SU737725A2 - Refrigerating unit operating method - Google Patents

Description

(54) METHOD OF OPERATION OF REFRIGERATING INSTALLATION

one

The invention relates to the field of refrigeration, in particular to a method of operation of a large refrigeration unit equipped with an air-cooled condenser.

According to the main author. St. No. 601537 discloses a method of operating a refrigeration unit by evaporating a liquid refrigerant, condensing vapor at a pressure not exceeding the boiling pressure, compressing the refrigerant after condensation, and throttling the vapor to form their evaporation to condensing pressure 1.

The disadvantage of this method is the imperfection of the process of reducing the pressure G, since during throttling the internal energy of the gas is spent on overcoming friction, the process has a high degree of irreversibility and proceeds with an increase in entropy.

The purpose of the invention is to increase the efficiency of the installation.

This goal is achieved by the fact that the refrigerant, after evaporation, heats up the waste heat from the cooled object while simultaneously increasing the pressure of the ei-o vapor, and after throttling,

are extensions with simultaneous mechanical work.

The drawing shows a diagram of the refrigeration unit.

The refrigeration unit contains an evaporator 1 for producing cold, an air-cooled condenser 2 for condensing refrigerant vapor, a linear receiver 3, a centrifugal pump 4 for transferring refrigerant to an evaporator, a heat exchanger 5 for heating the evaporated

10 refrigerant and heat load removal and expander 6 for reducing the pressure of the gaseous refrigerant and obtaining mechanical work.

 Refrigeration unit works as follows.

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The refrigerant vapor generated during the evaporation process from the evaporator is sent to the heat exchanger 5, heated from a temperature of minus 5 ° C to plus 35 ° C and expands, for example, in expander 6 from a pressure of 3,6 atm (this pressure corresponds to the boiling point -5 ° C) before the condensing pressure of 1.9 at (the temperature at which the refrigerant vapor condenses is minus 20 ° C). Then couples

the refrigerant enters the condenser 2, where the condensation is carried out at a pressure not exceeding the boiling pressure. The condensed refrigerant is poured into the linear receiver 3. Using the pump 4, the liquid refrigerant is pumped to the evaporator 1, at the same time increasing its pressure from 1.9 at (condensing pressure) to 3.6 at (boiling pressure).

During operation of the refrigeration unit, an increase in the cooling capacity is achieved due to heat removal in the heat exchanger. In addition, with expansion in the expander, additional mechanical energy is obtained.

Claims (1)

Invention Formula The method of operation of the refrigeration unit on Aut. St. No. 601537, characterized in that, in order to increase efficiency, after evaporation, the refrigerant is heated with heat from the object being cooled with simultaneous increase in vapor pressure, and after throttling it is expanded with simultaneous mechanical work. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 601537, cl. F 25 B 19/00, 197fe.