• Tanzeer Ahmed Khalil Ahmed Kazmi
• Suraj Ghadge

The efficiency and performance of thermal expansion valves (TXVs) are critical for the optimal operation of HVAC and refrigeration systems. This research aims to provide a comprehensive analysis of flow patterns and pressure drops across TXVs, utilizing advanced mathematical modeling techniques. TXVs play a pivotal role in controlling the flow of refrigerant into the evaporator, maintaining optimal temperature and pressure conditions. Despite their importance, the intricate internal flow dynamics of TXVs remain challenging to characterize fully, often leading to inefficiencies and suboptimal performance. To address these challenges, this study employs Computational Fluid Dynamics (CFD) simulations using ANSYS Fluent to model the internal flow dynamics of TXVs under various operating conditions. The primary objectives are to determine the flow patterns, pressure drops, and identify low-pressure areas, low-velocity dead zones, and localized recirculation patterns within the valve. These phenomena can significantly impact the valve's performance by causing uneven refrigerant distribution, increased wear, and reduced heat transfer efficiency. The CFD simulations provide detailed insights into the complex flow behavior within TXVs. The results reveal the presence of low-pressure zones and low-velocity dead zones, which contribute to localized recirculation patterns that adversely affect the valve's efficiency. These areas are often overlooked in simpler models, highlighting the importance of advanced CFD techniques in understanding and optimizing TXV performance. The findings of this study have significant implications for both the design and operational strategies of TXVs. By addressing the identified inefficiencies, manufacturers can improve the overall performance of their systems, leading to enhanced energy efficiency and operational reliability. This research not only enhances the current knowledge base but also sets the stage for future innovations in TXV design and optimization, ultimately contributing to more efficient and reliable HVAC and refrigeration systems.

Thermal Expansion Valves (TXVs), Computational Fluid Dynamics (CFD), Finite Element Methods (FEM), Superheat, Mathematical modeling

"Mathematical modelling of Thermal expansion valves", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 10, page no.f741-f746, October-2024, Available :http://www.jetir.org/papers/JETIR2410581.pdf

"Mathematical modelling of Thermal expansion valves", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 10, page no. ppf741-f746, October-2024, Available at : http://www.jetir.org/papers/JETIR2410581.pdf