High efficiency air delivery system and method

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, and
• harvesting 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.

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, and
• a 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.

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.