Fan-less chiller-less liquid-air cooling for electronic racks of it components in data centers

A data center system, comprising:

• a housing to house a plurality of electronic racks of information technology (IT) components operating therein;
• a coolant distribution unit (CDU) situated within the housing to control a liquid flow of a cooling liquid;
• one or more cooling devices disposed on the IT components to receive a first liquid from the CDU, to exchange heat generated from the IT components using the first liquid, to transform the first liquid into a second liquid with a higher temperature, and to transmit the second liquid carrying the exchanged heat back to the CDU to form a first liquid loop, wherein the one or more CDUs couples the first liquid loop to a heat dissipating system to carry the exchanged heat to the external environment outside of the housing without a chiller unit;
• and
• an airflow delivery system to generate an airflow from a cooler/colder external environment, to cause the airflow to travel through the servers of the electronic racks to exchange heat generated by the servers due to operations of the servers, and to exhaust the airflow carrying the exchanged heat back to the external environment outside of the housing.