This article focuses on heat exchangers, exploring types of heat exchanger and explaining their respective functions and mechanisms.
We are Lando, one of the leading manufacturers any kinds of heat exchangers in China, such as Fin Heat Exchanger, Plate Heat Exchanger, Shell and Tube Heat Exchanger, Casing Heat exchanger. The heat transferring process can be gas-to-gas, liquid-to-gas, or liquid-to-liquid and occur through a solid separator, which prevents mixing of the fluids, or direct fluid contact and other types for special needs of all sizes and capacities.
Types of heat exchanger:
1. Fin Heat Exchanger
2. Plate Heat Exchanger
3. Shell and Tube Heat Exchanger
4.Casing Heat exchanger
Types of heat exchanger systems:
2.Air / cold water system
3.Water / Air Cooling System
4.Water Cooling / cold water system
3 kinds of Classification of heat exchanger:
A: Type of heat exchanger structure:
1.Fin-and-tube type (refrigerant / air, refrigerant carrier / air)
2.Shell and tube type (refrigerant/carrier)
3.Casing type (refrigerant / carrier)
4.Panel (refrigerant / carrier)
5. Cooling Tower (water / Air)
B: Heat transfer medium form：
1.Refrigerants / air-finned tube type
2.Refrigerants / (shell-and-tube / casing / Plate)
3.Water / Air (Cooling Tower)
C: Heat exchangers are classified by function
The structure and characteristics of condenser:
1 Air-cooled Condenser
Air and R22 are often counter-current, compared with water-cooled condenser, the efficiency is lower, used in small and medium-sized units.
2.Horizontal shell-and-tube Condenser
The end cover has a baffle to divide the heat exchanger tubes into even-numbered ones. The refrigerant travels through the Shell, i. e. , R22 condenses outside the tube, the upper intake, and the lower exhaust. Cooling water is piped in and out. Water flows backward with R22. High Heat Transfer Coefficient (compared with Air Cooling) , less cooling water consumption (compared with vertical), widely used.
Large-diameter seamless steel tubes with one or more copper tubes inside, and bent into spiral, copper tubes commonly used low-rib tubes. The refrigerant goes up and down the outer casing, and the cooling water goes up and down the inner casing. The reverse flow of water and refrigerant is commonly used in water-cooled chillers. The manufacturing process is simpler and the cost is lower than the shell-and-tube type.
4. Plate condenser
The sheet is made of stainless steel sheet, the refrigerant and cooling water flow between the sheets, full contact and high heat transfer efficiency. The plate heat exchanger only needs 1 / 2 ~ 1 / 4 of the shell-and-tube heat exchanger area to achieve the same heat transfer effect.
The evaporator structure and characteristics:
Refrigerants are often in and out, air and refrigerant 2 are often counter-current, low efficiency (compared with horizontal shell-and-tube type) , widely used in small and medium-sized units.
2. Shell and Tube evaporator
The refrigerant goes through the shell, that is, the refrigerant vaporizes outside the tube, the lower part enters the liquid, exhausts from the upper part; the liquid fills the cylinder body space 70 ~ 80%. The refrigerant keeps boiling in the evaporator and the heat transfer surface is in contact with the liquid refrigerant, so the boiling heat release Coefficient is large and the structure is compact.
Refrigerant charge amount is large. because refrigerant charge amount is large, so refrigerant and lubricating oil when melting, lubricating oil is difficult to return to the compressor, easy to freeze.
Plate evaporator, the plate by the stainless steel sheet stamping molding, between the use of welding connection, refrigerant and cooling water flow in the gap between the sheets, full contact, high heat transfer efficiency, the manufacturing process is more complex, high price.
4. What is the difference between the evaporative condenser and cooling tower?
Evaporative condenser and cooling tower are still different from the condenser, here we listed separately briefly.
What is the Evaporative condenser?
Evaporative condenser is a kind of equipment which uses the spray water outside the coil to evaporate and absorb the heat of the high-temperature gaseous refrigerant in the coil. so that the refrigerant in the tube is cooled gradually from gaseous state to liquid.condensation effect is good, water-saving, energy-saving, but scaling on its heat transfer performance is very big, easy to corrosion, on the fan blades higher requirements, larger noise.
What is the Cooling Tower?
Cooling Tower is a kind of equipment for heat exchange between water and air. It is mainly composed of the fan, motor, packing, seeding system, tower body, water tray, etc. The heat exchange is mainly carried out by comparing the low- temperature air and the water in the packing under the action of the fan to exchange the heat and reduce the water temperature.
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