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AHU » Modular AHU

Reliable quality
For the 3rd generation of Midea MAHUs, reinforced frame is built in the section connection gap to enhance the structure for large air flow volume and high air pressure. The MAHUs’ construction provides unequaled thermal efficiencies and low leak rates. In addition, the MAHUs offers tremendous flexibility in sizing, component options, and unit arrangements to meet the indoor air quality, operating efficiency, sound and installation requirements for today’s extensive commercial and custom markets. Also, Midea combines comprehensive performance certifications with thorough laboratory testing and manufacturing methods. These assure that each MAHU operates predictably and reliably throughout the life of the unit.
Modular design
The MAHUs adopt modulus design. Usually including mixing section, primary efficiency filter section, medium efficiency filter section, high efficiency filter section, cooling coil section, heating section, humidifier section, sound attenuator section, service section, heat recovery section, fan section and so on. Function sections can be combined freely. Different function sections can be selected according to the specific applications. The MAHUs can be shipped in divided sections. Each section is wholly completed at manufacturer’s work place, and only connection of sections can be done at site. Oversized units cannot be fitted in normal container shipment or cannot be delivered through access at site can be considered shipment in complete knock down form, but reassembling works must be done by engineers of the manufacturer.
Coil
In Midea MAHUs, there are three typical types of coils: chilled water coils, hot water coils and steam heater coils. All coils are provided to meet the scheduled performance. Coils are consisted of copper-tubes and aluminum fins. The fins are sine-wave design with slits for better heat transfer efficiency and moisture carry-over limit performance. All coils are installed with space between each component for cleaning and mounting of controls. All cooling coils are mounted over a drain pan. The drain pan extends beyond the leaving side of the coil to help recover condensate. Coil connections always extend through out of the unit cabinet, allowing for the easy connection of valves and piping. Vents are located outside the cabinet.

Humidifier
Usually, there is no humidifier installed in the MAHUs for comfort air conditioning systems; but the outdoor climate is very cold in winter so that if a humidifier is not employed, the winter indoor relative humidity may be too low. Humidifiers are necessary for health care facilities and processing systems in pharmaceutical, semiconductor, textile, communication centers, and computer rooms. In Midea MAHUs, wet film vaporization, dry steam, electrode boiler, and water spray humidifiers are widely used. Wet film vaporization humidifier is a type of enthalpy humidifier or evaporation gasification humidifier. Through the principle of exchange of heat and moisture, the air is humidified and cooled. The medium is inorganic material which is high-life, high reliability, clean, good heat conduction and bacteria resistance. Dry steam or electrode boiler humidifiers are widely used in where a warm air supply and humidity control are needed in winter.

Filter
Air filtration is an important component to achieve an acceptable indoor air quality. In MAHUs, earlier low-efficiency filters of the panel type are giving way to the medium- and high-efficiency bag type and cartridge type of filters. Filter section is consisted of galvanized steel filter frame structure and an access door for filter maintenance. Low efficiency plate filter is designed as standard. Bag, cartridge and other high efficiency filters is optioned. The structure of filters are stable and firm, high strength and intensity, and easy changing. Filter can be loaded from both left and right side. Front loaded is optioned. The filters efficiency is up to 95%.

Air dampers
Air dampers in MAHUs are optional. Aerodynamically designed damper blades have built in high quality bearings. Blade edges are lined with sealing strip to restrict leakage to an absolute minimum. Air damper blades are either linked to give parallel turning operation or gear set to give opposing direction. The dampers are tested to yield linear control characteristic. Mixing dampers working in pairs and can be coupled in such a way that if one is 75% open the other is 25% open.