Hot gas generator and drying or dehydration facility implementing such a generator

A dehydration or drying facility comprising:

• at least one hot gas generator for a dehydration or drying unit, the generator further comprising:
• a burner or a heating appliance,
• at least one exchange circuit incorporating at least two manifolds in which gas circulates that is to be heated,
• each of said manifolds comprising:
• one intake end for cool gas,
• one exhaust outlet end for the hot gas,
• a thermal exchange surface for combustive gases generated by said burner or heating appliance and the gas to be heated circulating in the manifold, and
• a physical separation between the gas to be heated and the combustive gases generated by said burner or heating appliance;
• a recovery circuit incorporating at least one condenser that dehydrates the hot gas;
• an enclosure that receives matter or materials to be dehydrated;
• and
• a mixer positioned upstream of said enclosure and enabling said hot gas from said generator to be mixed with cool gas from said condenser,
• wherein the intake end for cool gas is linked to the recovery circuit to recover said hot gas which is extracted from the enclosure.