Hitachi Absorption Chiller System – The Pinnacle of Evaporative Cooling Technology for Large Factories

With rising electricity costs and increasingly stringent carbon emission regulations, optimizing surplus energy in industry is a critical challenge for businesses. With over 50 years of leadership in the cooling industry, Hitachi Absorption Chiller systems have established themselves as the optimal solution for large-scale projects where thermal energy can be directly converted into efficient cooling energy.

The Position of Hitachi Air Conditioners and the Trend of Using Absorption Chiller Systems

Hitachi is a pioneer in the research and development of industrial air conditioning technology. The Hitachi Absorption Chiller series is designed to replace traditional electric compressors using a chemical absorption cycle between water (refrigerant) and Lithium Bromide (absorber).

The current trend in thermal power plants, textile factories, and chemical plants is to utilize surplus heat sources such as steam, exhaust gases, or hot water from production processes to run Hitachi Chiller systems. This not only reduces pressure on the power grid but also helps businesses directly cut operating costs, while contributing to sustainable development goals.

Classification of Hitachi Absorption Chiller Systems

Hitachi chillers offer two main product lines suitable for different heating conditions for each project:

EXH/EXS (Direct-fired) Series: Direct-fired

Uses gas or oil as the primary energy source to activate the absorption cycle. With high safety thanks to the integrated intelligent burner management system, ensuring absolute safety during combustion. Capable of providing both chilled water for cooling and hot water for heating or other technological processes. Suitable for buildings or factories that do not have a readily available source of excess steam but want to reduce their dependence on electricity.

EX/EXS (Steam) Series: Steam-Based

This is the core product line offering the most significant economic benefits thanks to its ability to reuse thermal energy. Based on the principle of utilizing waste heat, the system uses low-pressure steam (usually from the production process or existing boilers) as the primary heat source. Instead of releasing the waste heat into the environment, businesses feed this steam into Hitachi air chillers to produce chilled water (7°C or lower), which is then used in air conditioning systems or to cool production lines for optimal process efficiency. This maximizes the heat lifecycle, transforming energy waste into practical value.

The Breakthrough Technology Advantages of Hitachi Chiller Systems

The difference between Hitachi Chiller systems and competitors lies in proprietary designs aimed at increasing efficiency and extending equipment lifespan.

Parallel Flow Structure

Unlike conventional series flow cycles, Hitachi's Parallel Flow structure simultaneously divides the dilute LiBr solution into high-pressure and low-pressure steam generators. This design keeps the solution concentration within a safe range, preventing crystallization that can clog the system. It reduces operating pressure and thermal stress on heat exchangers, extending component lifespan.

Two-Step Evaporator & Absorber Design

This is a core technology that optimizes heat exchange efficiency. This structure divides the evaporation and absorption process into two stages, increasing the absorption capacity of the LiBr solution and stably reducing the chilled water temperature. By optimizing flow, the system minimizes vortices that can cause mechanical wear on copper tubing.

Fast start-up capability and compact design

Hitachi's new steam generator is optimally designed to reduce the amount of refrigerant added to the system, allowing it to reach rated capacity faster than older chiller models. Its compact design significantly reduces installation space in the plant room.

Energy Efficiency and Control Systems

Hitachi absorption chillers achieve a COP (Coefficient of Performance) of up to 1.41 for the Double Effect series. This means that with the same amount of input heat energy, the system generates significantly more cooling, reducing CO2 emissions and saving fuel costs.

The intelligent management system with a 10.4-inch touchscreen and intuitive interface displays the entire machine cycle, allowing real-time monitoring of pressure, temperature, and solution concentration parameters. The automatic purge system ensures absolute vacuum inside the machine, a crucial factor for absorption chillers, enabling reliable operation for over 8,000 hours/year.

Life Cycle Cost Analysis (LCC) for Investors

For MEP contractors and investors, choosing a Hitachi chiller system is not just about the initial purchase price but also about the life cycle cost.

With an exceptional lifespan of up to 15 years or more if properly maintained, and with standard periodic maintenance from a professional MEP contractor like Up.Tech, the system can operate stably. Maintenance costs are low due to the absence of high-speed moving parts (such as screw or centrifugal compressors), and periodic component replacement costs are significantly lower than electric chillers. If waste heat is utilized, operating costs are almost zero. This is a key factor in achieving bonus points in green certifications such as LEED or LOTUS.

Hitachi absorption chiller systems are not simply air conditioning equipment; they are part of a smart energy management solution. The ability to utilize waste heat, combined with Parallel Flow anti-crystallization technology and superior COP (Coefficient of Performance), makes Hitachi a reliable partner for large industrial parks and factories in Vietnam. Choosing the right consulting and implementation partner like Up.Tech will help businesses optimize steam duct design schemes, ensuring the system operates according to manufacturer specifications, and delivering sustainable economic benefits for investors.

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.