A data center system, the 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 and external to the plurality of electronic racks, or external to 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 situated external to the housing 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 outside of the housing, to cause the airflow to travel through the servers of the plurality of 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, wherein the CDU comprises: a liquid pump to pump the cooler liquid into a heat removal liquid manifold; a pump controller coupled to the liquid pump; and a liquid reservoir coupled to the liquid pump; wherein the pump controller controls liquid flow rate based on a workload of the IT components. 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 and external to the plurality of electronic racks, or external to 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 situated external to the housing 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 outside of the housing, to cause the airflow to travel through the servers of the plurality of 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, wherein the CDU comprises: a liquid pump to pump the cooler liquid into a heat removal liquid manifold; a pump controller coupled to the liquid pump; and a liquid reservoir coupled to the liquid pump; wherein the pump controller controls liquid flow rate based on a workload of the IT components. a liquid pump to pump the cooler liquid into a heat removal liquid manifold; a pump controller coupled to the liquid pump; and a liquid reservoir coupled to the liquid pump; wherein the pump controller controls liquid flow rate based on a workload of the IT components. <EOS>