Precautions for the selection of fan coils for large central air conditioners

Precautions for the selection of fan coils for large central air conditioners

The fan coil unit is an important component in a large central air-conditioning system. Its selection will directly affect our usage, such as cooling effect, power consumption, noise impact, etc. How to measure these conditions, we can according to the fan coil Some parameter indicators to select the corresponding specifications. The following editor lists a few precautions for the selection of fan coils for large central air conditioners to share with you.

　　 Precautions for the selection of fan coils for large central air conditioners-motor power

　　 Many people in the industry now believe that the fan coil technology is already mature and the product quality is similar. Therefore, only the brand can be selected. As everyone knows, the motor power of the fan coil is a factor that must be considered. Some motor power comparisons show that the difference between the two is 13W. Taking a fan coil unit in a certain area as an example, it runs for 10 hours a day and 200 days a year, which can save 26 kilowatt-hours of electricity per year. If there are 500 such fan coil units in a building , A year is also an expense. Although there is a certain price difference in the initial investment, the increased initial investment can be recovered in about 3 years. Everyone knows how to choose a more cost-effective economic account.

　　 Precautions for the selection of fan coils for large central air conditioners-air volume

　　 At present, when we carry out specific engineering design, we often select fan coils based on the calculated cooling load by consulting the samples of relevant manufacturers. How to consider the air volume of the coil is a problem. Most manufacturers in the domestic market have only one type of three-row coil, but some manufacturers provide two-row coils. The author believes that it is more advantageous to choose two-row tube coils for most civil building air conditioning systems (except for high humidity occasions). This is because the product of the second row of tubes has a larger air volume under the same cooling capacity, which will increase the number of air changes in the air-conditioned room and help improve the accuracy and comfort of the air-conditioning. With the same cooling capacity, using small temperature difference and large air volume to supply air will achieve better air conditioning effects than large temperature differences and small air volume.

　　 Precautions for the selection of fan coils of large central air conditioners-external static pressure

Generally, the fan coil parameters of the sample are all parameters obtained under the state of 0 static pressure. In actual use, a small section of air duct and air outlet shutters are often connected before the air outlet of the coil. In addition, some projects also have a return The wind box, therefore, in actual use, you will find that the actual air volume of the coil is less than its nominal air volume. The consequence of this is that the room air volume decreases, the supply air temperature difference increases, and the comfort of the air conditioner decreases. In order to avoid this situation, some designers choose according to the mid-range air volume of the coil during the selection to avoid insufficient air volume, but increase the initial investment of the project. Therefore, the author suggests that when the domestic test standards have not changed, we should give priority to the unit with residual pressure (generally 10-15Pa) when selecting the coil type.

　　 Precautions for the selection of fan coils for large central air conditioners-noise problems

　　 The noise problem is the most complained point when the air conditioner is used. The reason for this problem is mostly the unreasonable configuration and matching of the motor and the fan in the coil. In addition, the manufacturer's quality management is not strict, and the assemblers are not very responsible, which causes unstable product quality.

　　 Precautions for the selection of fan coils for large central air conditioners-cooling capacity 　　 When selecting a model according to the design, it is necessary to select a model with sufficient cooling capacity to prevent some manufacturers' production processes and some deviations during processing that cannot meet the cooling requirements. Especially in the outer area and the area with a large heat load, the cooling capacity is also one of the indicators for selection considerations.

　　 In addition to the above points, we also need to understand from the appearance whether the wind plate has overall heat preservation, whether the length of the water receiving plate is long enough and so on. Choosing reliable products can make people feel at ease.