Topics: HVAC, Heating, ventilating, and air conditioning, Area Pages: 7 (673 words) Published: August 24, 2013
Basic Components of Refrigeration system


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:


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

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 Control

Splitting finned – tube evaporator coils

Row – split coil configuration

Refrigeration accessories and their locations


Filtering and drying

Pressure controls and their application

Window air conditioners

The refrigeration system of the window air conditioner

Parts of the window air conditioners

The refrigeration system of the window air conditioner :

The refrigeration system of the window air conditioner:

Types of Split A/c


Parts of a split air – conditioning system

Air filter

Outdoor unit

Expansion valve

Refrigerant piping or tubing

Working of split ac

Pressure sides

Air Conditioning schematic system

The various steps involved in this method are:
1. Select suitable velocities in the main and branch ducts. 2. Find the diameters of main and branch ducts from airflow rates and velocities for circular ducts. For rectangular ducts, find the cross – sectional area from flow rate and velocity, and then by fixing the aspect ratio, find the two sides of the rectangular duct. 3. From the velocities and duct dimensions obtained in the previous step, find the frictional pressure drop for main and branch ducts using friction chart or equation. 4. From the duct layout, dimensions and airflow rates, find the dynamic pressure losses for all the blends and fittings. 5. Select a fan that can provide sufficient FTP for the index run. 6. Balancing dampers have to be installed in each run. The damper in the run is left completely open, while the other dampers are throttled to reduce the flow rate to the required design values.

A = q/v, where A = duct cross sectional area , m2
Q = air flow rate m3/s, v = air speed m/s

Velocity reduction method:
If CFM, Q, and velocity V are known area A = Q/V,
Since Area of a round duct = 22*d*d/(4*7)D = Square root of(4*7*A/22). So we get diameters as 31 and 32. If for a diameter of 31”, we have a height restriction of 20”.we refer to equivalent diameeter chart to get 40*20 duct. Note D equivalent =...
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