【 Weak current College 】 air-conditioning fan coil reasonable choice---Power By 【 China power house network 】

Fan-coil is a centralized air-conditioning system, extensive use of terminal equipment. Air blower plate Tube selection of not only directly affects air conditioning effect, also is to guarantee the normal system operation and reduced energy consumption of important links, particularly in high-precision or strict technical requirements of occasions, but also requires reasonable air parameters.

Ventilation and cooling (heat) is the basic of the fan coil. "Wind" is "cold" media and the carrier, it directly affected the cooling capacity, air temperature, ventilation and temperature gradient and the number of volatility, which determines the precision and comfort air conditioning.　　Therefore, ensure that sufficient air is the achievement of the expected air conditioning effects prerequisite. It should be noted that this volume is the number of units in the normal use of the actual air. According to room size and a minimum clear space of ACH, you can find the minimum air. On high-precision technology of air conditioning, air flow check is necessary proceedings for Computing Center. In the selection of homemade air blower plate Tube, cannot be calculated, press the sample parameters selection, because domestic air blower plate Tube sample air volume in the name of the column to be higher than the actual air flow.

Our original Ministry of machine-building industry standard fan coil unit of JB/T4283-91: nominal air flow stated in must be in coil not water, air and export static differential pressure of zero for specific conditions. However, fan coil of actual use conditions is clearly different from the test conditions: practical use, dark machine groups often wish to retrofit into, back to the style bar, filter and short wind pipe, plus coil surface condensation water, dust and filter clogging and many other factors, will result in increased, decreased amount of wind wind resistance. Ming-mounted unit also exist air volume decline, just drop a small, so the domestic air blower plate Tube is bound to the actual air flow is lower than the nominal value. While the air force, and will cause the chilling down, thus forming a unit of actual performance (wind, cold) are lower than the nominal value, so that the air conditioning system is not up to the original design. As a result of domestic blower fan coil pipe name parameter in actual use conditions are not reproduced and therefore cannot be used as a basis for the selection of products. The industry standard in China, as well as the manufacturers samples given nominal parameters on dark machine group, actually is meaningless. Because of its normal use, cold condition air flow than the nominal air flow low 20% ~ 30%, and long-term operation of the unit or even 50% or more.

Foreign air blower plate Tube samples generally gives different machine external static pressure of the air flow and cooling capacity to facilitate the user to select. Some foreign concise sample although only gives the nominal air flow, but its meaning is different from our standard provisions, it generally refers to a certain machine external static pressure of the air flow values, the nominal air flow similar foreign air blower plate Tube, air flow rate is higher than the domestic unit 20% ~ 50%.

Similarly need to emphasize that the use of foreign concise sample, it should be noted that foreign companies often perform different standards, meaning the nominal air flow will also be some differences exist. So the best choice, based on the data range of the latest samples, or ask suppliers manufacturers provide products in different machine external static pressure of the air flow and cooling capacity value to determine the reliability.

Coupled with increased air flow is not only able to ACH, lower air temperature difference, improving air conditioning effect, because the cold, so you can narrow the unit volume. Therefore, foreign air blower plate tube size and weight, generally toless-than-made fan. Improving machine external static pressure and air flow, a blower fan coil pipe direction of development. Of course, the improvement of air volume to be air conditioning area allows the restriction of the wind speed.

At present, China's air conditioning designers generally used by the samples supplied mid-range arguments made by fan-coil. While this may to some extent compensate for the shortcomings of the air flow is not enough, but at the same time, because of the large machine small use to not only increase system capacity, improves engineering cost, but makes chillers with consistently high flow, small temperature difference in a bad state. Lead to inefficiencies in the system, energy consumption increased. This is not the same as the current reduce energy consumption, energy saving, environmental protection is an international trend.

To sum up, in the selection of the blower fan coil pipe air conditioning system, not only to achieve the design calculation accuracy, but also on the current market the different features of the various products, rational selection to create a comfortable, economical and reasonable air conditioning system.