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Water is heated by submerging 50-mm diameter, thin-walled copper tubes in a tank and passing hot combustion gases (Tg = 750 K) through the tubes. To enhance heat transfer to the water, four straight fins of uniform cross section, which form a cross, are inserted in each tube. The fins are 5 mm thick and are also made of copper (k = 400 W/m · K).
If the tube surface temperature is Ts = 350 K and the gas-side convection coefficient is hg = 30 W/m2 · K, what is the rate of heat transfer to the water per meter of pipe length?
Flowing in a convergent nozzle. At a particular location within the nozzle the pressure is 280kPa, the stream temperature is 345K, and the velocity is 150 m/s. If the cross-section area at this location is 9.29 x 10^3m^2,
Find the enthalpy of the steam discharged into the condenser and the thermal efficiency of the cycle.
a stoped out area with a volume of 20000 m3 is to be used as a receiver. it is to be charged to an absolute pressure of
a long slab is heated to 100oc on both sides and then exposed to a focused stream of cold air on the top edge - giving
A total condenser is to be designed for condensing saturated 2-butanol vapor to form saturated 2-butanol liquid at 1 atm at the rate of 0.72 kmol/h. The saturation temperature of 2-butanol vapor at 1 atm is 99.6C. Cooling water at 25C and 1 atm is av..
An ideal gas refrigeration cycle using air as the working fluid is to maintain a refrigerated space at -23°C while rejecting heat to the surrounding medium at 27°C. If the pressure ratio of the compressor is 3, determine
Water is pumped from a lake at ambient pressure
An 8-kg plunger is released from rest in the position shown and is stopped by two nested springs; the constant of the outer spring is k1 = 4 kN/m and the constant of the inner spring is k2 = 12 kN/m. If the plunger is released from the height
an electrical wire having a diameter of 1.5 mm and covered with a plastic insulation thickness 2.5 mm is exposed to
Helium gas is contained in a rigid vessel of 0.5 m3 at 500 kPa. The gas is agitated violently by a stirrer that transfers 250 kJ of work to the gas. Assuming that the system undergoes an adiabatic process, determine the final pressure of the gas. Ass..
the end of a large tubular workpart is to be faced on a nc vertical boring mill. the part has an outside diameter 45.0
Consider an air-standard Otto cycle starting at 9 psia, 77 deg F, with a compression ratio of 11, and a specific heat addition of 200 Btu/lbm. Assume 80% adiabatic compression efficiency and a 75% adiabatic expansion efficiency. Calculate the overall..
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