switching, wherein the controller is programmed to switch between the scrub cycle and the purge cycle by at least one of:

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

11. The system of claim 1, further comprising an air plenum over a ceiling of the indoor space or adjacent to the indoor space, wherein the air plenum houses the fan-coil unit.

12. The system of claim 1, further comprising an air plenum over a ceiling of the indoor space or adjacent to the indoor space, wherein the air plenum houses the scrubber.

13. The system of claim 1, wherein the fan-coil unit includes a housing, and wherein at least a portion of the scrubber is housed within the housing.

14. The system of claim 1, wherein a fan of the fan-coil unit is configured to direct indoor air flow into the scrubber.

15. The system of claim 1, further comprising a heater, wherein the received outdoor air is heated by the heater.

16. The system of claim 15, wherein the heater is selected from the list comprising:

a heat pump, an electric heating coil, a coil or radiator with heated fluid supplied from a central heating system, a solar heater and a furnace.

17. The system of claim 16, wherein the heat pump removes heat from the indoor air.

18. The system of claim 15, wherein the heated outdoor air is heated prior to being supplied to the scrubber.

19. The system of claim 1, further comprising at least one additional air treatment component selected from the list comprising:

an air ionizer, an ozone source, a source of radiation, a membrane, foam, paper, fiberglass, a heater, a particle filter, an ultraviolet anti-microbial device, an ion or plasma generator, an oxide, a catalyst and a chemical catalyst.

20. The system of claim 19, wherein the at least one additional air treatment component is placed within the scrubber.

21. The system of claim 19, wherein the at least one additional air treatment component is placed within the indoor space.

22. The system of claim 19, wherein the indoor air flows out of the fan-coil unit via a duct and the at least one additional air treatment component is placed within the duct.

23. The system of claim 1, wherein a plurality of indoor spaces are provided and a plurality of fan-coil units are provided, the plurality of fan-coil units are arranged adjacent to or within the plurality of indoor spaces and the scrubber is configured during a scrub cycle for scrubbing of indoor air from the plurality of indoor spaces.