Desiccant based cabin windshield defog/defrost system

An apparatus for defrosting and defogging the interior portion of a windshield with an impinging air stream, where the windshield surface to be defrosted or defogged is contained within the cabin compartment of a motorized vehicle capable of producing heat during operation, the apparatus comprising:

• a desiccant wheel for dehumidification of the impinging air stream, wherein the wheel has a desiccant substance applied to its surface or integral to the substance used to form the wheel;
• drive means for rotating the desiccant wheel;
• heat exchanger for extracting heat from the motorized vehicle;
• a case having an interior to house the desiccant wheel, wherein the case has a hot chamber and a cabin chamber;
• first fan means for drawing air from a cabin compartment of a motorized vehicle and directing the drawn air to the interior of the cabin chamber of the case and back to the cabin of the motorized vehicle;
• second fan means for directing an air stream to the heat exchanger and the hot chamber;
• baffle air valve for directing dehumidified air through an alternate duct directly to the air-conditioning intake coils;
• wherein the desiccant wheel rotates in response to the drive means within the hot and cabin chamber of the case to enable the desiccant wheel in combination with the desiccant substance applied hereto to collect moisture from the air delivered to the cabin chamber by the first fan means and allows the second fan means to evaporate the moisture collected by the desiccant wheel;
• and
• exhaust means for expelling air from the hot chamber of the case.