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Study on Delay Time Evaluation for Carrier Relay System Using IP Communications Technology
Doi, Hiroki,Shioyama, Takuto,Fujikawa, Fuyuki,Serizawa, Yoshizumi The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
The transmission devices of carrier relay system use exclusive transmission devices and do not use IP (Internet Protocol) communications technology. But the IP communications technology has made remarkable advances recently and is used in the world. If Internet technology can adapt for the transmission device of carrier relay system, electric power company can construct the integration network for power protection and control system which includes carrier relay system. In this report, we will assume the network configuration using Internet technology for the transmission devices of a carrier relay system and show that the transmission devices using Internet technology satisfy the carrier relay specification, such as delay time and differential delay time.
Study on Free Convection Heat Transfer in a Finned Tube Array
Ryoji Katsuki,Tsutomu Shioyama,Chikako Iwaki,Tadamichi Yanazawa 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.1
We have been developing a free convection air cooled heat exchanger without power supply toimprove economic e±ciency and mechanical reliability. However, this heat exchanger requires alarger installation area than the forced draft type air cooled heat exchanger since a large heatingsurface is needed to compensate for the small heat transfer by natural convection. Therefore, we havebeen investigating a heat exchanger consisting of an array of ¯nned tubes and chimney to increasethe heat transfer coe±cient. Since the heat transfer characteristics of ¯nned tube arrays have notbeen clari¯ed, we conducted experiments with a ¯nned tube array to determine the relation betweenthe con¯guration of ¯nned tubes and the heat transfer coe±cient of a tube array. The results showedthat the average heat transfer coe±cient increased with pitch in the vertical direction, and becameconstant when the pitch was over ¯ve times the ¯n diameter. The average heat transfer coe±cientwas about 1.4 times higher than that of a single ¯nned tube in free space. The ratio of the averageheat transfer coe±cient of the ¯nned tube array with chimney to that of a single ¯nned tube wasfound to be independent of the di®erence in temperature between the tube surface and air.