The air sterilization device with heating apparatus comprises a mainframe, a sterilization system, a heating system, circuits and a control system and a housing. The sterilization system includes an ultraviolet sterilization apparatus to sterilize and disinfect air; the heating system heats the air to inactivate virus; and the housing has an air inlet and an air outlet. Air can circulate into the housing through the air inlet with the action of mainframe and then the air is discharged from the air outlet into a room after the disinfection and sterilization processes are finished. The device with heating apparatus aims at the secondary inactivation of viruses by high temperature after the sterilization and disinfection processes are finished by ultraviolet sterilization apparatus and heating system, and at the decomposition of ozone produced in the process of ultraviolet disinfection to eliminate secondary air pollution by ozone.

The present disclosure is directed to an HVAC system including a refrigeration circuit and a greenhouse gas removal circuit. The refrigerant circuit includes a first heat exchanger, a second heat exchanger, and at least one conduit configured to direct a refrigerant between the first heat exchanger and the second heat exchanger. The greenhouse gas removal circuit includes a first vessel adjacent to the first heat exchanger, a second vessel adjacent to the second heat exchanger, and at least one additional conduit configured to direct a solvent between the first vessel and the second vessel. The solvent present at the first vessel absorbs or adsorbs greenhouse gas (e.g., CO.sub.2) from a first airflow biased over the first heat exchanger. Heat rejected by the second heat exchanger into a second airflow is used to drive, at the second vessel, separation of the greenhouse gas (e.g., CO.sub.2) from the solvent.

The present disclosure is directed to an HVAC system including a refrigeration circuit and a greenhouse gas removal circuit. The refrigerant circuit includes a first heat exchanger, a second heat exchanger, and at least one conduit configured to direct a refrigerant between the first heat exchanger and the second heat exchanger. The greenhouse gas removal circuit includes a first vessel adjacent to the first heat exchanger, a second vessel adjacent to the second heat exchanger, and at least one additional conduit configured to direct a solvent between the first vessel and the second vessel. The solvent present at the first vessel absorbs or adsorbs greenhouse gas (e.g., CO.sub.2) from a first airflow biased over the first heat exchanger. Heat rejected by the second heat exchanger into a second airflow is used to drive, at the second vessel, separation of the greenhouse gas (e.g., CO.sub.2) from the solvent.

A method for improving indoor air quality in a room, comprising drawing air from the room and guiding the air into a gas/liquid contactor charged with aqueous alkali hydroxide/H.sub.2O.sub.2 solution, passing the air through a perforated membrane installed in the gas/liquid contactor below the surface level of the aqueous alkali hydroxide/H.sub.2O.sub.2 solution, such that bubbles produced travel through said solution, and getting treated air with improved quality from said gas/liquid contactor, said treated air is characterized by having: reduced carbon dioxide levels; and/or reduced VOC levels; and/or reduced microbiological load. An air purifier to carry out the method is also provided.

A method for improving indoor air quality in a room, comprising drawing air from the room and guiding the air into a gas/liquid contactor charged with aqueous alkali hydroxide/H.sub.2O.sub.2 solution, passing the air through a perforated membrane installed in the gas/liquid contactor below the surface level of the aqueous alkali hydroxide/H.sub.2O.sub.2 solution, such that bubbles produced travel through said solution, and getting treated air with improved quality from said gas/liquid contactor, said treated air is characterized by having: reduced carbon dioxide levels; and/or reduced VOC levels; and/or reduced microbiological load. An air purifier to carry out the method is also provided.