Ship refrigeration units

devices ship

Ship refrigeration units

Ship refrigeration units.Refrigeration (or refrigeration) means installations intended for artificial lowering. the temperature of the room for the purpose of preserving or freezing perishable products, preparing ice and air conditioning. Various liquids and ra3y are used as refrigerants in refrigerating plants, capable of boiling at low temperatures with decreasing pressure: ammonia, Freon-12, Freon-22, carbon dioxide, water-ammonia solution, and even fresh water. According to the principle of operation, modern refrigeration systems can be divided into three main groups: compressor, 9-absorber  The peculiarity of compressor refrigeration systems is that the process of compressing the working substance (coolant) is carried out with the help of a reciprocating compressor. the distribution on the ships received freon compressors, characterized by their compactness, high cooling capacity, the possibility of their automation. Facilities operating on freon-12 or freon-22, widely They are used in cooling systems for ship’s provisioning chambers and air conditioning in holds with the use of dry brine air coolers.In addition to pistons in freon units, screw and rotary compressors are used. Freon-12 (CFC!) is a colorless heavy gas (about five times heavier than air ) with a very weak specific for the groin, has a boiling point of 29.8 ° C and a freezing point of -155 ° C; not rop} t and does not form explosive mixtures from the air

homo, harmless to humans Freon – 12 poorly soluble in water well in oil, well dissolves opra nic soy. Therefore, oil-refractory rubber (sevanite) is used as the gasket in the plants. The cost of freon is 12 you. but its advantage is that it is unlimited. Paul ro can circulate in the system, and ero application allows you to easily automate the installation. (CHF2Cl) properties is close to freon – 12, Freon – 22 but lighter than it, has a boiling point “at atmospheric pressure – 40.8 ° C, does not explode;

Ship refrigeration units

Ship refrigeration units

Scheme of freon automated installation, llllepTell K MCTansl a M. The cost of ero is higher than that of freon-12, on le is completely harmless to humans, which is the reason for its limited use. The freon units include: a compressor, a condenser, a evaporator, an expander, a thermoregulating ventnel (TpB), a pressure switch (RA), thermostats and other automatics. The scheme of freon, automated installation is shown on pnc. 98. During the operation of the unit, compressor 3 compresses ra-like freon to pressures of 400-800 kN / m2 (4-8 kgf / cm2) and pumps condenser 1 through the shut-off valve and oil separator 2, where it turns into liquid, cooling by the circulating water. From the condenser liquid freon, after passing the heat exchanger 4, filter – drain, with the help of co -. The solenoid valve 9 11 is fed to the TRV in the evaporative batteries 6. In addition, the TRV is boiled to form a vapor-liquid mixture. The amount of liquid Freon coming in is regulated. the sulphuration of liquid Freon, as a result of which the Freon pressure decreases to 30-100 kli / M2 (0,03-1,0 Krc / CM2). li OH llaullHaeT Passing through the evaporative battery tubes 6, the vapor and the liquid freon mixture boils, turns into ra3 and at the 9th century. tensively takes heat from the air and stored in the refrigeration chambers 8 products. Gaseous freon, sucked 113 licensed batteries by the compressor, passes through the heat exchanger 4 where it gives some of the heat to the liquid freo enters the compressor, decreases, and the cycle is repeated again .The temperature cycle is monitored by means of thermocouples. / Along with the Freon units in the transport refrigerator and freezer (up to -18 ° C) special freezers (up to -40 ° C), in some cases ammonia compressor refrigeration units are used. IPU getting cold and the device they are analogous to freon installations

0

Publication author

offline 1 week

Stephen Kevidas

2
Comments: 1Publics: 61Registration: 26-05-2018

Leave a Reply

Authorization
*
*
Registration
*
*
*
A password has not been entered
*
Password generation
49024706