Water Cooled Screw Chillers
Water Cooled Screw Chiller – High-Capacity Cooling Built for Heavy-Duty Performance
When cooling demand is high, operating hours are long, and temperature stability is non-negotiable, a water cooled screw chiller becomes the backbone of the system. Designed for large industrial and commercial loads, water cooled screw chillers deliver unmatched reliability, superior energy efficiency, and smooth capacity control across varying conditions.
For industries where downtime means production loss, quality issues, or energy wastage, screw chillers are not a luxury—they are a necessity.
In this detailed guide, we explain what a water cooled screw chiller is, how it works, why it outperforms other chillers at high capacities, how to calculate TR, and how to select the right model for your application.
What Is a Water Cooled Screw Chiller?
A water cooled screw chiller is a centralized refrigeration system that uses screw compressors and water as the heat-rejection medium. Heat removed from the process or HVAC system is transferred to condenser water and discharged through a cooling tower. Unlike scroll or reciprocating compressors, a screw compressor uses two intermeshing helical rotors to compress refrigerant in a smooth, continuous motion. This design allows the chiller to handle large cooling loads with high efficiency and long service life. Water cooled screw chillers are commonly used in capacities ranging from 40 TR to 500 TR and beyond.
Why Industries Prefer Water Cooled Screw Chillers
Customers choose screw chillers because they are built for performance, not compromise.
Key Reasons
- Designed for 24/7 continuous operation
- Excellent performance under heavy and fluctuating loads
- Lower operating cost per TR at higher capacities
- Precise temperature control for critical processes
- Long compressor life with minimal wear
If your plant cannot afford unstable cooling, a screw chiller is the safest investment.
Advantages of Water Cooled Screw Chillers
Water Cooled Screw Chillers offer superior efficiency and smooth capacity control for large cooling loads. Perfect for industries requiring continuous, high-performance cooling with minimum downtime.
One
Best Efficiency at High Capacity: At large TR requirements, screw chillers offer lower kW/TR than scroll or reciprocating chillers.
Two
Excellent Reliability: Ideal for industries running non-stop production shifts. Minimal mechanical stress compared to piston-type compressors.
Three
Smooth Capacity Control: Unlike ON/OFF operation, screw chillers adjust capacity smoothly, saving energy and reducing wear.
Process of Water cooled Screw Chiller
Working Principle of a Water Cooled Screw Chiller
A water cooled screw chiller operates on the vapour compression refrigeration cycle, enhanced by water-based heat rejection.
Step-by-Step Process
1. Heat Absorption (Evaporator)
Chilled water absorbs heat from machines, molds, or air-handling units. The refrigerant inside the evaporator absorbs this heat and evaporates.
2. Compression (Screw Compressor)
Low-pressure refrigerant gas enters the screw compressor. The twin rotors compress the gas smoothly, producing high-pressure, high-temperature refrigerant vapour.
3. Heat Rejection (Condenser)
The hot refrigerant releases heat to condenser water flowing through a shell & tube condenser. This warm water then flows to the cooling tower.
4. Expansion
The refrigerant passes through an expansion valve, reducing pressure and temperature before returning to the evaporator.
This cycle runs continuously to maintain stable chilled water temperature.
How to Calculate TR for a Water Cooled Screw Chiller
Correct TR calculation ensures proper performance and energy efficiency.
Basic TR Formula
TR = (Flow Rate × 4.187 × ΔT) / 3024
Where:
Flow Rate = Water flow in m³/hr
ΔT = Temperature difference (°C)
4.187 = Specific heat of water
Simple Customer Example (Easy to Understand)
Application
Injection molding plant cooling hydraulic oil heat exchanger.
Given Data
Water flow rate: 60 m³/hr
Chilled water inlet temperature: 12°C
Chilled water outlet temperature: 7°C
Temperature difference (ΔT): 5°C
TR Calculation
TR = (60 × 4.187 × 5) / 3024
TR = 1256.1 / 3024
TR ≈ 41.5 TR
Recommended Chiller
A 50 TR water cooled screw chiller is selected to:
Handle peak load
Allow future expansion
Maintain stable performance
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Key Components & Applications
Why Screw Chiller Is Ideal for This Application
Continuous operation (24/7 shifts)
High and steady load
Better energy efficiency at 40+ TR
Long compressor life
Lower operating cost over time
Scroll chillers would struggle under such load, while reciprocating chillers would result in higher maintenance.
Energy Efficiency & Operating Cost Benefits
Water cooled screw chillers offer:
Lower power consumption per TR
Reduced energy bills
Better performance in hot climates
Consistent efficiency throughout the year
Maintenance & Service Requirements
Proper maintenance ensures long life:
Cooling tower water treatment
Periodic condenser tube cleaning
Oil analysis and replacement
Control panel inspection
Leak detection and refrigerant checks
Applications of Water Cooled Screw Chillers
Water cooled screw chillers are used where cooling demand is high and continuous.
Plastic & Injection Molding Plants
Maintains mold, oil, and hydraulic temperature for consistent product quality.
Pharmaceutical & Chemical Industries
Precise temperature control for reactors and process lines.
Food & Beverage Processing
Used in breweries, dairy plants, cold processing, and bottling lines.
HVAC Systems
Ideal for hospitals, malls, airports, data centers, and hotels.
Rubber, Tyre & Extrusion Plants
Handles heavy thermal loads efficiently.