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Consider an opaque horizontal plate that is well insulated on its back side. The irradiation on the plate is 2500 W/m2 of which 500 W/m2 is reflected. The plate is at 227°C and has an emissive power of 1200 W/m2. Air at 127°C flows over the plate with a heat transfer convection coefficient of 15 W/m2 · K. Determine the emissivity, absorptivity, and radiosity of the plate. What is the net heat transfer rate per unit area?
A 10 mm thick Teflon sheet is perfectly bonded to a large 9 mm thick type 316 stainless steel sheets. The interface is at 119?C and the outer surface of the steel sheet is at 120?C. Take K Teflon = 0.25W/m.K K 316 Steel = 13.4 W/m.K In steady state, ..
A balanced-cross-flow compact heat exchanger is required for an air heating system that processes 0.5 kg/s air. The inlet temperature for the hot water is 295 K, and the cold air enters at 270 K to be heated to 287 K. The inlet pressure for the hot w..
water is the working fluid in a regenerative rankine cycle with one closed feedwater heater and one open feedwater
Disk A has a mass of 5 kg and disk B has a mass of 6 kg. They have the initial velocities shown in the figure. The coefficient of restitution between the disks is e = 0.4.
a 2.0 kg of water at 90 deg. c and 1 bar is placed in a vertical cylinder and sealed with a massless piston. the piston
A collar (A) that slides along a smooth horizontal bar. The mass of the collar is 14 kg, and the mass of block (B) is 18 kg. The spring constant for the spring connecting the collar to the frame is 700 N/m.
the 8-oz ball is supported by the vertical stream of fresh water which issues from the 12-in. diameter nozzle with a
thermal convection in the presence of heating can be modelled bydtdt u dtdx v dtdy qcp k d2tdx2 d2tdy2 all are
the nozzle shown discharges a sheet of water through a 180 degree arc. the water speed is 15 ms and the jet thickness
a wall has inner and outer surface temperatures of 16c and 6c respectively. the interior and exterior air temperatures
A vacuum gage connected to a chamber reads 35 kPa at a location where the atmospheric pressure is 92 kPa. Determine the absolute pressure in the chamber.
an safety relief valve is installed on a tank. the lines downstream and upstream of the valve are 8 in schedule 40
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