Business concepts
understand the concept of business enterprise and types of businesses.
state different sources and types of finances.
Maintenance and testing
list the types of tests and maintenance on a refrigeration system.
carry out tests and maintenance on refrigeration systems.
Liquid receiver and service valve
differentiate the types of the liquid receivers and service valves (accumulator).
state the purposes and functions of liquid receivers and service valves.
explain the principle of operation of liquid receiver and service valves.
service and repair liquid receivers and service valves.
Forms of refrigeration
list the forms of refrigeration
state the application of the variousforms of refrigeration.
explain the principle of operation of absorption system.
state the functions of the components and accessories.
Insulation of air condition and refrigeration system
state the need for insulating refrigerator and air-conditioners.
identify insulating materials for refrigeration and air-condition system.
state the properties of insulating material for refrigeration and air-conditioners.
insulate refrigerator and air-conditioners.
Piping, Ducting and Trunking
differentiate between piping, ducting and trucking.
select the appropriate tools and materials to carry out piping, ducting and trucking.
Fault Diagnosis and troubleshooting
state the different methods of diagnosing fault in refrigeration and air-conditioning systems.
select the appropriate methods to diagnose fault in a given system.
effect repairs on faulty systems.
trouble shooting a given system.
Evaporators and condensers
explain the concept of pressure.
state the units of measuring pressure.
describedifferent typesof pressure measuring devices.
measure pressure using appropriate measuring instrument
Refrigerant flow control
list the different types of refrigerant flow controls and their applications.
describe the construction of refrigerant flow controls.
explaln the operations of various flow controls.
install and service refrigerant flow controls.
Air conditioning processes
state the psychometric properties of air.
explain air conditioning processes: heating, cooling, humidification, air cleaning and filtering.
differentiate between latent heat and sensible heat, saturated air
read property diagram.
International practical temperature and pressure values
list the acceptable international practical values of temperature and pressure for oxygen and water;
state uses of suction and high pressure gauges;
use suction and high pressure gauges to determine the performance of refrigerants in the refrigeration
system.
Power
explain the meaning of power and state its unit
calculate power used by a compressor
Energy
define heat energy.
explain the meaning of enthalpy in fluid, and its relationship with pressure, volume, and temperature as well as internal energy;
draw and explain the p.h diagram ofrefricerant
Servicing an air conditioner
List five basic tools and state their uses.
Basic Tools used in Refrigeration and Air conditioning System
identify, select and use basic tools in refrigeration and air- conditioning work.
Evaporators
state the types, function of evaporators.
describe the construction of evaporators.
explain the working principles of evaporator.
Compressors
state the types, and functions of reciprocating, rotaryand screws centrifugal compressors etc.
describe the construction of com pressors.
explain the basic working of compressors.
Refridgerants
define refrigerant
identify the different types of refrigerants using the colour code.
state the properties and uses of refrigerants.
state the chemical name and formulae of refrigerants e.g organic, hydrocarbons, mixtures, secondary etc
Introduction to Refridgeration
describe the refrigeration cycle.
draw layout diagrams of a basic refrigeration systems example: fridge.
Temperature and pressure
state the effects of temperature, pressure and volume on refrigeration and air-conditioning system.
state Gas laws, Boyies law, Charles law and Dalton law.
demonstrate calculations involving gas law formulae.