Abstract: Methods and systems for controlling noise generated by a transport climate control system (TCCS) that provides climate control within a climate controlled space of a transport unit are disclosed. The methods and systems include a controller obtaining a noise tolerance, wherein the noise tolerance is a threshold noise level that includes at least a noise level generated by the TCCS; the controller monitoring the noise level generated by the TCCS; the controller comparing the noise tolerance with the noise level generated by the TCCS; upon the controller determining that the noise level generated by the TCCS is greater than the noise tolerance, the controller determining a target operating condition of the TCCS for matching the noise level generated by the TCCS with the noise tolerance; and the controller adjusting the TCCS to the target operating condition to adjust the noise level generated by the TCCS.

Abstract: Methods, systems and apparatuses configured to isolate and/or damp vibration of refrigerant lines caused by, for example, the compressor are disclosed. A vibration control device can be configured hold a refrigerant line at a position that is away from the compressor. The vibration control device can help isolate the vibration, reducing or preventing the vibration from passing the vibration control device along the refrigerant line. A vibration-damping device can be configured to engage the refrigerant line so as to absorb/damp the vibration of the refrigerant line.

Abstract: Apparatuses and methods to attenuate acoustic waves are provided. The method may include shifting the phases of a plurality of portions of the acoustic waves and merging the portions of the acoustic waves after phase shifting. Because, for example, the phases of the acoustic waves may be out-of-sync when being merged, the acoustic waves may be attenuated. A muffler incorporating the method of attenuating acoustic waves can include a plurality of acoustic paths, each of which may have different acoustic impedance and/or length. The acoustic paths may help the acoustic waves have out-of-sync phases after the acoustic waves passing through the acoustic paths, resulting in acoustic wave attenuation.

Abstract: Embodiments to help improve an airflow using e.g., an airflow director, an aerodynamic tail, etc. for a transport unit are disclosed. Structures and methods herein are related to directing airflow to low pressure areas in relation to the transport unit which can improve energy efficiency, counter turbulent airflows, and/or reduce drag. Surface features, such as one or more openings, louvers, tunnels, baffles, air directors, deflectors, inverters, etc. are strategically arranged or positioned on the aerodynamic faring to help direct an airflow toward a transport refrigeration unit when the temperature controlled transport unit is in motion. An aerodynamic tail can direct an airflow to a relatively low pressure region at a rear end of the transport unit when the transport unit is in motion to reduce or eliminate the relatively low pressure region. The features may be stored within a storage structure attached to a rear door of the transport unit.

Abstract: Methods, systems and apparatuses configured to isolate and/or damp vibration of refrigerant lines caused by, for example, the compressor are disclosed. A vibration control device can be configured hold a refrigerant line at a position that is away from the compressor. The vibration control device can help isolate the vibration, reducing or preventing the vibration from passing the vibration control device along the refrigerant line. A vibration-damping device can be configured to engage the refrigerant line so as to absorb/damp the vibration of the refrigerant line.

Abstract: Apparatuses and methods to attenuate acoustic waves are provided. The method may include shifting the phases of a plurality of portions of the acoustic waves and merging the portions of the acoustic waves after phase shifting. Because, for example, the phases of the acoustic waves may be out-of-sync when being merged, the acoustic waves may be attenuated. A muffler incorporating the method of attenuating acoustic waves can include a plurality of acoustic paths, each of which may have different acoustic impedance and/or length. The acoustic paths may help the acoustic waves have out-of-sync phases after the acoustic waves passing through the acoustic paths, resulting in acoustic wave attenuation.

Abstract: A multi-stage low pressure drop muffler for a compressor including a first plate having a hole, a tube attached to the first plate, a plurality of holes disposed around the circumference of the tube, a plurality of tubes extending through a second plate, and an internal ring disposed on the second plate between the center of the second plate and the plurality of tubes. The muffler is designed to muffle a wide range of frequencies, minimize pressure reduction, improve fluid flow, and improve compressor efficiency.

Abstract: A sound-abating flow disruptor quiets a PTAC refrigerant system by disturbing the airflow between an energized electric heater and an adjacent fan wheel. In some embodiments, the flow disruptor is a perforated metal plate that attenuates a whistle, which appears to be caused by vortex shedding in the confined area between the energized heater and the fan. In some cases, the heater comprises selectively energizable heating elements of various wattage. The heating elements closest to the fan wheel are the lower wattage ones to minimize the heat near the fan.

Abstract: A sound-abating flow disruptor quiets a PTAC refrigerant system by disturbing the airflow between an energized electric heater and an adjacent fan wheel. In some embodiments, the flow disruptor is a perforated metal plate that attenuates a whistle, which appears to be caused by vortex shedding in the confined area between the energized heater and the fan. In some cases, the heater comprises selectively energizable heating elements of various wattage. The heating elements closest to the fan wheel are the lower wattage ones to minimize the heat near the fan.