Air To Water Heat Exchanger Hot / Chilled Water Direct Expansion Coils Dx Coil

A direct expansion air conditioning unit, also called a DX unit, cools indoor air using a condensed refrigerant liquid. The DX coil cools air by passing the condensed refrigerant through a heat exchanger inside the building to be cooled. In this part of the unit, called the evaporator, the refrigerant expands as it absorbs heat, eventually converting to a gas.

Advantages of Direct Expansion System: low installation costs, ease to adjust and balance the system, minimum ceiling or wall space needed, low energy consumption, low maintenance costs. individual section can be operated without running the entire system in the building, comfort under varying load conditions and good relative humidity control.

Direct expansion coil or DX coil is Shenzhen Hylita 's most important production. Compared with water coils, not only more difficult process , it requires more complicated copper fittings brazing and circuit design, more high-levels inspection standards. The quality and stability of products also need to be higher level to prevent leakage of filled refrigerant.

In direct expansion system, there is possibility of refrigerant leakage for long distances, and the cost of the refrigerant would be high. Also the pressure drop in the line would decrease evaporator coefficient of performance and efficiency.The direct expansion coil is preferred for air conditioning purposes, where the evaporator is very near to the compressors. This is direct method of cooling the substance and, therefore quite efficient.

We make tubes of different diameters, with a greater number of thicknesses and different materials such as copper, stainless steel and cupronickel. The tube expansion, during the flaring phase, allows a perfect contact between the tubes and the fins and as a consequence it assures efficient thermal exchange.

The fins, made of aluminium, prevarnished aluminium or copper, are pressed by means of a particular ondulation that increases the thermal exchange between the air and the fin reducing the load losses on the air side and encouraging at the same time the flow of condensation or defrosting water. The fins can also be made from 316L stainless steel for installations where the thermal exchange is in aggressive environments such as the food sector or exchangers used in salty environments. The main geometries, achievable according to the chosen material, are reported following below; besides, according to the application chosen by the customer and to the thickness of the requested strap, it will be possible to make a major or minor pitch between the fins.

The Plates, Thanks to its accurate three-dimensional design and to modern punchers and numerical control bending machines, it is possible to make carpentry and structures of different sizes that can be adapted to any construction requirement of the customer.

Standard packaging is wooden crates.
For exports to European countries, the wooden crates undergo fumigation treatment.
If container space is limited, we can switch to PE film packaging or accommodate special packaging requests from customers..

With 18 years of strategic partnership, we have successfully designed, manufactured, and exported heat exchangers to over 50 countries worldwide.
Customer feedback consistently confirms that actual cooling performance aligns precisely with theoretical design values.
We can provide detailed drawing after your order.We can also provide Custom services.

Since 2015, Shenzhen Hylita have been a dedicated manufacturer and global exporter of industrial heat transfer equipment, including Evaporators, Condensers, Air coolers,Finned tube heat exchanger,Dry cooler,economizers and other heat transfer equipments

Shenzhen Hylita is a company specialized in R&Dand production of various heat exchangers, is a high-tech production and service in heat exchangersystem design and complete set of equipment solutions.Shenzhen Hylita provide high quality products and energy efficient industrial solutions for HVAC, power,metallurgy, chemicals, power machinery and food etc.

Shenzhen Hylitahas developed the capability to manufacturecoils with a wide range of materials including copper, brassCu-nickel, aluminum,carbon steel, hot-dip galvanized steelTitanium and stainless steel.

1.. Quality Control
Q: How do you ensure the quality before shipment?
A: Our reputation is built on 4 core quality pillars
✅ Experience : Specialized manufacturer since 2015 (10+ Years).
✅ Certifications: ISO 9001:2015, CE, ROHS
✅ Assurance : 100% pressure testing on every unit before shipment
✅ Global Trust : Successfully serving clients in over 50+ countries.

2. Design & Calculation
Q: No drawing? Can you design for me?
A: Yes! We use HTRI software for precise sizing. Just share your operating data (Temp/Flow), and we will provide a professional design for your approval.

3. Minimum Order Quantity (MOQ)
Q: What is the MOQ? Can I place small order please ?
A: Small order is also welcome in our company.

4. Warranty Service
Q: How long is the warranty coverage?
A: We offer flexible warranty options to match your needs:
✅ Standard: 12-Month for all orders.
✅ Extended: Up to 24-Month for eligible customized orders (confirm with our team).

5. Customization
Q: Do you support OEM/ODM and custom branding?
A: Yes, full customization available. We support custom materials (Copper, SS304/316, Cu-Ni) and offer Laser Marking & Nameplates to feature your logo perfectly.

6. Service Commitment
Q: How do you keep me updated on my order?
A: We ensure 100% Process Transparency
✅ Double Confirmation: All specs verified before production starts..
✅ Visual Updates: We send photos/videos of the manufacturing progress.
✅ Document Review: Draft documents (B/L, Invoice) sent for your approval before final issuance to avoid errors.

7. Main Products
Q: What are your main products ?
A: We mainly produce air heat exchangers, surface coolers, evaporator coils, condenser coil, shell and tube heat exchangers, plate heat exchangers and other heat exchange equipment and all kind of finned tubes, heat exchange accessories, etc.

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