Heat pump drying of cherry tomatoes is usually divided into four stages. The drying time is about 32 hours and the temperature is between 50°C and 65°C. The specific process is as follows:
1.In the low-temperature dryingstage, the temperature is 50°C, the humidity is 30%, and the time is about 6 hours. The temperature in this stage should not be too high, otherwise the sugar will be easily coked, resulting in blackening of the finished product.
2.In the drying and dehumidification stage, the temperature is set to about 55°C, the humidity is 25%, and thedryingtime is about 12 hours.
3.In the setting and color setting stage, the temperature is 60°C, the humidity is 20%, and the time is about 10 hours.
4.In the saccharification and shelling stage, the temperature is set higher in this stage, generally around 65°C, the humidity is 15%, and the drying time is 4 hours.