Zobrazeno 1 - 10
of 2 227
pro vyhledávání: '"Joon Ahn"'
Autor:
Joon Ahn
Publikováno v:
International Journal of Air-Conditioning and Refrigeration, Vol 32, Iss 1, Pp 1-9 (2024)
Abstract The objective of this study is to design a heat-recovery boiler for a 1 MW-class gas engine-based cogeneration system intended to recover heat from engine exhaust gas. To accommodate high-pressure applications, a water tube-type boiler is se
Externí odkaz:
https://doaj.org/article/ed34b75e7cc14cf084308865822c1d3a
Autor:
Jing Yik Chan, Joon Ahn
Publikováno v:
International Journal of Air-Conditioning and Refrigeration, Vol 32, Iss 1, Pp 1-15 (2024)
Abstract Air conditioner (AC) systems are important for maintaining indoor thermal comfort, but discrepancies can exist between setpoints and the actual room temperature. In the present study conducted in a typical Korean office during summer, we ide
Externí odkaz:
https://doaj.org/article/4f72d9ba617441259be8c25cf57160da
Autor:
Jeong Woo Kwon, Joon Ahn
Publikováno v:
Applied Sciences, Vol 14, Iss 19, p 8821 (2024)
Brush seals are extensively used in rotating equipment, such as gas turbines and compressors, providing effective sealing while accommodating radial, axial, and angular movements between components. In this study, the performance of brush seals with
Externí odkaz:
https://doaj.org/article/db71d1cf2330458a806d0095791caa9e
Autor:
Joon Ahn
Publikováno v:
Energies, Vol 16, Iss 9, p 3656 (2023)
Herein, 50 articles published over the past 20 years on using large eddy simulation (LES) for the internal cooling passage of a gas turbine, especially the mid-chord ribbed channel, are reviewed for the first time. First, the numerical challenges of
Externí odkaz:
https://doaj.org/article/a54942c98e7440e8ba2ae6cb12a40c60
Autor:
Joon Ahn
Publikováno v:
Energies, Vol 15, Iss 23, p 8876 (2022)
Film cooling has dramatically contributed to the performance improvement of gas turbines, as it is a very effective cooling technique for gas turbines. Large eddy simulation (LES) began to be used in the study of film cooling 20 years ago, and meanin
Externí odkaz:
https://doaj.org/article/09ce7536d0cb4fbe8435ad7b2607af5b
Publikováno v:
Applied Sciences, Vol 12, Iss 20, p 10630 (2022)
Heat pumps and refrigeration are key technologies to realize carbon neutrality, and active research is being conducted around the world [...]
Externí odkaz:
https://doaj.org/article/af71965ff9a14ee9a8b826ac544a52bc
Autor:
Seung-Il Baek, Joon Ahn
Publikováno v:
Energies, Vol 15, Iss 7, p 2643 (2022)
The main flow could be unsteady in flow fields of film cooling for several reasons such as flow interactions between the rotor and the stator in the turbine. Understanding the characteristics of the film-cooling flow with an unsteady flow is importan
Externí odkaz:
https://doaj.org/article/deebdecf10aa4a539873a07d00675135
Publikováno v:
Energies, Vol 15, Iss 9, p 2976 (2022)
Utilizing biological processes for hydrogen production via gasification is a promising alternative method to coal gasification. The present study proposes a dynamic simulation model that uses a one-dimensional heat-transfer analysis method to simulat
Externí odkaz:
https://doaj.org/article/bcf150c5b635458e8c28065d74195bef
Autor:
Seung-Il Baek, Joon Ahn
Publikováno v:
Energies, Vol 14, Iss 22, p 7659 (2021)
The effects of pulsations in the main flow on film cooling from a cylindrical hole with a spanwise injection angle (orientation angle) are analyzed using numerical methods. The hole is located on a flat plate with a 35° inclined injection angle, and
Externí odkaz:
https://doaj.org/article/5dabc969e8bb4d3aa5d9c32f53070789
Publikováno v:
Energies, Vol 14, Iss 18, p 5698 (2021)
A series of large eddy simulations was conducted to analyze conjugate heat transfer characteristics in a ribbed channel. The cross section of the rib is square and the blockage ratio is 0.1. The pitch between the ribs is 10 times the rib height. The
Externí odkaz:
https://doaj.org/article/6a08176dc83d423eb14007265db8d731