HVAC

Marine Heating, Ventilation And Air Conditioning 

Function of H.V.A.C

• used to re-condition and circulate air as part of a heating , ventilating and air-conditioning  system.

Basic function of HVAC, is take in outside air, recondition it,and supply it as fresh air to a building. Usually connect to an Air Handling Unit (A.H.U) system that distributes the conditioned  air to the building. 

Advantages of HVAC

• Equipment preservation
• Cargo preservation
• Crew comfort and Well-being
• Energy Efficiency

Basic of HVAC Components

• Heat exchanger
• Blower motor
• Combustion chamber
• Condenser coil or compressor
• Evaporator coil
• Thermostat

Types of HVAC

• single flow system
• Mixed flow system

Fuel Treatment Equipment

 Type of Centrifuges

• Clarifier

  

      Centrifugal separators used for separating liquid and solid impurities(i,e. fuel and sludges) dont have gravity disc

• Purifier

     Centrifugal separators used for the separation of two liquids of different densities(i,e. fuel and water) have gravity disc

Functions of Gravity disc or Dam ring

• Control the output quality of fuel
• Creating the interface between the oil and water
• Maintaining the back pressure

So we can see the different between clarifier and purifier as below

Fuel treatment

 Fuel treatment

Types of fuel

• Distillate fuels
• Residual fuels

Distillate fuels

Fuels which are free flowing , easily to store and can be used  without further  treatment

Application:  turbine plants, high and medium speed diesel engines

Residual fuels

Very viscous or thick at normal temperatures , and require hearing before use

Applications: slow-speed and some medium-speed diesel engines 

Treatment of Fuel Oil and Lubricating Oil

• Fuel oil and lubricating oil require treatment before passing to the engine
• This will involve separation as a means of removing impurities from a fuel

Separation

Used to:

• Separate two liquids, for example oil and water,or
• Liquid and solids as in contaminated oil

Advantages:

• The separations of impurities and water from fuel oil is essential for good combustion
• The removal of contaminating impurities from lubricating oil will reduce engine wear and possible breakdowns

Methods separate:

1. Gravity in a settling tank
2. Centrifuging the fuel