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The aim of the research work describe in this paper is to investigate correlation of water, air massflow rate and calor fluks to heat transfer coefficient. The investigation was carried out toward a pipe section test developed from acrylic with diameter of 60 mm and 210 mm length, therefore, the buble can be easier to shoot. A concurrent water were flowed upward and air was injected from the bottom. The wall of the heater was heated using two thermocouple installed at the outer surfece of the heater. The fluid flow was measured using thermocouple installed along the annulus pipe. A heater with transparent tube diameter of 50 mm and 1800 mm length was also installed, and supplied with 1000 Watt electric power. Result of the experiment showed that heat transfer coefficient incresed along with the air massflow rate increased, and its decreased with the increasing of water mass flow rate. The maximum heat transfer coefficient of 4340,602 W/m2 °C at electric fluck calor of 29582,448 W/m2 was echieved on water volume flow rate of 3 lpm and 9 lpm of air volume rate.

Studi ini ditujukan untuk mengetahui pengaruh material insulasi Glaswool, Styrofoam dan Alumunium foil terhadap besarnya kalor yang dikonduksikan atap fiber, utamanya pada atap rumah tangga. Penggunaan panas di bawah atap rumah masih sangat jarang dilakukan, dimana panas ini bisa dimanfaatkan untuk memanasi air hangat untuk mandi, atau sejenisnya. Metoda yang dilakukan adalah dengan mengukur temperatur pada titik yang terdistribusi di ruang atap yang ada, kemudian menghitung aspek perpindahan panas yang terdistribusi meliputi volume di bawah atap tersebut.