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HVAC systems and methods for delivering highly efficient heating and cooling using ambient air as the working fluid. A plenum has an upstream inlet and a downstream outlet, each in fluid communication with a target space to be heated or cooled. Ambient air is drawn into the inlet at an incoming pres

HVAC systems and methods for delivering highly efficient heating and cooling using ambient air as the working fluid. A plenum has an upstream inlet and a downstream outlet, each in fluid communication with a target space to be heated or cooled. Ambient air is drawn into the inlet at an incoming pressure and an incoming temperature. The inlet and outlet are gated, respectively, by first and second rotary pumps. A heat exchanger in the plenum transfers heat into or out of the air, provoking a change in air volume within the plenum. Work is harvested in response to change in air volume. The systems and methods can be configured to replace a traditional blower fan used to circulate the interior and exterior air. The systems and methods can be configured to implement a technique referred to as Convergent Refrigeration.

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1. A method for heating or cooling a target space by circulating ambient air sourced from the target space across a heat exchanger and returning the air back to the target space at a higher or lower temperature, said method comprising the steps of: providing a plenum having an upstream inlet in flui

1. A method for heating or cooling a target space by circulating ambient air sourced from the target space across a heat exchanger and returning the air back to the target space at a higher or lower temperature, said method comprising the steps of: providing a plenum having an upstream inlet in fluid communication with the target space and a downstream outlet in fluid communication with the target space,drawing ambient air from the target space into the inlet of the plenum at an incoming pressure and an incoming temperature,inlet gating the plenum at an upstream location with a first pump,outlet gating the plenum at a downstream location with a second pump,operatively locating a heat exchanger within the plenum in-between the first and second pumps, the air in the plenum upstream of the heat exchanger having an Approaching Temperature,transferring heat into or out of the air with the heat exchanger, said step of transferring heat including provoking a change in the volume of the air within the plenum,harvesting work directly from at least one of the first and second pumps in response to changes in the volume of the air in the plenum,rotating at least one rotor within the first pump to move the air in a downstream direction along the plenum without changing the pressure of the air within the plenum greater than about 20% relative to the incoming pressure, anddischarging air from the outlet gate at a differentiated temperature relative to the incoming temperature. 2. The method of claim 1, wherein said step of rotating at least one rotor does not change the pressure of the air greater than about 10% relative to the incoming pressure. 3. The method of claim 1, further including the step of in-taking the air into the first pump using substantially atmospheric pressure from the target space. 4. The method of claim 1, wherein said inlet gating step includes preventing backflow of substantially all of the air entering the plenum, and said outlet gating step includes preventing backflow of substantially all of the air exiting the plenum. 5. The method of claim 1, wherein said discharging step includes rotating at least one rotor within the second pump to discharge the air from the outlet of the plenum. 6. The method of claim 1, further including the step of proportionally varying the relative rotation speed of the first pump relative to the second pump to maintain a substantially constant air pressure within the plenum. 7. The method of claim 1, wherein the target space comprises an enclosure for a heat-emitting electronic device. 8. The method of claim 1, further including the step of circulating water through the heat exchanger. 9. The method of claim 8, wherein said step of circulating water includes passing the water through an underground geothermal heat exchanger. 10. A method for heating or cooling a target space by circulating ambient air sourced from the target space across a heat exchanger and returning the air back to the target space at a higher or lower temperature, said method comprising the steps of: providing a plenum having an upstream inlet in fluid communication with the target space and a downstream outlet in fluid communication with the target space,drawing ambient air from the target space into the inlet of the plenum at an incoming pressure and an incoming temperature,inlet gating the plenum at an upstream location with a first rotary pump, in-taking the air into the first rotary pump using substantially atmospheric pressure from the target space, rotating at least one rotor within the first rotary pump to pump the air in a downstream direction along the plenum without changing the pressure of the air greater than about 10% relative to the incoming pressure, preventing backflow of substantially all of the air entering the plenum,outlet gating the plenum at a downstream location with a second rotary pump, preventing backflow of substantially all of the air exiting the plenum,operatively locating a heat exchanger within the plenum in-between the first and second rotary pumps,moving the air across the heat exchanger within the plenum, said moving step including concurrently rotating the first and second rotary pumps,transferring heat into or out of the air with the heat exchanger, the heat exchanger having a Heat Exchanger Temperature, the air in the plenum upstream of the heat exchanger having an Approaching Temperature, said step of transferring heat including provoking a change in the volume of the air within the plenum,discharging air from the outlet gate at a differentiated temperature relative to the incoming temperature, said discharging step including rotating at least one rotor within the second rotary pump to discharge the air from the outlet of the plenum,maintaining a generally constant pressure of the air transiting the plenum, said maintaining step including proportionally varying the relative rotation speed of the first rotary pump relative to the second rotary pump, andharvesting work directly from at least one of the first and second rotary pumps in response to changes in the volume of the air in the plenum. 