1 heat exchanger type-fin type
2 heat exchanger template type
3 heat exchanger form-shell and tube type
3 heat exchanger form-sleeve type
Second, the type of heat exchanger system
1 air cooling/cold air system
2 air cooling/cold water system
3 Water cooling/cold air system
4 Water cooling/cold water system
Third, the classification of heat exchangers.
According to the structural form:
Finned tube type (refrigerant/air, coolant/air)
Shell and tube (refrigerant/coolant)
Sheath type (refrigerant/coolant)
Plate (refrigerant/coolant)
Cooling tower (water/air)
According to the form of heat exchange medium:
Refrigerant/air fin tube type
Refrigerant/coolant (shell and tube/sleeve/plate)
Water/air (cooling tower)
By function:
evaporator
capacitor
Terminal coil
cooling tower
Fourth, the structure and characteristics of the condenser
1 air cooled/air cooled condenser
Air and R22 are usually counter-current. Compared with water-cooled condenser, it has lower efficiency and is mostly used in small and medium-sized units.
2 horizontal shell-and-tube condenser
There is a baffle in the end cover to divide the heat exchange tube into several processes, most of which adopt even-numbered processes, so that the nozzles are on the same side. This article comes from the official account of WeChat hvacrbk, Refrigeration Encyclopedia. The refrigerant passes through the shell side, that is, R22 condenses outside the tube, the upper refrigerant enters and the lower refrigerant is discharged. Cooling water pipe channel; In and out. Water and R22 flow in countercurrent. The heat transfer coefficient is higher (compared with air cooling) and the amount of cooling water is less (compared with vertical cooling), so it is widely used.
Three-tube condenser
One or more copper tubes are sheathed in the large-diameter seamless steel tube and bent into a spiral shape. Low-ribbed tubes are commonly used in copper tubes. Refrigerant goes to the outer tube side, enters and exits, and cooling water goes to the inner tube; In and out. Water and refrigerant flow in opposite directions, often used in water coolers. The manufacturing process is relatively simple, and the cost is lower than that of shell-and-tube type.
Four-plate condenser
The plate is made of stainless steel sheet by stamping, and refrigerant and cooling water flow in the sheet at intervals, with sufficient contact and high heat exchange efficiency. Plate heat exchanger only needs 1/2 ~ 1/4 of the area of shell-and-tube heat exchanger to achieve the same heat exchange effect, but it has small resistance loss, small occupied area, complex manufacturing process, high price and easy blockage.
Verb (abbreviation of verb) Structure and characteristics of evaporator
1 finned evaporator
Refrigerant often goes in and out from the bottom, and air and refrigerant 2 often flow in the opposite direction, which has low efficiency (compared with horizontal shell and tube) and is widely used in small and medium-sized units.
2 shell-and-tube evaporator
The refrigerant passes through the shell side, that is, the refrigerant vaporizes outside the tube, and the liquid enters from the lower part and is discharged from the upper part; The liquid fills 70~80% of the cylinder space. The refrigerant has boiled in the evaporator, and the heat transfer surface is in contact with the liquid refrigerant, so the boiling heat release coefficient is large; Compact structure.
The refrigerant charge is large, because the refrigerant charge is large, when the refrigerant is mixed with the lubricating oil, it is difficult for the lubricating oil to return to the compressor; Easy to freeze.
Three-plate evaporator
Plate evaporator, the plate is stamped from stainless steel plate and connected by welding. Refrigerant and cooling water flow in the plate at intervals, with full contact, high heat exchange efficiency, complex manufacturing process and high price. This article comes from the official account of WeChat hvacrbk, Refrigeration Encyclopedia. Low water flow is easy to block and freeze.
Six, evaporative condenser and cooling tower
Evaporative condensers and cooling towers are still different from condensers. Here we list them separately and briefly explain them.
1 evaporative condenser
Evaporative condenser refrigeration is a kind of equipment that absorbs the heat of high-temperature gaseous refrigerant in the coil when the spray water outside the coil partially evaporates, so that the refrigerant in the coil is gradually cooled from gaseous to liquid. Evaporative condenser has a good condensation effect, saving water and energy, but scaling has a great influence on its heat transfer performance, which is easy to corrode, requires higher blades and makes greater noise.
2 cooling towers
Cooling tower is a kind of equipment for heat exchange between water and air, which is mainly composed of fan, motor, packing, water sowing system, tower body, water tray and so on. The heat exchange mainly means that under the action of the fan, the air with relatively low temperature exchanges heat with the water in the filler to reduce the water temperature.
Cooling towers are divided into natural ventilation cooling towers; Mechanical ventilation cooling tower; Mixed ventilation cooling tower; Different ventilation methods have different characteristics.
I believe that after the above introduction, everyone has a certain understanding of the role and characteristics of heat exchangers in refrigeration systems. Welcome to Zhong Da for more information.
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