This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. An agent that produces cooling, especially a fluid that draws off heat by circulating through an engine or by bathing a mechanical part.

n. A medium, usually fluid, used to draw heat from an object.

n. a fluid (gas or liquid) used to cool a device by transferring heat away from one part to another.

n. a fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transferring heat away from one part to another

"ALSO … many large facilities use adsorption air conditioners already (and duh the array can be used for heating as well), they could be taking the coolant from the concentrated PV array and using it to provide MOST of the input energy for their HVAC systems."

fluid    agent   

esculent   

refrigerant    high-pressure    lubricant    Freon    hydraulic    exhaust    propane    propellant    helium    suction