Water Chiller Chillers play a crucial role in modern industrial cooling and central HVAC systems. With the ability to generate a stable supply of chilled water for cooling production machinery or air conditioning buildings, choosing a high-performance chiller system is vital for optimizing operating costs for businesses. Tan Long, with more than 20 years of field experience in refrigeration engineering, Tan Long supplies not just equipment but a complete turnkey installation solution built to standard. The sections below set out the construction, operating principle and applications in detail. water chiller We help our clients make the most accurate investment decisions.
What is a water chiller?
Water Chiller also known as an industrial water chiller, is purpose-built equipment for bringing a liquid — water or a heat transfer fluid such as glycol — down to a set temperature. It is the core solution for cooling machinery, keeping production lines running stably, and serving large-scale HVAC systems in plants and high-rise buildings.
Unlike ordinary cooling methods, a water chiller system works on a closed thermodynamic vapour compression cycle. The process separates the cooling side that serves the load from the heat rejected to the environment through a condenser or a chiller cooling tower. Chilled water leaving the unit is typically held at a steady 7°C to 12°C, meeting the demanding temperature control requirements of modern industrial production.
Tan Long provides a complete chiller solution — from capacity selection and system design through installation to scheduled maintenance — for manufacturers, food and pharmaceutical processors and HVAC operators nationwide.
Construction of a water chiller system
A system water chiller consists of the main machine package plus matched auxiliary equipment. Understanding what each part does helps a business run the system stably, maintain it correctly and extend equipment life.
The main machine package comprises these four core components:
- Refrigeration compressor: This is the control centre of the entire thermal cycle of the water chiller. It directly determines cooling capacity, electricity consumption and operating stability. Today the refrigeration compressor screw compressor or the scroll compressor is Tan Long's preferred choice for industrial projects. For very large facilities from 300 refrigeration tons (RT) upwards, the centrifugal compressor is the optimum choice.
- Evaporator: This is where the water is actually chilled. The evaporator is the thermal contact point between the refrigerant and the circulating water. It is usually built with copper tube to maximise heat exchange efficiency and improve resistance to chemical corrosion.
- Condenser: This part rejects surplus heat from the refrigerant to the outside. On a water chiller water-cooled unit, that heat is released through a chiller cooling tower. On an air-cooled chiller, high-capacity fans blow air directly across the condenser to cool it.
- Expansion valve: This regulates the flow of refrigerant into the evaporator precisely. A new-generation electronic expansion valve controls temperature to within ±0.1°C, helping the system optimise performance against the plant's actual load.
Beyond the main package, the essential auxiliary equipment includes the chilled water pumps, the cooling tower and dedicated insulated pipework. In particular, for the whole system to run automatically and safely, fitting a PLC control cabinet with BACnet or Modbus communication is the specialist solution that lets a business monitor everything through its building management system (BMS).
How a water chiller works
System water chiller runs on a closed thermodynamic vapour compression cycle. The core aim is to move heat from the water into the refrigerant, then reject that heat to the environment, bringing the water down to the required temperature.
The whole refrigeration cycle runs through four continuously repeating stages:
| Stage | Equipment involved | Energy transformation |
| 1. Evaporation | Evaporator | Liquid refrigerant absorbs heat from the water, boils and turns to vapour. Water temperature falls from 12°C to 7°C for use in production. |
| 2. Compression | Refrigeration compressor | The compressor raises the refrigerant vapour to very high pressure and temperature, ready for heat rejection at the condenser. |
| 3. Condensation | Condenser | The hot refrigerant rejects heat to the air or through the chiller cooling tower and condenses back to liquid. |
| 4. Expansion | Expansion Valve | Refrigerant pressure drops sharply, taking the temperature down with it. The refrigerant is ready to return to the evaporator and begin a new cycle. |
The operation of a water chiller depends on close coordination between two parallel circuits: the refrigerant circuit and the condenser water circuit. The two run independently but exchange heat closely at the intermediate equipment. This is the engineering basis on which a chiller holds steady efficiency and keeps its energy saving over the long term, which suits Vietnam's hot, humid climate particularly well.
In Tan Long, every water chiller system is fitted by Tan Long with a modern PLC control panel. This technology monitors each stage of the cycle accurately, keeping operation safe and optimising running cost for the business.
