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Hvac

Basic Components of Refrigeration system

Compressors

Types of Compressors:

Reciprocating compressors:

Scroll Compressor:

Intake phase of Scroll compressor:

Compression phase of scroll compressor

Scroll Compressor

Helical – Rotary (Screw) Compressors:

Helical Rotary Compressor

Centrifugal Compressor

Open Compressor

Hermatic Compressor:

Semi hermetic compressor

Cylinder Unloaders:

Cycling on and off: Cycling scroll Compressors Slide Valve Inlet vanes Variable Speed:

Condenser Refrigeration Cycle Air Cooled Condensers

Effect of Sub cooling

Types of Air – cooled condensers

Evaporator condenser

Water Cooled Condensers

Description of Air Cooled condensers

Centrifugal fan air cooled condenser Condensers Static

Evaporative Condensers

Water cooled Condenser Classification based on construction

Tube in tube condensers

Small tube in tube condensers

Straight tube in tube condensers

Shell and water cooled condensers

Vertical shell and coil water cooled condensers

Shell and tube water cooled condensers Vertical shell and tube condensers

Surface condenser

Counter flow in condensers

Cross flow in condensers

Air cooled condensers

Cooling Tower

Re circulated water system

Condenser control

Condenser capacity

Condensing temperature control

Expansion valve
Objectives

Expansion device

Superheat sensor on dry expansion circuit

Thermostatic expansion valve

Automatic expansion valve

Thermal electric expansion valve

Capillary tube

High pressure float valve

Low pressure float valve

TXV Control

Operation of thermostatic expansion valve

TXV Operation

Evaporator

Evaporator Control

Splitting finned – tube evaporator coils

Row – split coil configuration

Refrigeration accessories and their locations

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