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A temperature-sensing element for the air in a conditioned space is located close to an exterior wall. The wall is poorly insulated such that the inside surface becomes quite cold in the winter. In the northern city locale it may be as low as 0?C. The walls of the room behave nearly like a black surface and the thermometer has ? = 0.9 and a convection heat-transfer coefficient of 14 W/m2 · ?C. When the thermometer reads 28?C, what will be the true air temperature?
calculate the mold constant B. Then compute the solidification time of a 0.5inch by 8inch by 8inch casting poured under the same conditions?
Using the Worrell-Stessel efficiency definition, what air velocity yields the highest efficiency?
Calculate the following the (U10050 Stirling motor) Stirling engine: Overall efficiency, thermal efficiency, mechanical efficiency and the coefficient of performance (CoP). assume that the engine is used as electric generators calculate:
Superheated steam in a piston-cylinder device is initially at 200 °C, 600 kPa. Heat is removed from the system during an isobaric process until half of the mass condenses to saturated liquid
5 kg of air initially at 10oc and 100 kpa is in piston-cylinder device. initially the piston is resting on a set of
A stepping motor has 200 step angles. Its output shaft is directly coupled to leadscrew with pitch = 0.250 in. A worktable is driven by the leadscrew.
Saturated water vapor is contained in a rigid container. Heat is then added until the the pressure and temperature become 812.075 MPa and 400 °C, respectively. What was the initial temperature of the steam in °C?
1. what are the four fundamental quantities of fluids in aerodynamics?2. what are common units used both english usgs
calculate the line voltage and current at the load for t > 0 for a generator voltage of 1 V.
Steam at 75 kPa and 13 percent quality is contained in a spring-loaded piston-cylinder device, as shown in the figure, with an initial volume of 5.28 m^3. Steam is now heated until its volume is 13.20 m^3 and its pressure is 300 kPa.
two streams of air mix together. the first stream state 1 has 4 kgs of air entering at 300k 1 bar. the second stream of
a pump is being used to transfer water from an open tank p1 0 to one having air at 75 psig p2above the water. if 600
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