Both the centralized processing and distribution of fresh air, and can be located in the air-conditioned room end device (such as fan coil) for indoor circulating air for local processing, both the characteristics of the first two systems called semi-centralized system.
control mode.
Simple control.
Use the three-speed switch to manually control the three-speed conversion and start-stop of the fan directly.
Temperature control.
STC series thermostats automatically control the opening and closing of STV series electric two/three-way valves according to the comparison and calculation between the set temperature and the actual detected temperature, and directly control the three-speed conversion and start and stop of the fan, thus achieving the purpose of constant temperature by controlling the water flow or air volume of the system.
Common styles.
Horizontal concealed installation (with return air box) fan coil.
Horizontal open-mounted fan coil.
Vertical concealed fan coil.
Vertical open-mounted fan coil.
Cassette two air outlet fan coil.
Card type four air fan coil.
Wall mounted fan coil.
Cabinet fan coil (commonly known as: fan coil water temperature air conditioning).
According to the form: horizontal concealed installation, horizontal open installation, vertical concealed installation, vertical open installation, card type five.
According to the thickness: ultra-thin, ordinary type.
Press with or without condensate pump: ordinary type, luxury type.
According to the static pressure of the unit: 0Pa,12Pa,30Pa,50Pa,(external static pressure).
According to the number of rows of pipes: two rows of pipes and three rows of pipes.
According to the standard: two controls, four controls.
The rows mentioned by the fan coil refer to the number of rows of copper tubes of the fan coil surface cooler. Generally, the second row is two rows of copper tubes, with 8 tubes in each row, totaling 16 copper tubes. The third row is three rows of copper tubes, with 8 tubes in each row, totaling 24 copper tubes. The more copper tubes, the better the cooling effect.
Two controls:.
Ordinary fan coil unit cold water cooling in summer and hot water heating in winter.
Four controls:.
It is mostly used in some luxurious places, where hot and cold water can be taken at the same time, that is, some rooms can be cooled according to needs and some rooms can be heated by fan coils.
The effect of parameter changes on performance.
When the temperature difference between the inlet and outlet of the fan coil increases, the amount of water decreases, the heat transfer coefficient of the heat exchange coil decreases, and the heat transfer temperature difference also changes. Therefore, the cooling capacity of the fan coil decreases with the increase of the temperature difference between the supply and return water. According to statistics, when the temperature difference between the supply and return water increases from 7 ℃ to 7 ℃, the cooling capacity can be reduced by about 17%.
The quality of the fan coil.
The amount of cold (heat) is guaranteed.
The guarantee of air supply.
Numerical ratio of noise.
No leakage of condensate.
Reasonableness of electrical design.
Reasonableness of sheet metal design.
How to identify the pros and cons of fan coil.
Listen to the noise-high frequency can go, low frequency is difficult to eliminate.
Look at the workmanship-burrs, gaps, manuals, warranties.
Compare the materials used in motors, fans, water trays and coils.
The motor is the core component of the unit Changzhou the best.
Fan: the source of noise.
Fan coil.
Water tray, insulation: the cause of dripping.
Coil: Hydrophilic aluminum best (blue).
1. Problem: The horizontal concealed fan coil in hotel rooms often flows down from the ceiling in summer.
Reason: The condensate pipe of the fan coil unit is discharged centrally. As a result, the space on the top cannot meet the requirements of the gradient of the condensate pipe, resulting in no slope or even reverse slope, so that the water in the drip tray cannot be discharged and overflows to the suspended ceiling after being full.
Solution:.
In order to reduce the damage to the suspended ceiling and rework cost, the drain pipe of the condensate tray is connected to the floor drain of the toilet, that is, the connection method of the condensate pipe is changed from centralized drainage to the connection method of discharging to the toilet.
2. Problem: The hotel lobby adopts horizontal concealed fan coil, and the condensate cannot be discharged.
Reason: limited by civil engineering conditions, the condensate pipe of the fan coil is not graded.
Solution: The building was renovated and the condensate pipe was sloped with I = 0.01 or more to solve the problem.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures