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Embodiments of systems, apparatus, and/or methods can provide a damper assembly for transport refrigeration systems. One embodiment can include a damper assembly including a damper door configured to operate in a first position (e.g., closed), a second position (e.g., open), and at least one interme

Embodiments of systems, apparatus, and/or methods can provide a damper assembly for transport refrigeration systems. One embodiment can include a damper assembly including a damper door configured to operate in a first position (e.g., closed), a second position (e.g., open), and at least one intermediate position. In one embodiment, a plurality of intermediate positions can be used to controllably vary a capacity of the transport refrigeration unit, or at least one component thereof. Embodiments of systems, apparatus, and/or methods can provide a damper assembly that can be accessed though an ambient portion of transport refrigeration systems or components.

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1. A transport refrigeration unit including a compressor, a primary refrigerant circuit including heat rejection heat exchanger downstream of said compressor, and a heat absorption heat exchanger downstream of said heat rejection heat exchanger, the transport refrigeration unit comprising: a barrier

1. A transport refrigeration unit including a compressor, a primary refrigerant circuit including heat rejection heat exchanger downstream of said compressor, and a heat absorption heat exchanger downstream of said heat rejection heat exchanger, the transport refrigeration unit comprising: a barrier to separate a first portion of the transport refrigeration unit to operate in a refrigerated environment from a second portion;at least one damper door in the refrigerated portion, the damper door to move between three or more positions; andan actuator operatively coupled to move the damper door, the actuator controlling movement of the damper door between an open position and a closed position and a plurality of intermediate positions between the open position and a closed position;where the plurality of intermediate positions of the damper door are configured to vary a transport refrigeration unit capacity or a transport refrigeration unit humidity capacity. 2. The transport refrigeration unit of claim 1, where the damper door can be sequentially reciprocally moved between the closed position and the plurality of intermediate positions or directly moved to the closed position and each of the plurality of intermediate positions. 3. The transport refrigeration unit of claim 2, where the plurality of intermediate positions are equally spaced, spaced in two or more different linear sections, spaced with changing granularity, non-linearly spaced, spaced without intermediate positions, spaced without repeatable intermediate positions or spaced having a prescribed relationship. 4. The transport refrigeration unit of claim 1, comprising at least one sensor on the damper door or the actuator. 5. The transport refrigeration unit of claim 1, comprising at least one sensor operatively coupled to provide a current stepped position of the damper door away from a first position. 6. The transport refrigeration unit of claim 5, wherein said at least one sensor comprises first sensor units positioned on the actuator, on a support structure of the damper door, on a support shaft of the damper door, on an internal wall of the transport refrigeration unit, in an air conduit of the transport refrigeration unit, in a passageway enclosing the damper door, or on the damper door, second sensor units operatively proximate to corresponding first sensor units. 7. The transport refrigeration unit of claim 6, comprising second sensor units operatively proximate to corresponding first sensor units where the first and second sensor units are wireless or wired and connected to a controller, the controller is configured to operate the transport refrigeration unit. 8. The transport refrigeration unit of claim 1, comprising: a passageway to operate in the refrigerated environment between a first opening and a second opening; andthe heat absorption heat exchanger in the passageway, where the damper door is coupled to the first opening, between the first opening and the heat absorption heat exchanger between the heat absorption heat exchanger and the second opening or coupled to the second opening. 9. The transport refrigeration unit of claim 1, where the actuator comprises a motor, solenoid, cam, an electric motor, a linear actuator, mechanism, piston, power train, or a manual operation, and where a supply air temperature and a return air temperature are used to determine a closed damper door position or an open damper door position. 10. The transport refrigeration unit of claim 1, where the plurality of intermediate positions of the damper door provides a corresponding variation in air flow. 11. The transport refrigeration unit of claim 1, where the plurality of intermediate positions of the damper door are used to vary system capacity in combination with at least one of fan units, compressor units, cargo type, cargo size, container size, economizer units, or system operational models. 