Fan coil selection sample central air conditioning terminal wind plate parameter configuration replacement inner core radiator

Product selection points 1. Unit selection of main control parameters rated air volume, outlet static pressure, input power, rated cooling capacity, rated heating capacity, noise, water resistance, etc. 2. The air supply volume of fan coil unit is about 250~2500m/h, and the outlet static pressure is less than 100Pa (the outlet static pressure is higher than 30Pa). 3. The unit specification shall be determined by factors such as cold and heat load of the room and heat and humidity ratio of the air: 1) When the fresh air and room air parameters are equal, the fan coil unit only bears the cooling and heating loads generated by the enclosure and the interior of the room; 2) When the fresh air enthalpy is greater than or less than the room air enthalpy, the fan coil unit should add or deduct part of the fresh air cooling and heat load; 3) When the absolute moisture content of fresh air is lower than the room air moisture content and can fully bear the room moisture load, the fan coil can only bear the sensible heat load of the room, and it should be configured according to dry conditions; 4) When the sensible heat load of the room occupies a large proportion, the air volume of the fan coil unit should be checked by sensible heat balance calculation. 4. The basic specifications of the unit at high speed shall comply with the provisions in Table 1 and Table 2. basic specifications specification Rated air volume (m3/h) Rated cooling capacity (kW) Rated heating capacity (kW) FP-34 340 1.80 2.70 FP-51 510 2.70 4.05 FP-68 680 3.60 5.40 FP-85 850 4.50 6.75 FP-102 1020 5.40 8.10 FP-136 1360 7.20 10.80 FP-170 1700 9.00 13.50 FP-204 2040 10.80 16.20 FP-238 2380 12.60 18.90   Basic specification parameter table   specification Rated air volume (m3/h) Input power (W) Noise [dB(A)] Water resistance (kPa)         low hydrostatic unit high hydrostatic unit low hydrostatic unit high hydrostatic unit           30Pa 50Pa 30Pa 50Pa           FP-34 340 37 44 49 37 40 42 30 FP-51 510 52 59 66 39 42 44 30 FP-68 680 62 72 84 41 44 46 30 FP-85 850 76 87 100 43 46 47 30 FP-102 1020 96 108 118 45 47 49 40 FP-136 1360 134 156 174 46 48 50 40 FP-170 1700 152 174 210 48 50 52 40 FP-204 2040 189 212 250 50 52 54 40 FP-238 2380 228 253 300 52 54 56 50    5. When selecting units, the deviation between actual performance and rated value should be considered, and the following characteristics should be noted: 1) The rated cooling capacity of the unit is generally the test value under the condition that the air enthalpy drop value is equal to 15.9kJ/kg; 2) The rated heating capacity of single coil unit is generally 1.5 times of the rated cooling capacity; 3) All parameters of rated value are the values of fan at high-end speed, and the design should generally be selected according to the value of mid-range wind speed of product sample. If the product does not provide rating data under different wind speeds, please refer to Table 3 for conversion.   Table 3 Air Volume Conversion Factor Rating category high wind speed medium wind speed low wind speed blast capacity 1 0.75 0.50   6. For fan coil units with dual-pipe water systems (suitable for air conditioning systems that only perform heating or cooling conversion according to seasons or only according to air conditioning zones), only one coil is configured, and both winter and summer heating/cooling models are provided. For fan coil units with four-pipe water systems (suitable for air conditioning systems with frequent heating/cooling transitions), combined models with two sets of heating and cooling coils shall be provided. 7. For low temperature, cold storage air conditioning system, should choose large temperature difference unit. 8. Currently, fan coil units have the following control types: 1) With three-speed selector switch, winter and summer conversion, through the room temperature controller linkage waterway electric valve, automatic control; 2) With three-speed selector switch, winter and summer conversion, through the room temperature controller linked fan on and off, the implementation of semi-automatic control; 3) Only with three-speed selector switch, manual control. 4) Stepless speed regulation control of fan. According to the requirements of energy-saving standards, electric temperature control valve and three-speed combination control mode should be adopted. 9. When selecting products, attention should be paid to three problems: noise, condensation and the quality of the motor. This is the current sampling, there are more quality problems of the project. 10. The marking methods of fan coil units at home and abroad are different, so attention should be paid to the design and selection of fan coil units.

