There are many types of refrigerated dryers on the market, and compressed air refrigerated dryers are one of them. Their main function is to compress air and remove moisture from the air. Nowadays, they are often used in industries such as chemical, electronics, and medicine. So, what is the working principle of a compressed air refrigerated dryer? What are the characteristics of compressed air refrigerated dryers? Next, let's have a detailed understanding of the working mechanism and characteristics of compressed air refrigerated dryers.

Many people think that the term refrigerated dryer is a neutral term, which refers to the difference between cold and dry. In fact, compressed air refrigerated dryers use refrigerant and compressed air for heat exchange, reducing the temperature of compressed air to a dew point temperature range of 2-10 ℃, making the water content in compressed air tend to be supersaturated, thereby removing the water in compressed air. So what are the working principles and characteristics of compressed air refrigerated dryers? Below is a specific analysis of its main points:

1. Temperature

Temperature: It represents the statistically uniform value of molecular thermal motion. Temperature: The temperature starting from the extreme temperature at which a gas stops moving, denoted as T. The unit symbol is K (Kelvin) Celsius temperature: the temperature starting from the melting point of ice, measured in Celsius. The West is represented by Fahrenheit temperature, with the unit symbol F. The conversion relationship between temperature units is: T (K)=t (℃)+273.16t (F)=1.8t (℃)+32

2. The meanings of atmospheric pressure, pressure, and gauge pressure

Atmospheric pressure: refers to the pressure exerted by the Earth's surface atmosphere on objects on the Earth's surface, known as atmospheric pressure. The symbol is B, and the unit is Pa or Mpa

Pressure: The pressure directly acting on the surface of a container or object is called "pressure", with the symbol PABS.

Gauge pressure: The pressure measured by instruments such as pressure gauges, vacuum gauges, and U-tubes is called "gauge pressure". The gauge pressure is based on atmospheric pressure, with the symbol Pg.

The relationship between the three: PABS=B+Pg1 scale atmospheric pressure=0.01013Mpa 1Kg/cm2=14.2235Psi (pounds per square inch).

3. What is the pressure dew point of a refrigerated dryer?

After humid air is compressed, the density of water vapor increases and the temperature also rises. When compressed air is cooled, the relative humidity increases. When the temperature continues to decrease until the relative humidity reaches, water droplets precipitate from the compressed air, and this temperature is the pressure dew point temperature of the compressed air.

4. What is the scale state of air?

The air state at a temperature of 20 ℃ and a relative temperature of 65% is called the scale state of air. In the scale state, the air density is 1.2kg/m3 (the processing capacity of post-treatment equipment such as air compressors, dryers, and filters are all marked by the flow rate in the air scale state, with the unit recorded as Nm3/min.).

5. Definition of Air Humidity

Temperature: The physical quantity that represents the degree of dryness and humidity in the air is called "humidity". The commonly used methods for expressing humidity include "relative humidity" and "humidity".

Humidity: The weight of moist air containing water vapor in a volume of 1m3 is called "humidity".

Relative humidity: The ratio of the actual amount of water vapor contained in humid air to the possible amount of water vapor at the same temperature is called "relative humidity".

There are many accessories in a refrigerated dryer, among which the refrigeration component is the main one. Today, we will briefly understand the capillary tube in a refrigerated dryer. First, let's look at the structure and principle of the capillary tube, and why it can cool down and reduce pressure. Personally, I feel that in refrigeration mode, the fluorine in the condenser will increase pressure when passing through the capillary tube due to the tube becoming thinner. However, the function of the capillary tube is to reduce pressure and lower temperature.

Can it be said that if the compressor is driven by a variable frequency motor (which can adjust the flow rate through speed regulation), there is no need for expansion valves and capillaries, and only a throttling tube (throttling pressure reduction) is needed.

The capillary tube is integrated with the expansion valve, and its function is to adjust the opening of the expansion valve through thermal expansion and contraction under different temperature states, so as to quickly cool it to the required air conditioning temperature. Air conditioning systems are generally divided into two types: one is the sub system, and the other is the European sub system, which uses the expansion valve.

How to understand the process of capillary principle analysis: After the refrigerant enters the capillary, the front section is the liquid phase section, and the rear door is the gas-liquid coexistence section. The front section changes linearly, while the saturation pressure in the rear section changes nonlinearly with the active direction (does this nonlinearity mean that the pressure decreases slower or faster?). As it reaches the end of the capillary, the pressure per unit length increases.

The difference in function between the two is not significant, but the expansion valve is controlled by a capillary tube for opening, while the throttle tube has a fixed opening flow rate. In European countries, the flow rate is controlled by a variable compressor, so the throttle tube does not require a capillary tube to control the opening size.

Firstly, we know that the compressor is continuously reducing the pressure at the end of the capillary and continuously improving the pressure in front of the capillary. The function of a capillary is to provide a steady small flow rate. The smaller its flow rate, the higher the pressure accumulated at the front end and the lower the pressure at the tail end. This creates a favorable condition for the rapid expansion of the gas-liquid mixture at the tail end. The result is that the gas-liquid mixture expands and absorbs heat outside the low-pressure capillary port, and the expanded gas quickly flows back to the low-pressure suction circuit of the compressor

Before operation, the column should be flushed with buffer solution. In fact, the column is already filled with buffer solution, forming a circuit.

From a physical principle, the adsorption force of water on the inner wall of the capillary tube of a freeze dryer is certain, but the thinner the capillary tube, the less significant the pressure effect on water absorption. Therefore, the thinner the capillary tube, the stronger its water absorption when perpendicular to the water surface.

The above introduction about the working principle and characteristics of compressed air refrigerated dryers and the working principle of compressed air refrigerated dryers is hoped to help you understand the working mechanism and characteristics of compressed air refrigerated dryers.