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199806 https://hdl.handle.net/2286/R.2.N.199806 http://rightsstatements.org/vocab/InC/1.0/ http://creativecommons.org/licenses/by-nc-sa/4.0 2025-05 13 pages Fitzgerald, Kenneth Wilbur, Joshua Andersen, Erik Barrett, The Honors College Mechanical and Aerospace Engineering Program This project presents the design and simulation of a compact, energy-efficient water chiller system tailored for cold plunge applications, addressing the inefficiencies of traditional ice-based methods. The system aims to efficiently chill water to 5°C by optimizing heat transfer, cooling time, and energy consumption. Using R-134a as the refrigerant, the refrigeration cycle was modeled in Simulink to evaluate key parameters, including cooling load, coefficient of performance, and power consumption. The simulation identified an optimal water pump flow rate of 0.171 kg/s, achieving a cooling time of under 8 hours and a system efficiency of 3.51. The study demonstrates the feasibility of integrating compact refrigeration systems into personal or small-scale wellness setups, laying the groundwork for future experimental validation and design refinement. Thermodynamics Heat Transfer Fluid Mechanics Water Chiller System Design