BUILDING TERMINAL FAN COIL UNIT WITH GAS CONTAMINENTS REMOVAL, TRANSPORT REFRIGERATION SYSTEM WITH GAS CONTAMINENTS REMOVAL, AND METHODS FOR SAME

Abstract

Embodiments of systems, apparatus, and/or methods can provide conditioning building terminal fan coil units (e.g., ceiling mounted) configured with a filter to remove particles, selected gases such as formaldehyde, or provide biocidal capability while retaining sufficient FCU airflow. Embodiments of systems, apparatus, and/or methods according to the application can provide a transport refrigeration system and/or components to regulate ethylene gas levels in airflow, for example, of air conditioned by the transport refrigeration system. In one embodiment, a portion of the air conditioned by the transport refrigeration system can pass through an ethylene filter.

Description

FIELD OF THE INVENTION

This invention relates generally to the field of building terminal fan coil units (FCU), transport refrigeration systems, and methods of operating the same.

BACKGROUND OF THE INVENTION

Building terminal fan coil units can be used in buildings to control thermal comfort (e.g., temperature and humidity) and air quality. Building terminal fan coil units can be mounted on or above a ceiling, on or in the wall, or on or below the floor of a room. The related art removal of airborne indoor contaminants, which include particles, gases, and biologicals, is limited because of hardware size limitations and fan pressure constraints. Related art building terminal fan coil units provide only limited particle removal capabilities and no gases and biological removal attributes.

Perishable items must be maintained within a temperature range to reduce or prevent, depending on the items, spoilage, or conversely damage from freezing during transport. A transport refrigeration unit is used to maintain proper conditions within a transport cargo space. The transport refrigeration unit can regulate conditioned air delivery by the transport refrigeration unit to a container or the transport cargo space. Further, the presence of harmful gases or biologicals should be reduced or eliminated within the refrigerated storage area. For gases, related art transportation refrigeration units can use outdoor air ventilation to reduce gas concentration levels through dilution.

SUMMARY OF THE INVENTION

In view of the background, it is an object of the application to provide building terminal fan coil units and methods for same.

Another object of the application is to provide a building terminal fan coil unit and methods for same that incorporate an integrated airborne particle and gas removal capability into the FCU design.

One embodiment of a building terminal fan coil unit according to the application can include a formaldehyde gas removal filter as an integral component of the FCU.

In view of the background, it is an object of the application to provide a transport refrigeration system, transport refrigeration unit, and methods of operating same that can maintain cargo quality or environment by selectively controlling transport refrigeration system components.

One embodiment according to the application can include an ethylene filter for a transport refrigeration system. The ethylene filter can be selectively mounted in the transport refrigeration system. The ethylene filter can be an integral component of the transport refrigeration unit.

One embodiment according to the application can include a control module for a transport refrigeration system for controlling the transport refrigeration system to regulate airflow, for example, of air conditioned by the transport refrigeration system, so that a portion of the airflow can pass through the ethylene filter.

One embodiment of a transport refrigeration system according to the application can include a sensing and a control module to control the portion of airflow passing through the ethylene filter and/or ventilation airflow to regulate the concentration of ethylene gas inside the refrigerated space.

In an aspect of the invention, a building terminal fan coil unit can include an airflow inlet opening and a airflow outlet opening and a fan disposed in the enclosure, and operable to cause air to flow into the airflow inlet opening and out of the airflow outlet opening, a heat exchanger positioned inside the enclosure so that the airflow will pass therethrough; and an integrated gas removal filter positioned so that the airflow will pass therethrough, said filter operable to provide a physical material removal capability and a formaldehyde gas removal capability with one percent (1%) or more formaldehyde gas removal by filter media weight and less than a 30 Pascal pressure drop at a face airflow rate of 1 m/sec.

In an aspect of the invention, an apparatus for controlling ethylene concentration to perishable goods in a mobile container having a refrigeration module for delivering conditioned air into the container, the apparatus can include an outlet port to supply air from the refrigeration unit; an inlet port to return air to the refrigeration unit, at least one filter to remove ethylene gas mounted at the refrigeration unit, and a controller coupled to control operation of the refrigeration unit.

In an aspect of the invention, a method of operating a transport refrigeration unit can include determining an ethylene gas level, comparing said ethylene gas level to a corresponding threshold value, entering a filtering mode of said transport refrigeration unit to reduce the ethylene gas level when the ethylene gas level is greater than the threshold value, and exiting the filtering mode of the transport refrigeration unit when the ethylene gas level is less than the threshold value.

