Screw Chiller

The air cooled screw chiller, a critical component in the refrigeration industry, stands out for its unique design and advanced technology. The air cooled screw chiller offers significant advantages in industrial production and commercial sectors. Below are the key features of the air-cooled screw chiller.   1. High-Efficiency Cooling Equipped with a screw compressor, the air cooled screw chiller uses a rotor structure that enables the refrigerant gas to be compressed efficiently and smoothly. It has a large compression ratio and a broad range of cooling capacity, making it suitable for medium to large-scale cooling needs. The screw chiller can quickly and steadily provide low-temperature cooling, meeting the requirements of various processes and spaces. Hengde has optimized the design of its screw compressors, choosing imported semi-hermetic twin-screw compressors. Compared to traditional rotary compressors, these offer high efficiency, quiet operation, simple operation, and long service life.    2. Air-Cooled Heat Exchange, No Water Source Required Unlike water cooled screw chillers, air cooled screw chillers use air as the heat exchange medium. A fan drives the airflow through the condenser, enabling the refrigerant to exchange heat with the external air. This feature eliminates the need for a complex cooling water system, making installation and use more convenient, especially in areas where water is scarce or where it is difficult to install water cooling pipes, such as remote industrial plants or commercial buildings in water-deficient regions. Hengde has innovated the design of the air ducts, employing high-efficiency, low-noise fans and optimized heat exchange fins, ensuring effective heat dissipation while reducing noise, thus providing users with a quieter and more comfortable environment.   3. Easy Installation With a compact overall structure and small footprint, the air-cooled screw chiller doesn’t require specialized cooling towers, water pumps, or water piping systems. Once the unit arrives at the site, it only needs simple positioning and electrical connections before being quickly put into operation. This greatly reduces installation time, costs, and engineering complexity. Hengde’s air-cooled screw chillers undergo strict pre-commissioning before leaving the factory to ensure the reliability and stability of all components. The company also provides detailed installation manuals and professional technical support, making it easy even for first-time users to install and start the unit.   4. Stable and Reliable Operation The unit uses internationally renowned refrigeration components to ensure quality and operational stability. The evaporator and condenser are made with the latest high-efficiency spiral heat exchange copper tubes, which have a high heat transfer coefficient, ensuring excellent cooling performance. The air-cooled chiller is controlled by a microcomputer programmable controller, and its compressor features a multi-stage energy adjustment system that precisely controls the matching of cooling capacity and load in real-time.   5. Convenient Maintenance The components of the air-cooled screw chiller are logically arranged, making them easy for maintenance personnel to access and operate. Major components, such as the compressor, condenser, and evaporator, have independent service spaces, making routine inspections, cleaning, and maintenance easier. Additionally, the intelligent control system can send fault alerts, helping maintenance personnel quickly identify and resolve issues, reducing maintenance difficulty and costs. Hengde's screw chillers feature independent refrigeration circuits that can be maintained and repaired separately without affecting the operation of the entire unit. The professional after-sales service team is always ready to respond to maintenance needs, ensuring the unit operates at its best.   6. Energy-Efficient and Environmentally Friendly With continuous technological advancements, modern air-cooled screw chillers incorporate high-efficiency heat exchangers and energy-saving compressors, improving energy utilization and reducing energy consumption. Their air-cooled heat exchange system also avoids environmental pollution caused by cooling water discharge, aligning with current trends in energy conservation and environmental protection. Hengde actively responds to national energy-saving and environmental protection policies by exploring and applying new energy-efficient materials and technologies during product development. As a result, Hengde’s air-cooled screw chillers achieve industry-leading energy efficiency, helping customers reduce operational costs while contributing positively to environmental conservation.   With features such as high-efficiency cooling, easy installation, stable operation, convenient maintenance, and energy efficiency, the air-cooled screw chiller is an ideal choice for refrigeration needs across various industries. Hengde, known for its technological innovation, product quality, and exceptional after-sales service, has become a trusted choice for customers when selecting air-cooled screw chillers. The company provides reliable cooling solutions that support production and everyday life across diverse sectors.   Choose Hengde, Choose Perfect Air Cooled Screw Chillers!

