LSBLGZ screw type medium and low temperature chiller unit

LSBLGZ screw type medium and low temperature chiller unit

Unit characteristics:
1. Screw compressor:
○ Internationally renowned brand semi enclosed twin-screw refrigeration compressor.
High efficiency 5:6 patented asymmetric tooth profile.
○ It has four stage capacity adjustment or stepless capacity adjustment.
○ High precision SKF and FAG zero clearance bearings.
The built-in oil separator adopts a double-layer filtration method, with excellent oil filtration effect, and the heat exchanger can achieve the best effect.
The motor adopts high-efficiency silicon steel and special groove design, equipped with internal and external omnidirectional cooling channels and minimum inlet and outlet pressure drop design, making the compressor highly efficient;
○ Built in differential pressure oil supply and lubrication system to reduce vulnerable parts;
Axial continuous gas transmission with patented exhaust chamber design reduces vibration and noise.
2. Electrical control:
Internationally renowned brand electronic control components and industrial grade programmable controllers.
○ Large screen LCD display, displaying various operating parameters of the control equipment.
Automatic protection functions such as high and low voltage protection, oil level protection, exhaust overheating, motor overheating, overcurrent protection, phase loss, reverse phase protection, water cut-off protection, and antifreeze protection ensure the high reliability of product operation.
○ It has control functions such as equal wear and tear switching, cumulative running time recording, fault display and locking, current temperature display, historical temperature trend and recording, timed start and stop, etc. At the same time, it can provide standard backup interfaces with remote control functions according to user requirements, ensuring high automation of product operation.
3. Heat exchanger:
The high-efficiency shell and tube heat exchanger designed through computer optimization has achieved parameter optimization, ensuring the best heat transfer effect and ensuring that the unit has a good energy efficiency ratio in a wide area.
The heat exchanger is designed with an increased fouling coefficient on the water side to ensure that the cooling capacity of the unit does not decrease during long-term operation.
4. Thermal expansion valve:
Adopting internationally renowned brands' precise control thermal induction expansion valves, the unit can achieve optimal efficiency at both full load and partial load, increasing energy efficiency by 5% to 10%.
5. Energy saving device:
Adopting internationally advanced stainless steel plate heat exchangers and shell and tube economy heat exchangers with independent intellectual property rights can effectively improve refrigeration capacity by 15% -20%.
6. Reliable and comprehensive testing:
After assembly, it undergoes strict air pressure leak testing.
Continuous 24-hour pressure holding test.
○ Multi system (including dual system) unit 24-hour cavity pressure holding test.
○ Full load test with fluorine.
7. Convenient transportation, installation, and debugging:
All products are shipped with fluorine. After the equipment is installed in place, connect the water pipe and power cord, and press the power button to achieve normal operation of the product.
○ Small size greatly reduces the space required for installation in the computer room.
8. Developed based on extensive design experience, the energy efficiency ratio of the unit is relatively high.
Working principle of screw type medium and low temperature chiller:

Performance parameters of LSBLGZ screw type medium and low temperature chiller:

Model number		LSBLGZ 55	LSBLGZ 75	LSBLGZ 95	LSBLGZ 110	LSBLGZ 120	LSBLGZ 150	LSBLGZ 150D	LSBLGZ 175
Refrigeration capacity	KW	55	75	95	110	120	150	150	175
Input power	KW	21.0	27.0	32.5	40.5	42.0	52.0	54.0	57.5
Model number		LSBLGZ 190	LSBLGZ 190D	LSBLGZ 230	LSBLGZ 240	LSBLGZ 280	LSBLGZ 300	LSBLGZ 340	LSBLGZ 350
Refrigeration capacity	KW	190	190	230	240	280	300	340	350
Input power	KW	66.2	65.0	81.0	83.3	93.0	104.0	111.6	115.0
Model number		LSBLGZ 380	LSBLGZ 380D	LSBLGZ 440	LSBLGZ 480	LSBLGZ 480D	LSBLGZ 560	LSBLGZ 670	LSBLGZ 750
Refrigeration capacity	KW	380	380	440	480	480	560	670	750
Input power	KW	124.8	132.4	151.2	160.0	176.6	186.0	223.2	249.6
Model number		LSBLGZ 880	LSBLGZ 950	LSBLGZ 1120	LSBLGZ 1320	LSBLGZ 1420	/	/	/
Refrigeration capacity	KW	880	950	1120	1320	1420	/	/	/
Input power	KW	302.4	320.0	374.4	453.6	480.0	/	/	/

Note: Medium temperature refrigeration conditions: chilled water inlet temperature -5 ℃, chilled water outlet temperature -10 ℃; The inlet temperature of the cooling water is 30 ℃, and the outlet temperature of the cooling water is 35 ℃.
The refrigerant is ethylene glycol solution.
Low temperature refrigeration condition: inlet temperature of chilled water -25 ℃, outlet temperature of chilled water -20 ℃; The inlet temperature of the cooling water is 30 ℃, and the outlet temperature of the cooling water is 35 ℃.
The refrigerant is ethylene glycol solution.

Correction factor for different outlet temperatures of chilled water:

Outlet water temperature℃	2	0	-5	-10	-15	-20	-25	-30	35
Refrigeration capacity	1.58	1.48	1.26	1.0	0.828	0.667	0.55	0.41	0.33
Flow rate of chilled water	1.55	1.45	1.24	1.0	0.833	0.672	0.57	0.43	0.34
Cooling water flow rate	1.38	1.32	1.20	1.0	0.879	0.845	0.81	0.62	0.48
consume power	1.08	1.075	1.03	1.0	0.973	0.942	0.90	0.77	0.63