Steam jet refrigeration system is to replace the compressor with an injector

Steam jet refrigeration system is to replace the compressor with an injector, to consume heat as compensation, using the working medium at low pressure gasification heat absorption to achieve refrigeration system. Here's how:

Working principle

Power generation: Water vapor (working steam) with higher pressure supplied by the boiler enters the Laval nozzle in the main injector, where it is adiabatically expanded to form a low-pressure high-speed airflow.

Extraction and evaporation: the use of the high-speed steam flow from the evaporator to continuously extract steam, so that the evaporator to maintain a high vacuum, low evaporation pressure. Cold water from the refrigeration device enters the evaporator after throttling and decompression, part of the water evaporates and absorbs the heat of the rest of the water, so that the remaining cold water temperature is reduced, and the cold water after cooling can be used repeatedly after being output by the pump.

Compression and condensation: The working steam in the injector and the steam pumped from the evaporator rise to the condensing pressure through the diffuser tube, enter the condenser and contact with the cooling water directly, condensing into the cooling water. The non-condensing gas in the condenser is attracted and removed by 1 and 2 stage auxiliary ejectors to keep the condenser at a certain vacuum degree.

Main component

Boiler: Produces working steam at higher pressure to power the entire system.

Injector: including nozzle, suction chamber, diffuser three parts. The nozzle makes the working steam adiabatic expansion to form a high-speed airflow; Suction chamber for inhaling steam in the evaporator; The diffuser pressurizes the mixed steam to condensing pressure.

Condenser: The mixed steam from the ejector cools and condenses into a liquid, which can be divided into mixed condenser and shell condenser.

Evaporator: the cold water after the throttle decompression is evaporated in which the heat is absorbed, so that the cold water temperature is reduced and the cooling effect is produced.

Throttle valve: The cold water entering the evaporator is throttled and decompressured, so that the water in the evaporator can evaporate at low pressure.

Pump: including cooling water pump and cold water pump, the cooling water pump will condense water in the condenser into the boiler, and the cold water pump will supply the cold water output after cooling in the evaporator.

peculiarity

Advantages: The form of compensation energy is heat energy, can not use electric energy; Simple structure, easy processing, no moving parts, long service life; If it is used in occasions where there is more industrial surplus steam, it can save energy; When water is used as refrigerant, it has the advantages of large latent heat of vaporization and non-toxic, and the system is safe and reliable.

Disadvantages: The required working vapor pressure is high, generally 0.5-5 mpa; The irreversible loss of the injector is large and the efficiency is low. The equipment is huge and needs to be installed at a high level, generally more than 10 meters, so that the cooling pump and the suction of the cold pump are positive pressure.

Application field

It is mainly used in air conditioning and some production processes, and can produce cold water required for air conditioning.