Common types of water chiller
Choosing the right water chiller does more than optimise heat rejection — it saves a business substantial running cost. Below are the most common ways of classifying chiller systems by industrial engineering standard.
Water chillers classified by heat rejection method
This is the most important criterion when selecting a system; it directly affects installation conditions and the plant's long-term cooling performance.
| Comparison criteria | Air-cooled chiller | Water-cooled chiller |
| Mechanism of action | Uses fans blowing air directly across the condenser | Uses water from a chiller cooling tower for cooling |
| Cooling efficiency | Medium | 15% to 25% higher than the air-cooled type |
| Space requirement | Installed outdoors, no cooling tower needed | Needs space for a cooling tower and a dedicated plant room |
| Investment costs | Lower, and quick to install | Higher, because pumps and a cooling tower are required |
| Best suited to | Small and medium facilities, or sites with limited water supply | Large plants, industrial parks and commercial buildings |
| Capacity range | Usually under 500 RT | From 50 RT to several thousand RT |
Water chillers classified by compressor technology
The compressor is the heart of the system. Depending on the cooling load, Tan Long supplies the following refrigeration compressor types integrated into the chiller package:
- Scroll compressor chillers: This is the small to medium capacity range (under 50 HP). It runs extremely quietly with little vibration, which suits laboratories, hospitals and medium-sized production workshops.
- Screw compressor chillers: Capacity range from 30 HP to 500 HP. With high stability and the ability to run continuously, this is the specialist first choice for cold storage and industrial production lines in Vietnam.
- Centrifugal compressor chillers: For systems of 200 RT and above. This technology delivers the energy efficiency needed by airport complexes, shopping centres and large export processing zones.
- Piston compressor chillers: Usually small in capacity and low in cost. However, this type is now little used on modern projects because of high noise and limited cooling performance.
Water chillers classified by cooling capacity
Depending on project scale, water chiller is divided into the following practical capacity bands:
| Band | Capacity (TR / HP) | Typical application |
| Small | Under 5 TR (under 6 HP) | Cooling servers, medical equipment and laboratories |
| Fit | 5 to 50 TR | Production workshops and food processing plants |
| Big | 50 to 500 RT | Heavy industrial plants and high-rise buildings |
| Very large | Over 500 RT | Industrial park infrastructure and international airports |
(1 RT ≈ 3,5 kW ≈ 12.000 BTU/h)
To keep the system running smoothly, Tan Long always recommends adding a modern PLC control panel. This controls compressor capacity accurately against the real load, optimising the electricity consumption of the whole system water chiller.
Industrial applications of water chillers
System water chiller is deployed widely in sectors that need stable temperature control and continuous 24/7 operation. Below are the key industries for which Tan Long supplies turnkey installation solutions:
- Central air conditioning (HVAC) systems: System water chiller produces chilled water at 7°C to 12°C to feed heat exchange coils such as FCU and AHU. This is the most common application in office buildings, shopping centres and hotels, optimising the HVAC for large spaces.
- Plastics and rubber manufacturing: The unit cools injection moulds, bottle blowing machines and plastic extrusion lines. Holding mould temperature steady gives even product forming, cuts the reject rate and raises line output markedly.
- Food and beverage processing: Water chillers play an important role in rapid product cooling after pasteurisation and in controlling fermentation temperature for beer and spirits. For applications needing sub-zero temperatures, Tan Long normally recommends a Glycol solution to keep cooling performance at its best.
- Pharmaceuticals and chemicals: Used to control low-temperature chemical synthesis reactions and to preserve biological samples. In this industry temperature accuracy is a non-negotiable requirement for product quality.
- Data centre infrastructure: To keep servers running stably, the water chiller supplies chilled water continuously to precision air conditioning (CRAC/CRAH). This keeps the machine room below 25°C, preventing overheating incidents in digital infrastructure.
- Precision engineering and metalworking: Used to cool cutting oil, CNC machine spindles and industrial welding equipment. Stable temperature extends tool life and improves the accuracy of every machined part.
- Heavy industrial cooling: Applied in metallurgy, ready-mix concrete production and large-scale distillation processes. A chiller system brings temperature down across a wide range, from 60°C to 30°C, quickly and safely.
