Chiller System Parameters and Analysis

Chillers are essential cooling systems designed to provide constant temperature, constant flow, and constant pressure for various applications. By injecting water into the tank, cooling it through the chiller's refrigeration system, and circulating it to the target equipment, the chiller ensures efficient heat transfer and cooling. As a professional chiller manufacturer, HuaZhao provides an in-depth look at Chiller System Parameters and Analysis, covering key operational details and troubleshooting tips.

Understanding Condensing Pressure and Temperature

The cooling medium used in the condenser significantly influences the condensing temperature and pressure.

• Water-Cooled Units:
  The condensing temperature is generally 4℃–8℃ higher than the cooling water outlet temperature. If this difference exceeds 8℃, inspect the condenser’s copper tubes for scale build-up.

• Air-Cooled Units:
  The condensing temperature is usually 5℃–10℃ higher than the outlet air temperature.

Key Insights on Condensing Pressure:

• As the condensing temperature rises, power consumption increases.

• The presence of air in the condenser reduces heat transfer efficiency, causing a temperature rise and making the condenser shell hot.

• Scale and sludge on the water side of condenser tubes impair heat transfer.

Best Practices:
Maintain cooling water temperature, flow, and quality within the recommended ranges to optimize condenser performance.

Cooling Water Pressure and Temperature

Under nominal working conditions:

• Inlet water temperature: 32℃

• Outlet water temperature: 37℃

• Temperature difference: 5℃

• Pressure drop at the condenser's inlet and outlet: ~0.07 MPa

Pressure Adjustment Tips:

1. Ensure the condenser outlet water has sufficient pressure to overcome pipeline resistance.

2. Avoid excessive cooling water flow as it may inadvertently increase energy consumption.

Water-Cooled Scroll Chiller Features

Water-cooled scroll chillers offer cooling capacities ranging from 9kW to 120kW.

Key Features:

• Equipped with fully enclosed scroll compressors.

• Integrated with high-efficiency heat exchangers.

• Automatically adjusted for load changes, ensuring energy efficiency.

Critical Chiller System Parameters

1. Discharge Head

The discharge head refers to the height to which the pump can circulate water vertically.

Considerations:

• Pumps must be selected based on the building height.

• An excessive discharge head can increase energy consumption and damage piping.

2. Delta T

Delta T is the temperature difference between two points in the system.

• High Delta T: Indicates efficient operation.

• Low Delta T: Also called low delta T syndrome, reduces efficiency and increases energy consumption.

Causes of Low Delta T:

• Oversized components (chillers, pumps, coils, etc.).

• Dirty air filters or cooling coils that restrict airflow.

Troubleshooting Low Delta T

Low delta T is common over prolonged operation but can be mitigated by:

• Ensuring proper maintenance of filters and coils.

• Right-sizing components based on manufacturer specifications.

Proper understanding and management of Chiller System Parameters and Analysis ensure efficient operation and energy savings. Whether it's maintaining ideal condensing pressure or addressing low delta T syndrome, attention to detail is key to maximizing the performance of a chiller system.

By following these insights, you can keep your chiller system running optimally while minimizing energy consumption and operational disruptions. If you have any questions about your chiller during operation, please do not hesitate to practice HuaZhao, our professional technical team is ready to answer for you!