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Analysis of the operating parameters of a microchannel beam heat exchanger powered by R290

Choma Anna, Obstawski Paweł

Advances in Science and Technology. Research Journal

2025

Vol. 19, no. 2

151--162

The paper presents an analysis of the cooling performance of a microchannel beam heat exchanger powered by the combustible refrigerant R290 (propane) as a function of design parameters. R290 is an environmentally friendly refrigerant, in the context of growing concerns about climate change and the need for sustainable cooling solutions. Propane characterized by low global warming potential (GWP=3) and zero ozone depletion potential (ODP=0). The studied heat exchanger is dedicated to refrigeration devices where waste heat from mechanical ventilation installations serves as the lower heat source. Performance analyses of the exchanger operating as a condenser in the refrigeration system were conducted based on its design parameters. Several design variations of the exchanger were examined, including different microchannel shapes. Simulation studies were also performed under various operating conditions. The mass flow rate of the refrigerant in the exchanger and the volumetric flow rate of ventilation air were varied. The aim of the conducted research was to reduce the dimensions of the heat exchanger, enabling a reduction in the mass of the combustible refrigerant in the exchanger. Simulation studies were conducted using SolidWorks software with the Flow Simulation library. Over 500 simulations were performed. Based on the obtained results, it was found that using hexagon-shaped or triangle-shaped microchannels with corrugated walls could double the heat transfer rate of the condenser compared to the commonly used square or circular channels.

Analysis of Efficiency of Finned Heat Exchanger Fed with Synthetic and Natural Refrigerant

Choma Anna, Obstawski Paweł

Advances in Science and Technology. Research Journal

2024

Vol. 18, no. 5

318--331

This paper presents a comparative analysis of a finned heat exchanger fed with synthetic refrigerant R410a and environmentally friendly refrigerant R290. Analyses of the performance of the heat exchanger operating as an evaporator in a refrigeration system were carried out. Simulation studies were performed using SOLIDWORKS software with the Flow Simulation library. The analysis was conducted for various design parameters of the device. The performance of the exchanger was examined for different fin materials (aluminium alloys: alloy 1060, 1060-H12, alloy 2014, alloy 2024), number of fins (78 and 39), and fin spacings (2.5 mm and 5 mm). The studies were conducted under various operational parameters of the exchanger (varying volume flow of air and refrigerant mass flow). Based on the results obtained, it was found that the material of the exchanger does not significantly affect its performance. The next conclusion is that when the heat exchanger is fed with an environmentally friendly refrigerant, the heat transfer surface area can be reduced by 50%. As a result, the reduction in heat transfer surface area can be achieved by increasing the fin spacing, which will reduce the electricity consumed in the defrost process under operating conditions, or by reducing the size of the exchanger, which will positively translate into a reduction in the weight of the refrigerant in the system. The possibility of reducing the dimensions of the heat exchanger by up to 50% indicates that replacing R410a refrigerant with environmentally friendly R290 is a promising direction for development. It advocates for ongoing investigations to refine these systems and maximize the operational advantages presented by natural refrigerants.