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Anhui Noran Technology Co., Ltd.

Variable Frequency Falling Film Screw Chiller

Efficient Cooling for Variable Loads

Noran Variable Frequency Falling Film Screw Chiller combines falling film evaporation technology with variable frequency screw compression for efficient and flexible cooling.

The falling film evaporator helps reduce refrigerant charge while maintaining efficient heat transfer. Variable frequency control adjusts cooling capacity according to actual demand, making the system well-suited to changing cooling loads and long operating hours.

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  • Description
  • Specification
  • Application
  • Case Study
  • FAQ

1. Key Advantages

A. Lower Refrigerant Charge

The falling film evaporator distributes refrigerant over the heat exchange tubes, reducing the refrigerant inventory compared with conventional flooded designs.

B. Efficient Heat Transfer

A thin refrigerant film continuously evaporates over the heat exchange surface, supporting efficient heat transfer.

C. Variable Capacity Control

The variable frequency screw compressor automatically adjusts capacity according to the actual cooling load, improving efficiency during partial-load operation.

D. Reliable Industrial Operation

Designed for long-running industrial and centralized cooling systems with changing production demands.


2. Falling Film vs. Flooded Evaporation

Both technologies provide efficient evaporative cooling, but their design priorities are different.

 

Falling Film

Flooded

Evaporator Design

Refrigerant forms a film over the heat exchange tubes

Tubes are immersed in liquid refrigerant

Refrigerant Charge

Lower

Relatively higher

Heat Transfer

Efficient

Efficient

Load Adaptability

Excellent when combined with variable frequency control

Well suited to stable high-load operation

Typical Focus

Variable loads, efficiency and refrigerant optimization

Large and stable cooling loads


For facilities with frequent load changes and long operating hours, the combination of falling film evaporation and variable frequency compression can provide a particularly attractive solution.

3. Key Features

  • Falling Film Evaporator
  • Variable Frequency Screw Compressor
  • High-Efficiency Heat Exchangers
  • Electronic Expansion Valve
  • Intelligent Capacity Control
  • Optimized Refrigerant Charge
  • Customized Industrial Configuration
Model NLSW 310UMD 380JMD 420JMD 460JMD 540JMD 610JMD 700UMD 760UMD 820UMD 1090JMS 1210JMS 13307JMS 16307JMS
Refrigerating capacity KW 308 379 421 456 544 607 693 763 815 1088 1214 1526 1630
Kcal/h(x10^4) 26.5 32.6 36.2 39.2 46.8 52.2 59.6 65.6 70.1 93.6 104.4 131.2 140
RT 88 108 120 130 155 173 198 218 233 311 347 436 466
COP energy efficiency ratio 6.25 6.36 6.38 6.36 6.45 6.51 6.66 6.66 6.66 6.45 6.51 6.51 6.66
Compressor Form Advanced asymmetric semi-sealed twin-screw type
Cooling input power 49.3 59.5 66.1 71.7 84.3 93.3 104 115 122 168.6 186.6 230 244
Refrigeration operating current 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9 88.9
Capacity control 0-25%-50%-75%-100%(25% for Start Up)
Number of compressors 1 1 1 1 1 1 1 1 1 2 2 2 2
Condenser Form Efficient external threaded shell-and-tube type
Cooling water flow rate 80 98 110 119 141 158 179 198 211 282 316 396 422
Water pipe interface DN125 DN125 DN125 DN150 DN150 DN150 DN150 DN200 DN200 DN200 DN200 DN250 DN250
Water pressure drop 50 50 55 55 60 60 60 65 65 65 65 70 70
Evaporator Form Efficient falling film type
Refrigerant flow rate 53 65 72 78 94 104 119 131 140 188 208 262 280
Water pipe interface DN125 DN125 DN125 DN150 DN150 DN150 DN150 DN200 DN200 DN200 DN200 DN250 DN250
Water pressure drop 50 50 55 55 60 60 60 65 65 65 65 70 70
Throttling mode Electronic expansion valve
Safety protection device High and low voltage protection, anti-icing, overheating protection (dual), safety valve, overload protection, under phase, reverse phase, under voltage, over voltage, water flow protection, etc.
Cryogen R22
Dimension L (mm) 3200 3600 3600 3600 3700 3700 3700 3700 3700 4420 4500 4800 5090
W (mm) 1070 1100 1150 1200 1200 1200 1250 1300 1300 1500 1500 1700 1840
H (mm) 1640 1640 1700 1700 1750 1750 1950 1930 1940 1751 1960 1980 2040
Noise value dB(A) 67 67 67 68 69 70 70 71 71 71 71 72 72
Overall quality Kg 2400 2600 2700 2800 2900 3000 3300 3500 3800 5800 6000 6600 7000
Running weight Kg 2850 3050 3200 3350 3400 3500 3650 3900 4200 6800 7000 7300 7800



Rating Conditions: 

Chilled water inlet/outlet: 12°C / 7°C; cooling water inlet/outlet: 30°C / 35°C; Refrigerant: R22/ R410/R134a / Optional refrigerant according to market requirements. Noise measurements were taken 2 m in front of the main unit at a height of 1.5 m, and the average was calculated from the four points (front, back, left, and right). The standard power supply is 380 V, 50 Hz, 3P; other requirements can be customized.

Final specifications are selected according to cooling capacity and project operating conditions.

1. Designed for Variable Cooling Loads

This chiller is particularly suitable for customers who:

  • Operate multiple production lines with changing schedules
  • Experience significant variations in cooling demand
  • Run chillers for long periods under partial load
  • Require centralized cooling for multiple production areas
  • Focus on reducing long-term energy and operating costs

When cooling demand changes, the chiller adjusts with it.


