The Dunham Bush DMAR-S Series is an elite line of high-capacity industrial Steam-Driven Absorption Chillers engineered to convert pressurized steam into heavy-duty central cooling. Delivering massive capacities from 150 to 3307 RT ($528\text{ to }11631\text{ kW}$), the DMAR-S eliminates the need for power-hungry mechanical compressor motors entirely. Instead, it utilizes an advanced Lithium Bromide ($LiBr$) and water chemical absorption loop driven directly by waste or process steam from industrial boilers, co-generation plants, or steam turbines. It is the definitive energy-saving central HVAC solution for steam-intensive textile dye houses, spinning mills, pharmaceutical production blocks, and heavy processing plants across Bangladesh.
Cooling Capacity from 150 – 3307RT (528 – 11631kW)
The DMAR-S features:
The Dunham Bush DMAR-S Series Steam Absorption Chiller is a game-changer for heavy industrial zones like Narayanganj, Gazipur, and Chittagong, where manufacturing plants generate massive amounts of steam daily. Traditional central air conditioning systems rely on electric centrifugal or screw chillers that draw massive currents from the power grid, resulting in high electricity bills. The DMAR-S bypasses this entirely by substituting mechanical compression with a highly advanced, thermally driven chemical absorption cycle powered directly by steam.
Operating under a deep internal vacuum, water acts as the environmentally safe green refrigerant, boiling at an ultra-low temperature ($4.5^\circ\text{C}$) to absorb heat from your facility's chilled water loop. The concentrated Lithium Bromide ($LiBr$) salt solution acts as a powerful chemical sponge to absorb this evaporated water vapor. Pressurized process steam or waste steam is then injected directly into the chiller's generator tubes, heating the solution to separate the water from the salt so the cycle can run continuously. Since the entire machine requires electricity only for small solution circulation pumps, its total electrical footprint is near zero compared to traditional electric chillers.
To maintain maximum thermodynamic efficiency and long-term durability, the DMAR-S is equipped with an advanced gravity drip distribution technology. Rather than spraying the solution forcefully (which can foul internal tubes), the $LiBr$ solution drips smoothly over the heat exchanger surfaces under gravity, forming a consistent liquid film that maximizes heat transfer. Combined with a fully automatic air purging system that constantly clears non-condensable gases from the vacuum shell, internal oxidation is completely prevented—ensuring non-stop operational uptime.
| Feature / Attribute | Technical Specification Details |
| Cooling Capacity Range | 150 to 3307 RT ($528\text{ to }11631\text{ kW}$) |
| Primary Energy Input | Pressurized Steam (Sourced from Industrial Boilers or Turbines) |
| Chemical Working Fluids | Lithium Bromide ($LiBr$) Absorbent and Water ($H_2O$) Refrigerant |
| Liquid Distribution | Advanced Gravity Drip Technology (Maximizes film heat transfer) |
| Crystallization Safeguard | Multi-level automated dilution valves and VFD pump logic |
| Vacuum Maintenance | Fully automatic high-capacity vacuum air-purging system |
| Environmental Profile | 100% ODP and GWP Free — Zero synthetic chemical refrigerants used |
Steam-to-Cooling Thermal Exchange: Transforms high-temperature boiler steam directly into massive flows of chilled water for central factory or building air conditioning.
Double-Effect Vapor Recapture: Utilizes a high and low-temperature generator staging setup to capture internal energy from the first chemical separation phase, significantly increasing cooling output per pound of steam.
Variable Solution Flow (VFD Control): Employs variable-frequency drives on the internal solution pumps to adjust chemical circulation rates instantly based on real-time building loads, maximizing part-load efficiency.
Proactive Crystallization Protection: Continuously monitors solution concentrations and temperatures. If a sudden steam drop occurs, the system automatically dilutes the solution to keep the fluid chemistry flowing safely.
State infrastructure—including central deep-sea port offices, national fertilizer processing zones, government-run sugar mills, and public sector co-generation power plants—frequently operates large-scale steam boiler infrastructures.
Reduces Strain on the National Grid: Shifting megawatt-scale central cooling loads away from electric motors protects the local power grid from high-ambient summer overloads.