Screw-type industrial chillers play a crucial role in industrial production by providing stable cooling support for various processes. Proper installation is the foundation for ensuring efficient and stable operation. With extensive expertise in the refrigeration industry, Hengde provides a comprehensive and detailed guide for installing screw-type industrial chillers.   1. Choosing the Right Environment Select a dry, well-ventilated, and level installation site. Hengde recommends keeping the site away from heat sources, water sources, and flammable or explosive materials to ensure operational safety. Additionally, allow sufficient space around the equipment for easy operation, maintenance, and inspection. Generally, a clearance of at least 1m - 1.5m should be maintained around the unit.   2. Ensuring a Stable Power Supply Verify that the onsite power supply meets the chiller's requirements, including voltage, frequency, and phase configuration. The screw-type chiller operates on a three-phase four-wire power system: (R, S, T) for live wires (N) for neutral (G) for ground Hengde’s water cooled screw chillers and air cooled screw chillers use high-quality electrical components that are highly adaptable to power fluctuations. However, a stable and reliable power supply is still essential. Each unit is factory-equipped with comprehensive grounding protection and pre-configured settings, making it easy for users to connect according to specifications.   Additional Considerations for Industrial Screw Chiller Installation 1. Equipment Inspection & Site Selection Before installation, inspect the equipment for any damage. Choose a location that allows easy installation and maintenance. Ensure the ground is level, with a maximum unevenness of 6.4mm, and that it can support the chiller's operating weight.   2. Piping Selection & Connection Choose the appropriate pipe diameter based on the chiller’s maximum power requirements. Ensure the cooling water system and chilled water system are correctly connected.   3. Room Environment Requirements The chiller should be installed in a room with a temperature range of 4°C to 43°C. Leave adequate space around the unit for routine maintenance.   4. Pipeline Design & Installation Follow standard guidelines for installing chilled water and cooling water pipelines. Install the chilled water pump on the inlet pipe to maintain stable pressure and flow inside the unit. Use vibration dampers in the piping system to prevent water hammer effects in the evaporator when the system stops.   Final Commissioning After Installation 1. Equipment Inspection Before starting the chiller, conduct a comprehensive inspection to verify. Correct pipeline and electrical connections. Proper installation of all components.   2. Pre-Startup Preparation Add an appropriate amount of lubricant to the compressor. Check the refrigerant charge to ensure it meets the system’s requirements. Start the cooling water pump and chilled water pump to establish a normal water circulation system.   3. Equipment Commissioning Follow Hengde’s operation manual to start the chiller step by step. Closely monitor key parameters such as: Compressor sound and vibration Current draw Operating stability Adjust the operating parameters based on actual working conditions to achieve optimal cooling performance.   Hengde's Comprehensive Support Throughout the installation process of screw-type industrial chillers, Hengde provides full-scale technical support, including:  * Site planning & construction guidance * On-site technical support during installation * Commissioning and after-sales maintenance services   Hengde’s dedicated technical team works closely with customers to ensure smooth installation, delivering reliable cooling solutions for industrial production.

