CO2 utilization by low temperature heat upgradation for improved energy efficiency

A system comprising:

• a piece of infrastructure;
• an exhaust fluid input conduit fluidly coupled to an exhaust of the piece of infrastructure;
• a compressor fluidly coupled to the exhaust fluid input conduit via a compressor inlet line;
• a collection vessel disposed between the exhaust fluid input conduit and the compressor;
• an expander fluidly coupled to the compressor;
• a first heat exchanger disposed fluidly between the expander and the compressor, such that the first heat exchanger receives a fluid from the expander and the fluid output by the first heat exchanger is input into the compressor;
• a second heat exchanger disposed fluidly between the compressor and the expander, such that the second heat exchanger receives the fluid from the compressor and the fluid output by the second heat exchanger is input into the expander;
• and
• one or more fluid outlet conduits, wherein the system is configured such that the fluid is configured to flow from the piece of infrastructure using the exhaust fluid input conduit before being flowed into the collection vessel, before being flowed into the compressor, before being flowed into the second heat exchanger, before being flowed into the expander, and before being flowed into the first heat exchanger.

A method of operating a heating and cooling system, comprising:

• receiving an exhaust gas from a piece of infrastructure;
• compressing the exhaust gas using a compressor;
• compressing the exhaust gas using a second compressor;
• running the exhaust gas through a first heat exchanger after compressing the exhaust gas in the second compressor;
• expanding the exhaust gas using an expander after running the exhaust gas through the first heat exchanger;
• running the exhaust gas through a second heat exchanger after the exhaust gas is expanded in the expander;
• and
• exhausting the exhaust gas from the heating and cooling system after expanding or compressing the exhaust gas.