Systems with multi-circuited, phase-change composite heat exchangers

A system configured to cool an indoor airflow of a building, the system comprising:

• a first plurality of tubes connected to a first circuit comprising a first fluid configured to thermally contact the indoor airflow via a first coil;
• a second plurality of tubes connected to a second circuit comprising a second fluid and a condenser;
• and
• a heat exchanger comprising the first plurality of tubes and the second plurality of tubes;
• a phase change composite in thermal communication with the first plurality of tubes and in thermal communication with the second plurality of tubes;
• wherein:
• the first fluid is configured to remove heat from the indoor airflow and release heat to the phase change composite via the heat exchanger,
• the phase change composite is configured to remove heat from the first fluid and either store heat or transfer heat to the second fluid,
• the first plurality of tubes and the second plurality of tubes are wrapped around the phase change composite,
• the condenser is configured to be in thermal contact with an external ambient,
• the condenser is configured to release heat to the external ambient, and
• a fan is configured to direct the indoor airflow to the building after the indoor airflow has been cooled by the first fluid.