When customers contact Hengde about an industrial chiller, one of the most common questions is surprisingly simple: "Should I choose a screw chiller or a scroll chiller?" There isn't a universal answer. Both technologies are widely used in industrial cooling, and both can deliver reliable performance when selected for the right application. The real challenge is understanding how they behave under different production conditions rather than simply comparing specifications.   After supporting customers in plastics, chemical processing, pharmaceutical manufacturing, food production, and metal processing, we've found that the wrong decision usually isn't buying the "less powerful" machine—it's choosing a chiller that doesn't match the way the factory actually operates. Capacity Is Only Part of the Story Most buyers begin by comparing cooling capacity. While cooling capacity is obviously important, compressor type affects much more than how many kilowatts a chiller can produce. Scroll chillers are typically selected for small to medium cooling loads. Their compact design, fewer moving parts, and relatively simple structure make them a popular choice for injection molding machines, laser equipment, packaging lines, and laboratory cooling. Screw chillers, on the other hand, are commonly installed where cooling demand is continuous and significantly larger. Chemical plants, central cooling systems, large extrusion lines, and process cooling applications often benefit from the stability that screw compressors provide.   Capacity determines whether the machine can cool your process. Compressor type determines how efficiently it will continue doing that year after year. Load Stability Changes Everything This is one factor many first-time buyers overlook. Some factories operate twenty-four hours a day with nearly constant cooling demand. Others experience frequent production changes throughout the shift. Scroll chillers generally perform very well when cooling loads change frequently. Starting and stopping individual compressors is relatively straightforward, making them suitable for production lines that don't always run at full capacity. Screw chillers usually show their advantages when operating under stable, continuous loads. Instead of repeatedly cycling on and off, they maintain consistent performance over long operating periods.   Hengde Unique Insight：Many buyers compare maximum cooling capacity, but experienced engineers often compare how stable the factory's cooling demand is throughout the day. That single factor often has a greater influence on compressor selection than peak capacity. Maintenance Looks Different People often assume larger equipment automatically requires more maintenance.In reality, maintenance depends more on operating conditions than physical size. Scroll chillers contain fewer mechanical components, making routine servicing relatively straightforward. For facilities without dedicated maintenance personnel, this simplicity is often appreciated. Screw chillers include additional systems such as oil management and capacity control. Although maintenance is more specialized, properly maintained screw compressors are designed for long operating hours and continuous industrial service.   Neither option is "maintenance-free." The maintenance simply takes different forms.  Energy Efficiency Depends on How You Use It Many comparison articles simply state that one compressor is more energy-efficient than the other.That isn't entirely accurate. A scroll chiller operating close to its design capacity may consume less electricity than an oversized screw chiller. Likewise, a screw chiller running continuously under heavy industrial loads often delivers better long-term efficiency than several smaller scroll compressors attempting to handle the same workload.   Hengde Unique Insight：There isn't a universally "more efficient" compressor. Efficiency depends on whether the compressor spends most of its time operating in the range it was designed for. Think About Future Expansion Production rarely stays exactly the same. A factory may introduce additional production lines, increase operating hours, or expand cooling demand over the next several years. When selecting an industrial chiller, it is worth considering future requirements rather than today's production volume alone. Some manufacturers intentionally leave moderate cooling capacity for expansion, while others install a central cooling system that allows additional chillers to be integrated later. Planning ahead can prevent expensive equipment replacement as production grows. Noise Isn't Just About the Compressor Customers occasionally ask whether screw chillers are noisier than scroll chillers. The answer is more complicated.   Noise is influenced by fan design, piping layout, installation quality, vibration isolation, compressor loading, and even the machine room itself. A well-installed screw chiller may operate more quietly than a poorly installed scroll chiller.   Hengde Unique Insight: When customers complain about chiller noise, the compressor is not always the main source. In many industrial projects, vibration transmission through foundations or piping contributes more noise than the compressor itself. Which One Is Right for Your Factory? Rather than asking which compressor is better, a better question is: "Which compressor best matches my production process?"   