Implementing a front door air to water heat exchanger

A system for air to liquid cooling of electronic equipment enclosures, the system comprising:

• an enclosure configured for holding electronics and including front and rear doors;
• air to liquid heat exchangers housed within each of the front and rear doors;
• separate supply lines configured with control valves and flow control sensors that provide liquid coolant to each of air to liquid heat exchangers;
• a plurality of temperature sensors;
• separate return lines configured with one of the plurality of the temperature sensors for exiting coolant from each of the air to liquid heat exchangers;
• separate air purging valves for each of the supply and return lines;
• spray shields affixed to the front door and spray shields fit over connections between the supply and return lines, the spray shields being disposed and configured to prevent liquid coolant from entering an inlet airflow and to protect the electronics from liquid coolant in an event the liquid coolant leaks from the supply and return or air the purging valves, the spray shield being at least one or both of transparent and spring-loaded;
• and
• wherein the control valves are actuated by a central controller in response to readings from the plurality of the temperature sensors and the flow control sensors to separately control liquid coolant flow to each of the air to liquid heat exchangers.