ライブラリ登録: Guest

ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-517-2

5-6th Thermal and Fluids Engineering Conference (TFEC)
May, 26–28, 2021 , Virtual

An Ejector-based Refrigeration System as a Sustainable Solution to Disaster Relief

Get access (open in a dialog) pages 383-387
DOI: 10.1615/TFEC2021.ens.036531

要約

Natural disaster-prone regions have an impending need for preserving essentials such as food, agricultural produce, and medicines. A low-cost, ejector-based refrigeration system is being designed to address this scenario, considering the effects of sources of waste heat and environmentally friendly refrigerants. Utilizing the mechanisms of (i) entrainment between the primary (driving) flow and the entrained refrigerant (or driven) flow and (ii) turbulent mixing, the refrigerant is compressed in the ejector. The ejector efficiency and entrainment ratios were estimated experimentally in previous studies with air as the working fluid. In the current study, the thermodynamic analyses of the ideal reverse Carnot refrigeration cycle were preformed using an in-house Python program (EjecRef v 1.0). This program is used to analyze R134a (1,1,1,2-Tetrafluoroethane) and can be extended to R744 (carbon dioxide), and R290 (propane) refrigerants under varying conditions of entrainment ratios, total pressures, and total temperatures in the idealized ejector-based refrigeration cycle, visualized on the temperature-entropy and pressure-enthalpy graphs. This program also takes into consideration the state of the evaporator and the ejector efficiency. The combination of previously published experimental data and the current thermodynamic analyses using the EjecRef program (v 1.0) provides operational characteristics such as the coefficient of performance (COP), and realistic design constraints such as cooling capacity of the ejector-based refrigeration system. The insights gained will aid in designing a refrigeration system to address the needs of disaster-hit regions, especially in the developing world.