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The classic and practical fan coil introduction knowledge, you are worth collecting!

The classic and practical fan coil introduction knowledge, you are worth collecting!

  • Categories:Industry News
  • Author:
  • Origin:制冷百科
  • Time of issue:2020-03-13
  • Views:767

(Summary description)

The classic and practical fan coil introduction knowledge, you are worth collecting!

(Summary description)

  • Categories:Industry News
  • Author:
  • Origin:制冷百科
  • Time of issue:2020-03-13
  • Views:767
Information
1. Brief introduction and characteristics of fan coil unit:
Fan coils are ideal end products for central air conditioning. Fan coils are widely used in hotels, office buildings, hospitals, commercial and residential, scientific research institutions and other places. Its working principle is that the fan cools or heats indoor air or outdoor mixed air through a surface cooler and sends it into the room, so that the indoor temperature is lowered or raised to meet people's comfort requirements.
 

 

Main advantage:
Small size; high efficiency; low noise; low energy consumption. The body structure is exquisite, compact, sturdy and durable. The coil tube is made of high-quality galvanized sheet casing. The condensate water pan is integrally formed by a molding process. There are no welds, solder joints, and fire-proof insulation materials that are integrally connected to the water pan.
 

 

Main disadvantages:
Since this method is only based on convection heat exchange, which makes the indoors less than the best comfort level, it is only suitable for places where people stay for a short time, such as offices and hotels, and not for ordinary residences. Due to the addition of fans, the construction cost and operating cost are increased, and the maintenance and management of the equipment are also more complicated.
 

 

2. Working principle and common styles:
Relying on the forced action of the fan, the air passes through the coil, and the air in the room is continuously recirculated in the unit, so that the air is cooled (heated) after passing through the cold water (hot water) coil to keep the room temperature constant.
 

 

Common styles:

  • Horizontal concealed (with return air box) fan coil unit;

  • Horizontal surface mounted fan coil unit;

  • Vertical concealed fan coil unit;

  • Vertical surface mounted fan coil unit;

  • Cassette two-outlet fan coil unit;

  • Cassette four-outlet fan coil unit;

  • Wall-mounted fan coil unit;

  • Cabinet type fan coil unit.

 

 

According to the form:
There are five types: horizontal concealed installation, horizontal exposed installation, vertical concealed installation, vertical exposed installation, and cassette type.
 

 

According to thickness:
Ultra-thin, ordinary type.
 

 

According to the presence or absence of a condensate pump:
Ordinary type, luxurious type.
 

 

 

 

According to the static pressure of the unit:
0Pa, 12Pa, 30Pa, 50Pa, 80Pa (external static pressure).
 

 

According to the number of pipes:
Two rows of tubes, three rows of tubes.
 

 

By standard:
Two controls, four controls.
 

 

Two rows of tubes, three rows of tubes:
Second row: There are two rows of copper pipes, each row of 8 pieces, a total of 16 copper pipes.
Three rows: There are three rows of copper pipes, each row has 8 copper pipes, a total of 24 copper pipes.
The rows of fan coils refer to the number of copper pipes of the fan coil surface cooler. The more copper pipes there are, the better the cooling effect.
 

 

Two control, four control:
Two controls: ordinary fan coils use cold water for cooling in summer and hot water for heating in winter
Four control: mostly used in some more luxurious places, hot and cold water can be used at the same time, that is, some rooms can be cooled according to needs, and some rooms can be heated
 

 

control method:
Simple control: use the three-speed switch to directly manually control the three-speed conversion and start-stop of the fan
 

 

Temperature control: The thermostat automatically controls the opening and closing of the STV series electric two/three-way valve according to the comparison and calculation of the set temperature and the actual detected temperature; directly controls the three-speed conversion and start-stop of the fan, so as to control the water flow or The air volume achieves the purpose of constant temperature
 

 

3. The impact of parameter changes on performance:
 

 

1. The air volume of the fan coil unit is constant, the temperature of the water supply is constant, and when the water supply volume changes, the cooling capacity changes with the change of the water supply volume. [This article source: Refrigeration Encyclopedia Public Number], according to the performance statistics of some fan coil products, when the water supply temperature is At 7°C, when the water supply is reduced to 80%, the cooling capacity is about 92% of the original, indicating that when the water supply changes, the impact on the cooling capacity is relatively slow.

 

 

 

2. The temperature difference between the supply and return water of the fan coil unit is constant. When the temperature of the water supply increases, the cooling capacity decreases. According to statistics, when the temperature of the water supply rises by 1℃, the cooling capacity decreases by about 10%. The higher the water supply temperature, the greater the reduction. Large, the dehumidification capacity decreases.
 

 

3. When the water supply condition is constant, when the air volume of the fan coil is changed, the cooling capacity and the air handling enthalpy difference will change. Generally, the cooling capacity decreases and the enthalpy difference increases, and the power consumption of the fan per unit cooling capacity does not change much.
 

 

4. When the temperature difference between the inlet and outlet of the fan coil increases, the water volume decreases, and the heat transfer coefficient of the heat exchange coil decreases. In addition, the heat transfer temperature difference has also changed. Therefore, [this article source: Refrigeration Encyclopedia Public Number], the cooling capacity of the fan coil decreases with the increase in the temperature difference between the supply and return water. According to statistics, when the water supply temperature is 7°C, the supply and When the return water temperature difference is increased from 5℃ to 7℃, the cooling capacity can be reduced by about 17%.

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