Abstract: A refrigeration cycle includes a compressor, a refrigerant radiator, first and second expansion valves configured to decompress refrigerant flowing out of the refrigerant radiator, a first evaporator configured to evaporate the refrigerant flowing out of the first expansion valve, and a second evaporator configured to evaporate the refrigerant flowing out of the second expansion valve. A heat medium circuit includes a heat exchange portion and circulates a heat medium while flowing through the heat exchange portion and the second evaporator. The first evaporator exchanges heat between the refrigerant and ventilation air blown to a space to be air conditioned, and the second evaporator exchanges heat between the heat medium and the refrigerant to evaporate the refrigerant and cool the heat medium. The heat exchange portion is made to cool the temperature regulation target.

Abstract: The invention is applicable to a developing device with a toner hopper as toner container, which can be mounted and dismounted and includes a toner replenishment roller controlled for rotation according to a detection signal of a toner concentration sensor. A shutter capable of being rotated along the outer periphery of the toner replenishment roller, is provided for opening and closing an opening at predetermined angular positions. At least one shutter opening end is in frictional contact with roller periphery, thus permitting stable mounting and dismounting of the toner container with respect to a developer container in a simple operation.Further, in a toner container comprising a replenishment toner accommodating section and a waste toner recovery section formed at a longitudinal end of the accommodating section via a partitioning wall, the volume ratio between the replenishment toner accommodating section and the waste toner recovery section is set such that no overflow of waste toner occurs.