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A small disk of diameter D1 = 50 mm and emissivity e1 = 0.6 is maintained at a temperature of T1 = 900 K. The disk is covered with a hemispherical radiation shield of the same diameter and an emissivity of e2 = 0.02 (both sides). The disk and cap are located at the bottom of a large evacuated refractory container (e4 = 0.85), facing another disk of diameter D3 = D1, emissivity e3 = 0.4, and temperature T3 = 400 K. The view factor F23 of the shield with respect to the upper disk is 0.3.
(a) Construct an equivalent thermal circuit for the above system. Label all nodes, resistances, and currents.
(b) Find the net rate of heat transfer between the hot disk and the rest of the system.
A double pipe heat exchanger uses water at 15 °C to cool 100 °C fluid (Cp = 2.63kj / kg °K) the water and fluid rates are each 0.5 kg / s . What is the maximum possible heat transfer rate? What effectiveness of the heat exchanger?
Write a paper about Materials for the structure of tanks.
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a uniform rod has the length l200m. the lateral surface area of the rod is perfectly insulated. intially the rod has
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