Abstract: A method for operating a shaft furnace is performed by charging different ore/coke ratio mixture in radially different positions in the furnace. The ore/coke mixture ratio may be determined according to desired heat distribution in radial direction. For this, at least two mutually independently determined ore/coke mixture ratio mixtures are provided in each charge cycle of the burden. The mixture to be charged in the central portion of the furnace may have a higher coke content or a lower ore content for better permeability to the heating gas.

Abstract: An air conditioner has a refrigeration system comprising by a compressor, a reversing valve, an indoor heat exchanger, an expansion device and an outdoor heat exchanger which are connected in series to form a closed system, a bypass pipe equiped with a two-way valve, connected in parallel with the outdoor heat exchanger between the delivery side of the compressor and the refrigerant inlet side of the outdoor heat exchanger. An outdoor blower is provided for the outdoor heat exchanger. The two-way valve is adapted to permit hot refrigerant gas delivered by the compressor to be recirculated through the outdoor heat exchanger thereby effecting defrosting of the outdoor heat exchanger.

Abstract: An air conditioner including a room temperature detector, a room temperature adjuster and a controller is disclosed which is provided with a photodetector, and in which the temperature set in the room temperature adjuster is changed on the basis of the illuminance detected by the photodetector, and a signal for controlling a compressor is generated by the controller in accordance with the temperature thus changed.