The project ImClean focuses on three main scientific challenges, aiming to improve the specific cooling capacity of thermoacoustic refrigerators that represent a green alternative to conventional refrigeration systems. The first challenge is to investigate experimentally and numerically the acoustic energy losses due to the transition to turbulence in acoustically oscillating flows. An experimental method based on coupled laser velocimetry and microphone measurements will be developed to quantify the acoustic loss due to the change in the flow regime. Also, numerical simulations will be performed and compared with the experimental results. This comparison will help in both deepening the understanding of the mechanism of acoustic energy loss and validating the proposed numerical models. The second challenge is studying the effects of flow discontinuities on acoustic energy losses and providing empirical correlations describing such effects. The developed experimental method for measuring the acoustic energy losses will be utilized to study the effects of flow discontinuities. CFD simulations will also be carried out to study the oscillating flow characteristics around these flow discontinuities. The results of the simulations will be compared with the experimental results to shed light on the physics of such losses. The outcomes of the proposed activities on the first two challenges will be very useful not only in defining the different losses that occur in thermoacoustic systems when operating at high acoustic levels (i.e. for high cooling capacity) but also for other medical and engineering applications. The last challenge is developing a compact and symmetric acoustic source for thermoacoustic applications. Developing such an acoustic source will reduce the total volume of the thermoacoustic refrigerator, hence improving its specific cooling capacity. A double-acting acoustic source will be designed and fabricated, and its performance parameters will be measured.