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There have been many global developments on the science of CO2 recovery from the atmosphere. Existing and future buildings use A/C systems for temperature control of ventilation systems. Large buildings move massive amounts of air during the course of a day.
At design rates of 10 to 20 cfm (cubic feet/minute) per person large assemblies or office towers rates of ventilation can reach up to 100,000 cfm or more per building. This air is required to be temperature controlled, which is achieved by air conditioning units, which extract heat energy from the air stream and reject this heat to the outside (a heat pump can also operate in reverse mode, heating the inside air stream and absorbing heat from the outside air).
The fan motors used to move the conditioned air consumes considerable electricity to operate as do the outside air fans used to cool the A/C system. The outside cooling (heating) loop is operated by forcing air through fin-tube radiators which contain pressurized refrigerant circulating in a closed loop cycle.