Generally speaking:  Scroll chillers are well suited for small and medium cooling capacities, flexible production schedules, and installations where simple maintenance is preferred. Screw chillers are often the better choice for continuous industrial production, central cooling systems, and applications requiring stable, high-capacity cooling.   Neither technology replaces the other. They simply solve different cooling challenges.   Hengde Unique Insight：Factories rarely regret buying a higher-quality chiller. More often, they regret purchasing equipment that was correctly sized on paper but poorly matched to their production process. How Hengde Can Help Hengde has specialized in manufacturing industrial chillers for more than 20 years, providing reliable cooling solutions for plastics processing, chemical reactors, pharmaceutical production, food manufacturing, laser equipment, and many other industrial applications.   Our product range includes both scroll chillers and screw chillers, available in air-cooled and water-cooled configurations. Instead of recommending the same model to every customer, our engineering team evaluates cooling capacity, operating temperature, production schedule, installation conditions, and future expansion plans before suggesting the most suitable solution.   Whether you're building a new production line or upgrading an existing cooling system, Hengde can help you select an industrial chiller that delivers stable performance, energy efficiency, and long-term reliability.   Choose Hengde，Choose Perfect Industrial Chiller！

Screw chillers are widely used in plastics processing, chemical production, food manufacturing, pharmaceutical facilities and other industrial applications. They are suitable for applications requiring relatively large cooling capacities and stable operation over long production cycles.   However, even a well-designed industrial screw chiller can develop problems after extended operation. High-pressure alarms, low-pressure faults, unstable water temperatures and compressor overheating are among the issues maintenance teams may encounter. Understanding the possible causes helps technicians identify the source of a problem instead of replacing components unnecessarily.   Quick Answer The most common screw chiller problems include high-pressure faults, low-pressure faults, insufficient cooling capacity, abnormal compressor temperatures, water-flow problems and electrical failures. Common causes include poor heat transfer, incorrect refrigerant conditions, restricted water circulation, electrical instability and inadequate maintenance. The recommended approach is to check the alarm history first, verify water flow and operating temperatures, inspect the condenser and evaporator, and then investigate the refrigeration and electrical systems. Refrigerant adjustments and compressor repairs should only be carried out by qualified technicians.   Key Takeaways High-pressure faults often involve condenser heat rejection. Low-pressure faults may result from refrigerant shortages, restricted flow or abnormal operating conditions. Reduced cooling capacity does not automatically mean the compressor is failing. Water quality and stable circulation have a direct effect on chiller performance. Recording operating data before a shutdown can make troubleshooting more efficient.   1. High-Pressure Fault: Check Heat Rejection First A high-pressure alarm occurs when the refrigerant condensing pressure exceeds the permitted operating range. For a water cooled screw chiller, possible causes include insufficient condenser-water flow, excessive cooling-water temperature, a malfunctioning cooling tower or scale buildup inside the condenser. For an air cooled screw chiller, dirty condenser coils, blocked airflow, failed fans or hot air recirculation can create similar problems.   How to fix it: Check condenser cleanliness, water flow or fan operation, depending on the chiller type. For water-cooled units, also inspect cooling-tower performance and condenser-water temperature. If these conditions are normal, a qualified technician should investigate refrigerant charge and other refrigeration-system conditions.   Hengde Insight：When a screw chiller develops a high-pressure alarm, do not start by assuming that the refrigerant charge is incorrect. Ask where the heat is supposed to go and whether the condenser can transfer that heat away effectively. This question can prevent unnecessary refrigerant adjustments.   2. Low-Pressure Fault: Look Beyond Refrigerant Charge Low-pressure protection may be triggered by insufficient refrigerant, a restricted filter-drier, an expansion valve problem, inadequate evaporator load or insufficient chilled-water flow. Very low water temperatures can also contribute to abnormal operating conditions if the system is not designed for them.   How to fix it: Check the chilled-water flow, inlet and outlet temperatures, evaporator condition and relevant refrigerant readings. Inspect for signs of refrigerant leakage before adding refrigerant. If a restriction or expansion valve fault is suspected, have a qualified refrigeration technician investigate it.   Adding refrigerant without identifying the underlying cause may temporarily change operating pressure without resolving the actual problem.   3. Insufficient Cooling Capacity Sometimes a screw chiller continues running but cannot maintain the required process-water temperature. This can happen when the actual heat load exceeds the design capacity, water flow is insufficient, heat exchangers are fouled or the compressor capacity-control system is not operating correctly.   