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20. A Case Study on the Plumbing Pipe Burst of Floor Radiant Heating

Author

Hanshik Chung, Hong-Do Jung, Youn-Han Shin, Chen-Kwan Park, and Hyomin Jeong

Subjects
Engineering, business.industry, Thermostat, law.invention, Volumetric flow rate, Radiant heating, Flow velocity, law, Apartment complex, Ultimate tensile strength, Hardening (metallurgy), Composite material, business, Tensile testing
Abstract

Heating pipes burst was occurred in the apartment complex that was applied floor radiant heating system. There were two opinions for the cause of the bursted heating pipes that was the flaw during construction and defects in the product and also there were conflicting among them. Officials analyzed it in order to investigate the cause of the rupture. Tensile test results showed different tensile strength between the lower part of heating pipe and the upper part of heating pipes. The lower tensile strength is maintained while the top was not secured. The reason why rupture heating pipes is that flow velocity isn’t secured and then the air get stagnant. Stagnant air makes hardening. It is caused rupturing. The proper flow rate was confirmed 0.166 m/sec after experiment. It isn’t make stagnant air inside heating pipes.Keywords:Ondol(온돌), Floor radiant heating(바닥복사난방), Thermostat(온도조절기), Tensile strength(인장강도) †Corresponding author Tel.: +82-41-539-9430; fax: +82-41-539-9439 E-mail address: hongdoj@kopo.ac.kr

Published
2012

26. Analysis on Synchronous Rectifier Control to Improve Regulation Capability of High-Frequency LLC Resonant Converter.

Author

Kim, Keon-Woo, Youn, Han-Shin, Baek, Jae-Il, Jeong, Yeonho, and Moon, Gun-Woo

Subjects
*CASCADE converters, *ELECTRIC current rectifiers, *CAPACITORS, *VOLTAGE control, *SWITCHING circuits
Abstract

A new synchronous rectifier (SR) control method is proposed to improve the light-load regulation capability of high-frequency LLC resonant converter. The proposed control method applies the extended SR turn-on time, which results in the negative current flowing through SRs, and the light-load regulation of the LLC resonant converter can be achieved by the negative current. The design guideline of the extended SR turn-on time is presented based on the precise analysis and the equivalent circuit modeling of the LLC resonant converter. In addition, the switching loss and gate driving loss can be reduced because the output voltage can be regulated at low switching frequency. The validity of a proposed control method is confirmed by the experimental results of a prototype converter with 330–380 VDC input and 750 W (12 V/62.5 A) output. [ABSTRACT FROM AUTHOR]

Published
2018
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