EFEK PERUBAHAN SUDUT KEMIRINGAN TERHADAP PERPINDAHAN KALOR DAN LAJU ALIRAN AIR PADA UNTAI SIRKULASI ALAMIAH

Abstract

Lessons learned from Fukushima Daiichi nuclear power plant accident was demonstrated the failure of active systems, thus optimizing the passive system become important parameter for cooling process. Passive system which is applying the law of nature called natural circulation phenomena. Efficiency of natural circulation is done by identifying heat loss values using Natural Circulation Simulation Loop (USSA-FT02). Analysis were conducted to determine the effect of the transfer of heat by water to the heat loss that occurs in a closed flow system in the presence of heat distribution on the working fluid (water). Main components of USSA-FT02 consisting of SS316 pipe with diameter 1-inch, pre-heater, heater, and cooler. Experimental variation is the height difference between the hot side and cold side to change the angle of the loop, i.e. at an angle 0o, 45o and 90o. Outlet temperature of the heater and cooler inlet temperature is used as a parameter to be measured and recorded with the experimental period for 45 minutes. Experimental results and analysis based on differences in the angle of 0o, 45o and 90o respectively for the water mass flow rate increases, the highest heat loss along the outlet pipe from the heater to the cooler inlet decreased from 12.3 W to 3.4 W as the angle increases . Then the percentage of the average heat transfer received water heater based on the tilt angle increases successively increased from 49.3%, 52.5% and 55.7%.