RU93945U1 - ABSORPTION-DIFFUSION REFRIGERATING UNIT - Google Patents

Abstract

 An absorption-diffusion refrigeration unit comprising a boiler, an absorber, a receiver, a heat exchanger and a steam lift pump with a lift pipe and a steam pipe, characterized in that the lift pipe of the lift pump is curved.

Description

The utility model relates to household refrigeration equipment, namely to absorption and diffusion refrigeration units (ADHA).

Known ADHA (RF patent No. 2207473, IPC, 7 F25B 15/10, 2001, which contains a boiler, heat exchanger, absorber and a lift pump for supplying a strong solution to the steam cavity of the boiler body.

A disadvantage of the known ADXM is its low thermodynamic efficiency due to insufficient heat recovery between the refrigerant vapor and the strong solution.

Known ADHA - prototype (RF patent No. 2031328, IPC 6 F25B 15/10, 1992), containing a boiler, steam pipe, absorber, receiver and heat exchanger-regenerator. The steam cavity of the boiler body is connected by a steam line with the formation of a water seal to the lift pipe of the steam lift pump, the upper end of which is inserted into the steam cavity of the receiver, and the lower end is connected with the formation of a water seal to the tank made from the bottom of the absorber.

The disadvantages of the prototype include insufficient refrigerating capacity due to the low intensity of heat and mass transfer processes.

The objective of the utility model is to increase the cooling capacity of ADHA by increasing the intensity of heat and mass transfer processes by increasing the time and contact area of two phases.

The task is achieved by the fact that in the absorption-diffusion refrigeration unit containing a boiler, absorber, receiver, heat exchanger and a steam lift pump with a lift pipe and steam pipe, according to a utility model, the lift pipe of the steam lift pump is made curved.

The drawing schematically shows the claimed ADHA.

ADHA contains a steam lift pump, consisting of a lift pipe 1 and steam line 2. Steam line 2 serves to supply refrigerant vapor from the boiler 3 to the lift pipe 1. The lift pipe 1 is made curved (in the form of a flat snake, spiral, in the form of a volume coil, etc. .). The upper end of the lifting pipe 1 is brought into the vapor cavity of the receiver 4, and the lower end is connected with the formation of a water seal to the tank 5, coupled in pairs with the absorber 6. The heat exchanger 7 of the "pipe in pipe" type provides heat exchange between a weak solution from boiler 3 and a strong solution from receiver 4. The boiler 3 is equipped with an electric heater 8.

The inventive ADHA works as follows.

The internal cavity of ADHA is evacuated and filled with a water-ammonia solution and hydrogen according to known parameters and proportions. As a result of heat removal from the electric heater 8, a strong solution in the boiler 3 boils. In this case, a weak solution is formed, which enters the absorber 6 through the heat exchanger 7, and the refrigerant vapor, which enters the riser pipe 1 through the steam line 2 of the lift pump, squeezing the water seal. In this case, a two-phase flow is formed, which through the riser pipe 1 enters the receiver 4, where the strong solution and the refrigerant vapor are separated, which then enter the condenser (not shown in the drawing).

After liquefaction in the condenser, the liquid refrigerant is discharged into an ADXA evaporator (not shown in the drawing), in which it evaporates at a low partial pressure, producing a cooling effect. The rich hydrogen-ammonia mixture from the evaporator enters the tank 5 and then to the absorber 6, where ammonia vapor is absorbed from it with a weak solution. In this case, the solution becomes strong and accumulates in the tank 5, and almost pure hydrogen again enters the ADHA evaporator. A strong solution from the tank 5 through the hydraulic lock is supplied to the lower part of the lift pipe 1 of the steam lift pump, through which it is supplied to the receiver 4 by means of a pair of refrigerant from the boiler. After that, the ADHA work cycle is repeated.

The two-phase flow ascending along the lift pipe 1 of the steam lift pump has a clearly defined slug (piston) flow regime. A large number of bubbles of refrigerant vapor create the most favorable conditions (due to direct contact of the phases) of intensive heat transfer between the refrigerant vapor and a strong solution for its preliminary heating. In addition, in the process of raising a bubble of refrigerant vapor along the lift pipe 1 of the steam lift pump, additional evaporation of ammonia from the strong solution that enters the bubble occurs. This increases the concentration of refrigerant vapor supplied to the ADXA condenser, i.e. increases mass transfer between circulating substances.

The implementation of the lifting pipe 1 of the curved steam lift pump can significantly increase its length and, as a result, increase the time and contact area of two phases (strong solution and refrigerant vapor directly from the boiler), which entails a proportional increase in the intensity of heat and mass transfer processes in the unit, which as a result, it allows to increase the cooling capacity of ADHA.

The economic feasibility of using the proposed ADHA with a curved pipe is that it will lead to a decrease in the daily energy consumption of absorption refrigerators by increasing the intensity of heat and mass transfer in ADHA.

Claims (1)

An absorption-diffusion refrigeration unit comprising a boiler, an absorber, a receiver, a heat exchanger and a steam lift pump with a lift pipe and a steam pipe, characterized in that the lift pipe of the lift pump is made curved.