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High-Volume Dual-Fan Cooling for Deep-Freeze Environments
The D3.1E9 is a high-efficiency, ceiling-suspended evaporator unit engineered specifically for deep-freeze storage spaces down to -35 °C. Powered by dual 300 mm low-temperature external rotor fans, the unit moves a high air volume of 4400 m³/h (2*2200 m³/h) with a powerful 10-meter air throw. This dual-fan configuration provides broader, more uniform air distribution than single-fan units, ensuring that there are no stagnant warm pockets in your frozen food lockers, blast-freezer prep zones, or medical storage facilities.
Extra-Wide 9.0 mm Fin Spacing for Maximum Runtime
At extreme sub-zero temperatures, frost accumulation on evaporator coils is rapid and aggressive. The D3.1E9 addresses this with an extra-wide 9.0 mm fin pitch (3 FPI) and a staggered copper tube layout. The inner-grooved copper tubes dramatically increase internal surface area for superior heat transfer, while the wide fin gaps allow significant frost to build up before blocking airflow. This design keeps the unit running longer between defrost cycles, drastically reducing temperature fluctuations and overall energy consumption.
Efficient Electric Defrosting & Rugged Design
In a deep-freeze environment, a failing defrost cycle leads to immediate system failure. The D3.1E9 features a robust 3.5 kW electric defrost system with high-grade stainless steel heating elements installed in both the coil block and the drip pan. This dual-zone heating ensures that melted frost is fully evacuated through the 1" drain port before it can refreeze. Built with a corrosion-resistant pre-painted steel housing and aluminum internal tube sheets, each unit is factory pressure-tested to 2.8 MPa to guarantee a leak-free operational life.
Product Images
Technical Specifications
Parameter
Value
Model
D3.1E9
Nominal Cooling Capacity
3.1 KW
Air Volume
2x2200 m³/h
Fan Power
2x145 W
Voltage
220/380 V
Liquid Inlet / Suction Outlet
12 mm / 19 mm
Defrost Power
3.5 KW
Company Profile
Ruifujie stands as a premier force in the industrial refrigeration sector, backed by more than 20 years of dedicated research, development, and manufacturing excellence. Our state-of-the-art facility specializes in producing high-performance cooling solutions, ranging from industrial-grade evaporators and air-cooled condensers to heavy-duty screw and semi-hermetic reciprocating compressors. By integrating advanced thermodynamic engineering with automated production processes, we ensure that every unit meets the highest international standards for energy efficiency and operational safety. We are committed to empowering our global partners with tailor-made cold chain solutions, offering robust OEM/ODM support that has successfully positioned our systems in demanding cold storage facilities across Europe, North America, and the Middle East.
Packaging and Shipping
Frequently Asked Questions
How does the staggered copper tube layout with inner-grooved pipes improve the thermal efficiency of the evaporator?
In low-temperature environments, standard smooth copper tubes can develop a thick internal oil film that acts as an insulator, severely reducing heat transfer. By utilizing inner-grooved copper tubes, we vastly increase the internal surface area and create refrigerant turbulence that disrupts this oil film, maximizing heat exchange. Additionally, the staggered pipe layout forces the passing air into a tortuous path, significantly raising air-side convective heat transfer without increasing fan power consumption.
Why are external rotor fans with IP55 protection and Class F insulation crucial for walk-in freezer applications?
Walk-in freezers operate under extreme humidity swings, particularly during defrosting cycles or when doors are frequently opened. An IP55-rated external rotor fan is completely sealed against dust and high-pressure moisture ingress, protecting the internal motor winding. Furthermore, Class F insulation allows the motor windings to safely handle internal temperatures up to 155°C, ensuring that the motor remains highly reliable and won't burn out during prolonged, continuous operation in harsh sub-zero conditions.
What is the significance of the 2.8 MPa factory pressure test for low-temperature evaporators?
Refrigeration systems undergo severe thermal expansion and contraction as they cycle between cooling (down to -42°C evaporating temperature) and electric defrosting. This continuous expansion can cause joint fatigue and micro-leaks over time. Testing every single evaporator at 2.8 MPa using clean, dry air ensures the ultimate integrity of every copper bend and tube-to-sheet joint. This test pressure is significantly higher than the standard operating pressures of low-temperature refrigerants like R507, guaranteeing years of leak-free performance.
Do you offer tiered pricing for commercial distributors or large-scale contractors?
Yes, Ruifujie operates a tiered pricing framework specifically tailored for cold room contractors, international commercial distributors, and engineering networks. Our pricing structure is highly competitive and is optimized based on your annual procurement volume, container loading efficiency, and specific project technical requirements.
What technical details do I need to provide to get an official quote, and how long does it take?
We will provide an official quote within 8 hours of receiving your detailed technical parameters. To generate an accurate quote, we require customers to provide details such as the required cooling capacity, operating voltage, refrigerant type, and specific working conditions.
Custom Engineering & Support
Ruifujie provides competitive wholesale pricing and technical layouts for cold room contractors, engineering firms, and commercial refrigeration distributors. If you are designing a low-temperature storage project and need technical layouts, tailored wiring schematics, or bulk pricing, please send us your room dimensions and local power specifications. Our technical sales team will assist you with equipment matching and provide an official commercial quote within 8 hours.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Year Established:
2006
Total Annual:
44000000-60000000
Employee Number:
110~115
Ecer Certification:
Verified Supplier
Shenzhen Ruifujie Technology Co., Ltd is a leading supplier of high-quality compressors for a wide range of industries and applications. With over 14 years of experience in the industry, we have built a reputation for
providing exceptional products and services to our customers.
&nb... Shenzhen Ruifujie Technology Co., Ltd is a leading supplier of high-quality compressors for a wide range of industries and applications. With over 14 years of experience in the industry, we have built a reputation for
providing exceptional products and services to our customers.
&nb...