An experimental study regarding the determination of seasonal heat transfer coefficient in KURT by convection conditions

Title
An experimental study regarding the determination of seasonal heat transfer coefficient in KURT by convection conditions
Authors
권상기
Keywords
High-level radioactive waste repository KURT Heat transfer coefficient Natural convection Forced convection
Issue Date
2013
Publisher
SAFETY SCIENCE
Series/Report no.
SAFETY SCIENCE; vol.51 startpage 241 endpage 249
Abstract
In high-level radioactive waste repositories, heat is generated by the radioactive decay of the waste. This can affect the safety of the repository because the surrounding environment can be changed by heat transferred through the rock. Therefore, in order to ensure the safety of the repository, the temperature change of the atmosphere in the repository due to the heat generated by high-level radioactive wastes needs to be predicted and an appropriate heat reduction system is required. Through the construction of the KAERI Underground Research Tunnel (KURT) by Korea Atomic Energy Research Institute (KAERI), variable experiments about radioactive wastes disposal are in progress and the data on the properties of the surrounding rock in KURT had already been secured. As the internal heater section in KURT is heated by a heater that is 2 m in length and 5 kWin capacity it heats the inside of the rock in the research module by 90 C, which is regarded as a similar environment to a disposal tunnel. In this study, the seasonal environmental factors (dry?wet-bulb temperature, rock surface temperature, altitude) under the natural and forced convection were measured at the heater section in KURT for the determination of heat transfer coefficient. The results showed that the heat transfer coefficients in the heater section had little seasonal difference. And the averages under natural convection and forced convection were determined 4.53 W/m2 K and 7.46 W/m2 K, respectively.
URI
http://dx.doi.org/10.1016/j.ssci.2012.06.023
http://dspace.inha.ac.kr/handle/10505/32866
ISSN
0925-7535
Appears in Collections:
College of Engineering(공과대학) > Energy Resource Engineering (에너지자원공학) > Journal Papers, Reports(에너지자원공학 논문, 보고서)
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