Method and system for controlling condenser/radiator airflow

A method of controlling condenser/radiator airflow in a transport refrigeration system for a refrigerated transport unit, wherein the transport refrigeration system includes a transport refrigeration unit that includes a condenser fan that discharges air out of the transport refrigeration unit from an outlet of the condenser fan into the environment while in transport, the method comprising:

• measuring a condenser/radiator performance parameter of at least one of a condenser or a radiator of the transport refrigeration system to determine a static air pressure at the outlet of the condenser fan caused by ambient air passing over the outlet while the refrigerated transport unit is in transport;
• comparing the condenser/radiator performance parameter to a condenser/radiator performance threshold to determine whether the static air pressure at the outlet of the condenser fan negatively impacts performance of the transport refrigeration unit;
• and
• increasing a fan speed of a condenser fan when the measured condenser/radiator performance parameter exceeds the condenser/radiator performance threshold to decrease the static air pressure at the outlet of the condenser fan caused by the ambient air passing over the outlet while the refrigerated transport unit is in transport.

A method of controlling condenser/radiator airflow in a transport refrigeration system for a refrigerated transport unit, wherein the transport refrigeration system includes a transport refrigeration unit that includes a condenser fan that discharges air out of the transport refrigeration unit from an outlet of the condenser fan into the environment while in transport, the method comprising:

• measuring a travelling speed of the transport refrigeration system to determine a static air pressure at the outlet of the condenser fan caused by ambient air passing over the outlet while the refrigerated transport unit is in transport;
• comparing the travelling speed of the transport refrigeration system to a transport refrigeration system travelling speed threshold value to determine whether the static air pressure at the outlet of the condenser fan negatively impacts performance of the transport refrigeration unit;
• and
• increasing a fan speed of a condenser fan of the transport refrigeration system when the measured travelling speed of the transport refrigeration system exceeds the transport refrigeration system travelling speed threshold value for a set time period to decrease the static air pressure at the outlet of the condenser fan caused by the ambient air passing over the outlet while the refrigerated transport unit is in transport.

A method of controlling condenser/radiator airflow in a transport refrigeration system for a refrigerated transport unit, wherein the transport refrigeration system includes a transport refrigeration unit that includes a condenser fan that discharges air out of the transport refrigeration unit from an outlet of the condenser fan into the environment while in transport, the method comprising:

• measuring a compressor discharge pressure of a compressor of the transport refrigeration system to determine a static air pressure at the outlet of the condenser fan caused by ambient air passing over the outlet while the refrigerated transport unit is in transport;
• comparing the compressor discharge pressure to a compressor discharge pressure range to determine whether the static air pressure at the outlet of the condenser fan negatively impacts performance of the transport refrigeration unit;
• and
• increasing a fan speed of the condenser fan when the compressor discharge pressure exceeds outside the compressor discharge pressure range to decrease the static air pressure at the outlet of the condenser fan caused by the ambient air passing over the outlet while the refrigerated transport unit is in transport.

A transport refrigeration system, comprising:

• a refrigeration circuit, the refrigeration circuit including:
• a compressor,
• an evaporator,
• a condenser, and
• a throttling valve;
• a condenser fan configured to discharge air out of the transport refrigeration system from an outlet of the condenser fan into the environment while in transport;
• and
• a controller, the controller configured to:
• control the refrigeration circuit and a fan speed of the condenser fan,
• determine a static air pressure at the outlet of the condenser fan based on an airflow performance value,
• compare the airflow performance value to an airflow performance threshold to determine whether the static air pressure at the outlet of the condenser fan negatively impacts performance of the transport refrigeration system, and
• increase fan speed of the condenser fan when the airflow performance value extends past the airflow performance threshold to decrease the static air pressure at the outlet of the condenser fan.