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Experimentation and optimization of a heat pump integrated dishwasher

Kütük, Erkan
This study aims to develop the optimization of heat pump system working parameters for minimum energy consumption, operating time and noise level for a novel dishwasher. In an integrated heat pump system, compressor speed (N) and air flow rate (V̇) over the evaporator are selected as variables that affects energy consumption (E), acoustic level (A) and operating time (t). Due to the international energy regulations for household appliances, energy efficiency is highly important and for user comfort, operation time and noise level are critical. In order to perform optimization, experiments have been conducted with various parameters and outputs are recorded. Since, it is impossible to test all range of selected parameters and their combinations, experiments are conducted with pre-defined parameters which are compressor speeds and air flow rates. In order to estimate all range of parameter value outputs curve fit polynomials are obtained by using experimental data. The experiment results are compared with the results of analytical analysis. For optimization; energy consumption, operating time and noise level are defined as objective functions. Multi Objective Particle Swarm Optimization (MOPSO) method is used to minimize the objective functions. Optimization is achieved by using Matlab commercial software. The advantage of heat pump system integration is 302 Wh decrease in energy consumption. However, the main disadvantage is an increase in noise level. Noise level may increase up to 46.8 dBA due to compressor and fan. Heating time is longer with heat pump integrated dishwasher (HPIDW) system with respect to electric resistance dishwasher (ERDW). However, cleaning program algorithm can be changed in order to eliminate this elongation of heating time.