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Refrigerator Air Conditioner

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Refrigerator Air Conditioner

Refrigerating technology has been indispensable in the constant improvement of living conditions on board. Without this it would not be possible to provide a balanced and healthy environment in comfortable living quarters with a controlled and pleasant climate.
Depending on size, operating conditions and general arrangement of the air conditioning system, various system layouts are available: From the simple ones consisting of one condensing unit operating one air cooler, to the more complex solutions of combined liquid chiller units operating a number of air coolers. In the latter case advanced microprocessor or PLC based regulation and control system are available.


Condensing Unit Type MCU

Each unit is built up on a sturdy bed frame and composed of compressor block, electric motor, oil separator, condenser and drier, etc. Full complement of operating and fail-safe controls and breakdown of machinery, renders automatic operation, including automatic capacity regulation to minimize operating costs.


Compressor is open or semi-hermetic reciprocating type. The cooling capacity of open type ranges from 80kW to 830kW. The cooling capacity of semi-hermetic type ranges from 80kW to 300kW. Also, screw compressor is available. The automatic unloading system regulates the compressor capacity by connecting or disconnecting the cylinders in pairs. The capacity regulation is done by solenoid valves mounted on the compressor. The solenoid valves are activated by suction pressure.

Condenser is of horizontal shell & tube type. The refrigerant vapors in the shell side are condensed by seawater or fresh water in tube side. The condenser has one special feature that the refrigerant vapors from cooler pass through the tubes located at lower part of the condenser, so the condenser acts as a liquid separator & sub-cooler by exchanging the heat between cold refrigerant vapors coming from the cooler and the hot condensed refrigerant from the compressor. The cooling water tubes are made of copper for fresh water service, and Cu/Ni (90/10) for seawater service to prevent corrosion.

Pressure switch for capacity regulation

  • Pressure switch for capacity regulation
  • Low/High pressure control switch
  • Oil differential pressure control switch

Unit controls
A solenoid valve is placed in the refrigerant liquid line before the coller and a duct thermostat is placed in the return air supply duct. When the duct thermostat reaches the "set point", it wil give a signal to the solenoid valve to shut off the liquid refrigerant to the cooler, then the low-pressure control switch will make the compressor stop.


Air Handling Unit

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Air Handling Unit (AHU, Air Conditioner)

Hi Air Korea air handling unit can be used with SINGLE-PIPE AC System, TWIN-PIPE AC system and RE-HEAT AC System (electric reheater or hot water reheater) with the combination of different types of cabin units.
The HKA unit is built up on a sturdy bedframe made of steel and will include all sections required to suit very individual specification. It is manufactured in eleven sizes with air capacities ranging from 0.53 to 13.61 m3/s.
Hi Air Korea air handing unit type HKA is specially designed for marine installations of air conditioning. Each section is designed as a modular system and consists of a rigid framework made of square sections with specially assembled corners. The sections are made of galvalume steel sheet and internally well insulated.
Equipment such as fan, motor and filter mat can be simply removed from its section through inspection doors fitted to ensure easy maintenance.
The condensed water from cooler, humidifier and water eliminator drop into pans and drains out of the unit. The unit can be hooked up by means of eye-plated mounted in each corner of the bed frame. Each component comprising the air handling unit is high quality equipment designed for marine application.

Mixing section
Mixes the fresh air from outside with return air coming from the served area. Automatic or Manually operated dampers are fitted to control the quantity of fresh air and return air.

Filter section
FIlters dirt particles contained in outside air by means of a washable polyamide filter mat. After removal of the service door the filter can easily be drawn out and replaced by new filter mat.

Heating section
Heats the mixed air by means of steam, electricity, hot water or thermal oil during winter season. Steam heater is generally used for accommodation's heating and the coil is constructed with aluminum fins on seamless copper tubes.

Cooling section
Cools the mixed air by means of direct expansion of refrigerant or chilled water during summer season. The coil is constructed with aluminum fins on seamless copper tubes.

Humidifying section
Maintains suitable humidity of accommodation spaces by injecting steam or water. This is necessary because the humidity of heated outside air at winter season is very low. Humidifier is constructed with spray nozzles for steam or hot fresh water.

Water elimination section
This section is placed after cooling section and prevents the condensed water from carrying over into fan section.

Fan section
Supplies the conditioned air from heating or cooling coil to accommodation spaces and contains a centrifugal fan of could be single inlet. The fan unit is mounted on vibration dampers.

Distribution section
Distributed section distributes the conditioned air to the dusts and in insulated with sound adsorbing material to reduce the noise emitted from the fan.

Last Updated ( Monday, 04 June 2012 02:51 )

Cabin Unit

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Cabin Units


  • Hi Air Korea cabin units are specially designed for the supply of conditioned air to ship's accommodation via the spiral duct air pipe system. For each type of Hi Air Korea system (Single-pipe, Twin-pipe, Re-heat), there are a comprehensive range of cabin units comprising units for bulkhead mounting or ceiling suspension, units supplying the conditioned air through a grill, a ceiling diffuser or a punkah louver.
  • Hi Air Korea cabin units are made in sizes to suit the ventilation requirements as well as the heating and cooling loads. All unit have an air volume control device by means of which the air flow delivered can be varied from nil to a predetermined maximum. Units intended for Twin-pipe and Re-heat installation provide individual temperature control, independent of the air flow control.
  • In the design of the units, special attention has been devoted to sound attenuation, and in relation to the ambient sound levels occuring in ship's accommodation, very satisfactory sound levels have been achieved.
  • For each type of Hi Air Korea system (Single-Pipe, Twin-pipe, Re-heat) there is a conprehensive range of cabin units for ceiling suspension or bulkhead mounting.


Single-Pipe Manual control

  • Cabin unit designation: MS TYPE
  • Location of cabin units: Ceiling
  • Air supply device: Diffuser Grill Push

Twin-Pipe Manual control

  • Cabin unit designation: MT TYPE
  • Location of cabin units: Ceiling
  • Air supply device: Diffuser Grill

Twin-Pipe Auto control

  • Cabin unit designation: AKV TYPE
  • Location of cabin units: Ceiling
  • Air supply device: Diffuser


  • Cabin Unit Designation: RS TYPE & NAV TYPE
  • Location of cabin units: Ceiling
  • Air supply device: Diffuser Grill