Academia >>> Research

This site features a list of the most interesting applied research I have conducted. These projects are presented as a patent and industry-inspired applied research papers that have been published mostly in top-tier, peer-reviewed professional journals. Please feel free to contact me to receive a free copy for your personal use. 

This is patent that describes a flameless impingement oven, which arranges gas and air jets to directly impinge on product , being heated to substantially to promote transfer of heat to the product by impingement transfer rather than by conventional radiation and thermally induced convection . In one embodiment , a set of spaced air and gas nozzles are uniformly distributed on a wall of the oven opposite the product to provide substantially uniform impingement over a surface of the product.

• Olszewski P., Flameless Impingement Oven, Patent US 11,585,601 B2

This study, published in the Journal of Applied Energy, demonstrates thermodynamic and energy effects of a Variable Speed Drive (VSD), powering compressor in a partially loaded chiller system. The implementation of a Variable Speed Drive allows for achieving up to 25% of energy savings.

• Olszewski P., Experimental analysis of ON/OFF and variable speed drive controlled industrial chiller towards energy efficient operation, Applied Energy 309 (2022) 1146–1158, DOI: 10.1016/j.apenergy.2021.118440

This set of studies, published in the Journal of Applied Energy, discuss methodology for optimization of the multi-pump system in parallel configuration controlled by various methods. For this purpose a mathematical model of the experimental pumping station has been proposed as a set of mathematical functions, optimized by a genetic algorithm. Optimization process has been accomplished by own-developed numerical code (C++).

• Olszewski P., Arafeh A., Parametric analysis of pumping station with parallel-configured centrifugal pumps towards self-learning applications, Applied Energy 231 (2018) 1146–1158, DOI: 10.1016/j.apenergy.2018.09.173
• Olszewski P., Genetic Optimization and Experimental Verification of Complex Parallel Pumping Station with Centrifugal Pumps, Applied Energy (2016), DOI: 10.1016/j.apenergy.2016.06.084

The aim of this research is to estimate the influence of compressed air volumetric capacity on the energy consumption in systems equipped with oil-lubricated screw compressors. A mathematical model of oil-lubricated screw compressors has been proposed. The model is verified by comparing with real measurements, and overall uncertainty analysis is estimated.

• Olszewski P., Borgnakke C., Volumetric capacity influence on energy consumption in oil lubricated screw compressors, Journal of Thermal Science and Engineering Applications (2016), Vol. 8, DOI: 10.1115/1.4034091

Pyrolysis of moisture-free samples of wood of various sizes (5–20 mm) and shapes (spheres, cylinders, cubes and rectangular blocks) was experimentally (University of Michigan, Ann Arbor) and numerically (personally developed C++ code) investigated to determine the effect of Shape, Size and Temperature boundary conditions (SST) on the heat and mass transfer processes.

• Atreya A., Olszewski P., Chen Y., Baum H. R., The effect of size, shape and pyrolysis conditions on the thermal decomposition of wood particles and firebrands, International Journal of Heat and Mass Transfer (2017), DOI: 10.1016/j.ijheatmasstransfer.2016.11.051

I focused my interest on an underground energy storage in my doctoral thesis (Warsaw University of Technology, cum laude). The main aim of the research was analysis for using the ground layer as a heat storage for low temperature heating systems powered by heat pumps. Calculations proved, that deeper layers of the ground are cooled down with a time. Analysis has been extended by a summer regeneration of the ground using heat from a battery of solar collectors.

• Olszewski P., The Possibility of Using the Ground as a Seasonal Heat Storage: The Numerical Study, Proceedings of 2004 ASME Heat Transfer/Fluids Engineering Summer Conference 2004, Charlotte, North Carolina, USA, DOI: 10.1115/HT-FED2004-56185

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