12. A transport refrigeration unit comprising: an evaporator connected within the transport refrigeration unit;a damper configured to selectively vary a prescribed air flow in communication with the evaporator;at least one sensor operatively coupled to the damper;a controller coupled to the sensor to determine when the damper is in an open position, a closed position and plurality of intermediate positions between the open position and a closed position; anda damper actuator operatively coupled to the damper, the damper actuator to move the damper to the open position, the closed position and the plurality of intermediate positions between the open position and a closed position;the controller selecting one of the plurality of intermediate positions of the damper to vary a transport refrigeration unit capacity or a transport refrigeration unit humidity capacity. 13. The transport refrigeration unit of claim 12, comprising: a passageway including an inlet for communication with a first portion to be conditioned and an outlet for communication with the first portion to be conditioned;a blower assembly disposed in communication with the inlet and the outlet, the blower assembly configured to generate an airflow from the inlet toward the outlet; andat least one damper blade to controllably vary the air flow. 14. The transport refrigeration unit of claim 13, wherein the damper actuator comprises a motor coupled to a shaft and configured to pivot the damper blade between the open position and the closed position, wherein the transport refrigeration unit includes a refrigeration mode and a defrost mode, and wherein the damper blade is pivoted to one of said open position and one of the plurality of intermediate positions to direct air through the outlet in response to the refrigeration mode, wherein the damper blade is pivoted to the closed position to inhibit air from flowing through the outlet in response to the defrost mode, wherein a first end of the damper blade contacts an upper portion of the passageway and a second end of the damper blade contacts a lower portion of the housing when the damper blade is in the closed position, wherein the damper blade extends across a width of the passageway and wherein the second end of the damper blade contacts a stop member when the damper blade is in the open position. 15. A method of modifying a transport refrigeration unit including a damper assembly comprising: configuring the damper to operate in a closed position in a first mode of the transport refrigeration unit; andconfiguring the damper to vary a system capacity in a second mode of the transport refrigeration unit;wherein a damper actuator comprises mechanical linkages to pass through a thermal barrier to operatively couple the damper actuator to the damper, wherein the first mode is a defrost mode and the second mode is a refrigeration mode, wherein the second mode the damper is moved among an open position and a plurality of intermediate positions between the open position and a closed position to vary a transport refrigeration unit capacity or a transport refrigeration unit humidity capacity. 16. The method of claim 15, further comprising providing at least one sensor operatively connected to the damper assembly. 17. A transport refrigeration unit including a compressor, a condenser downstream of said compressor, an expansion device downstream of said condenser, and an evaporator downstream of said expansion device, the transport refrigeration unit comprising: a barrier to separate a first portion of the transport refrigeration unit to operate in a refrigerated environment from a second portion;the evaporator in a refrigerated portion;at least one damper door in the refrigerated portion;an actuator mechanically coupled to move the damper door, the actuator is positioned in the second portion, the actuator to move the damper between an open position and a closed position;wherein the transport refrigeration unit is configured to operate in a cooling mode and a defrost mode;wherein a position of the damper door is moved when the transport refrigeration unit is to operate under conditions where ice can form in the refrigerated portion;wherein the actuator is accessible via an access panel for the condenser in an ambient portion of the transport refrigeration unit. 18. The transport refrigeration unit of claim 17, where the actuator comprises a motor and bearing points to support movement of the damper door between the open position and the closed position. 19. The transport refrigeration unit of claim 18, wherein the damper door can be moved by manual operation of a portion of the actuator between the closed position and the open position. 20. The transport refrigeration unit of claim 17, where the second portion comprises an ambient portion, where the refrigerated portion of the transport refrigeration unit includes a passageway between an inlet and an outlet, and where the actuator is accessible from the ambient portion of the transport refrigeration unit. 21. The transport refrigeration unit of claim 17, where the transport refrigeration unit includes an insulated wall between a refrigerated portion and an ambient portion of the transport refrigeration unit, and comprising a damper assembly to pass through the insulated wall. 22. The transport refrigeration unit of claim 21, comprising a seal between the actuator and a first end of a damper shaft of the damper assembly. 23. The transport refrigeration unit of claim 17, wherein heat to defrost the evaporator is provided by operating the transport refrigeration unit in reverse, by resistive heat applied to the evaporator, or by providing heat from the compressor.