Fan coil units have gone through several different changes.
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Fan coil units have gone through several different changes.
In the early days, the understanding of fan coil units was mainly based on meeting the air volume requirements. It is believed that as long as the air volume is large, it meets the requirements and it is a good fan coil unit.
Under the guidance of this concept, the main feature of the fan coil units produced at that time was that the air volume generally exceeded the standard, which resulted in high noise and high energy consumption. The cooling capacity per unit power of the fan coil units produced at that time was tested. Only about 40W.
Due to the loud noise, the situation at that time was that while people enjoyed the cool breeze brought by the air conditioner, they also had to endure the annoying noise. In order to solve the above problems, the country began to revise the product standards for fan coil units.
The fan coil manufacturing industry has developed rapidly, and the annual output has surged from thousands of units in the early 1980s to more than hundreds of thousands. Up to now, product upgrades have been completed and a new generation of products has been launched.
Fan coil units are an ideal terminal product for central air conditioning. Fan coil units are widely used in hotels, office buildings, hospitals, commercial and residential buildings, and scientific research institutions.
It is understood that in order to meet the design and selection of different occasions, there are many types of fan coil units, such as horizontal concealed fan coil units (with air box), horizontal exposed fan coil units, vertical concealed fan coil units, vertical There are many types of surface-mounted fan coil units, cassette-type two-outlet fan coil units, cassette-type four-outlet fan coil units and wall-mounted fan coil units.
The selection of fan coil units is a key issue.
It is a common practice in the design of air conditioning systems to select fan coil units according to the maximum cooling load of the air-conditioned room. The purpose is to ensure the room temperature during peak load. Most of the time the air-conditioned room is running, it will not be at peak load, causing excess cooling capacity. Instead, it switches to medium and low-range operation to reduce the cooling output, thereby maintaining the thermal balance of the room. When selecting a fan coil unit, in addition to the cooling capacity meeting the calculated cooling load requirements, it is also required to meet the matching of sensible heat and latent heat to meet the room heat-humidity ratio requirements; the air volume must meet the supply air temperature difference, number of air changes and air flow organization and other usage requirements. As the terminal equipment of central air conditioning, the quality of fan coil determines the indoor air conditioning effect.
At the same time, its cleaning problems also directly affect the use effect of central air conditioning. There are many dust particles in the atmosphere. Under the action of long-term extraction and return air, the aluminum fins of the fan are filled with dust and dirt. At this time, on the one hand, it affects the heat exchange between the chilled water and the hot air, causing the air temperature to drop; on the other hand, it affects the temperature of the air; On the one hand, it also affects the delivery of cold air that has been cooled after heat exchange, resulting in the phenomenon that the air conditioner is turned on but the room is still not cold. Because the central air conditioning host sends 7-degree water into the fan coil after cooling, and exchanges it in the fan coil to become 15--16-degree cold air, which lowers the room temperature.