Optimizes Total Plant Fuel Use: Capturing surplus steam from public power generation loops to provide comfort cooling for administrative offices dramatically boosts the facility's overall thermal efficiency.
For Bangladesh's massive export-oriented Ready-Made Garment (RMG) factories, textile fabric dyeing houses, and high-spec pharmaceutical cleanrooms, steam is an abundant daily resource.
Practically Free Central Air Conditioning: Fabric dyeing and washing facilities require massive boiler plants to run their production lines. By routing a portion of this steam (or utilizing waste steam) into a DMAR-S chiller, the facility can cool its management offices or cleanrooms at near-zero electricity costs.
Boosts Global Sustainability Ratings: Implementing steam-driven heat recovery cooling helps factories achieve high scores on international green building frameworks (like LEED), making your facility a preferred supplier for top global brands.
Procuring, rigging, and balancing a heavy-duty industrial steam absorption chiller requires highly specialized HVAC engineering expertise. Bhai Bhai Engineering delivers professional end-to-end support across Bangladesh:
Direct Factory Sourcing Guarantee: We import directly from authorized global Dunham Bush manufacturing tracks, supplying 100% genuine, brand-new equipment complete with verified serial numbers and original factory warranties.
Turnkey Industrial Mechanical Execution: Our experienced local engineering team manages the complete installation—including high-pressure steam line connections, hydraulic balancing, cooling tower integration, and automated control linkages.
Transparent Local BDT Project Quotations: Avoid unexpected currency shifts or hidden import fees. We provide detailed, transparent financial proposals in Bangladeshi Taka (BDT) tailored to clear corporate reviews or public tender requirements.
Long-Term Specialized Maintenance Support: Absorption systems require precise fluid chemistry. We provide local, factory-trained technicians to handle annual $LiBr$ solution testing, corrosion inhibitor adjustments, and vacuum pump balancing to maximize your chiller's working life.
Turn your industrial steam loops into free, high-capacity central air conditioning. Contact our specialized industrial sales engineering desk in Dhaka today to receive a detailed commercial proposal and technical product data sheets based on your facility's layout configurations.
Corporate Headquarters: Podirdia, Khilbarirtek, Vatera, Dhaka-1212. (Nur-E-Madina Mosjid Complex)
Sales & Project WhatsApp: +8801722039029
Corporate Mailbox: bhaibhaiengineering51@gmail.com
Engineering Platform: https://www.bhaibhaiengineering.com/
Q1: How can steam create cold water inside an absorption chiller?
Ans: It uses a specialized chemical vacuum process. Inside a deep vacuum chamber, water boils at an ultra-low temperature and absorbs heat from your building's cooling loop. A concentrated Lithium Bromide liquid salt solution absorbs this water vapor, and your factory's boiler steam is used to heat and boil the water back out of the salt solution so the cycle can repeat continuously.
Q2: What steam pressures are required to run the Dunham Bush DMAR-S chiller?
Ans: The DMAR-S series can be customized to operate across various industrial steam pressures. Double-effect models typically run optimally on medium-pressure steam streams, while single-effect variations can utilize low-pressure waste steam from processing lines.
Q3: Does this chiller require an outdoor cooling tower setup?
Ans: Yes. Because an absorption chiller must dissipate heat from both its internal refrigeration cycle and the high-temperature steam input, it requires a steady outdoor cooling tower loop to manage the thermal load.
Q4: What happens if the factory boiler shuts down and the steam supply stops?
Ans: The DMAR-S features an integrated microprocessor control panel that constantly monitors incoming steam parameters. If the steam pressure drops below operating thresholds, the system safely modulates internal valves and goes into an automated dilution run to prevent chemical crystallization, waiting safely for the steam source to return.
At Bhai Bhai Engineering, we take pride in our industry-recognized certifications and achievements. Our dedication to excellence in MEP (Mechanical, Electrical, and Plumbing) solutions is backed by various certifications in central air conditioning systems, fire protection, ventilation, electrical installations, and more. These certifications ensure we meet international standards and deliver top-notch service for your business.
Stay updated with the latest events and industry collaborations from Bhai Bhai Engineering. As leaders in MEP services, we actively participate in trade shows, seminars, and workshops to enhance our expertise and bring innovative solutions to the field. Discover our role in shaping the future of MEP design, installation, and maintenance services.
