IPA: /ˈsʌbˌkuːl/
KK: /sʌbˈkuːl/
To lower the temperature of a liquid refrigerant below its saturation point without changing its state.
The technician decided to subcool the refrigerant to improve the system's efficiency.
Past: subcooled
Past Participle: subcooled
Subcool → It is formed from "sub-" (meaning under or below) and "cool" (from Old English "ceald", meaning not warm). The word "subcool" refers to a temperature that is below the normal cooling point.
Think of being 'under' ('sub-') the normal temperature, which is why 'subcool' means to be cooler than usual.