Marine Dx Unit

HISURP supplies high-performance marine HVAC systems designed for reliable cooling in vessel applications. As a trusted China manufacturer, we provide direct expansion solutions known as Marine Dx Unit, offering efficient heat exchange, compact structure, and stable performance in harsh offshore environments. The system features advanced refrigeration technology, corrosion-resistant housing, and easy-maintenance components to ensure long service life and reduced downtime. Contact experienced suppliers for CE-certified quality, competitive factory pricing, customized configurations, and fast global delivery for bulk orders.

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What is a Marine Dx Unit?

A Marine Dx Unit (Marine Direct Expansion Unit) is a direct expansion air conditioning unit specifically designed for ships and marine engineering. "Direct expansion" means the refrigerant expands and absorbs heat directly in the evaporator, eliminating the need for an intermediate refrigerant, thus achieving higher heat exchange efficiency and faster cooling.

This product features an integrated design, combining a compressor, condenser, evaporator, fan, and control system. It is suitable for independent temperature control needs in cabins such as crew living quarters, bridge, and control rooms. It possesses marine-grade corrosion resistance, vibration and sway resistance, and a compact structure, making it suitable for harsh conditions such as high salt spray corrosion, hull vibration, and trimming during ship navigation.

With over 20 years of experience in the industry's refrigeration technology, the Hisurp Marine Dx Unit, with its high efficiency, energy saving, easy installation, and stable reliability, has become the trusted choice of many shipowners and shipbuilding companies worldwide.

Features of the Marine Dx Unit

The Marine Dx Unit boasts the following core advantages:

Direct Expansion System, High Efficiency and Speed

Refrigerant directly evaporates for heat exchange, eliminating the need for intermediate refrigerant, resulting in high heat exchange efficiency and rapid cooling.

High Corrosion Resistance, Vibration and Roll Resistance

Marine-grade anti-corrosion coating, salt spray test ≥1000 hours, copper-nickel alloy/titanium alloy heat exchanger; vibration-resistant compressor + flexible piping, adaptable to ship vibration and conditions requiring 15° heel and 5° pitch.

High Efficiency and Energy Saving, Precise Temperature Control

Optional DC inverter compressor + EC fan, saving over 30% energy; electronic expansion valve (EEV) for precise temperature control, ±0.5℃ accuracy.

Integrated Design, Convenient Maintenance

Integrated compressor, condenser, evaporator, and fan, facilitating easy installation and saving space; easy-to-clean filter + self-diagnostic function for simple and quick maintenance.

Marine Dx Unit Technical Specifications

Item	Specification Range
Cooling Capacity	2.5KW ~ 30KW (optional)
Heating Capacity	2.0KW ~ 15KW (electric heater, optional)
Cooling Type	Air-cooled / Fresh water cooled / Sea water cooled
Refrigerant	R134a / R410A / R407C
Compressor	DC inverter / Fixed speed (optional)
Power Supply	220V/1Ph/50Hz or 380V/3Ph/50Hz (60Hz optional)
Airflow	500 ~ 3,500 m³/h
Temp. Control Range	18℃ ~ 30℃
Temp. Accuracy	±0.5℃
Ambient Temperature	-15℃ ~ 45℃ (standard) / -15℃ ~ 55℃ (high temp.)
Corrosion Protection	Marine-grade coating, salt spray test ≥1,000 hours
Heat Exchanger Material	Copper tube-aluminum fin / Copper-nickel alloy / Titanium alloy
Anti-Vibration Design	Vibration-absorbing base + flexible connection, adaptable to 15° heel, 5° trim
Installation Type	Ceiling-mounted / Wall-mounted / Split type
Protection Rating	IP44 / IP54
Certification	CE / RoHS / ISO9001, classification society optional (DNV, BV, ABS, CCS, LR)

Projects & Parners

Heinen & Hopman Marine Equipment Co., Ltd. in the Netherlands
Novenco marine & offshore in Denmark
WindeX Engineering BV (ARK) in the Netherlands
Shipbuilding Industry Corporation (SBIC) in Vietnam
OEM Marine Air Conditioners for DAIKIN

Overseas Project Case Study — Marine AHU

Project Name: Nordic Offshore FPSO Living Module Central Air Conditioning System Project

Project Background: Nordic Offshore's FPSO living module (accommodating 120 crew members) in the North Sea required an upgrade to its central air conditioning system, meeting stringent requirements including varying temperature and humidity levels in different areas, multi-stage filtration, high salt spray corrosion resistance, and integration with the ship's integrated management system.

Solution: Hisurp provided two Marine AHUs (25,000 m³/h airflow, 120 kW cooling capacity, 80 kW heating capacity), employing centralized air handling with zoned temperature control; G4+F7+HEPA H13 multi-stage filtration effectively filters salt spray and microorganisms; utilizes waste heat from the main engine cylinder liner for heating, achieving 40% energy savings; copper-nickel alloy heat exchangers with marine-grade anti-corrosion coating, passing salt spray tests ≥1000 hours; PLC controller integrated with the IAS system, achieving temperature control accuracy ±0.5℃ and humidity control accuracy ±5%.

Implementation Results: The temperature in the living area remained stable at 22℃±0.5℃, humidity at 50%±5%, and air quality was significantly improved; zero malfunctions occurred during six months of operation; winter heating energy consumption was reduced by 40%; and remote monitoring and fault early warning were implemented.

Customer Feedback: "The Hisurp Marine AHU's centralized air handling capacity and multi-stage filtration system fully meet our needs; the waste heat heating solution is highly energy-efficient; and the control system integrates perfectly with the IAS."

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