BRIEF DESCRIPTION OF THE DRAWINGS

Novel features that are characteristic of exemplary embodiments of the invention are set forth with particularity in the claims. Embodiments of the invention itself may be best be understood, with respect to its organization and method of operation, with reference to the following description taken in connection with the accompanying drawings in which:

FIG. 1 is a schematic view of an embodiment of a building terminal fan coil unit according to the application where an exemplary single air inlet and an exemplary single air outlet are shown;

FIG. 2 is an isometric view of an embodiment of a building terminal fan coil unit according to the application where an exemplary single air inlet and exemplary multiple air outlets are shown;

FIG. 3 is a schematic view of an embodiment of a building terminal fan coil unit located above a dropped ceiling according to the application where an exemplary single unducted return air inlet above the ceiling and an exemplary single supply air outlet into a room are shown;

FIG. 4A is a diagram illustrating an exemplary filter for a building terminal fan coil unit according to an embodiment of the application;

FIG. 4B is a diagram illustrating another exemplary filter for a building terminal fan coil unit according to an embodiment of the application;

FIG. 5 is a diagram that shows an embodiment of a transport refrigeration system according to the application;

FIG. 6 is a flowchart that shows an embodiment of a method for operating a transport refrigeration system according to the application.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Reference will now be made in detail to exemplary embodiments of the application, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to the same or like parts.

FIG. 1 is a diagram that shows an exemplary embodiment of a building terminal fan coil unit according to the application. As shown in FIG. 1, a building terminal fan coil unit 100 can be stand alone mounted in a room. In one embodiment, a building terminal fan coil unit 100 can be mounted attached to building structure 140 and recessed in drop ceiling 141. Inside a housing 120 of a building terminal fan coil unit 100 are a fan 110 and a heat exchanger 112. In a bottom wall 121 of housing 120 can be at least one fan inlet 130 and at least one fan outlet 135. The fan 110 can draw air from the corresponding room (e.g., through the inlet 130) and through the heat exchanger 112, and to discharge conditioned air back to the room through the outlet 135. In one embodiment, a building terminal fan coil unit 100 can be a room air conditioning unit.

As shown in FIG. 2, additional fan outlets 132, 133 can be provided on a lower surface of the housing 120 of a building terminal fan coil unit 100. Alternatively, more than one fan inlet can be used.

In operation, the fan 110 draws air in through the inlet 130 (e.g., return air), passes the air through a filter 150, passes the air through the heat exchanger 112 where it is conditioned, and then the air discharges back into the room via outlet 135 (e.g., 132, 133). Alternatively, components of the building terminal fan coil unit 100 can use other arrangements, for example, the heat exchanger 112 can be located after the fan 110 in the airflow or the components can surround the fan 110 as in a cassette FCU arrangement.

FIG. 3 is a schematic view of an embodiment of a building terminal fan coil unit according to the application where a single ducted air inlet/a return air plenum above the ceiling and a single air outlet into the room are shown. As shown in FIG. 3, fan inlet 134 can be formed in side walls (e.g., a single side wall) respectively of the housing 120 and are to be in fluid flow communication with that normally dead air space between the building structure 140 and the drop ceiling 141. In one embodiment, return air (e.g., ducts, vents) components are not integrated as part of a building fan coil unit 100. Accordingly, a duct (not shown)/a return air plenum providing fluid flow connection from the room through the drop ceiling 141 can be spaced apart from a building fan coil unit 100. Alternatively, the spaced apart return air component can be coupled to a fan inlet (e.g., 134) of the building terminal fan coil unit 100. Accordingly, a duct (not shown)/a supply air plenum providing fluid flow connection to the room through the drop ceiling 141 can be spaced apart from a building fan coil unit 100. Alternatively, the spaced apart supply air component can be coupled to a fan outlet (e.g., fan outlet 135) in a sidewall of the building terminal fan coil unit 100 to eliminate an airflow outlet directly through the housing 120 to the room.

In one embodiment, building terminal fan coil units can be mounted on or above a ceiling, on or in the wall, or on or in the floor of a room. Further, embodiments of a building terminal fan coil unit according to the application may also be mounted in a room that does not have a drop ceiling.

