KSLD series ultra-low temperature screw freezer

KasselUltra-low temperature screw freezerspecifications

-125 degree medium-sized low-temperature unit (the table refers to the cooling capacity at -120 degree evaporation temperature)

1. The refrigeration capacity and cooling water flow rate indicated in the table refer to the parameters under the operating conditions of a cooling water inlet temperature of 30 degrees, an outlet temperature of 33 degrees, and an evaporation temperature of -120 degrees.
2. The flow rate of cooling water, the type and flow rate of refrigerant, etc. need to be determined by users according to their actual usage requirements.
When users deviate from the above standard operating conditions for a long time, it is necessary to adjust the flow of refrigerant and cooling water appropriately to ensure that the unit is in operation.

The refrigeration temperature range of ultra-low temperature freezer is from -80 ℃ to -125 ℃, with fast refrigeration speed, safety and reliability. It is used for rapid liquid refrigeration and is widely used in high-tech industries such as petrochemical, medical, pharmaceutical, biochemical, freeze-drying, pharmaceutical, etc.

2、 KasselUltra-low temperature screw freezerApplications
Pharmaceutical: synthesis, hydrolysis, esterification, etherification and other processes that require temperature control,
Chemical industry: liquefaction, crystallization and purification of gas, purification of essence, rubber crushing
Food: Cold storage Metal treatment: Low temperature quenching
Electronics: Component Environmental Testing
Aerospace: Component Environmental Testing
Transportation: Cooling Tunnel
Other refrigeration facilities with the same demand

3、 Kassel characteristics
reliable
Each refrigeration unit is designed to ensure performance and reliability based on the specific requirements of the user's refrigeration capacity and performance.
Select imported compressors such as Bitzer, Copeland, Siemens, Danfoss, etc
Using single-stage or two-stage compressors
Adopting single-stage and two-stage refrigeration systems
Adopting a pump free built-in pressure differential oil supply lubrication system, energy-saving, efficient, and reliable
The selected control components such as thermal expansion valves, solenoid valves, and one-way valves ensure the efficient and reliable operation of the unit over a wide range of operating conditions
Equipped with a liquid refrigerant injection system under low temperature conditions, it effectively reduces the workload and exhaust temperature of key components, and improves the reliability of the compressor
Equipped with functions such as hot gas bypass, energy regulation, and complete automatic protection (overvoltage, overheating, overload, reverse, etc.)
Large systems use open screw compressors with fewer moving parts and longer bearing service life; Small and medium-sized systems use single-stage semi closed piston compressors or two-stage screw compressors
The compressor adopts star delta voltage reduction starting under minimal load, effectively reducing the starting current and impact on the power grid
After comprehensive testing and full load operation test, the product is shipped with refrigerant to ensure that the equipment can start working after the water and electricity are in place

Efficient
Some heat exchangers use stainless steel plate heat exchangers, providing the largest heat exchange area in a compact space

Efficient heat exchange with heat exchangers
Adopting a split liquid supply method and a special arrangement of evaporator heat exchange tubes to ensure good oil return in the system

automatic control
A new control logic has been developed for the system, using a validated Siemens automation control system to provide warnings for critical system parameters
One click power on, automatic start stop, automatic load adjustment
Adopting high-precision large screen touch screen, industrial grade intelligent controller and computer control system, fully digital Han display, connected with external devices, remote users and control room through standard interfaces, the following control functions can be achieved:
(1) Multiple protections: compressor exhaust over temperature, motor over temperature, cold water anti freezing, etc. Temperature protection: overcurrent, phase loss, reverse phase, etc. Electrical protection: refrigerant system high and low voltage, oil level, water cut-off and other emergency state protection
(2) Necessary maintenance and management functions such as alarm, prompt, recording, and retrieval can be set for the above protection functions
(3) Automatic power on/off, automatically achieving unmanned operation management according to the predetermined work plan
(4) Multiple password settings ensure that the device will not shut down or be damaged due to accidental factors
(5) Realize remote data collection, operation inspection and control, fault diagnosis and other management functions through LAN or Internet

characteristic
Independent refrigeration system design, multi head units are relatively independent, with minimal moving parts and reliable operation
Adopting imported high-efficiency economical semi closed or open twin-screw compressors, with high energy efficiency, reliable operation, and long service life:
It can achieve graded or stepless energy regulation, with flexible and convenient control, energy saving, high efficiency, and easy maintenance
The compressor is equipped with an exhaust muffler to ensure low-noise operation of the unit
Installing an exhaust check valve at the exhaust port can prevent the rotor from reversing during shutdown
The flexible adjustable design enables continuous energy regulation (stepless energy regulation) of the unit between 25% and 100%, ensuring the maximum efficiency of the compressor and helping users save operating costs to the greatest extent possible
Condenser: The washable water-cooled condenser adopts reinforced heat exchange tubes with an outer diameter of 19mm (inner fins and outer ribs), which are expanded on the tube plate. The water side is designed to withstand a pressure of 10 bar, and the fluorine side is designed to withstand a pressure of 25 bar. It is also equipped with a safety valve to ensure the safety of the equipment.
Evaporator: Adopting a dry direct expansion evaporator, fluorine flows inside the enhanced heat exchange tube, and the water side is designed with a pressure of 10 bar; The design pressure on the fluorine side is 25 bar. The evaporator is wrapped with 40-60mm thick soft closed cell rubber sponge insulation material, which effectively prevents heat transfer between the evaporator and the outside air of the machine room, reducing energy loss.
Condensation evaporator: A dry direct expansion evaporator is used, with the cold side flowing inside the enhanced heat exchange tube at a design pressure of 16 bar and the hot side inside the shell at a design pressure of 25 bar. The shell is wrapped with 40mm thick soft closed cell rubber sponge insulation material, which effectively prevents heat transfer with the outside air and reduces energy loss.
Oil separator: A centrifugal spiral secondary oil separator is used to further separate the refrigerant oil in the exhaust, improving the reliability and heat transfer efficiency of the equipment and enhancing efficiency.
Electrical control: All components for starting and controlling the unit are installed in the electrical control box, wired and functionally tested by the factory. The electrical control part includes: touch screen, Siemens PLC controller, main contactor, molded case circuit breaker, etc. The equipment is equipped with an emergency stop device to ensure the safety of the operators.
Water flow switch: The equipment is equipped with two target type water flow switches at the factory, which are connected to the cooling water and chilled water pipelines to ensure automatic shutdown of the equipment in case of water shortage or interruption.