Alongside supplying genuine equipment, Tan Long also integrates industrial refrigeration and automated management systems so that a business can run its water chiller at peak efficiency.
Advantages of a water chiller system
Investing in a water chiller brings a business several strategic benefits, thanks to durable operation and optimised heat rejection. These are the specific advantages of Tan Long's solution:
- Energy efficiency: Lines water chiller of the new generation integrate advanced inverter technology, letting the refrigeration compressor adjust its speed automatically to the real load. Compared with older fixed-speed chillers, this saves a business 20% to 40% of electricity consumption, optimising monthly running cost.
- Precise temperature control: A modern electronic control system holds chilled water temperature to within ±0.5°C. That accuracy is critical in plastics and pharmaceutical production, and when the chiller is combined with a cold storage system to preserve temperature-sensitive products.
- Quiet, stable operation: Because water is an ideal heat transfer medium, flow is stable and no appreciable noise arises during heat exchange. That makes the water chiller suitable even where quiet is required, such as hospitals, schools and specialist laboratories.
- Long equipment life: A system installed to correct engineering practice and maintained on schedule reaches an average life of 15 to 25 years. High-quality centrifugal compressors supplied by Tan Long in particular run reliably beyond the 25-year mark, protecting the owner's long-term investment.
- Flexible capacity expansion: The chiller system design allows several packages to be connected in parallel. That lets a business upgrade cooling capacity in stages as production grows, without dismantling or replacing the existing infrastructure.
- Integration with smart management systems: Water chillers of modern design connect easily to a building management system (BMS) through protocols such as BACnet or Modbus. Through the PLC control panel, technicians can monitor remotely, schedule automatic operation and receive early fault alarms for prompt action.
Specifications to establish when selecting a chiller
Choosing the right chiller calls for accurate calculation from each facility's real requirements. Tan Long advises businesses to establish the following parameters before a solution is proposed:
| Parameter | Unit | Meaning |
|---|---|---|
| Cooling capacity | RT / kW / BTU | Determined from the facility's actual heat load |
| Chilled water outlet temperature | °C / °F | Usually 7°C (45°F), lower with glycol |
| Chilled water inlet temperature | °C / °F | Usually 12°C (54°F) |
| Chilled water flow rate | m³/h | Proportional to capacity and to the temperature difference ΔT |
| Energy efficiency (COP/EER/IPLV) | kW/RT | The lower the value (kW/RT), the more electricity is saved |
| Refrigerant type | R134a / R410A / R1234ze | Affects efficiency and environmental impact |
| Operating voltage | V / Hz | 380V/50Hz (standard in Vietnam) |
| Heat rejection type | Air / water | Determines site requirements and capital cost |
Water chiller maintenance guide
Scheduled maintenance decides the life and performance of a chiller system. Tan Long recommends the following maintenance cycle:
- Monthly checks: Monitor compressor suction and discharge pressures, the water temperatures in and out of the evaporator, the lubricant level and the condition of the water filters. Catching abnormal signs early allows them to be dealt with before a failure occurs.
- Quarterly maintenance (every 3 months): Clean the heat exchangers with dedicated equipment, check and clean the cooling fans, and verify the instrumentation and control panel. This is the most important maintenance interval for keeping cooling performance steady.
- Annual maintenance: Inspect the compressor thoroughly — oil condition, suction and discharge valves, internal components. Deal with scale in the condenser and evaporator. Check the concentration and pH of the cooling tower water. Recalibrate the control parameters.
Signs the system needs urgent maintenance: a clear drop in cooling performance, abnormally high condenser temperature, unstable water flow, or the compressor drawing more power than its design figure.
Chilled water for food processing lines
Water close to freezing point (0°C to 5°C) carries heat very effectively: compared with other cooling media, a relatively small volume of water removes a large amount of heat. That is why many processing plants choose chilled water rather than direct cooling for preparation stages.
| Industry | Chilled water application |
|---|---|
| Food and beverage | Washing and processing meat, fish, seafood and poultry · stabilising line temperature for dairy, soft drinks and beer · keeping vegetables and fruit fresh after harvest · rapid cooling before pre-freezing · supplying water to glazing machines ở 0,5 – 2°C |
| Pharmaceuticals and chemicals | Supplying chilled water for chemical reactions and solution mixing · holding stable temperature conditions in drug manufacture · cooling equipment and special storage areas |
| Other industries | Concrete mixing, cooling moulds and production equipment |
The heat exchanger used for this group of applications is usually a plate or falling-film type. When the temperature has to go below 0°C without freezing the pipework, the answer is to use a glycol chilled water solution instead of plain water.