In one embodiment, the building terminal fan coil unit 100 can be a fan coil unit to include the filter 150 positioned in the airflow of the indoor unit (e.g., between the inlet 130 and the outlet 135). The filter 150 can be mounted outside the housing 120 or inside the housing 120 or at the airflow inlet for easy maintenance. The filter 150 can be configured to reduce contaminants including combinations of particles, gases, and biologicals.

The inventors developed a low-pressure-drop, flat filter 150 that can be installed (e.g., at the return air inlet of building terminal fan coil units) to provide an effective gas contaminants removal capability. As shown in FIG. 4A, in one embodiment, the filter 150 is constructed from four major elements. These include the filter media 152, a cover web 155 on either side of the filter media, and filter frame. The filter media 152 has been specifically designed to increase or maximize gas removal capabilities while reducing or minimizing pressure drop characteristics. The cover web 155 has been designed to provide both a particle removal and biological neutralization capability while reducing or minimizing pressure drop characteristics. In one embodiment, a biocide agent can be sprayed to adhere to the cover web 155. Filter media 152 is an adsorption media found to meet the range of specific particle removal criteria, airflow rates, filter pressure drop budgets, and volatile organic compound (e.g., formaldehyde) gas adsorption properties required while properly working within the operating envelop of the building terminal fan coil unit.

In one embodiment, the filter media 152 comprises activated carbon or charcoal to provide (a) one percent (1%) or more formaldehyde gas removal by filter media weight, (b) and less than a 25-30 Pascal pressure drop (e.g., 0.120439 inches of water [4° C.]) at 1 meter per second face air velocity. In one embodiment, the filter media 152 can provide a 0.5%-1% or more formaldehyde gas removal by filter media weight and less than a 20-10 Pascal pressure drop at 1 m/s face air velocity (e.g., 0.080293-0.041463 inches of water [4° C]).).

In one embodiment, the filter 150 can be a low-pressure-drop, flat activated carbon filter (e.g., 5-10 mm thickness or 0.19-0.39 inches). In one embodiment, the filter 150 can be a “deep-V” activated charcoal filter. In one embodiment, the filter 150 can be a low-pressure-drop, pleated activated carbon filter. The activated carbon granules can be attached to a woven or non-woven polymer net structure that results in an open structure in the mesh to improve airflow and granule density, while maintaining granule adhesion. In one embodiment, exemplary filter media 152 employs activated carbon, impregnated with a chemisorbant that targets formaldehyde. Exemplary chemisorbants include tris-hydroxyaminomethyl, solid amine, sodium manganese oxide, ethylene urea and phosphoric acid.

As show in FIG. 3, the filter 150 can be constructed in a “deep-V” configuration. In one embodiment, a deep-V configuration filter 150′ as shown in FIG. 4B can include a shipping position and an operating position or installation position (e.g., FIG. 3). The deep-V configuration of the filter 150′ can provide at least two surfaces that incorporate filter material 152. Thus, a surface area of filter media in the filter 150′ that can pass air therethrough can be located in two places (e.g., to double a filter area) to decrease the pressure at the same airflow or increase the airflow at the same pressure. In either of the two previous examples, the deep-V filter 150′ can increase longevity of the filter or increase the time during which contaminants (e.g., formaldehyde) are effectively removed (e.g., lifetime) of the filter 150′ relative to filter 150.

In one embodiment as shown in FIG. 4B, the filter 150′ includes two filtering side surfaces 156, an air passing bottom surface 157, (e.g., without a pressure drop or filtering), and two relatively thin airflow-blocking end surfaces 158. An exemplary length of the side surface can be approximately equal to or larger than a width of the bottom surface 157. In one embodiment, the shipping position of the filter 150′ is flat or includes substantially two flat top and bottom surfaces.

In one embodiment, the filter 150′ rotatably connects the end surfaces 158 to the bottom surface 157. As shown in FIG. 4B, an edge connection rotatably connects a first side surface 156 at a first offset distance dl from the bottom surface 157, and rotatably connects the second side surface 156 at a second offset distance d2 from the bottom surface 157. The second offset distance d2 can be greater or less than the first offset distance d1. Further, a first connector 159a can connect the side surfaces together and a second connector 159b can connect the end surfaces 158 to the at least one side surface 156 in the installation position. The connectors 159a, 159b such as for example, releasable relatively airtight mechanical connectors such as, but not limited to slit and tab connectors, hook and groove connectors or the like.

