Hitachi Chiller Systems in Industrial Environments: Stable Cooling Solutions for Heavy and Continuous Loads

In industrial environments, particularly in large industrial zones in Ho Chi Minh City, Binh Duong, Dong Nai, Long An..., factories producing food, textiles, electronic components, plastics, chemicals, food processing, data centers... often need to effectively address two key issues: large and continuous heat loads (cooling machinery, production processes, capacities from several hundred to thousands of RT, operating 24/7) and absolutely stable cooling where chilled water temperature must be maintained precisely (typically 7°C outgoing / 12°C returning), with no fluctuations or interruptions to avoid product damage or production line stoppages.

The Hitachi Chiller system is considered a comprehensive solution to meet these two core factors: stable cooling for large loads and continuous operation. With a diverse portfolio (scroll, screw, centrifugal, magnetic bearing, absorption), Up. Tech, the exclusive distributor of Hitachi air conditioners in Vietnam, provides a wide range of models suitable from medium to super-large loads, with a particular focus on reliability, part-load efficiency, and durable continuous operation.

Note: Outgoing: The temperature of water or air when leaving a system or equipment (e.g., air conditioner or heat pump), typically 7°C. Returning: The temperature of water or air when returning to that system or equipment, typically 12°C.

Why the Hitachi Chiller system ensures stable cooling for large and continuous loads

All Hitachi chiller lines use the company's proprietary compressors, including scroll, screw, centrifugal, magnetic bearing, and absorption types. Combined with DC inverter or VSD (variable speed drive) technology, the system smoothly and almost continuously adjusts capacity from the lowest level to 100%. This keeps the chilled water temperature stable and precise even when heat loads vary significantly across production shifts: for example, high-demand daytime shifts and low-demand nighttime shifts.

Designed specifically for 24/7 continuous operation, components are manufactured with high durability, combined with multi-layer protection systems (overload, high/low pressure, oil shortage, anti-corrosion), enabling Hitachi chillers to operate reliably in harsh industrial environments, ensuring stable cooling without interruption risks.

Flexible modular design for expansion: Scroll and screw types support connecting multiple modules (up to 16 modules), making it easy to scale capacity as factories expand production. Large centrifugal units can be paralleled or expanded with additional units without shutting down the entire system. This allows factories to adjust capacity to actual needs, minimizing risks during upgrades.

High efficiency at low-load (part-load) conditions in inverter and magnetic bearing lines achieves very high levels, significantly saving electricity during low-load periods (night shifts, weekends, or low production times). At the same time, the system maintains stable chilled water temperature without needing to run at full load continuously. Some scroll (AVMY/AVSY) and certain screw lines use direct air cooling, completely eliminating the need for cooling towers, large water pumps, and complex piping. This significantly reduces downtime risks from cooling water issues (leaks, blockages, maintenance), while saving long-term installation and operating costs.

Overall, these features make the Hitachi Chiller system an ideal solution for Vietnam's industrial environments: ensuring stable cooling despite large loads, while enabling 24/7 continuous operation with electricity savings and easy maintenance.

Hitachi Chiller lines most suitable for industry (large & continuous loads)

1. Scroll Air-cooled Inverter (AVMY & AVSY series) – Medium to large loads (100 – 2,000 kW)

Scroll compressor type, air-cooled, DC inverter, modular – suitable for medium to large loads requiring stable cooling without complexity.

• AVMY: Modular 65/130 kW/module (18/36 RT), connect up to 16 units for a total of up to 2,080 kW (approx. 590 RT). Proprietary DC Inverter Scroll compressor, stepless capacity control 25–100%, maintains chilled water temperature stable (±0.5°C), no fluctuations despite load changes across shifts. Stable COP, suitable for 24/7 continuous operation with multi-layer protection (overload, pressure).
• AVSY: Improved from AVMY, footprint reduced by 28% (smaller area when connecting multiple modules), IPLV up to 6.06, COP 3.0, ultra-quiet mode (low noise). New technologies: U-shape heat exchanger, brazed plate evaporator, high-precision EEV, intelligent VFD, saving up to 30% electricity at part-load (low loads common in industry).
• Applications: Process cooling (injection molding, extrusion, CNC), glycol chilling for breweries/beverages, continuous machinery cooling in medium to large factories. Ideal for industrial zones without cooling water sources, needing quick expansion (modular L/U/T/Z configurations).

