Intelligent water temperature control of large-scale screw chillers for industrial centralized processes

1、 Company Introduction
The industrial chillers produced by Shenzhen Bond Refrigeration are technology oriented, forming a source of quality control based on procurement, production, and quality. The materials used in the industrial chillers produced by the company are all brand new products from internationally renowned brands, achieving quality and value. After decades of technological and market accumulation, the company currently has after-sales service points and marketing centers in major cities across the country, truly achieving the goal of serving customers from the customer's perspective.
The product features are as follows:
1. The industrial chillers produced by our company basically cover the entire line of products used by customers, ranging from 1 to several hundred pieces can be produced
2. The temperature control accuracy of the chiller can achieve ± 0.1 ℃ water outlet temperature control. 3. It adopts PLC automation control program to achieve intelligent temperature control and one click start. 4. The core refrigeration components of the compressor are internationally renowned brand compressors, which operate stably and have a long service life. 5 All electrical components are made of internationally renowned brand Schneider electrical components

2、 The selection process of the chiller is as follows:
Generally, customers only know their required cold water temperature and required chilled water flow rate. According to national standards, the calculation method is as follows:
Q=CM △ T
Among them, Q is the cooling capacity we need, and the cooling capacity calculated by this formula is in KJ/h, which needs to be converted into KW
C is the specific heat capacity of the medium, which is a constant. Taking water as an example, the specific heat capacity of water is 4.2KJ/(KG. ℃)
M is the mass flow rate of the refrigerant carrier
△ T is the temperature difference between the ice water we need. For example, if we need the ice water temperature to be 7 ℃, 7 ℃ before entering the machine for use, and 12 ℃ when exiting the equipment, then △ T=12-7=5 ℃. Generally, the heat exchange temperature difference for equipment is around 5 ℃.
For example, a certain device requires an ice water temperature of 7 ℃ and a flow rate of 30m ³/ h. The refrigerant is water
So we use the formula: Q=CM △ T
Among them: C=4.2KJ/(KG. ℃)
M=10 * 1000=30000kg/h
△ T=5 ℃
Q=4.2 * 30000 * 5=630000KJ/H converted to KW is 630000/3600=175KW
Choosing a 50 horsepower screw chiller from our company Bond Refrigeration can meet the cooling capacity requirements.

3、 The common specifications of chillers are as follows
Model number, cooling capacity (KW), standard water supply temperature (℃), chilled water flow rate (m ³/ h) Water pump head (m) Compressor power (KW)
BD-F-40 40 140



7 ℃ 25 19-50 30
BD-F-50 50 180 32 19-50 39
BD-F-60 60 200 35 19-50 45
BD-F-70 70 230 41 19-50 55
BD-F-80 80 260 45 19-50 60
BD-F-100 100 320 56 19-50 75
BD-F-120 120 420 73 19-50 88
BD-F-150 150 550 100 19-50 115
Note: The above refrigeration capacity and compressor power refer to data under national standard operating conditions

4、 Executive standards
1. National Standard of the People's Republic of China - Steam Compression Cycle Cold Water (Heat Pump) Units (GB18430.1-2007)
2. Mechanical Industry Standard of the People's Republic of China - Chillers (JB/T 7229-94)
3. National Energy Efficiency Testing Standard GB/T 14294-1993
4. Insulation Voltage Impulse and Voltage Withstand Test IEC255-5
5. Metal Tubular Electric Heating Elements JB/T2379-1993
6. Protection Level IEC529
7. Electrostatic Discharge Test IEC255-22-2
8. Code for Construction and Acceptance of Electrical Equipment Installation Engineering Panel, Cabinet and Secondary Circuit Wiring GB50171-92
9. Safety Technical Requirements for Chiller Units GB10891-1989
10. Code for Construction of Cold Water Systems (GB/T19411-2003)

5、 Common troubleshooting
Troubleshooting and solutions for possible parts of fault alarm information
The high pressure alarm of the unit may cause damage to the cooling fan and condensing fins, or the cooling fins may be dirty or blocked. Check whether the cooling fan is working and whether the cooling fins are dirty or blocked
The low pressure alarm of the unit may be caused by refrigerant leakage or low flow rate of ice water. Observe the low pressure pressure gauge and check the chilled water pump and filter for blockage
Compressor overload alarm may be triggered by refrigerant or excessive refrigerant charge or compressor jamming. Observe whether the high and low pressure gauges of the unit are normal and measure whether the resistance value of the compressor is normal
Water flow switch alarm Ice water flow insufficient Ice water flow insufficient Ice water flow will cause unit water flow switch alarm Check if the ice water system of the unit is unobstructed
Low outlet temperature alarm, insufficient ice water flow rate, insufficient ice water flow rate, will cause the unit water flow switch to alarm, check if the ice water system of the unit is unobstructed
Note: The above alarm information and troubleshooting plan can only be used for simple daily inspections. If there is any alarm information, please contact the manufacturer for troubleshooting as soon as possible.