In Big Discount Hot Air Circulating Drying Oven Good Quality for Fruit and Vegetable

I. Working Principle:

A hot air circulation oven is a chamber-type batch drying equipment that primarily relies on forced convection of heated air to heat and dehumidify materials. During operation, heating elements warm the air, which is then circulated by a fan through ducts into the working chamber, creating continuous and uniform airflow throughout the chamber. As the hot air passes over or through the material layer, it transfers heat to the material and carries away evaporated moisture or solvent. A portion of the moist, hot air is discharged through exhaust vents, while an equal volume of fresh air is introduced and mixed with the recirculating hot air, which is reheated before being reused. This cycle repeats continuously, maintaining stable chamber temperature and steadily reducing the material's moisture content.

II. Disadvantage:

The main drawbacks of this equipment include: the drying process is typically intermittent, requiring time for loading/unloading and batch transitions, resulting in relatively low continuous operation capability; improper design of internal airflow distribution may lead to localized low air velocity or dead zones, reducing drying uniformity; insufficiently precise moisture exhaust control can result in heat loss or humidity fluctuations; dust or particulate buildup within the recirculation ducts poses a risk of cross-contamination between batches; heating elements, fans, ducts, and seals require regular maintenance, leading to non-negligible maintenance costs; additionally, energy consumption occurs during heating, cooling, and insulation phases, and overall thermal efficiency is significantly affected by insulation performance, exhaust method, and airflow matching.