2. Screw Water-cooled/Air-cooled (WZPY high eff fixed, WZY fixed, WVY inverter, AZ(P)Y1 Series)

Large stable loads (350–1,800 kW+) Semi-hermetic screw compressor type, suitable for large continuous loads, with water-cooled (requires cooling tower) or air-cooled (more flexible) versions.

• WVY inverter: Water-cooled, 155 - 520 RT (545-1,830 kW), highest IPLV (up to 9.93), EER 5.9, saving 20–30% compared to fixed speed. Inverter screw compressor, smart capacity control (20–100% modulating) for extremely stable cooling, minimal water temperature fluctuations during load variations (high/low demand shifts).
• WZPY high eff fixed: Water-cooled, flooded evaporator, cyclone oil separator, high COP, compact footprint optimized for large continuous loads, reduced pressure losses.
• WZY fixed: Water-cooled, stable performance, supports heat pump/total heat reclaim, suitable for high stable loads.
• AZ(P)Y1 air-fixed: Air-cooled, no tower needed, medium capacity (60-450 RT), easy rooftop installation.
• Applications: Large factories needing high continuous loads (textiles, chemicals, food processing). Water-cooled for ultra-stable loads, air-cooled for water-scarce areas.

3. Centrifugal Water-cooled Gear-driven/Direct drive (K-S series, GFG/GXG gear, GFVG/GXVG VSD, K-VG PM)

Super-large loads (300 - 2,500 RT) Centrifugal compressor type, water-cooled, for extremely large loads requiring stable and continuous cooling on a massive scale.

• K-S series gear-driven: Cooling capacity 300–2500 RT (1,055–8,790 kW), single-compressor unit up to 2,500 RT. High full-load stability, heat recovery/heat pump/inverter/soft starter functions for continuous cooling of large loads, reduced fluctuations thanks to precise gear design.
• GFG/GXG gear-driven: Stable for large loads with gear transmission.
• GFVG/GXVG direct drive VSD: More efficient, quieter operation, better IPLV at part-load.
• K-VG direct drive PM (permanent magnet): 300 - 1,100 RT, higher energy savings, smooth and quiet operation, stable chilled water temperature thanks to synchronous motor.
• Applications: Super-large projects (data centers, heavy industry factories, airports, industrial-commercial complexes). Ideal for high continuous loads where massive capacity and stability (no temperature fluctuations) are required.

4. Magnetic Bearing Centrifugal Water-cooled (VM series)

High-end large loads (300 - 1,500 RT) Magnetic bearing centrifugal compressor type, water-cooled, oil-free – the most advanced generation for large continuous loads with peak efficiency.

• VM series: Oil-free, IPLV >10, COP >6.0, ultra-quiet (76 dB(A)), no friction. Direct drive, VSD smooth capacity control, extremely precise chilled water temperature stability, 24/7 continuous operation with minimal maintenance (no oil changes).
• Applications: High-end industrial-combined buildings, large hospitals, where maximum electricity savings, quietness, and stable large loads (low vibration, minimal fluctuations) are needed.

5. Absorption (Steam/Direct-fired)

Large loads with waste heat (100 - 3,000 RT) Absorption chiller using waste heat/steam/gas instead of electricity, suitable for large continuous loads with available heat sources.

• Steam Absorption: Uses hot steam for cooling, stable for large loads if steam source is continuous.
• Direct-fired: Uses gas/direct fuel for major electricity savings (COP 0.7 - 1.2 but low-cost heat).
• Applications: Factories with excess waste heat (paper mills, power plants, food processing) for continuous cooling without compressor electricity consumption, reducing long-term operating costs.

Real benefits of applying Hitachi Chiller systems in industry

The Hitachi Chiller system is not just a chiller but a solution ensuring stable cooling for large and continuous loads, helping Vietnamese factories maintain uninterrupted production and optimize costs. Hitachi chillers always use environmentally friendly refrigerants.

Industrial units – heavy industry systems, chemicals... needing solutions for factories in Ho Chi Minh City or industrial zones, please contact Up. Tech, the exclusive distributor of Hitachi air conditioners in Vietnam, for references, consultations, and accurate quotations. Choosing the right chiller from the start ensures stable production and long-term savings!

U.P. TECHNOLOGY AND TRADING CO., LTD.

Hotline: 1800 6202

Email: vu@uptech.com.vn

Website: https://uptech.com.vn

Transaction Office: 370 Cach Mang Thang 8 Street, Nhieu Loc Ward, Ho Chi Minh City

Head Office: A13, Thuan Viet Commercial Area, 319 Ly Thuong Kiet Street, Phu Tho Ward, Ho Chi Minh City.