Drying clothes easily, more and more energy-efficiently and independently of the weather is making tumble dryers a common feature in more and more households. This is why developments are keeping pace with market demands for increasingly energy-efficient dryers. One of the prototype ideas is a sealed heat pump casing. In the development of the new casing, in this thesis we have checked whether it would be optimal to change the drum speed due to the different characteristics of the system. The dryer modification successfully simulated the new heat pump casing, characterised the new system and performed functional tests at three different drum speeds. We have found that by changing the speed, we can influence the drying time and the power consumption. The most optimal drum speed depends on the amount of laundry in the drying cycle.
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