Course Content
Lesson 1: HVAC Introuduction
Why do we need to learn this HVAC certificate course? What is HVAC? What is the scope of HVAC? What the Fields for HVAC Engineer?
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Lesson 2: Brief History of Refrigeration.
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Lesson 3: Basic of Thermodynamics
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Lesson 4: Introduction and Overview of Air-Conditioner & Refrigeration
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Lesson 5: Fundamentals of Refrigeration
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Lesson 6: Basic Refrigeration System & Its component
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Lesson 7: Elements of Psychrometry
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Lesson 8: Some Short Definitions Relative to HVAC
:- DBT :- WBT :- DPT :- RH :- Specific Humidity or Moisture Content :- Enthalpy :- Enthalpy Deviation :- Specific Volume :- Sensible Heat Factor :- Alignment Circle :- Pounds of Dry Air
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Lesson 9: Applied Psychrometry
Let us, now see how the various air conditioning procedures will be represented on a Psychometric chart.
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Lesson 12: Heat Load Calculation on Excel Sheet
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Lesson 13: Machine Selection
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Lesson 14: Duct Sizing
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Lesson 15: Air Distribution Terminal
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Lesson 16: How to Calculate Static Pressure
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Lesson 17: Kitchen Ventilation
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Lesson 18: Selection of AHU
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Complete Heating Ventilation & Air Conditioning Online Certificate Course In Hindi

Condenser

Function of Condenser

In a cooling cycle of a refrigeration system, heat is absorbed by the vapor refrigerant in the evaporator followed by the compression of the refrigerant by the compressor. The high pressure and high temperature state of the vapor refrigerant is then converted to liquid at the condenser. It is designed to condense effectively the compressed refrigerant vapor.

here are basically three types of condensing unit depending on how the heat is removed by the condensing medium which is usually water, air or a combination of both.

Air-CooledÂ types are usually used in the residential and small offices applications. They are used in small capacity systems below 20 tons. The advantages of using this design include not having to do water piping, not necessary to have water disposal system, saving in water costs and not much scaling problems caused by the mineral content of the water.Â It is also easier to install and has lower initial cost. There isnâ€™t much maintenance problems. The disadvantages are that it requires higher power per ton of refrigeration, has shorter compressor life and on days when most cooling is required, the least is available.Â

The circulation of air-cooled type can be by natural convection or by forced convection (usually using blower or fan). Due to its limited capacity, natural convection is used in smaller applications such as freezers and refrigerators. In forced convection, air is circulated by using a fan or blower that pulls the atmospheric air through the finned coils. Internally, the refrigerant circulates through the coil and air flows across the outside of the tubes.

Water-CooledÂ There are 3 types commonly being used. They areÂ shell and tube, shell and coil, and double tube. The most commonly used is the shell and tube type and are usually available from two tons up to couple of hundred tons. This design has lower power requirements per ton of refrigeration and the compressors can last longer compared to the air-cooled type. A water cooling tower is frequently used for higher capacity application.

EvaporativeÂ type which is a combination of water and air-cooled.

Air-Cooled and Water-Cooled Comparison

Air-cooled type operates at higher head pressure or condensing pressure, hence reducing the capacity of the compressor and increases the power intake. In general, a 2 hp water-cooled system will require the same refrigeration as a 3 hp air-cooled system.

The maintenance costs of water-cooled type is about three to four times the air-cooled type. Air-cooled type maintenance is usually limited to regular lubrication of fan and motor bearings. Water-cooled type requires cleaning from algae and bacteria. Scales on the tubes are removed by using the acid compounds. Proper water treatment is also critical to the operation of the condenser.

Exercise Files
Condenser and It’s Types.pdf
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