Devices and methods of optimizing refrigerant flow in a heat exchanger

A heat exchanger unit comprising:

• a plurality of heat exchanger coils, wherein (i) a first heat exchanger coil of the plurality of heat exchanger coils is disposed at a first location such that the first heat exchanger coil experiences a first airflow of air passing over the first heat exchanger coil and (ii) a second heat exchanger coil of the plurality of heat exchanger coils is disposed at a second location such that the second heat exchanger coil experiences a second airflow of air passing over the second heat exchanger coil, the first airflow being less than the second airflow;
• a plurality of distributor tubes, wherein individual ones of the plurality of distributor tubes (i) being in fluid communication with a corresponding heat exchanger coil of the plurality of heat exchanger coils and (ii) being configured to direct a flow of refrigerant from an expansion valve to the corresponding heat exchanger coil of the plurality of heat exchanger coils, and
• wherein a first distributor tube of the plurality of distributor tubes extends between the expansion valve and the first heat exchanger coil and comprises one or more constrictions, the first distributor tube has a first cross-sectional area along a majority of an overall length of the first distributor tube, the one or more constrictions has a second cross-sectional area that is less than the first cross-sectional area, and the first distributor tube is configured to reduce a flow rate of refrigerant from the expansion valve to the first heat exchanger coil such that (i) a greater amount of refrigerant is directed to the second heat exchanger coil of the plurality of heat exchanger coils and (ii) refrigerant exits each heat exchanger coil of the plurality of heat exchanger coils as a superheated vapor refrigerant;
• wherein the first distributor tube of the plurality of distributor tubes comprises a first number of bends that is greater than a second number of bends in a second distributor tube of the plurality of distributor tubes, and
• wherein the second distributor tube is shorter than the first distributor tube and a third distributor tube of the plurality of distributor tubes, the third distributor tube being in fluid communication with a third heat exchanger coil of the plurality of heat exchanger coils.