There are many kinds of air conditioners on the market, including wall mounted machines, cabinet machines, and central air conditioners. In recent years, central air conditioners have continued to be popular because of their high comfort, but before purchasing, we need to make a general understanding of the advantages and disadvantages of central air conditioners, so as to know whether they are suitable for our own use!

Duct fan system

Working principle: each set of system is composed of a typhoon cold and hot pump type outdoor unit and an indoor unit. The outdoor unit and the indoor unit are connected through the refrigerant pipe, and the air pipe from the indoor unit stops supplying and returning air to each room. The indoor unit can easily introduce outdoor fresh air, so as to improve the air quality of the room. The room temperature is adjusted by the VAV conditioning installation set at each air supply outlet and linked with the indoor temperature sensor, and the VAV central control is applied to automatically control the total air volume of the indoor unit at any of the high / medium / low levels.

Meaning: the air duct machine is often said to be a one-to-one way. An outdoor unit corresponds to an indoor unit. Its installation mode and effect are the same as that of the central air conditioner. The main difference is that an outdoor host of the central air conditioner can drive multiple indoor units in rooms, while the air duct machines installed in multiple rooms need to be equipped with multiple outdoor units and multiple indoor units. Generally speaking, the air duct machine belongs to the entry-level central air conditioner. You can enjoy the warmth and beauty of the central air conditioner at the price of the ordinary split air conditioner.

Advantages: the advantage of air duct system is that each room adopts air duct to supply and return air centrally, and the indoor noise is low. The relative noise of a room (usually the living room) equipped with air-conditioning indoor unit will be higher. The air duct fan system is convenient for introducing fresh air, and the indoor air distribution can be rationalized according to the arrangement of air vents. The room temperature fluctuation is small, the warmth is high, and because it is a direct evaporation type, it consumes less power and has a high energy efficiency ratio. The air duct system is relatively simple, easy to construct and low in engineering cost.

Defects: the system is difficult to meet the different air conditioning load requirements of multiple air-conditioned rooms at the same time. Special air valves should be set for room conditioning, and there are certain requirements for the floor height of the room.

Multi online system

Meaning: the fluorine system is a primary refrigerant system. The refrigeration and heating speed is fast, and the room temperature can reach the set state in a short time. Moreover, most fluorine machines adopt frequency conversion system, and each indoor machine can be controlled independently. It can adjust the running speed according to the cooling capacity demand of the indoor machine, which is relatively more energy-saving.

Advantages: the operation noise of the indoor unit of the multi connection system air conditioner is low, and the minimum noise is only 27db. The fan coil noise is generally about 40 dB. The system adopts refrigerant pipe connection, and the maximum piping length of indoor and outdoor units can reach 120m, which is different from that of split air conditioning devices, which are limited by the connecting pipes of indoor and outdoor units. The refrigerant pipe is very thin, and the device has no slope request, and the indoor unit can be equipped with condensate lift pump, which can save the ceiling height. Moreover, the condensate lift pump can prevent the reflux of condensate, prevent the leakage of condensate in summer, and damage the interior decoration. Through the connection of signal lines, the indoor and outdoor machines of multi connection system have stable and reliable operation, and the ordinary service life can reach more than 15 years. The system also has a wide operating range, and can make heat even in the cold north.

Defect: since the refrigerant is directly escorted to the indoor unit of the air conditioner, once the refrigerant leaks, it is not easy to detect the leakage, so the request for the refrigerant pipe device is very high. For the air duct system of the cold / hot water system, there are requirements for the spacing and level difference between the indoor unit and the outdoor unit of the air conditioner.

Water system

Operating principle: the outdoor unit is a small air-water heat pump unit, and the cold (hot) water prepared for the air conditioner is sent to each end of the room through the air conditioning pipeline system (fan coil). Fan coil unit adopts local return air to stop thermal exchange with indoor air to complete air disposal. The indoor temperature can be regulated by the electric three-way valve set on the return branch pipe of each fan coil and interlocked with the indoor temperature sensor of each room. It can also be adjusted by the three speed switch of fan coil (when the water volume is constant).

Advantages: the indoor end of the central air-conditioning of the water system exchanges heat with air, and the room temperature changes slightly, so the refrigeration and heating are relatively warm. In addition, the water machine can also be used as a dual-purpose machine. In addition to ensuring warm refrigeration in summer and mild air outlet, it can also be matched with ground heating and heating in winter. It is safe and reliable. The temperature rises on average from the air and is heated gently. At the same time, because the pipeline system is a water system, compared with the air duct system, the requirement for building floor height is not high. The end mounted fan coil unit is small in size, diverse in types, and convenient in layout and installation. The operation noise is low and the indoor environment is quiet.

Defects: the waterway system is complex when it enters the room, and the careless operation of the device and the discharge of condensate are easy to cause hidden dangers of ceiling water leakage and damage the interior decoration. And the condensate coil may breed bacteria and microorganisms, which will affect the health of the body. Maintenance work is difficult to stop. It is difficult to deal with fresh air, and the indoor air quality is relatively poor.