2. Typical Applications

Chemical Processing · Pharmaceutical Manufacturing · Plastic Processing · Food & Beverage · Electronics · Automotive Manufacturing · Central Process Cooling · Large Manufacturing Facilities

Application:

ChemIcal fiber factory processing line cooling--- in Jiangsu, China

Cooling Capacity:233RT

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1. What is a falling film chiller?

A falling film chiller uses an evaporator where refrigerant forms a thin film over the heat exchange tubes and evaporates to absorb heat. It can provide efficient heat transfer with a lower refrigerant charge.

2. Why combine falling film evaporation with variable frequency control?

The falling film design focuses on efficient heat transfer and refrigerant optimization, while variable frequency control allows the compressor to match cooling capacity to the actual load.

3. Falling film or flooded — which is better?

Both have their advantages. Falling film is particularly suitable when lower refrigerant charge and flexible part-load operation are important. Flooded systems can be an excellent choice for large, stable cooling loads.

4. Is it suitable for industrial process cooling?

Yes. It is designed for large industrial facilities and centralized cooling systems where cooling demand varies with production conditions.

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Who We Are

Hangzhou Noran Machinery Equipment Co., Ltd. is China falling film screw chiller manufacturers and OEM variable frequency falling film chiller suppliers, founded in 2014, focusing on the R&D and manufacturing of high-end refrigeration equipment. In 2021, Anhui Noran Technology Co., Ltd. was established, with a 50-mu production base built in Mingguang, Anhui Province, continuously upgrading capabilities in R&D, manufacturing and project delivery.

Noran mainly supplies industrial water chillers, air coolers, mold temperature control systems, explosion-proof refrigeration units and magnetic levitation centrifugal units. Its products are widely used in powder coating, plastic mould, electronic photovoltaic, pharmaceutical chemical and other industries. Supported by technological innovation, university cooperation and patent reserves, we are committed to providing customers with stable, energy-saving and customizable industrial temperature control solutions.

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Industry knowledge

How to Select a Variable Frequency Water-Cooled Falling Film Screw Chiller

A falling film screw chiller combines screw compression with falling film evaporation to provide cooling for industrial processes. A water cooled falling film chiller rejects heat through a water-cooled condenser, while variable frequency control adjusts compressor speed to respond to changing cooling demand. These features can be useful in plastics processing, chemical production, electronics manufacturing, and other applications requiring stable process temperatures.

When evaluating a falling film screw chiller, buyers should consider cooling capacity, chilled water temperatures, condenser water conditions, operating load, and maintenance requirements rather than relying on nominal capacity alone.

How Falling Film Evaporation Works

A falling film evaporator chiller distributes liquid refrigerant over a heat-transfer surface. As the refrigerant flows downward and absorbs heat from the chilled water, it evaporates and returns to the compressor as vapor. Compared with some flooded evaporator designs, falling film systems can operate with a lower refrigerant inventory, depending on the equipment configuration.

A variable frequency falling film chiller uses a variable frequency drive to adjust compressor speed within its permitted operating range. This can improve capacity matching during part-load operation, although actual energy savings depend on compressor efficiency, refrigerant conditions, condenser performance, and the operating profile.

Key Technical Comparisons

Comparison Falling Film Design Flooded Design
Refrigerant arrangement Liquid refrigerant flows as a film over the heat-transfer surface. Heat-transfer surfaces are immersed in a refrigerant pool.
Refrigerant inventory Can be lower, depending on system design. Generally requires refrigerant to maintain the evaporator pool.
Maintenance focus Refrigerant distribution and surface wetting. Refrigerant level and liquid management.
Performance factors Film distribution, heat-transfer area, and operating load. Refrigerant circulation, liquid level, and heat-transfer conditions.

Neither design is universally more efficient. A suitable falling film refrigeration system must be evaluated under comparable cooling and condenser water conditions.

Selection and Maintenance Considerations

  • Cooling capacity: Calculate peak process heat load and account for changes in production demand.
  • Water temperatures: Specify chilled water inlet and outlet temperatures, flow rates, and condenser water conditions.
  • Compressor control: Confirm the VFD screw chiller operating range and minimum stable cooling load.
  • Water quality: Manage scale, corrosion, and biological fouling to protect heat-transfer performance.
  • System configuration: Evaluate installation space, electrical supply, service access, and control requirements.

Buyers comparing a falling film screw chiller manufacturer or falling film chiller supplier should request operating data at their actual design conditions. A custom falling film screw chiller may be appropriate when standard configurations do not match the required capacity, temperature accuracy, or installation environment.

Frequently Asked Questions

1. What information is required to select a falling film evaporator chiller?

Provide the required cooling capacity, water temperatures, flow rates, operating schedule, and site conditions. Anhui Noran Technology Co., Ltd. develops industrial refrigeration equipment and customized temperature control solutions based on customer requirements.

2. Does variable frequency control reduce chiller energy consumption?

It can reduce energy consumption when cooling demand varies, but results depend on the operating conditions and complete system design. Noran focuses on energy-saving refrigeration technologies and intelligent temperature control for industrial applications.

3. Which industries can use water-cooled falling film screw chillers?

Potential applications include plastics, chemicals, pharmaceuticals, electronics, photovoltaics, and industrial painting. Founded in 2014, Noran expanded its manufacturing operations to a production base of approximately 33,000 m2 in Mingguang City, Anhui Province, supporting its industrial refrigeration equipment and customized cooling business.