Dual-power portable-use hair dryer

A dual-power portable-use hair dryer comprising:

• (i) a pack cover having at least one strap, an insulated standoff member extending along substantially entire height of a portion of the pack cover and secured to an exterior surface of the pack cover to prevent heat transfer to a user, and a pack vent;
• (ii) an air handler unit comprising:
• (a) an air intake;
• (b) an intake hood covering said air intake, adapted to draw pre-heated air from within said pack cover;
• (c) a heater mounted downstream of the air intake and adapted to heat air;
• and
• (d) a fan unit adapted to expel heated air;
• (iii) a flexible air hose attached to said air handler unit and adapted to receive heated air expelled from said air handler unit and convey heated air to a hair-drying attachment;
• (iv) an inflow sensor mounted in said pack cover near said air intake and upstream of the heater, said inflow sensor being adapted to sense the temperature of inflowing air;
• (v) an outflow sensor mounted in said pack cover downstream of the inflow sensor and the fan unit, near the place of attachment of said flexible air hose to said air handler unit, adapted to sense the temperature and the pressure of outflowing air before delivery to the hair-drying attachment;
• (vi) a battery array adapted to supply DC power;
• (vii) an AC-to-DC power unit adapted to convert AC mains power into DC power, and to communicate operational data;
• (viii) a user control adapted to receive commands from a user;
• and
• (ix) a controller unit adapted to control the charging and discharging of said battery array, adapted to receive data from said user control and said inflow sensor, outflow sensor, and AC-to-DC power unit, and to control operation of said heater and said fan unit, said AC-to-DC power unit and said battery array being separately operationally connected to said controller unit and being configured to receive separate operational signals from the controller unit in response to user's choice of which power source to use when drying hair, and wherein the inflow sensor is configured to sense the incoming air temperature and to communicate to the controller unit for determination of how much heat, if any, should be applied by the heater in order to achieve the temperature set by the user through the user control.