11. The method of claim 10, further including the step of circulating water from a geothermal source through the heat exchanger. 12. A high-efficiency air delivery system for circulating ambient air from a target space across a heat exchanger and back into the target space at a higher or lower temperature, said system comprising: a plenum for routing air as a working fluid from an inlet to an outlet, said inlet disposed to receive ambient air at ambient pressure and ambient temperature from the target space, said outlet disposed to expel the air at a differentiated temperature back into the target space,an inlet gate disposed in said plenum adjacent said inlet, said inlet gate comprising a first pump configured to admit air into said plenum without changing the pressure of the air greater than about 20% relative to atmospheric while concurrently controlling substantially all of the movement of air entering said plenum through said inlet,an outlet gate disposed in said plenum adjacent said outlet, said outlet gate comprising a second pump configured to control substantially all of the movement of air exiting said plenum through said outlet,the portion of said plenum between said first and second pumps comprising a controlled pressure zone, said controlled pressure zone establishing a continuously bounded volume of air-in-transit between said inlet and said outlet gates,a heat exchanger disposed in said controlled pressure zone and directly exposed to the air transiting therethrough, the air having an Approach Air Temperature, said heat exchanger having a Heat Exchanger Temperature, the difference between the Approach Air Temperature and the Heat Exchanger Temperature comprising an Approach Air Temperature Differential, said heat exchanger configured to move heat into or out of the air transiting through said controlled pressure zone and thereby provoke a change in the volume of the air within said controlled pressure zone,a work harvester operatively connected to at least one of said first and second pumps for recovering work in response to change in the volume of the air in said controlled pressure zone, anda controller operatively connected to at least one of said first and second pumps, said controller configured to maintain a predetermined Approach Air Temperature Differential by manipulating at least one of the first and second pumps to increase or decrease the bounded volume of air in said controlled pressure zone to maintain a generally constant pressure of the air transiting said controlled pressure zone. 13. The system of claim 12, wherein said heat exchanger comprises at least a portion of a heat pipe. 14. The system of claim 12, wherein said controller is operatively connected to both of said first and second pumps. 15. The system of claim 14, wherein said controller includes a variable transmission, said variable transmission having a proportionally variable coupling between an inlet rotor and an outlet rotor. 16. The system of claim 12, wherein said first pump has at least two rotors supported in parallel within an inlet housing, and said second pump has at least two rotors supported in parallel within an outlet housing. 17. The system of claim 12, wherein said work harvester comprises a generator operatively coupled to one of said first and second pumps. 18. The system of claim 12, wherein said work harvester comprises one motor/generator operatively coupled to said first pump and another motor/generator operatively coupled to said second pump. 19. A high-efficiency air delivery system for circulating ambient air from a target space across a heat exchanger and back into the target space, said system comprising: a plenum for routing air as a working fluid from an inlet to an outlet, said inlet disposed to receive ambient air at ambient pressure and ambient temperature from the target space, said outlet disposed to expel the air at a differentiated temperature back into the target space, an air filter associated with said inlet for filtering particulate from the air entering said plenum,an inlet gate disposed in said plenum adjacent said inlet, said inlet gate comprising a first rotary pump configured to admit air into said plenum without changing the pressure of the air greater than about 10% relative to atmospheric while concurrently controlling substantially all of the movement of air entering said plenum through said inlet, said first rotary pump having at least two rotors supported in parallel within an inlet housing,an outlet gate disposed in said plenum adjacent said outlet, said outlet gate comprising a second rotary pump configured to control substantially all of the movement of air exiting said plenum through said outlet, said second rotary pump having at least two rotors supported in parallel within an outlet housing,the portion of said plenum between said inlet gate and outlet gate comprising a controlled pressure zone, said controlled pressure zone establishing a continuously bounded volume of air-in-transit between said inlet and said outlet gates,a heat exchanger disposed in said controlled pressure zone and directly exposed to the air transiting therethrough, the air in said controlled pressure zone having an Approach Air Temperature, said heat exchanger having a Heat Exchanger Temperature, the difference between the Approach Air Temperature and the Heat Exchanger Temperature comprising an Approach Air Temperature Differential, said heat exchanger configured to move heat into or out of the air transiting through said controlled pressure zone and thereby provoke a change in the volume of the air within said controlled pressure zone, said heat exchanger comprising at least a portion of a heat pipe,one motor/generator operatively coupled to said first rotary pump, and another motor/generator operatively coupled to said second rotary pump,a controller operatively connected to at least one of said motor/generators, said controller configured to maintain a predetermined Approach Air Temperature Differential by manipulating the at least one of said motor/generators to increase or decrease the bounded volume of air in said controlled pressure zone to maintain a generally constant pressure of the air transiting said controlled pressure zone. 20. The system of claim 19, wherein said heat exchanger comprises a water-fed geothermal heat exchanger.