Abstract: A laundry dryer has drum (1) which stores laundry; heat pump device including pipeline connecting compressor (16), which compresses refrigerant, radiator (17), pressure reducer (18), which reduces refrigerant after heat emission at radiator (17), and heat absorber (19), so that pipeline allows sequential circulation of refrigerant; circulation duct (13) in which blower (4) is situated to blow dry air so that dry air sequentially circulates from drum (1), heat absorber (19), radiator (17), to drum (1) again; air volume controller which controls blower (4) to adjust dry air volume in circulation duct (13); and compressor controller which controls rotational speed of compressor (16), wherein compressor controller changes rotational speed of compressor (16) based on fluctuation in dry air volume in circulation duct (13).

Abstract: Provided is a laundry dryer including a first duct having a first outlet opening at the rear of a drum storing laundry, and a second duct with a second outlet opening at the front of the drum. The second outlet has a smaller bore allowing air passage than the first outlet. The first and second ducts are selectively switched during the drying process in response to temperature detectors which detect the dry air temperature before and after contact between the air and the laundry. A larger volume of air is blown from the first outlet under selection of the first duct than the second duct whereas the dry air is blown from the second outlet at higher pressure and higher velocity under selection of the second duct than the first duct.

Abstract: A filter regenerating apparatus for an internal combustion engine is disclosed.