Evaporator

Bare tube evaporators
Copper tubing or steel pipes comprise the bare tube evaporators. Small evaporators use copper tubing with non-ammonia refrigerants, while large ammonia-based ones employ steel pipes; bare tube evaporators feature multiple tubing rounds, commonly flat, zigzag, or oval trombone shapes. Bare tube evaporators commonly perform liquid cooling. During blast cooling and freezing processes, ambient air passes over the bare tube evaporator, and the chilled air leaves it for cooling purposes. Bare tube evaporators services are employed in a limited number of applications, while finned evaporators, which are bare tube evaporators with fins, are widely utilized.

Plate type evaporators
Insert the coil, typically made of copper or aluminum, into the plate to create a smooth appearance on the surface of plate evaporators. The plate evaporator seems to be a single plate from the outside, but inside it has multiple turns of metal tubing through which the refrigerant flows. Plate evaporators have the benefit of being more robust due to the exterior plate providing a lot of safety. Additionally, the exterior plate aids in boosting heat transmission from the metal tube to the chilled material. In addition, plate evaporators are simple to clean and can be produced inexpensively.

Finned evaporators
Fins coat bare tube evaporators, turning them into finned evaporators. In a bare tube types of evaporators the chilled fluid loses much of the refrigerant’s chilling action due to reduced surface area. Because the fluid tends to travel through the tubing’s open gaps and does not come into contact with the coil’s surface, bare tube evaporators are less effective. Fins on bare tube evaporators boost heat transfer by increasing contact surface, making them more effective than bare tube counterparts.

Tube or shell type evaporators
Large refrigeration and central air conditioning systems use shell and tube type evaporators. Evaporators, or chillers, have tube configurations in drums or shells and fall into dry expansion or flooded categories. The float valve, which also serves as an expansion valve in these chillers, keeps the refrigerant level constant.

Steam heated
Steam Heated Evaporators are preferred when low pressure steam is available and inexpensive. The steam is condensed on the shell side of the evaporator, which operates at a higher pressure than on the tube side and drives evaporation. The evaporation from the first effect is used as the heating source for the subsequent effect. The vapors produced in the last effect are condensed in a condenser. Steam cost, overall available temperature differential, space requirements and product characteristics are considered to optimize the number of effects.

Mechanical vapor recompression
The evaporator components are like steam driven systems, but with the addition of a mechanical compressor or fan. Mechanical energy compresses evaporated process vapor to a higher pressure and condensing temperature, and returns it to the process, minimizing steam consumption.

With increased gas prices, MVR has become the popular option for reducing operating costs, especially at higher evaporation rates. Fewer vessels are required than in steam powered multiple effect systems, resulting in lower installation costs.

Thermal vapor recompression
Thermal Vapor Recompression (TVR) system is more energy efficient than a steam heated system when medium to high pressure steam is available. The motive steam enters through the nozzles and draws in recycled suction vapor. The vapor mixes in the converging section, and the recycled vapor is boosted to an intermediate pressure. Recycling the suction vapor allows for a lower steam consumption. Thermocompressors are more efficient when they are recycling more vapour, producing a lower boost and therefore requiring less steam.

Waste energy
As part of the movement for sustainable future, increased efforts have been made in finding ways to reuse energy from other parts of the plants. Dedert has long been a pioneer in waste heat recovery and was granted the US patent for an evaporator chest with built-in scrubber for the corn wet milling industry.

The company has a registered capital of RMB 80 million and a production base area of ​​35,000 square meters., and a high-tech and well-trained team of more than 260 employees, including 80 engineering and technical personnel (5 senior engineers and 50 professionals with junior and intermediate titles) and more than 100 certified welders. These employees have the extensive experience in the manufacturing and installation of pressure vessels and the on-site manufacturing of large equipment. In addition to the high-quality production supporting equipment, the company has the advanced and perfect inspection and testing equipment, pressure leakage test equipment, physical and chemical equipment, welding laboratory and so on.