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Author: Date:2014/11/27 11:01:39 Visits:

 General principles of refrigeration

The role of general refrigerator compressor cooling principle is to compress the lower pressure steam to higher pressure steam, so that the volume of the steam is reduced, the pressure increases.
The compressor suction pressure from the evaporator lower working fluid out of the steam, so that the pressure rise into the condenser, condensed in the condenser to a higher pressure fluid, after the throttle valve throttling, the pressure becomes relatively low liquid into the evaporator, absorbing heat in the evaporator is evaporated into low pressure steam, and then fed to the inlet of the evaporator, thereby completing the refrigeration cycle. 1. The vapor compression refrigeration principle
Single-stage vapor compression refrigeration system is determined by the refrigeration compressor, condenser, evaporator and throttle four basic components. Sequentially connecting pipe between them, form a closed system, the refrigerant in the system constantly circulates, a change of state, heat exchange with the outside world. Their work shown in Figure 1. 2. The basic principle of refrigeration system
After the liquid refrigerant absorbs heat of the object to be cooled in the evaporator, into the vaporization temperature low-pressure steam, is sucked into the compressor, compressed into a high pressure high temperature steam into the condenser, the condenser of the cooling medium (water or air ) heat, condenses to a high pressure liquid, through the throttle valve is throttled to a low temperature and pressure of the refrigerant enters the evaporator absorbs heat of vaporization again achieve a circulating cooling purposes. Thus, the refrigerant in the system via evaporation, compression, condensation, throttling four basic process is complete a refrigeration cycle.
In refrigeration systems, evaporators, condensers, compressors and refrigeration systems throttle is essential four pieces, which were cold evaporator is transported equipment. The refrigerant cooled in the heat which is absorbed by the object of refrigeration. Compressor is the heart, plays a suction, compression, transport refrigerant vapor action. Condenser is a heat release device, the heat absorbed in the evaporator compressor work together with the transformed heat transfer to the cooling medium taken away together. Throttle refrigerant from throttling effect, while controlling and regulating the amount of refrigerant into the evaporator liquid, and the system is divided into the high side and low side of two parts. The actual cooling systems, in addition to the four pieces outside, often have some auxiliary equipment, such as solenoid valves, distributor, dryer, collector, fusible plug, pressure controllers and other components, which are run in order to improve economy, reliability and safety are provided.
2. The refrigeration system main components
Air conditioning can be divided according to the condensed form: water-cooled and air-cooled two, depending on the purpose and can be divided into single-cooled
Cooling and heating type two, no matter what kind of type of composition, are a combination of the following major components made of. The main components of refrigeration system compressor, a condenser, an evaporator, an expansion valve (or capillary tube, the subcooling control valve), the four-way valve, double valve, check valves, solenoid valves, pressure switches, fusible plugs, the output of the pressure regulating valve pressure controllers, storage tank, heat exchangers, collectors, filters, dryers, automatic opening and closing, closing valves, liquid injection plugs and other components.
Electrical system main components are the motor (compressor, fan, etc. with), operating switches, magnetic contactors, relays chain, overcurrent relays, thermal overcurrent relay, temperature regulator, humidity regulator, temperature switches (except
Cream, etc. used to prevent freezing). Compressor crankcase heater, water relays, computer boards, and other components. Control system composed of a plurality of control devices, which are: the refrigerant controller: expansion valve, capillary tube and the like.
Refrigerant loop controllers: four-way valve, check valve, double valve, solenoid valve.
Refrigerant pressure controller: Pressure opening and closing, the output of the pressure regulator valve, pressure controller.
Motor protection: overcurrent relays, thermal overcurrent relay, temperature relay. Temperature regulator: Temperature-position adjustment, temperature proportional regulator. Humidifiers: Humidity bit regulator. Defrost Controller: defrost temperature switch, defrost relay, various temperature switch. Cooling water control: without water relays, water regulating valves, pumps and so on.
Alarm control: over-temperature alarm, over wet alarm, undervoltage alarm and fire alarm, smoke alarm. Other control: Indoor fan speed controller, the outdoor fan speed controller. 3 Common refrigerants and their properties
Many types of refrigerant, Freon 12 and 22 will now make a brief introduction:
a. Freon 12 (CF2Cl2) Code R12 Freon 12 is a colorless, odorless, transparent, almost non-toxic refrigerant, but the air will cause the content of more than 80% of people suffocation. Freon 12 will not burn and will not explode when in contact with an open flame or temperature reaches 400 ℃, can decompose harmful hydrogen fluoride, hydrogen chloride and phosgene (CoCl2). R12 is the widely used refrigerant temperature, suitable for small refrigeration systems, such as refrigerators, freezers and so on. R12 can dissolve a variety of organic matter, so you can not use a general rubber gasket (circle), commonly used synthetic chloroprene rubber or nitrile rubber sheet or seals.
b. Freon 22 (CHF2Cl) Code R22 R22 does not burn nor explode, and its toxicity is slightly larger than the R12, water solubility, although larger than the R12, but still make the cooling system happen "ice jam" phenomenon. R22 can be partly dissolved to each other with the lubricating oil, along with its solubility and the type of the lubricating oil temperature, and so the use of R22 refrigeration system must have oil return measures.
R22 corresponds to the evaporation temperature at standard atmospheric pressure of -40.8 ℃, condensing pressure at room temperature of not more than 15.68 × 105 Pa, and the cooling capacity per unit volume than R12 is 60% or more. In the air-conditioning equipment, most choose R22 refrigerant.

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