Production changes can also increase cooling demand. A chiller that worked well when a production line was first installed may struggle after additional equipment is connected.   How to fix it: Compare the current cooling load with the original design conditions. Measure water flow and temperature difference, inspect the heat exchangers and verify compressor loading. If production demand has increased significantly, the cooling system may require hydraulic modifications or additional capacity.   Hengde Insight：Before recommending a larger chiller, confirm whether the existing capacity is being used effectively. Poor flow distribution, fouled heat exchangers or incorrect control settings can make a correctly sized machine appear undersized.   4. Compressor Overheating or Frequent Trips Compressor overheating and repeated overload trips should never be ignored. Potential causes include excessive operating pressure, inadequate lubrication, abnormal refrigerant conditions, high discharge temperature, voltage imbalance or mechanical wear.   How to fix it: Record the alarm code, compressor current, operating pressures and temperature readings. Check the power supply and relevant protection devices. Lubricating oil condition, oil level and oil-system operation should be inspected according to the compressor manufacturer's instructions.   Do not repeatedly reset the compressor and return the machine to service without identifying the reason for the trip. Persistent overheating or abnormal mechanical noise requires professional inspection.   5. Water-Flow Problems and Heat Exchanger Fouling Insufficient water flow can reduce heat-transfer performance and trigger protective shutdowns. Common causes include clogged filters, partially closed valves, air trapped in the piping, pump problems or deposits inside the heat exchanger.   How to fix it: Check pump operation, water pressure, valves, filters and flow-switch status. Inspect water quality and arrange appropriate cleaning when scale or deposits are found. The cleaning method must be compatible with the heat exchanger materials and the manufacturer's recommendations.   Maintenance intervals should be based on water quality, operating hours and inspection results rather than following a fixed schedule regardless of actual conditions.   A Practical Troubleshooting Sequence When a screw chiller stops unexpectedly, technicians can follow this sequence: Record the alarm code and operating conditions before resetting the unit. Verify incoming power, phase balance and electrical protection status. Check chilled-water flow, pump operation and water temperatures. Inspect condenser conditions and heat rejection. Review refrigerant pressures and compressor operating data. Inspect lubrication, capacity control and relevant protection devices. Run the machine under normal conditions and confirm that the fault does not recur. Electrical and refrigeration-system work should be performed by qualified personnel. Isolate power before electrical inspection, and never bypass safety protection to keep a machine running.   Hengde Screw Chiller Products and Company Information Nanjing Hengde Electrical Equipment Co., Ltd. has manufactured industrial temperature-control equipment since 2010. Its product range includes air-cooled chillers, water-cooled chillers, screw chillers, scroll chillers, low-temperature chillers and mold temperature controllers.   For example, Hengde's HC-600WD water-cooled screw chiller has a nominal cooling capacity of 600 kW (200 HP), with two semi-hermetic screw compressors. This model illustrates the type of large-capacity cooling equipment used in demanding industrial applications. Actual performance depends on the specified operating conditions.   Hengde operates a 15,000 m² facility with more than 150 employees and provides customized cooling solutions based on cooling capacity, water temperature, ambient conditions, flow requirements, voltage and application needs. When selecting or troubleshooting a screw chiller, matching the system configuration to the actual process requirements is essential for reliable long-term operation.   FAQ Why does my screw chiller keep showing a high-pressure alarm? Common causes include poor condenser heat transfer, high cooling-water temperature, insufficient water flow or restricted airflow. Check the heat-rejection system before investigating refrigerant charge. How often should a screw chiller be maintained? Maintenance frequency depends on operating hours, water quality, environmental conditions and the manufacturer's recommendations. Regularly inspect filters, heat exchangers, electrical connections, operating pressures and compressor data. When should a screw chiller compressor be replaced? A compressor should not be replaced based on a single alarm. Confirm the fault through operating data, electrical tests, lubrication checks and professional mechanical diagnosis before deciding on replacement.   Conclusion Most screw chiller problems become easier to diagnose when technicians follow a systematic process rather than immediately replacing components. Start with the alarm history, verify water circulation and heat rejection, and then investigate refrigeration, lubrication and electrical conditions. Consistent maintenance and accurate operating records can help reduce unexpected shutdowns, protect the compressor and extend the service life of an industrial screw chiller.