Generally, water-cooled refrigerated dryers primarily use fully enclosed compressors. This is because fully enclosed compressors have lower power and are relatively cheaper. Air-cooled refrigerated dryers generally use semi-enclosed compressors. When using semi-enclosed compressors in air-cooled refrigerated dryers, ammonia refrigeration compressors can also be considered because they have higher power and can be used for multiple purposes, but installation and management are more complicated.
Regarding the selection of evaporators in refrigerated dryers, high-temperature refrigerated dryers use air coolers as evaporators, characterized by rapid cooling, but prone to moisture loss in refrigerated goods. Medium and low-temperature refrigerated dryers primarily use evaporator coils made of seamless steel pipes, characterized by good temperature control and the ability to store cold as needed. Refrigerated dryers play a significant role in equipment, especially in today's industrial air compressor era, serving as excellent auxiliary equipment for post-processing air compressors, improving their efficiency and providing a better working environment and higher productivity.
When selecting compressors for refrigerated dryers, multiple factors need to be considered to ensure that their performance, efficiency, stability, and reliability meet actual requirements. Here are some key selection considerations:
1. Compressor Type
Commonly used compressor types in freeze dryers include reciprocating piston compressors, scroll compressors, rotary compressors, and screw compressors. Each type has its own characteristics:
Reciprocating Piston Compressors: Simple structure, but may have higher vibration and noise levels.
Scroll Compressors: High efficiency, low noise, stable operation, suitable for small to medium-sized freeze dryers.
Rotary Compressors: Small size, lightweight, suitable for applications with space constraints.
Screw Compressors: Suitable for large freeze dryers, stable operation, high efficiency, but relatively high cost.
2. Compressor Brand
The compressor brand is an important factor in the selection process. Well-known brands typically offer higher quality assurance, more stable performance, and longer service life. Choosing compressors from these brands can significantly reduce equipment failure rates and maintenance costs.
3. Cooling Effect and Stability
The cooling effect and stability of the compressor directly affect the performance of the freeze dryer. When selecting, it is necessary to pay attention to the compressor's cooling capacity, energy efficiency ratio, operational stability, and performance under different operating conditions.
4. Noise Control
Noise control is another crucial factor to consider when selecting a compressor. Especially in noise-sensitive environments such as laboratories and hospitals, choosing a low-noise compressor can create a more comfortable working environment.
5. Energy Consumption and Cost
The compressor's energy consumption directly impacts the freeze dryer's operating costs. When selecting a compressor, pay attention to its power, energy efficiency ratio (EER), and energy consumption under different operating conditions. Choose compressors with high EER and low energy consumption to reduce operating costs.
6. After-Sales Service
After-sales service is equally important. Choosing a compressor brand with a comprehensive after-sales service system ensures timely repair and support in case of equipment problems. Additionally, consider the compressor's warranty policy, repair cycle, and repair costs.
In conclusion, selecting a compressor for a freeze dryer requires comprehensive consideration of multiple factors, including compressor type, brand, cooling effect and stability, noise control, energy consumption and cost, and after-sales service. By comprehensively evaluating these factors, you can select the compressor that best suits your needs to ensure the performance and reliability of the freeze dryer.