Air Conditioning System on Ships

7/28/2019 Air Conditioning System on Ships

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MARINE POWER PLANT

&AUXILIARY SYSTEM

AIR CONDITIONING

SYSTEM


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INTRODUCTION

Air conditioning is a combined process that performs manyfunctions simultaneously. It conditions the air, transports it, and

introduces it to the conditioned space. It provides heating and

cooling from its central plant.

The term HVAC is an abbreviation of heating, ventilating, andair conditioning.

The combination of processes in this commonly adopted term is

equivalent to the current definition of air conditioning. Because

all these individual component processes were developed prior

to the more complete concept of air conditioning, the term

HVAC is often used


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FUNCTIONS

An air conditioning, or HVAC, system iscomposed of components and equipmentarranged in sequence to condition the air,to transport it to the conditioned space,and to control the indoor environmentalparameters of a specific space withinrequired limits.

Most air conditioning systems perform thefollowing functions:


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1. Provide the cooling and heating energy required

2. Condition the supply air, that is, heat or cool, humidify ordehumidify, clean and purify, and attenuate anyobjectionable noise produced by the HVAC equipment

3. Distribute the conditioned air, containing sufficientoutdoor air, to the conditioned space

4. Control and maintain the indoor environmental

parameterssuch as temperature, humidity, cleanliness,air movement, sound level, and pressure differentialbetween the conditioned space and surroundingswithinpredetermined limits


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BASIC AIR CONDITIONING

SYSTEM1) Schematic Diagram

2) Components


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SCHEMATIC DIAGRAM


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FREON (R22/HCFC-22)

Chlorofluorocarbon

Compressor

Compress the Freon to convert to gas

Outside Coil (Condensing Coil)

Changed from gas to liquid under high pressure

Expansion Device

Reduce pressure of liquid

Liquid evaporates into gas

Blower To push the air

Plenum Coil (Evaporator Coil)

Cool and low pressure gas

COMPONENTS


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TYPES OF AIR CONDTIONING

SYSTEMDivided into 2 main classes

Central Unit

Distribute to a group of spaces

through ducting

Self Contained Unit

Installed in space where its serve


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CENTRAL UNIT

Widely used in industrial

System general use:-Single Duct System/Zone Control System

Double Duct System

Reheat System


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SINGLE DUCT SYSTEM

Widely used on cargo ships

Air distribute in a single pipe


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1. Filter

2. Cooler

3. One, two or three-zone heater as required

4. Pre-insulated pipes delivering air to zones

5. Sound attenuating air terminal. With volume

control

6. Automatic steam valves one per zone heater

7. Steam trap. One per zone heater

8. Multi-step cooling thermostat

9. Compressor

10. Automatic capacity control valves

11. Condenser

12. Thermostatic expansion valve

13. Sea water pump

14. Fan starter

15. Compressor starter

16. Sea water pump starter

SINGLE DUCT SYSTEM

& COMPONENTS


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DOUBLE DUCT SYSTEMWidely used on passenger ship


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In this system, two separate ducts are run

from the central unit to each of the airterminals, as shown above.

In winter, two warm air streams, ofdiffering temperatures, are carried to the

air terminals, for individual mixing. The

temperatures of both air streams are

automatically controlled.


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Double Duct System

& Components


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REHEAT SYSTEM

Same concept with single ductSingle Duct with Reheat used for

vessel operating in mainly cool

climatesAir terminals equipped with electric

or hot water heating elements (to

meet the demands of the room

thermostat)


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REHEAT SYSTEM

& COMPONENTS


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THANK YOU

QUESTION &ANSWER

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Air Conditioning System on Ships