　　When the fan coil air volume is fixed, the water supply temperature is fixed, and the water supply quantity changes, the refrigeration capacity changes with the change of the water supply quantity. According to the performance statistics of some fan coil products, when the water supply temperature is 7℃ and the water supply quantity is reduced to 80%, the refrigeration capacity is about 92% of the original, indicating that the influence on the refrigeration capacity is relatively slow when the water supply quantity changes.
　　Fan coil supply, return water temperature is fixed, water supply temperature increases, cooling capacity decreases, according to statistics, water supply temperature increases by 1℃, cooling capacity decreases by about 10%, the higher the water supply temperature, the greater the reduction, dehumidification capacity decreases.
　　When the water supply condition is fixed and the air volume of fan coil changes, the refrigeration capacity and enthalpy difference of air treatment change with it. Generally, the refrigeration capacity decreases, the enthalpy difference increases, and the power consumption of fan per unit refrigeration capacity changes little.
　　When the temperature difference between inlet and outlet of fan coil increases, the water quantity decreases, and the heat transfer coefficient of heat exchange coil decreases. In addition, the heat transfer temperature difference has also changed, so the cooling capacity of the fan coil decreases with the increase of the temperature difference between supply and return water. According to statistics, when the water supply temperature is 7℃, the temperature difference between supply and return water increases from 5℃ to 7℃, the cooling capacity can be reduced by about 17%.
　　Thermal environment condition refers to the comprehensive effect of physical parameters on thermal comfort of human body. These physical parameters mainly include air dry bulb temperature, air relative humidity, air flow velocity, average radiation temperature, human metabolism and clothing. Among them, air temperature and flow velocity are important parameters to evaluate the thermal comfort conditions provided by fan coils.
　　The history, present situation and development of fan coil unit in China has experienced several different change processes. At the beginning, the understanding of fan coil units stayed on the basis of mainly meeting the air volume requirements. It is considered that as long as the air volume is large, it meets the requirements and is a good fan coil. Under the guidance of this concept, the main characteristics of the fan coil unit produced at that time were that the air volume generally exceeded the standard, and the noise of the unit was large, and the energy consumption was large. The unit power refrigeration capacity of the fan coil unit produced at that time was only about 40W. Because of the noise, the situation was that people had to endure annoying noise while enjoying the cold air brought by the air conditioner.
　　In order to solve the above problems, the state began to modify the fan coil unit product standards. In recent years, China's fan coil manufacturing industry has developed rapidly, the annual output has increased from thousands of units in the early 1980s to hundreds of thousands of units at present, but the product performance has been hovering at the level of foreign countries for a long time. The prospects for rapid growth at this low level are not optimistic. In the mid-1980s, foreign fan coil manufacturers represented by American Trane, York, Carrier and other companies have successively completed the upgrading of products, fan coil selection sample central air conditioning end fan plate parameter configuration replacement core radiator and launched a generation of new products. At that time, China's air-conditioning industry was intoxicated with the fact that domestic fan coils were close to foreign products in isolated parameters such as cooling capacity and noise, while ignoring the real gap in comprehensive performance and use effect, so that this product upgrade failed to cause any response in China's air-conditioning industry. In fact, the new generation of foreign fan coils in terms of performance, variety and air conditioning are ahead of our products.
　　Application status of fan coil unit: Because fan coil system has the advantages of easy regulation, easy installation and low cost, its application field is constantly expanding, and the product type is also increasing. When the traditional large-scale centralized air conditioning and split-type household air conditioning can not meet the requirements of modern civilization for the level of residential environment and residential management, the concept of fan-coil selection sample central air conditioning terminal fan plate parameter configuration replacement core radiator household central air conditioning came into being, fan-coil units played an indispensable role in it. For example: Air-cooled cold and hot water unit and fan coil combination (such as Teling), air-cooled cold and hot water unit and fan coil and floor heating combination (such as Qinghua Solan), water (ground) source heat pump unit and fan coil combination, air-cooled cold water unit and household boiler and fan coil combination (such as York), etc., fan coil selection sample central air conditioning terminal fan plate parameter configuration replacement core radiator Household central air conditioning in China is a new concept that has appeared in recent years. But it has been used in the United States for nearly half a century. At present, household central air-conditioning is becoming a condition for China's real estate developers to upgrade their buildings and improve their living quality.