RU2105938C1 - Stand for testing absorption-compression refrigerating unit - Google Patents

Abstract

FIELD: refrigerating engineering. SUBSTANCE: test stand is made in form of two absorption-compression loops and is provided with heat-insulated reservoir 10 having two sections 12 and 11; built in first section 12 is high-pressure pipe line of compression loop; second section 11 has built-in low-pressure pipe line after calorimeter 23 of absorption loop. Both sections 11 and 12 are connected in series to water cooling system. EFFECT: enhanced efficiency. 1 dwg

Description

 The invention relates to refrigeration, in particular to stands for testing absorption and compression refrigeration units.

 The purpose of the invention is the expansion of functionality in the study of the operational characteristics of combined absorption and compression refrigeration units with a second compression circuit under test.

 The drawing shows a diagram of a bench for testing an absorption-compression refrigeration unit. The stand contains an absorption circuit consisting of a generator 1 with an electric heater 2, a liquid heat exchanger 3, a reflux condenser 4, a water cooling condenser 5, a control valve 6, a calorimeter 7, an additional two-section tank 8, a heat exchanger 9, which acts as an absorber coil, a two-section heat-insulated tank 10, the second section 11 which performs the function of an absorber, and the first 12 is connected to the suction pipe 13 of the compression circuit, consisting of a compressor 14, the cooled head 15 of which dklyuchena inlet conduit 16 to the absorption circuit, the regulating valves 17 and 18. Yield cooled head 15 is connected to the conduit 19 of the absorption circuit. The compression circuit also contains a water-cooled condenser 20, a throttle valve 21, and a coil 22 of the calorimeter 23.

 The stand is also equipped with a start-up, control equipment and a water cooling system for the heat exchangers of the stand, the latter being placed in a heat-insulated chamber.

 The stand works as follows. The compressor 14 pumps superheated refrigerant vapors into a condenser 20 in which the vapors condense, after which the liquid refrigerant is sent to an additional two-section tank 8, in the first section of which a high-pressure pipe of the compression circuit is integrated to the throttle valve 21, and in the second low-pressure pipe after the calorimeter 7 absorption circuit. These sections are connected between themselves and the water cooling system in series. The use of an additional two-section tank 8 allows us to study the effect of refrigerant supercooling in the compression circuit on the operational characteristics of an absorption-compression refrigeration unit and, on this basis, to optimize heat transfer processes.

 Then the refrigerant is throttled in the throttle valve 21 and enters the coil 22 of the calorimeter 23 with secondary refrigerant, which determines the cooling capacity of the compression circuit. From the coil 22, refrigerant vapors are piped through 13 to the section 12 of the tank 10 and then to the compressor suction pipe 14. During the tests, using the control valves 17 and 18, the required flow rate of the water-ammonia solution is supplied to the cooled head 15 of the compressor 14, where the evaporation of the working fluid provided by the selection of heat overheating. Vapors of ammonia and water from the cooled head 15 and the generator 1 with an electric heater 2 through a pipe 19 are fed to the reflux condenser 4, in which there is an increase in the concentration of the working fluid through ammonia. In this case, the mixture with increased concentration enters the water-cooled condenser 5, and the phlegm flows into the liquid heat exchanger 3. Liquid ammonia is throttled in the control valve and enters the calorimeter 7, and from it through an additional two-section heat exchanger 8 to the heat exchanger 9, in which it is mixed with a weak the solution coming from the generator 1 through the liquid heat exchanger 3. From the heat exchanger 9 the solution passes the second section 11 of the tank 10 and then through the pipe 16 enters the absorption circuit depending on the soda Jania test program.

 The maintenance of the required modes is carried out using a water system. The heat-insulated tank 10 allows you to explore the effect of superheated suction steam on the refrigeration capacity of the compression circuit, depending on the parameters of the ammonia-water solution supplied to section 11.

 The economic efficiency of using the invention is expressed in increasing the reliability of the compressor, increasing its life and the possibility of optimizing the assembly units of the absorption and compression refrigeration unit in the presence of heat exchange between the high-pressure refrigerant R12 after the compression circuit condenser and the ammonia refrigerant R717 on the low-pressure line.

Claims (1)

 Test bench for an absorption and compression refrigeration unit, comprising an absorption circuit consisting of a generator with an electric heater, a liquid heat exchanger, a reflux condenser, a water cooling condenser, a control valve, a calorimeter, a gas heat exchanger, in one of the sections of which there is a low pressure pipeline after the calorimeter of the absorption circuit, a heat exchanger acting as an absorber coil, a two-section heat-insulated tank, the second section of which performs the function of the absorber, and the first one is connected to the suction pipe of the compression circuit, consisting of a compressor, the cooled head of which is connected at the inlet and outlet to the absorption circuit, control valves, a water cooling condenser, a throttle valve and a calorimeter coil, characterized in that the gas heat exchanger is made in the form additional heat-insulated two-section capacity, in the second section of which a high-pressure pipeline of the compression circuit is integrated, while both sections are connected in sequence to a water cooling system.