In one embodiment, the side surfaces 156 are hingedly connected to the bottom surface 157, and the end surfaces 158 are hingedly connected to the bottom surface 157. In one embodiment, the shipping position of the filter 150′ is flat or includes substantially two parallel top and bottom surfaces. For example, a first parallel surface (e.g., lower) can be provided by the bottom surface 157 and a second parallel surface (e.g., upper) can be provided by the side surface 156. In one embodiment, the filter 150′ can be mounted inside or outside the housing 120.

FIG. 5 is a diagram that shows an embodiment of a transport refrigeration system. As shown in FIG. 5, a transport refrigeration system 500 can include a transport refrigeration unit 510 coupled to a container 512, which can be used with a trailer, an intermodal container, a train railcar, a ship or the like, used for the transportation or storage of goods requiring a temperature controlled environment, such as, for example foodstuffs and medicines (e.g., perishable or frozen). The transport refrigeration unit 510 is configured to maintain a prescribed environment (e.g., thermal, humidity, cargo respiration, presence of gases, presence of chemicals, schedule, or species concentration of the enclosed volume) within the container 512 (e.g., cargo in an enclosed volume). The container 512 can include an enclosed volume 514 for the transport/storage of such goods. The enclosed volume 514 may be an enclosed space having an interior atmosphere isolated from the outside (e.g., ambient atmosphere or conditions) of the container 512.

In one embodiment, the transport refrigeration unit 510 can include a compressor 518, a condenser heat exchanger unit 522, a condenser fan 524, an evaporation heat exchanger unit 526, an evaporation fan 528, and a controller 550. The transport refrigeration unit 510 can include an optional filter 570 that can be selectively coupled to a conditioned airflow exiting the transport refrigeration unit 510.

The compressor 518 can be powered by single phase electric power, three phase electrical power, and/or a diesel engine and can, for example, operate at a constant speed. The compressor 518 may be a scroll compressor, a rotary compressor, a reciprocal compressor, or the like. The transport refrigeration system 500 requires electrical power from, and can be connected to a power supply unit (not shown) such as a standard commercial power service, an external power generation system (e.g., shipboard), a generator (e.g., diesel generator), or the like.

The condenser heat exchanger unit 522 can be operatively coupled to an outlet port of the compressor 518. The evaporator heat exchanger unit 526 can be operatively coupled to an input port of the compressor 518. An expansion valve 530 can be connected between an output of the condenser heat exchanger unit 522 and an input of the evaporator heat exchanger unit 526.

The condenser fan 524 can be positioned to direct an air stream onto the condenser heat exchanger unit 522. The air stream from the condenser fan 524 can allow heat to be removed from the coolant circulating within the condenser heat exchanger unit 522. Alternatively, the condenser 522 can be implemented as a gas cooler.

The evaporator fan 528 can be positioned to direct an air stream onto the evaporation heat exchanger unit 526. The evaporator fan 528 can be located and ducted so as to circulate the air contained within the enclosed volume 514 of the container 512. In one embodiment, the evaporator fan 530 can direct the stream of air across the surface of the evaporator heat exchanger unit 526. Heat can thereby be removed from the air, and the reduced temperature air can be circulated within the enclosed volume 514 of the container 512 to lower the temperature of the enclosed volume 514. As shown in FIG. 5, first and second temperature sensors 424, 422 of the transport refrigeration unit 510 can provide the supply air temperature Ts and the return air temperature Tr to the transport refrigeration unit 510, respectively.

The controller 550 such as, for example, a MicroLink™ 2i controller available from Carrier Corporation of Syracuse, N.Y., USA, can be electrically connected to the compressor 518, the condenser fan 524, and/or the evaporator fan 528. The controller 550 can be configured to operate the transport refrigeration unit 510 to maintain a predetermined environment (e.g., thermal environment) within the enclosed volume 514 of the container 512. The controller 550 can maintain the predetermined environment by selectively controlling modes of operation, or operations of one or more components of the transport refrigeration unit 510.

In one embodiment, the filter 570 is constructed from four major elements including filter media, a cover web on either side of the filter media, and filter frame. The filter media has been specifically designed to increase or maximize ethylene gas removal capabilities while reducing or minimizing pressure drop characteristics or satisfying airflow requirement of the transport refrigeration unit. In one embodiment, exemplary filter media in the filter 570 employs activated carbon or charcoal, impregnated with a catalyst that targets ethylene. An exemplary catalyst for the filter 570 can be palladium.

