Systems and methods for regenerating adsorbents for indoor air scrubbing

• US 10,675,582 B2
• Filed: 03/22/2018
• Issued: 06/09/2020
• Est. Priority Date: 07/18/2012
• Status: Active Grant

• Current Assignee: Enverid Systems, Inc.
• Original Assignee: Enverid Systems, Inc.
• Inventors: Meirav, Udi, Biran, Israel, Bechar, Abraham
• Primary Examiner(s): Holecek, Cabrena
• Application Number:
  US15/933,132
• Publication Number:
  US 20180207574A1
• Time in Patent Office: 810 Days
• CPC Class Codes: B01D 2259/40098 with other heating means
• CPC Class Codes: B01D 2259/4508 for cleaning air in buildings
• CPC Class Codes: B01D 53/0438 Cooling or heating systems
• CPC Class Codes: Y02B 30/52 Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
• CPC Class Codes: Y02C 20/10 of nitrous oxide (N2O)

Abstract

Some embodiments of the disclosure correspond to, for example, a system for scrubbing a mixture of gases and/or contaminants from indoor air from an enclosed space to remove at least one gas and/or contaminant from the mixture of gases and/or contaminants. The system may include one or more adsorbent materials configured to be cycled between adsorption and regeneration of at least one of gas and/or contaminant from the mixture of gases and/or contaminants via a temperature swing adsorption cycle (for example), regeneration means configured to regenerate one or more adsorbent materials. The regeneration means may be configured at a regeneration temperature to regenerate the one or more adsorbent materials.

Claims

1. A method for removing at least one gas and/or contaminant from a mixture of gases and/or contaminants of an indoor airflow from an enclosed space, comprising:

providing a scrubber system having one or more adsorbent materials configured for regeneration;

providing a dedicated heat pump to remove heat from the indoor airflow of an enclosed space;

scrubbing the indoor air by flowing at least a portion of the indoor air over the one or more adsorbent materials;

heating a purge gas and/or the one or more adsorbent materials with the removed heat; and

periodically regenerating the one or more adsorbent materials during a regeneration cycle via at least one of;

flowing the heated purge gas over and/or through the one or more adsorbent materials, and

heating the one or more adsorbent materials with the removed heat and flowing the purge gas over and/or through the heated one or more adsorbent materials.

2. The method of claim 1, wherein the at least one gas and/or contaminant of the mixture of gases and/or contaminants are selected from the group consisting of:

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

3. The method of claim 2, wherein the purge gas comprises outdoor air, and wherein:

the method further includes providing an outdoor air inlet configured to receive the outdoor air at an outdoor air temperature; and

heating directly and/or indirectly the received outdoor air by the dedicated heat pump to a regeneration temperature for regenerating the one or more adsorbent materials.

4. The method of claim 3, wherein the regeneration temperature is about 10°

C. greater than the outdoor air temperature.

5. The method of claim 1, wherein the removing of heat from the indoor air results in a reduction of the cooling load of the enclosed space.

6. The method of claim 5, wherein the reduction of the cooling load of the enclosed space is configured to minimize a difference between an amount of the reduction of the cooling load and an energy consumption of the dedicated heat pump.

7. The method of claim 1, wherein the dedicated heat pump is configured to collect heat from a source of warm air.

8. The method of claim 7, wherein the source of warm air comprises at least one of a chiller, a compressor, a cooling tower, a generator, a solar heater, and a furnace.

9. The method of claim 1, further comprising providing an HVAC system having circulating air flow in the enclosed space, and wherein the scrubber system is configured to intercept a portion of the air flow.

10. The method of claim 9, wherein the portion is less than 20% of a volume of the circulating airflow.

11. The method of claim 1, wherein an evaporator side of the dedicated heat pump is in thermal communication with circulating indoor air.

12. The method of claim 1, wherein an HVAC system provides the dedicated heat pump, and wherein the dedicated heat pump includes a refrigerant configured such that a portion of the refrigerant, in its heated state is diverted to heat to the purge gas and/or the one or more adsorbent materials.

13. The method of claim 12, wherein less than 50% of a volume of the refrigerant flow is diverted to heat at least one of the purge gas and the one or more adsorbent materials.

14. The method of claim 12, wherein less than 20% of a volume of the refrigerant flow is diverted to heat at least one of the purge gas and the one or more adsorbent materials.

15. The method of claim 1, further comprising providing a controller which controls the delivery of heat by the dedicated heat pump to the one or more adsorbent materials in coordination with regeneration of the one or more adsorbent materials.

16. The method of claim 1, further comprising providing a plurality of scrubber systems, and wherein the dedicated heat pump comprises a single heat pump configured to provide heat to the plurality of scrubber systems.

17. The method of claim 16, further comprising providing a network of conduits configured for delivering heat from the dedicated heat pump to the more than one scrubber system.

18. The method of claim 17, further comprising controlling coordination of the dedicated heat pump, network of conduits and the more than one scrubber system so that regeneration heat is available to each scrubber system when it is required for regeneration.

19. The method of claim 18, wherein controlling further includes controlling coordination of at least one of the dedicated heat pump, network of conduits and more than one scrubber, according to at least one of the following parameters:

an occupancy level of one or more areas in the enclosed space;

a level of the at least one of gas and/or contaminant in indoor air circulating in the one or more areas of the enclosed space;

a level of the at least one of gas and/or contaminant accumulated in the one or more adsorbent materials;

a level of the at least one of gas and/or contaminant in air exiting a least one of the more than one scrubber system;

an indoor air temperature and/or an indoor air humidity level;

an outdoor air temperature and/or an outdoor air humidity level; and

a preset schedule.