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Thermonics Low Temp. Chillers - Glossary A

Absolute Zero

Absolute zero is the bottom limit of the thermodynamic temperature scale. It is the point at which all thermal motion ceases; a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum values. At this point, the fundamental particles of nature have minimal vibrational motion, retaining only quantum mechanical particle motion. It is the zero point on the Kelvin scale (-273.15°C or -459.67°F)


An actuator is the component of a system that is responsible for moving or controlling a mechanism in that system. Actuators uses a control signal (electric current, computer command, pneumatic or hydraulic pressure, human power) and a source of energy (electric current, hydraulic or pneumatic pressure). When the control signal is received, the actuator responds by converting that energy into mechanical motion.

Air-Cooled Chiller

Air Cooled Chillers use Ambient Air to remove heat from the system; typically using Fans or CDA (Clean Dry Air) streams to pass air over Condenser Coils; removing heat from the condensing Refrigerant and rejecting the Heat to the surrounding atmosphere. Generally used for small to medium applications requiring two hundred tons of cooling or less.

Ambient Temperature Range

Ambient Temperature is the Temperature of the Environment that surrounds, or is outside of the Process/Cooling Medium. Standard Ambient Temperature is generally considered to be 25 °C, (77 °F/298.15 K) at an absolute pressure of 1 atm.


The American National Standards Institute (ANSI) is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, and systems in the United States. The organization also coordinates U.S. standards with International standards so that American products can be consumed worldwide. ANSI accredits standards that are developed by representatives of other standards organizations, many of which, whose standards are applicable to the design, manufacture and documentation of state-of-the-art Chiller Equipment, are discussed in this Glossary.


Argon is an inert gas naturally found in the atmosphere, and easily produced as a byproduct of cryogenic air separation. In the Chiller Industry, Argon is used as a Heat Transfer Medium in Gas Chillers.

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