자연순환 온수 난방장치에서 열부하에 미치는 코일관 보일러의 형상인자들에 대한 연구 = Experiment on the Effect of Geometries of Coil Tube Boiler to Thermal Load for a Free Convection Hot Water Domestic Heating System

다국어 초록 (Multilingual Abstract)

So called "Saemaul-Boiler"is a domestic heating system composing a closed loop of tube, through which is circulating a hot water mobilized by natural convection effect in boiler. This heating system was simplified to a single phase closed thermo-loop, having an element of helically coiled tube heated externally by electric resistance wire.
The investigation was put on some parameters of coil tube such as helix angle, curvature ratio and tube diameter in order to understand their effects on mass flow rate of working fluid in the loop system.
From the results of the experiment it was shown that :
1) The heilx angle and diameter of coil tube might have a considerable importance on improuvement of thermal load by increasing mass flux of working fluid.
2) But the curvature ratio had relatively negligible effect.