In industrial refrigeration technology, refrigeration compressor It acts as the "heart" coordinating the flow of refrigerant for the entire system. However, to ensure the equipment operates reliably and achieves optimal COP, control is crucial. overheating cycle This is a crucial technical factor that cannot be overlooked. The following article is from engineers at Tan Long This will provide an in-depth look at the operating principles of compressors and how to apply this cycle to improve cooling efficiency while protecting the system. cold storage protecting businesses from technical risks.
What is the supercooling superheating cycle?
Overheating and overheating cycle It is an advanced technical solution widely applied in systems. cold storage In current industrial practice, this is a cycle where the refrigerant is processed in two opposing states: the liquid temperature entering the expansion valve is lowered below the condensing temperature (supercooled region), and the refrigerant vapor is drawn back. refrigeration compressor The temperature is raised above the saturation evaporation temperature (superheated region).
Structurally, this cycle has a similar diagram to the dry cycle but with added features. liquid supercooling set or a heat recovery device before the expansion valve. This improvement reduces throttling losses, increases cooling efficiency, and, most importantly, ensures that the vapor entering the compressor is completely dry. This is extremely important in protecting the system from hydraulic shock, helping to extend the lifespan of the compressor. cold storage compressor High power.
Operating principle of the compressor in the supercooling/superheating cycle
The operating cycle of refrigeration compressor In modern systems, this is illustrated in detail by the diagram below. In this cycle, the compressor plays a central role, drawing the refrigerant in a low-pressure vapor state from the evaporator, then compressing it to high pressure and temperature before delivering it to the condenser.
Depending on the compression technology (piston, screw, or scroll), the efficiency and applications of each type of compressor will vary. Below is an analysis of the physical states of the working fluid in a compressor. refrigeration system Standards with devices labeled A, B, C, D:
- State 1 (At the evaporator – D): The refrigerant absorbs heat from the environment to be cooled (air or liquid), performs a heat exchange process, and completely transforms from a liquid to a vapor state.
- State 2 (At Compressor – A): The vapor is drawn back in. refrigeration compressorHere, the compression process significantly increases the pressure and temperature of the refrigerant, turning it into superheated vapor before it enters the condenser.
- State 3 & 4 (At Condenser – B): At high temperatures, the refrigerant releases heat to the environment and gradually condenses into a liquid. In the subcooling cycle, the liquid temperature is further lowered below the saturation temperature to increase cooling efficiency.
- State 5 (At Throttle Valve – C): The liquid refrigerant passes through the throttle valve to reduce pressure abruptly. This process causes the refrigerant temperature to drop sharply, transforming it into a saturated, moist vapor mixture (vapor + liquid) before entering the system. industrial refrigeration to begin a new cycle.
To analyze and optimize system performance, engineers at Tan Long commonly used Pressure-enthalpy (Ph) graph and temperature – entropy (Ts)These are crucial technical tools that help accurately determine the thermodynamic characteristics of the refrigerant at each nodal point in the system, thereby calculating the most suitable compressor capacity for the project.
The operating mechanism of the industrial steam compression cycle.
Standard vapor compression cycle in systems cold storage Currently, it includes five core stages aimed at transferring heat energy from the environment to be cooled to the outside:
- Phase 1 (Refrigerant Circulation): Refrigerant It acts as an intermediary agent, constantly moving through the equipment to transport thermal energy.
- Phase 2 (Evaporation process at the evaporator): The fluid is in a liquid state and enters at a low temperature. industrial refrigerationHere, it absorbs heat from the air or products in the warehouse. Because the refrigerant temperature is always maintained lower than the cold chamber temperature (usually a difference of about 5°C – 8°C), the refrigerant will boil and completely vaporize to absorb heat.
- Phase 3 (Compression process at the Compressor): The refrigerant vapor, after leaving the cooling coil, is drawn back in. refrigeration compressorThis device compresses vapor to very high pressure and temperature. This process allows the fluid to carry a large amount of thermal energy, preparing it for the next heat release stage.
- Phase 4 (Condensation Process): High-temperature steam enters evaporative condenser (or condenser). Here, the refrigerant transfers heat to the surrounding environment (water or air). When the temperature drops to the saturation temperature corresponding to the condensation pressure, the refrigerant will change from a vapor to a high-pressure liquid.
- Phase 5 (Throttle process): The liquid refrigerant passes through the expansion valve (expansion device). Due to the sudden reduction in cross-sectional area, the pressure and temperature of the refrigerant drop rapidly. At this point, the refrigerant becomes a low-temperature, saturated vapor mixture, ready to return to the evaporator to begin a new cycle.
Practical applications of industrial refrigeration compressors
The core role of refrigeration compressor The goal is to create high refrigeration capacity for industrial-scale production and storage systems. To achieve optimal performance, system operation is based on... overheating cycle This is a crucial factor in enhancing individual cooling efficiency and ensuring absolute equipment safety. Instead of using numerous separate air conditioners that waste electricity, installing a central cooling system with a high-capacity compressor is the optimal solution for factories, buildings, and industrial zones.
Currently, the compressor models at Tan Long Widely applied in many key fields:
- Food preservation: Provide a cooling source for the system. cold storage for agricultural productsLarge-scale cold storage facilities for meat and seafood, ensuring product freshness at the lowest operating costs through optimization. overheating cycle.
- Central air conditioning system (HVAC): Providing cooling for chiller systems in high-rise buildings, shopping malls, and office complexes.
- Refrigerated transport: Installed on refrigerated trucks, ships, and specialized refrigerated containers in the cold chain supply.
- Heavy industry: Applications include petrochemical refineries and chemical processing plants – where refrigeration systems with exceptional durability and capacity are required.
In the Vietnamese market, Tan Long Refrigeration and Electrical Engineering Joint Stock Company We are a leading company specializing in importing and distributing major compressor types such as: scroll compressors, Piston compressor, screw compressor (Screw) and centrifugal compressors. All our equipment meets European quality standards, comes with professional after-sales service, and is ready to provide 24/7 repair and maintenance support to ensure our customers' systems always operate smoothly.
Hopefully, the information above has helped you better understand the device's applications and its importance. overheating cycle in compressor protection. If you are looking for the optimal solution for your business's refrigeration system, please contact us immediately. Tan Long Contact us for expert technical advice and the most detailed price quote.
