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Industrial Water Chiller Systems

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Chiller and Cooling Terminology

Launa Albrecht · Mar 10, 2020 ·

Knowing What You Need Means Understanding All of the Terms

At North Slope Chillers, we want you to feel as informed and prepared as possible. Choosing a cooling system can seem like a daunting process. We are here to make sure you have all the knowledge you need to make an informed decision.

Learn More about Chiller solutions

Get Ready for the Chiller Vocabulary Quiz

Below are the terms that we use to explain and define all of the aspects of cooing and chillers.

AIR COOLED CHILLERS: A class of vapor compression chillers that use forced air to remove unwanted heat from a system. 

AMBIENT TEMPERATURE: The surrounding temperature of a system

BRAZED PLATE HEAT EXCHANGER: An extremely efficient heat transfer unit made of a stack of metal plates that create a series of fluid paths. As the process fluid and refrigerant pass over each individual plate, heat is exchanged from 1 fluid to the other.

BRITISH THERMAL UNIT (BTU): The amount of energy needed to raise the temperature of 1 pound of water by 1°F at sea level. BTUS are used wherever standard measurements (pounds, inches, farenheit) are used.

CENTRIFUGAL COMPRESSOR: A type of compressor that uses rotating impellers to compress and push refrigerant around the refrigeration circuit

CHILLER: A mechanical device used to remove heat from a fluid

COMPRESSOR: A device that compresses the refrigerant and increases its pressure

CONDENSER: A device that removes heat and condenses refrigerant from a gas into a liquid

CONDENSER FAN: A fan in an air cooled chiller that forces air over the coils of the condenser and removes unwanted heat from the refrigerant

COOLING CAPACITY: The measured ability of a cooling system to remove heat

COOLING TOWER: A device in a water cooled chiller that uses a stream of water to extract unwanted heat from a system

COEFFICIENT OF PERFORMANCE (COP): A measurement of how efficiently your system is removing heat. Higher COP measurements = lower operating costs

DEIONIZED WATER: Specialized water that has been stripped of elemental ion impurities. Deionized water is used in deionized chillers for specialized applications such as cooling equipment for lasers and EDM (electrical discharge machining).

EVAPORATOR: A device in which the refrigerant changes from a liquid into a gas as it absorbs heat

FILL PORT: An opening in a chiller where fluid is added directly into the reservoir

FILTER: A device that removes particulates from the air

FLOW RATE: the amount of fluid moving through a system; usually measured in gallons or liters per minute. A chiller would have 2 different flow rates, 1 for the refrigeration circuit, 1 for the fluid circuit.

FLUID CIRCUIT: The circuit that moves process fluid through the chiller

FLUID LEVEL INDICATOR: A gauge that helps prevent internal damage to the chiller by measuring how much fluid is in the reservoir

FLUXWRAPTM: A proprietary, multi-channel, fluid wrap that circulates process fluid around an object; can be used to transfer heat to or from an object as needed. 

GLYCOL: Propylene and ethylene glycol are chemical antifreezes. Glycol is added to water to decrease its freezing point, prevent bacterial growth, and reduce corrosion. 

HEAT EXCHANGER: A device that transfers heat between the process fluid and the refrigerant.

PRESSURE GAUGE: the pressure gauge is tied into the fluid outlet of the chiller. During operation it will tell you what the pressure is exiting the chiller

PROCESS COOLING: using a chiller or refrigeration unit to remove heat from a process

PROCESS FLUID: a mixture of water a glycol that flows through the fluid circuit of a chiller

PROCESS FLUID RESERVOIR: a container that holds the process fluid inside a chiller

PUMP: A device that moves the process fluid through the chiller

RECIPROCATING COMPRESSOR: A type of compressor that uses pistons and chambers that increases the pressure of the refrigerant

REFRIGERATION CIRCUIT: The system that moves refrigerant around the chiller

REFRIGERANT: A compound of chemicals that transfer heat from one area to another within the refrigeration cycle; specifically designed to evaporate and condense at set temperatures and pressures

SET POINT: this is the desired temperature of the fluid exiting the chiller

SCREW COMPRESSOR: A type of compressor that uses interlocking helical rotors to compress the refrigerant

SCROLL COMPRESSOR: A type of compressor that uses 2 spiral plates (1 rotating, 1 fixed) to compress the refrigerant

SUBMERGED COPPER COIL: A type of heat exchanger where fluid is pumped through a copper coil that is dropped directly into the fluid being cooled

SUCTION ACCUMULATOR: A device that absorbs moisture to prevent liquid refrigerant from entering the compressor (which is only designed to handle gas) 

TEMPERATURE CONTROLLER: A device that actively monitors fluid temperature and will turn on and off the refrigeration circuit as needed to maintain the desired fluid temperature

TEMPERATURE DIFFERENTIAL: The difference between the current temperature of your water and the needed temperature of your water

THERMAL EXPANSION VALVE (TXV): A device that measures the superheated temperature of the refrigerant and controls how quickly it is allowed to flow into the evaporator.

VAPOR ABSORPTION CHILLER: A type of chiller that uses an absorber and generator to produce suction and compression in the refrigerant; typically has a larger footprint than vapor compression chillers

VAPOR COMPRESSION: A type of chiller that uses an evaporator and compressor to produce pressure in the refrigerant.

WATER COOLED CHILLERS: A class of vapor compression chillers that uses water circulating through a cooling tower to remove unwanted heat from a system.

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Salt Lake City, UT 84104
Phone: (866) 826-2993
Email: [email protected]

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