Chilled water system (direct evaporation type)

The refrigerant is used as the transmission medium. The refrigerant directly evaporates in the evaporator of the indoor unit and exchanges heat with the air. It is a primary heat exchange system. Composition and principle: It consists of an outdoor unit, multiple indoor units, refrigerant copper pipes, branch pipes, and a control system. The outdoor unit integrates the compressor, condenser, and throttling device, providing power for the system; operation follows the vapor compression refrigeration cycle, and during heating, the flow direction is switched through a four-way valve. Main models use DC inverter compressors, which can adjust the speed and refrigerant flow continuously, adapting to load changes.

Features: Fast response for cooling and heating, reaching the set temperature within 5-10 minutes after startup; temperature control accuracy is ±0.5℃; the pipe diameter is small, occupying less ceiling space, without the risk of water leakage, and the indoor unit can be independently controlled. The disadvantage is that there is a capacity attenuation in long-distance transmission, the difficulty in detecting refrigerant leakage is high, excessive dehumidification is likely to cause indoor dryness, and failure of the outdoor unit will cause all indoor units to stop. Common end units include ducted indoor units, cartridge embedded indoor units, wall-mounted / floor-standing indoor units, and fresh air treatment indoor units.

Fan duct indoor unit

Fan duct units are the mainstream end devices for home decoration and small-scale commercial use. They are available for both fluorine and water systems and can be connected to ducts to optimize air flow distribution. They are classified into low static pressure side supply type and medium-high static pressure long duct type based on static pressure.

Low static pressure side supply type (10-30Pa): The piping is simple, the construction is convenient, and it can be paired with double-layer grille air outlets to adjust the air supply direction and achieve attached air supply. The body thickness is 180-220mm, suitable for 220-250mm ultra-thin ceilings, with low-end operation noise of 22-28dB(A), suitable for bedrooms, study rooms, etc., small spaces.

Return air method

Side supply and then return: The air resistance is small and the noise is low, suitable for bedrooms with long corridors, with a maintenance opening of ≥450mm×450mm.

Side supply and bottom return: The ceiling occupation depth is the minimum (about 700mm), suitable for cramped spaces, and can be maintained through the return air outlet.

Side supply and side return: Suitable for spaces with only side suspension, with the distance between supply and return air outlets ≥1m, and a separate return air chamber is set in the ceiling; for kitchen and bathroom scenarios, oil-proof and heat-insulating treatment is required to avoid the exhaust system.

Medium-high static pressure long duct type (50-150Pa): It can be connected to long-distance ducts and multiple air outlets, suitable for irregular, high-pitched, and full-coverage spaces. The conventional model thickness is 300mm, requiring a 350mm or above ceiling; the ultra-thin model thickness is 200mm, suitable for 240mm ceilings.

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