The operation of the industrial chiller system is accomplished through three interconnected systems: a refrigerant circulation system, a water circulation system, and an electrical control system.
Refrigeration cycle system:
The liquid refrigerant in the evaporator absorbs the heat in the water and begins to evaporate. Finally, a certain temperature difference between the refrigerant and the water is generated, and the liquid refrigerant is completely evaporated into a gaseous state, which is then sucked and compressed by the compressor (pressure and temperature increase). The high temperature gaseous refrigerant dissipates heat through an air-cooled condenser or a water-cooled condenser, and the temperature drops and condenses into a liquid. After the throttle valve (or capillary tube) is throttled, it becomes a low-temperature low-pressure refrigerant and enters the evaporator to complete the refrigerant cycle.
water circulatory system:
The pump is responsible for pumping water from the tank to the equipment that the user needs to cool. The chilled water takes the heat away and the temperature rises before returning to the chilled water tank.
Electrical control system:
Includes power section and automatic control section. The power supply part supplies power to the compressor, fan, water pump, etc. through the contactor.
The automatic control part includes the combination of temperature controller, pressure protection, delay device, relay, overload protection, etc. to achieve automatic adjustment and protection according to water temperature.
DUPLEX STAINLESS STEEL
Duplex Stainless Steels Available
Yuhong Group supplies LDX2101, 2205, Ferralium 255, Zeron 100 and LDX2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire.
Duplex Stainless Steel Overview
Duplex Stainless Steels, also referred to as austenitic-ferritic stainless steels, are a family of grades with about equal proportions of ferrite and austenite. These steels have a duplex microstructure which contributes to their high strength and high resistance to stress corrosion cracking. Due to their high content of chromium, nitrogen and molybdenum, duplex steels offer good resistance to local and uniform corrosion. Duplex stainless steels have good weldability.
Today, modern duplex stainless steels can be divided into three groups:
Lean Duplex such as LDX2101
Standard Duplex such as 2205, the work-horse grade accounting for more than 80% of duplex usage
Super Duplex such as Ferralium 255 and Zeron 100 and LDX2507
Of the duplex grades, duplex 2205 is the most widely used. However, the super duplex steels like Zeron® 100 and LDX2507 are excellent for servicing severe corrosive environments, such as offshore and marine applications. Lean duplex 2101 is available as an economic alternative to 300 series stainless steels.
What are the Characteristics of Duplex Stainless Steels ?
Very good resistance to uniform corrosion
Very good resistance to pitting and crevice corrosion
High resistance to stress corrosion cracking and corrosion fatigue
High mechanical strength
Good sulfide stress corrosion resistance
Good abrasion and erosion resistance
Good fatigue resistance high energy absorption
Low thermal expansion
Good weldability
In what Applications are Duplex Stainless Steels® used ?
Oil and gas equipment
Offshore technology
Seawater desalination plants
Chemical industry, especially when handling chlorides
Flue-gas cleaning
Desalination plants and seawater systems
Pulp and paper industry
Cargo tanks and pipe systems in chemical tankers
Firewalls and blast walls on offshore platforms
Bridges
Storage tanks
Pressure vessels, reactor tanks, and heat exchangers
Rotors, impellers and shafts
Super Duplex Stainless Steel Heat Exchanger Tube
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