Abstract: An apparatus for dehumidifying ambient atmospheric air includes a first air path and a second air path. A heat exchanger system transfers at least a portion of radiated thermal energy to air drawn along the first air path to heat the air in the first air path and transfers at least a portion of the thermal energy from exhaust gas to air drawn along the first air path to heat the air in the first air path. The first air path connects the ambient atmosphere to a reactivation air outlet through the heat exchanger system and a desiccant in a second moisturized state, and the second air path connects the ambient atmosphere to a dried air outlet through the desiccant in a first dried state.

Abstract: Measuring moisture content of a material under test. First and second sense voltages across a sense resistor are detected in response to application of respective first and second supply voltages across the sense resistor and the material under test. The material under test is electrically coupled to the sense resistor. A net sense voltage is determined by determining a difference between the second and first sense voltages. A resistance of the material under test is determined based on the net sense voltage, a predetermined resistance of the sense resistor, and the second supply voltage. A moisture content of the material under test is determined based on the resistance of the material under test.