In one embodiment, the filter 570 can be configured to be mounted through a thermal wall or barrier separating the transport refrigeration unit 510 into a first conditioned portion (e.g., housing the evaporator) and a second ambient portion. In this configuration, the filter 570 can be accessed (e.g., removed or changed) through a door or access panel on the ambient side of the transport refrigeration unit 510. For example, the filter 570 can be accessed without exposing the conditioned side of the transport refrigeration unit 510 or disconnecting the transport refrigeration unit 510 from the cargo.

In one embodiment, the filter 570 can be mounted in a stand-alone unit configured to operate in the enclosed space 514 or the container 512.

In one embodiment, the filter 570 can be mounted in a prescribed passage or duct configured to selectively pass a portion of the conditioned air to be output by the transport refrigeration unit 510. When the passageway is open, conditioned air impinges the filter 570, and filtered conditioned air is output by the transport refrigeration unit 510. When the passageway is closed, conditioned air does not impinge the filter 570.

An embodiment of a method of operating a transport refrigeration system according to the application will now be described. The method embodiment shown in FIG. 6, can be implemented in and will be described using a transport refrigeration system embodiment shown in FIG. 5, however, the method embodiment is not intended to be limited thereby.

As shown in FIG. 6, after a process starts, a sensor reading such as concentration of gas (e.g., Gs) is obtained (operation block 610). In one embodiment, the gas concentration of gas can be ethylene measured by a sensor 560 mounted in the transport refrigeration unit 510 or a remote sensor 562 mounted in the enclosed space 514. Then, the sensor reading can be compared to a corresponding selected threshold value or range (e.g., G1) for the concentration of gas (operation block 320). In one embodiment, when the sensor reading Gs is less than or equal to the selected value (G1) or within a selected range, an operations mode of the transport refrigeration system 510 is entered (operation block 630). Otherwise, a filtering mode of the transport refrigeration unit 510 is entered (operation block 640). From either operation block 630 or operations block 640, control can jump back to repeatedly obtain and compare the sensor reading (operations blocks 610, 620) until the process ends.

In the embodiment of a method of operating a transport refrigeration unit of FIG. 6, an ethylene gas concentration sensor reading can be repeatedly compared to a selected operating range. For example, the repeated sensor reading can be determined periodically, aperiodically, intermittently, checked once per second while operating in a first mode, checked one per minute when operating in a second mode, based on prescribed criteria or responsive to an operator action. Accordingly, embodiments of the application can control or use ethylene characteristics for reducing or preventing damage (e.g., spoilage) or to control ripening to cargo such as perishable goods in transit.

In one embodiment, the filter 570 can be mounted in a prescribed passage or duct configured to pass a portion of the supply air discharged to the enclosed space 514. Thus, in a first mode (e.g., selected by the controller 550), the prescribed passage is opened and the filter 570 can operate to remove ethylene from the air (e.g., conditioned air) impinging filter 570 and passing therethrough. In a second mode (e.g., selected by the controller 550), the prescribed passage is closed and the filter 570 is prevented from removing ethylene or significantly affecting levels of ethylene in the container 512 or in the conditioned air output by the transport refrigeration unit 510. In one embodiment, the filter 570 can be configured to cover an outlet port discharging supply air to the enclosed space 514 or to cover an inlet port conveying return air from the enclosed space 510 to the transport refrigeration unit 510.

Although embodiments of the application have described an integrated sensor or a remote cargo sensor as capable of monitoring gas levels of the cargo (e.g., directly or indirectly), embodiments of the application are not intended to be so limited. For example, the remote cargo sensor may monitor other transport container characteristics such as temperature, humidity, species concentration (e.g., CO, O₃, CO₂, N₂, or the like), cargo respiration, or similar ambient conditions outside the container. Such monitoring can result in controlling (e.g., by the controller 550 or refrigeration unit 510) the monitored characteristic to be below a selected value or within a selected range as known to one skilled in the art. For example, if a CO₂ level were too high in the container, outdoor air can replace a portion of the enclosed volume of air to reduce the CO₂ level until it is considered appropriate again.

The container 512 illustrated in FIG. 5 may be towed by a semi-truck for road transport. However, those having ordinary skill in the art will appreciate that exemplary containers according to embodiments of the application is not limited to such trailers and may encompass, by way of example only and not by way of limitation, trailers adapted for piggy-back use, railroad cars, and container bodies contemplated for land and sea service.

