What are the factors that affect the cleaning effect of beer fermentation tanks?

The cleaning performance of beer fermentation tanks is influenced by several key factors:

1. **Surface Roughness**: The rougher the metal surface, the stronger the adhesion between dirt and the surface, making cleaning more challenging. Food production equipment typically requires a surface roughness (Ra) of less than 1 micrometer.

2. **Dirt Properties**: Old, dried-on dirt is harder to remove than fresh dirt. Prompt cleaning after each production cycle is essential to maintain cleaning effectiveness.

3. **Flushing Intensity**: Proper control of flushing intensity and flow rate ensures the cleaning liquid remains turbulent, effectively wetting the equipment surface for optimal results.

4. **Cleaning Agent Effectiveness**: The type (acid or base), activity, and concentration of the cleaning agent significantly impact its performance.

5. **Temperature**: Cleaning effectiveness generally increases with temperature. For instance, cleaning at 50°C for 5 minutes can be as effective as cleaning at 20°C for 30 minutes, depending on the cleaning agent and conditions.

These factors collectively determine how effectively beer fermentation tanks can be cleaned to ensure optimal performance and taste quality.