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В качестве источника была выбрана книга "PRINCIPLES OF REFRIGERATION"*// Roy J. Dossat, Thomas J. Horan// Fifth Edition, Ferris State University// Prentice Hall Upper Saddle River, New Jersey, 2002. - 454 P.
Condensers act as a heat source, rejecting the heat absorbed from the evaporator along with the heat of compression to the cooler ambient surrounding its coils.
As a matter of economics and environmental-based legalities, it is not permissible to allow refrigerant vapors to escape the system and diffuse into the atmosphere. Therefore, the vapor must be continuously collected and condensed back into its liquid state so that it can be used over and over again in the vapor-compression cycle. This strategy eliminates the need for replenishing the supply of refrigerant in the system during normal operation. To provide some means of condensing the refrigerant vapor, a condenser is added to the system as shown in Figure 1.
The condensing medium is the substance that absorbs the latent heat of vaporization and heat of compression carried by the refrigerant vapor entering the condenser. This heat transfer process allows the refrigerant to condense into its liquid phase so the cycle can be continuous. The most common condensing media used in refrigeration processes are water and air. When water is used as a condensing medium, it is usually supplied from the city main or from a cooling tower. When air is used as the condensing medium, it is usually the air surrounding the exterior of the cabinet or air being supplied from outdoors.
For heat to flow from the superheated discharge vapor flowing through the condenser, the temperature of the condensing medium must be less than the saturation temperature of the refrigerant vapor. The refrigeration system is designed so that the heat of compression will raise the temperature of the refrigerant vapor a minimum of 20 °F (11.1 °C) above the expected temperature of the condensing medium. This design strategy ensures that the condenser will always be able to reject the heat necessary to allow the vapor to be cooled to its saturation temperature. The transfer of heat from the refrigerant vapor to the condensing medium allows the refrigerant to change phase into its liquid state. Most condensers are designed to permit some additional subcooling before the high-pressure, high-temperature liquid refrigerant exits the condenser and flows into the receiver.
Fig. 1. Collecting and condensing the refrigerant vapor.
Refrigerant absorbs heat in the evaporator and gives offbeat in the condenser
* Фирмы и организации, а также частных лиц, заинтересованных в переводе и издании в России книги "PRINCIPLES OF REFRIGERATION"*// Roy J. Dossat, Thomas J. Horan, просим с предложениями обращаться по e-mail:
