Cold generation method

FIELD: heating systems.

SUBSTANCE: invention refers to cooling equipment. According to cold generation method, dry vapour or superheated steam is compressed to the pressure appropriate to condensation temperature of working medium. In condenser, steam is converted from superheated state to saturated one and is liquefied. Obtained liquid is moved to throttle device connected to evaporator where liquid boils thus absorbing heat. Two-phase working medium is formed before throttle device. Steam phase which is obtained from superheated steam and its dosed supply is performed is supplied to available liquid phase. Some part of superheated steam is taken from condenser inlet and passing the condenser, it is supplied to throttle device inlet. Dosed superheated steam supply is performed in amount not more than amount of supplied liquid of liquid phase.

EFFECT: increasing refrigerating factor.

2 cl, 3 dwg

 

The invention relates to refrigeration, and in particular to refrigeration plants and methods of producing them in cold used, for example, in the cells for food storage for air conditioning, cooling of electronic equipment vehicles, for insulating systems of enterprises.

A known method for the production of cold by the patent of Russian Federation №2081378, CL F25D 31/00, F25 1/06, 1994, providing for the refrigerant in the evaporator with heat removal from the cooled object, the suction and injection compression low-temperature refrigerant vapor, condensation of the compressed vapor, separating the condensed liquid refrigerant flows and flow of one of the flow through the throttle into the evaporator, and the other in the capillary pump, a supply of heat to the latter from an external source by providing capillary compression and evaporation of liquid refrigerant and high-grade working steam to ejector, the flow of liquid refrigerant supplied to the capillary pump, pre preobladayut due to heat, or with pairs of low-temperature refrigerant downstream of the evaporator, or a part of the liquid refrigerant, dresselian after condensation.

This method represents a very challenging technological process of obtaining cold, requiring significant expenditure e is extraenergy, reduce the plant capacity and coefficient of performance.

A method of obtaining cold for U.S. patent No. 3798920, CL F25B 29/00, 1974, adopted by the applicant for the prototype. According to this method, squeeze dry or superheated steam to a pressure corresponding to the condensing temperature of the working medium in the condenser the steam from superheated state is switched to a rich and szhizhajut formed liquid is directed to a throttling device that is connected to the evaporator, where the liquid boils, absorbing the warmth.

However, this method has a major drawback, which is characterized by high costs to drive the compressor, i.e. a significant loss of power installation, entail a reduction of the cooling rate.

An object of the invention is the reduction of power supplied to the compressor, and increase the yield of the produced cold, i.e. increasing the refrigeration coefficient by obtaining a lower temperature in the evaporator.

The technical problem is solved by the fact that in the proposed decision before throttling device form a two-phase working medium to the existing liquid phase serves the vapour phase, which is created from the superheated steam and exercise it dosed feed, and take part of the superheated steam from the input capacitor, and m is Noa capacitor, served on the inlet throttling device.

In addition, a metered flow of superheated steam is carried out in an amount not exceeding the amount of the liquid of the liquid phase.

Figure 1 shows a diagram of the installation for the production of cold by the proposed method;

figure 2 - graph of the power consumed by the compressor from the engine speed of the shaft of the compressor;

on. figure 3 is a plot of the pressure of the working medium in the installation system from the speed of the shaft of the compressor.

The apparatus comprises a compressor 1 driven by an electric motor 2, a condenser 3, sequentially mounted to the compressor 1. For the capacitor 3 is set throttling device 4, which pipe 5 is connected to the evaporator 6, and it is connected to the input 7 of the compressor 1 by the pipe 8. The output 9 of the compressor 1 is additionally connected to the input 10 of the throttling device 4 by the pipe 11 in parallel with the capacitor 3. In the pipeline 11 embedded device 12 dosed supply of superheated steam.

The installation according to the method works as follows.

Working environment in the form of steam, coming out of the evaporator 6 through the inlet 7 of the compressor 1 is fed into the compressor 1. In the compressor 1 in the actions heats the working environment to the condition of dry or superheated paraparesia compressor 1 and o adiabatically compress the steam pressure, corresponding to the condensing temperature of the working environment. Released through the outlet 9 superheated vapor from the compressor 1 is divided into two streams: one is sent directly to the condenser 3, and the second part coming out of the compressor 1 superheated steam, is sent to the device 12 dosed supply of superheated steam. In the condenser 3 pairs of superheated state is switched to a rich and szhizhajut. The temperature of the liquid may be below the condensation temperature in the condenser 3. Thus formed liquid - liquid phase is sent to a throttling device 4, to which, at its input 10, this liquid phase is directed from the condenser 3, and a superheated steam - steam phase, held device 12 dosed supply of superheated steam, meet and mix. The amount of superheated steam in the vapor phase serves no more than the quantity of the supplied liquid liquid phase. We have already received a two-phase working medium: liquid+vapor, through the throttling device 4 is sent to the evaporator 6, where it boils, absorbing the warmth. With the added dose of superheated steam, vapor phase, improves the process of boiling and serves as an accelerator of his prostacare adding my amount of heat in the upcoming process of evaporation of the liquid phase, thereby providing a more complete boiling liquid phase.

Under optimal soo is wearing the steam and liquid phases occurs over the full boiling of the working environment, that, in turn, leads to a significant temperature drop in the evaporator ceteris paribus. As a result, in addition, there is a reduction of the working medium pressure in the system and reducing the power consumption by the compressor, which is confirmed by the graphs shown in figure 2 and 3.

From the evaporator 6, the working environment for line 8 enters the compressor 1 and the cycle repeats.

The use of two-phase working medium for the production of cold helped to reduce the evaporator temperature at 5-10°C. with a simultaneous decrease in consumption of the compressor capacity and a reduction in operating pressure in the system, thus increasing cooling rate.

1. Method of manufacturing cold, according to which squeeze dry or superheated steam to a pressure corresponding to the condensing temperature of the working medium in the condenser the steam from superheated state is switched to a rich and szhizhajut formed liquid is directed to a throttling device that is connected to the evaporator, where the liquid boils, absorbing the warmth, characterized in that before throttling device form a two-phase working medium to the existing liquid phase serves the vapour phase, which is created from the superheated steam and exercise it dosed feed, and take part of the superheated steam from input con is instore and bypassing the condenser is fed to the input of the throttling device.

2. The method according to claim 1, characterized in that the metered flow of superheated steam is carried out in an amount not exceeding the amount of the liquid of the liquid phase.



 

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FIELD: refrigeration industry; cooling installations components.

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6 dwg

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2 dwg

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2 dwg

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