Mesin Pendingin Helmi

Welcome to ………Engine Hall

Machinery

Presentation

Speaker :

Suhelmi,ST.M.Mar.Eng

Topic : Refrigerator

Date : 03h

Pebruary 2005

Time : 13.00 – 16.00 pm

Audience : Engine Cadets

Introduction

Refrigerant Types

Refrigerator Process

Basic Principle

Just be the real engineer

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The Introduction of Refrigerator

• Refrigeration,the industry of preserving food by cold.

• Scope of mechanical Refrigeration is used for :~ domestic refrigeration,~commercial refrigerant, ~ air conditioning.~ confort cooling,~ dehumidifying~ freezing foods,~ cooling in manufacturing processes.~ numerous other application.

• Heat is molecular motion. All subtance are made up of tiny molecules which are in a state of rapid motion (vibration)~As the temperature of a Subtance is Increased the motion Increases.~As the temperature of a Subtance is Decreased the motion Decreases.

• Cold is a relative term used to denote a low temperature.~Cold is not something which is produced,but rather heat is extracted and the resulting condition called”cold” by the Proces the process of extracting heat from the interior of the refrigerator cabinet. ~The Refrigerator does not destroy the heat,but rather pumps the heat from inside of box to outside.~Heat and cool are opposite ends of the same thing.~The Heat can not travel from a cold body to hot body,but always travels from the body of a higher temperature to a colder one (2nd law of Thermodynamics)

• How cold preserves Food ?~ As the molecules move slower,there are an important effect on the bacteria that are present in most Foods.~ Cold ,or Low temperatures,slow up growth of these bacteria and food do not spoil as Fast.~Slowing the movement or cooling of the molecules tends to make all organisms more sluggish.~ Spoiling of food is actually the growth of bacteria in the Food.~If these bacteria can be kept from increasing,the foods will edible for longer period of time.

. Removing Heat

~Heat always flow from hot to cold,that is from higher temperatures to lower temperatures.~Faster moving molecules impart some of their energy to slower moving molecules.~Therefore,the faster molecule slows a litle and the slower one moves a litle faster.~Sometimes,however,the molecules instead of moving slower or faster,Change their shape.~The Change in shape is caused by one or more of the Atoms in the molecules shifting to a different position and the molecule will change from a Gas to a Liquid,or vice versa.

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Music jack

s.W

inlet

s.W

outlet

Filter & Dryer

condenser

expantion

valve

Evaporator

Oil

separator

Solenoide

valve

COMPRESSOR

Compressor

on

Sea water

Cooling

start

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Liquid Refrigerant , High press

Liquid Refrigerant , Low PRESS

Hot gas Refrigerant , High Press.

Evapor gas Refrigerant , Low press

Lub oil , Return to Crank case

REFRIGERANTSIDENTIFYING BY NUMBER,CYLINDER COLOR CODES,SUBTITUTIONS.

• REFRIGERANT REFRIGERANT CHEMICAL COLOR BOILING TEMP.AT ATMOS PHERIC PRESSURE

NUMBER NAME FORMULA CODE ºF ºC

R-764 Sulfur dioxide So2 Black 14 F -10 CR-40 Methyl Chloride Ch3Cl Orange -10.4 F -23,5556 CR-12 Dichloro difluoromethane Ccl2F2 White -21.62 F -29,7889 CR-22 Monochloro difluoromethane CHCLF2 Green -41.44 F -40,8 CR-113 Tricloro fluoro ethane CCL2FCCLF2 Purple 117.63 F 47,5722CR-114 Dichlorotetro fluoroethane CCLF2CCLF2 Dark Blue 38.39 F 3,55 CR-502 Refrigerant 22/115 CHCLF2 / Orchid -50.1 F -45 C

(48,8 %R22 / 51,2 % R-115) CCLF2CF3

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DESIRABLE CHARACTERISTICS A REFRIGERANT

NON-POISONOUS

NON EXPLOSIVE

NON-CORROSIVE

NON-FLAMMABLE

NON-TOXIC

SHOULD OPERATE UNDER LOW PRESS(LOW BOILING POINT)

~maker : KYUNGWONG CENTURY REFRIGERATOR JAPAN.~the Function : Installed for air dryer of control air & Pneumatic valve system.

the equipment are used for remove / drain out water on the pneumatic system (dry air system).~ when we use air pressure for control air system,the air pressure about 7 kg/cm,The air containt water (wet air) flow to the

pneumatic valve,the water caused corrosion than the pneumatic valve stuck/trouble.Example:

Air drying for main engine control air maneuvreing system.when air pressure flow to the pneumatic system.some wet air flow to the control air of Pneumatic valve.Wet air will change to a

liquid /Water.~water in the pneumatic valve system will cause corrosion than make pneumatic system get trouble (stuck)The new tecnology recover the new system to avoid or minimized the pneumatic system trouble.Refrigifilter by japan maker used to protect wet air flow to the pneumatic system.

The basic principle of the Refrigifilter are the same principle with refrigerator & air cond system.

S.W COOLING

inlet

s.W COOLING

outlet

Filter & Dryer

expantion

valve

Oil

separator

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Pressure regulator

To decrease air pressure

about 7 kg/cm2

Evaporator

Reservoir

Air tank

air in

wet

condition

About

30

Kg/cm2

condenssor

COMPRESSOR

DRY AIR TO PNEUMATIC

VALVE SYSTEM.

Water

trap

drain

out

water

to e/r

bilge

THE NEW INVENTION OF SHIPPING TECNOGY

REFRIGIFILTER FOR AIR DRYING OF PNEUMATIC VALVE SYSTEM