Patent ID: 8484862
Filing Date: 2013-07-16
Classification: D06F

Abstract:
1. A condensation dryer, comprising: a drying chamber for items to be dried; a process-air circuit; a first fan in the process-air circuit; a heat pump in which a coolant circulates; an evaporator; a compressor; a condenser; a throttle; a temperature sensor to measure a temperature of the coolant; a controller to store a limiting temperature difference, a prespecified limiting number, and a prespecified value; a first comparator to determine a temperature difference between a first temperature of the coolant and a second temperature of the coolant that is measured after a first predetermined period of time and to compare the temperature difference with the limiting temperature difference stored in the controller; a counter to ascertain a number of occurrences in which the temperature difference is greater than or equal to the limiting temperature difference; and a second comparator to compare the number of occurrences in which the temperature difference is greater than or equal to the limiting temperature difference with the prespecified limiting number stored in the controller and to evaluate a number difference between the number of occurrences in which the temperature difference is greater than or equal to the limiting temperature difference and the prespecified limiting number with respect to the presence of an impermissible operating state; wherein a first impermissible operating state is indicated if the number difference is greater than or equal to the prespecified value stored in the controller.