IC Factory Chiller System Optimization: Practical Experience Saving 50% Summer Electricity Bills

Created2026-03-18|Updated2026-06-30|HVAC

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IC Factory Chiller System Optimization: Practical Experience Saving 50% Summer Electricity Bills

Summer is here, and chillers (water chillers) become the main electricity expense. A 1000kW chiller running for one day costs about 16,000 RMB. This article shares practical chiller energy optimization experience.

1. How High Is Chiller Electricity Cost?

Daily Operating Cost:

1,000kW × 20 hours × 0.8 RMB/kWh = 16,000 RMB/day
Approximately 480,000 RMB per month

2. Common Problem Analysis

1. Oversizing “Large Horse Pulling Small Car”

Selected for maximum load, usually unnecessary
Large production fluctuations, summer/winter load differs by 50%
Long-term low-load operation, low efficiency

2. Inefficient Cooling Tower

Common Problems:

Uneven water distribution
Aging filler
Loose fan belts
Pipe scaling

Impact: 10% efficiency loss = 5% more electricity cost

3. Rough Control Strategy

Temperature set and forgotten
Cooling pumps/towers always running at full capacity
Lack of group control optimization

3. Energy Saving Solutions

1. Chiller VFD Transformation

Add VFD to centrifugal chillers
Dynamically adjust power based on load
Save over 15% on average

2. Cooling Tower Fan VFD

Adjust fan speed based on cooling water temperature
Save 5%-8%

3. Group Control Optimization

Link chiller, cooling tower, and cooling pump
Dynamically adjust based on outdoor wet bulb temperature
Save hundreds of thousands annually

4. Regular Heat Exchanger Cleaning

COP improves 10%-15% after cleaning
Clean at least once per year

4. Maintenance Warning Signs

Phenomenon	Possible Problem
Small inlet/outlet temp difference	Inefficient cooling tower/scaling
High operating current	Refrigerant abnormality
Sudden loud noise	Bearing wear
Abnormal vibration	Loose foundation

5. Summary

Key chiller energy saving points:

Don’t oversize during selection
VFD transformation is highest priority
Implement group control
Regular maintenance is essential

The author works in power operations at an IC packaging and testing facility, focusing on HVAC system energy optimization.

Author: Smart Facility

Link: https://smartfacility.tech/2026/03/18/chiller-optimization-2026/

Copyright Notice: All articles on this blog are licensed under CC BY-NC-SA 4.0 unless otherwise stated.

chiller central air conditioning HVAC energy saving

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