Systems and methods for improving the boiling heat transfer of a heat transfer coil

A system for improving the heat transfer of a heat exchanger coil of a heating, ventilation, and air conditioning (HVAC) system, the heat exchanger coil comprising an outer diameter and an inner diameter configured to contain a refrigerant fluid and to exchange thermal energy with the refrigerant fluid, the inner diameter having a first surface area and a first amount of nucleate boiling sites, the system comprising:

• an etching solution;
• and
• a pump in fluid communication with the heat exchanger coil and configured to pump the etching solution through the heat exchanger coil,
• wherein pumping the etching solution through the heat exchanger coil using the pump results in the inner diameter of the heat exchanger having a second surface area larger than the first surface area and a second amount of nucleate boiling sites larger than the first amount of nucleate boiling sites.

A heat exchanger coil of a heating, ventilation, and air conditioning (HVAC) system, the heat exchanger coil comprising:

• a first end configured to couple to a primary end of the HVAC system, the HVAC system comprising a compressor, an expansion valve, tubing, and a second heat exchanger;
• a second end configured to couple to a secondary end of the HVAC system;
• and
• a tubular body extending between the first end and the second end and having an inner surface and an outer surface, the tubular body configured to contain and exchange thermal energy with a refrigerant fluid,
• wherein the interior surface of the tubular body comprises an etched surface having a plurality of peaks and a plurality of valleys.