Abstract: A grain drying system and process includes a controller that is electronically coupled to a variable speed fan and to a heater or a heat pump to supply air through a plenum and the grain. Also coupled to the controller are ambient temperature and humidity sensors, internal plenum temperature and a humidity sensor. The controller adjusts a fan speed in combination with operating the heater or heat pump to deliver a target equilibrium moisture temperature, during a first period when the ambient air is outside the equilibrium moisture target. The controller operates the fan at a minimum speed, during a second period when the ambient air is outside the equilibrium moisture target, and the controller is unable to obtain equilibrium moisture target air in the plenum in view of operational limits of the fan and the heater or heat pump.

Abstract: A control system for a spark-ignited gaseous fuel engine includes a fuel quality sensing mechanism, and a control device structured to receive data produced by the fuel quality sensing mechanism indicative of a change in energy content of a stream of gaseous fuel and air, and to vary an amount of an augmenting fuel that is injected into the stream of gaseous fuel and air based on the data. The strategy has application to low energy gaseous fuel and air mixtures such as are produced in mine ventilation.

Abstract: A control system for a spark-ignited gaseous fuel engine includes a fuel quality sensing mechanism, and a control device structured to receive data produced by the fuel quality sensing mechanism indicative of a change in energy content of a stream of gaseous fuel and air, and to vary an amount of an augmenting fuel that is injected into the stream of gaseous fuel and air based on the data. The strategy has application to low energy gaseous fuel and air mixtures such as are produced in mine ventilation.

Abstract: A grain drying system and process includes a controller that is electronically coupled to a variable speed fan and to a heater or a heat pump to supply air through a plenum and the grain. Also coupled to the controller are ambient temperature and humidity sensors, internal plenum temperature and a humidity sensor. The controller adjusts a fan speed in combination with operating the heater or heat pump to deliver a target equilibrium moisture temperature, during a first period when the ambient air is outside the equilibrium moisture target. The controller operates the fan at a minimum speed, during a second period when the ambient air is outside the equilibrium moisture target, and the controller is unable to obtain equilibrium moisture target air in the plenum in view of operational limits of the fan and the heater or heat pump.