Compared with other cooling equipment
A chiller uses water as the heat transfer fluid, so it can only run above freezing point. When the requirement is different:
- Glycol water chiller — add glycol to go below 0°C without freezing the pipework.
- Refrigeration compressor — the compressor type chosen determines the efficiency and electricity cost of the whole chiller package.
- Evaporative condenser — the heat rejection option for large-capacity systems, in place of a conventional cooling tower.
See the full range of industrial refrigeration equipment built by Tan Long.
Frequently asked questions about water chillers
What is the average life of a chiller system?
A chiller system installed to correct engineering practice and maintained on schedule reaches an average life of 15 to 25 years. In practice many screw and centrifugal chillers in Vietnam run reliably beyond 25 years.
How often does a chiller system need maintenance?
Basic checks monthly, technical maintenance every 3 months and a full overhaul annually. The actual frequency depends on how hard the system works and on the installation environment. See scheduled maintenance package offered by Tan Long.
Does an inverter chiller really save electricity?
Yes. Under real operating conditions, where the cooling load changes through the day, an inverter chiller saves 20% to 40% of electricity compared with a fixed-speed chiller of the same capacity. Payback on the extra investment is typically 2 to 4 years depending on usage intensity.
Which refrigerant should a new chiller use?
New-generation refrigerants such as R134a, R410A and R1234ze are replacing R22 in new chiller systems, following the HFC phase-down under the Montreal Protocol. Tan Long advises on refrigerant choice according to the required operating temperature and current environmental regulations.
How cold can a chiller take the water?
With plain water the practical limit is 0°C to 5°C, because below that it freezes in the heat exchanger and the pipework. For sub-zero temperatures you have to switch to a glycol solution, with the mix ratio calculated from the required temperature.
What do seafood processing plants use chillers for?
Supplying chilled water for washing and preparation, stabilising line temperature, rapid cooling before freezing, and supplying water at 0.5 to 2°C to glazing machines. It is auxiliary equipment, but it directly affects the quality of the incoming raw material.
Request advice and a quotation
Tan Long designs and builds industrial refrigeration equipment at its plant in Duc Hoa 1 Industrial Park, Tay Ninh (formerly Long An), so capacity and dimensions can be adjusted to the actual site. Call 0933 357 058 (Mr. Thinh) or send a quotation request with your output per shift and your main product type.
How Tan Long advises on and supplies water chillers
Tan Long controls both design and manufacture at its plant in Duc Hoa 1 Industrial Park, Tay Ninh (formerly Long An), so the investor deals with a single point of contact from survey to handover:
- Survey and requirement definition: engineers work directly at the plant to establish capacity, layout, refrigerant and real operating conditions.
- Technical proposal: calculating a suitable configuration and discussing it with the investor's technical team before it is fixed.
- Detailed design: drawings are prepared and materials and equipment selected to match the refrigerant and the operating temperature range.
- Manufacture and works testing: machining, assembly and a test run before the unit leaves the factory.
- Installation and acceptance: connection into the plant's system, load testing and handover with the technical documentation.
- Warranty and operating support: operating instructions for the plant's technical team and fault support during the warranty period.
Why choose Tan Long for water chillers?
Tan Long is a refrigeration engineering joint stock company with more than 20 years in industrial refrigeration, serving seafood and food processing plants and large-scale cold stores across Vietnam.
- In-house manufacturing: its own factory in Duc Hoa 1 Industrial Park, Tay Ninh (formerly Long An), with no dependence on outside subcontractors.
- Turnkey D&B capability: design and construction under one roof, reducing the risk of a gap between the drawings and what is actually installed.
- Complete documentation: equipment is handed over with technical files and CO/CQ certificates of origin.
- Engineers with field experience: advice based on each plant's actual system configuration rather than selling from a catalogue.
- Support after handover: the technical team is on hand for operation and maintenance throughout the equipment's life.
For advice on a specific configuration, please contact Tan Long's engineering team or see the projects already delivered.
