Effect of Filter Fabric Types and Filter Designs on Energy Efficiency and Microfiber Retention Capacities of Heat Pump Tumble Dryers

Heat pump tumble dryers are devices known for their low energy consumption and garment protection. The heat pump system heats the air, circulates it through the drum, and cools the moist air to condense it into water. Tumble dryers use a lint filter to remove microfibers from the airflow. However, due to the limited filtration capacity and efficiency of lint filters, microfibers are released into both terrestrial and aquatic ecosystems. In addition to their inefficiency in retaining microfibers, lint filters in heat pump tumble dryers also affect airflow, reducing energy efficiency. To address these disadvantages, there is a need for lint filters in tumble dryers that are more effective at retaining microfibers while minimizing impact on airflow. This study aims to modify both the filter fabric, and the design of lint filters used in heat pump tumble dryers. The specifications of alternative filter fabrics and their impact on the airflow in dryers were evaluated as potential replacements for the current filter fabrics. Based on these findings, the optimal filter fabric specifications were identified, and structural design modifications were made to the filters. Experiments conducted with the newly designed filter showed a reduction in airflow obstruction within the tumble dryer. Consequently, the use of this newly designed filter improved the energy efficiency of the tumble dryers.