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51

Competency and Task List

Commercial Refrigeration

Students should have

prior knowledge of:

The laws of Thermodynamics

Recovery and recycling processes

Refrigerant leak detection and types of leak detectors

Refrigerant piping

Soldering and brazing

Refrigerant types

Leak detectors

Students must have

knowledge of light

commercial refrigeration

systems, their

components, and be able

to demonstrate

proficiency in:

Defining enthalpy and entropy

Change of state between liquids, vapor, and solids

Describing and defining the following; conduction, convection and radiant heat transfer

Describing, defining, and converting the following temperature measurements;

Fahrenheit, Celsius, Rankine, and Kelvin

Condensation of a vapor, and its effect on heat

Vaporization of a liquid, and its effect on heat

Describing the thermodynamics of refrigerants

Define Cryogenics

Define and state the applications of High, Medium, and Low temperature refrigeration

Define “Expendable Refrigerant”

Describing and defining the following; BTU, latent heat, sensible heat

Describing and defining the following; subcooled liquid, superheated vapor

Describing the state of refrigerant, and explain what occurs in each major component

during normal operation

Using saturation tables

Identifying and defining the following types of blends; Binary, Ternary, Azeotropic, and

Near Azeotropic

Identifying and defining; CFC’s, HCFC’s, HFC’s, HFO's & HC's

Describing temperature glide

Describing fractionation and its causes

Explain the procedures to retrofit a system from a CFC to an HFC, & an HCFC to an HFC

Describing and defining the following; wet bulb temperature, dry bulb temperature, and

dew point

Defining wet bulb depression

Measuring wet and dry-bulb temperatures

Describing the principles of dehumidification and humidification

Define and explain the use of high humidity evaporator coils