Components of the transport refrigeration unit (e.g., motors, fans, sensors), as known to one skilled in the art, can communicate with a controller (e.g., transport refrigeration unit 10) through wire or wireless communications. For example, wireless communications can include one or more radio transceivers such as one or more of 802.11 radio transceiver, Bluetooth radio transceiver, GSM/GPS radio transceiver or WIMAX (802.16) radio transceiver. Information collected by sensor and components can be used as input parameters for a controller to control various components in transport refrigeration systems. In one embodiment, sensors may monitor additional criteria such as humidity, species concentration or the like in the container.

Embodiments of the application have been described herein with reference to a heat evaporation type heat exchanger. However, embodiments of the application are not intended to be so limited. For example, a heat absorption type heat exchanger can replace a heat evaporation type heat exchanger. Further, circulating fluid heat exchanges can replace fans (e.g., condenser fan).

While the present invention has been described with reference to a number of specific embodiments, it will be understood that the true spirit and scope of the invention should be determined only with respect to claims that can be supported by the present specification. Further, while in numerous cases herein wherein systems and apparatuses and methods are described as having a certain number of elements it will be understood that such systems, apparatuses and methods can be practiced with fewer than the mentioned certain number of elements. Also, while a number of particular embodiments have been set forth, it will be understood that features and aspects that have been described with reference to each particular embodiment can be used with each remaining particularly set forth embodiment. For example, aspects and/or features of embodiments described with respect to FIG. 5 can be combined with aspects or features of embodiments described with respect to FIG. 6.

Claims

1. A building terminal fan coil unit comprising: an airflow inlet opening and an airflow outlet opening in an enclosure;a fan disposed in the enclosure, and operable to cause air to flow into the airflow inlet opening and out of the airflow outlet opening;a heat exchanger positioned inside the enclosure so that the airflow will pass therethrough; anda gas removal filter positioned so that the airflow will pass therethrough, said filter operable to provide a physical material removal capability and a formaldehyde gas removal capability.

2. The building terminal fan coil unit of claim 1, said filter operable to provide a biocide capability.

3. The building terminal fan coil unit of claim 1, where the filter is flat.

4. The building terminal fan coil unit of claim 1, where the filter has a deep-V configuration.

5. The building terminal fan coil unit of claim 1, where the filter is pleated.

6. The building terminal fan coil unit of claim 1, where the filter is mounted inside or outside the enclosure, the formaldehyde gas removal capability to provide one percent (1%) or more formaldehyde gas removal by filter media weight and less than a 30 Pascal pressure drop at a face airflow rate of 1 msec.

7. The building terminal fan coil unit of claim 1, where the filter is mounted to cover the airflow inlet opening or the airflow outlet opening.

8. The building terminal fan coil unit of claim 1, where the airflow inlet opening is in one or more side walls of the housing above a false ceiling, where the airflow inlet opening includes a plurality of openings, when the airflow outlet opening includes a plurality of outlet openings.

9. Apparatus for controlling ethylene concentration to perishable goods in a mobile container having a refrigeration module for delivering conditioned air into the container, said apparatus comprising: a refrigeration unit including: an outlet port to supply air from the refrigeration unit;an inlet port to return air to the refrigeration unit;at least one filter to remove ethylene gas mounted at the refrigeration unit; anda controller coupled to control operation of the refrigeration unit.

10. The apparatus of claim 9, comprising at least one sensor unit to detect an ethylene gas level.

11. The apparatus of claim 10, the filter mounted in the container area.

12. The apparatus of claim 10, the filter mounted in a configurable passageway that can be selectively connected between the outlet port and the inlet port.

13. The apparatus of claim 12, where the filter is accessed through a panel door at an ambient side of the refrigeration unit.

14. The apparatus of claim 10, where the sensor unit is in the refrigeration unit or the container.

15. A method of operating a transport refrigeration unit, comprising: determining an ethylene gas level;comparing said ethylene gas level to a corresponding threshold value;entering a filtering mode of said transport refrigeration unit to reduce the ethylene gas level when the ethylene gas level is greater than the threshold value; andexiting the filtering mode of the transport refrigeration unit when the ethylene gas level is less than the threshold value.

16. The method of claim 15, wherein said filtering mode passes a portion of supply air provided by the transportation refrigeration unit through a filter treated with a catalyst for ethylene decomposition.

17. The method of claim 15, wherein said sensing activates a filtering unit separate from the transport refrigeration unit, the filtering unit to include a filter treated with a catalyst for ethylene.