The method involves sweeping a heat exchanger (14) by a heat source (16) to heat working liquid. The hot fluid is expanded by an expansion unit (22). A cooling exchanger (26) is swept by cooling fluid (28) i.e. water, for cooling the working fluid. The wor...

A holster (21) for a handheld electronic device. The holster (21) has integrated therein one or more piezoelectric elements (26) that provide an output voltage to the handheld electronic device upon insertion of device in the holster (21). The output volta...