Dang, T.; Nguyen, H. A Study on the Simulation and Experiment of Evaporative Condensers in an R744 Air Conditioning System. Micromachines2023, 14, 1826.
Dang, T.; Nguyen, H. A Study on the Simulation and Experiment of Evaporative Condensers in an R744 Air Conditioning System. Micromachines 2023, 14, 1826.
Dang, T.; Nguyen, H. A Study on the Simulation and Experiment of Evaporative Condensers in an R744 Air Conditioning System. Micromachines2023, 14, 1826.
Dang, T.; Nguyen, H. A Study on the Simulation and Experiment of Evaporative Condensers in an R744 Air Conditioning System. Micromachines 2023, 14, 1826.
Abstract
Numerical simulations and experiments on evaporative condensers in air conditioning systems using R744 were performed. Two configurations were given to study the feasibility of operating the subcritical R744 cycle. It indicated the capable of evaporative cooling condensing R744 to liquify by analyzing the outlet temperature at the end of the condenser reached from 28.7oC to 30.3oC with the operating pressure from 72.6 bar to 68.5 bar. The mass flow rate in the study increases from 14.34 kg/h to 46.08 kg/h, the pressure drop also increases from 0.23 bar to 0.47 bar for the simulation and 0.4 bar to 0.5 bar for the experiment, respectively. This study indicates that a 5-layers of copper tubes configuration causes a higher pressure drop and lower COP when compared to an 8-layers of copper tubes that split into 2 sets for smaller pressure drop. In this study, the evaporative condensers using mini tubes that are flooded in the cooling water tank are suitable for the subcritical R744 air conditioning system. The results obtained from the experimental data are in good agreement with those obtained from the numerical results, with the deviation less than 5%.
Keywords
evaporative condenser; R744; subcritical; pressure drop; air conditioning
Subject
Engineering, Mechanical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
