Engineering, 25.11.2019 23:31 maronetham6253

# For the system of prob. p5.22, assume that a small model wind turbine of diameter 90 cm, rotating at 1200 r/min, delivers 280 watts when subjected to a wind of 12 m/s. the data is to be used for a prototype of diameter 50 m and winds of 8 m/s. for dynamic similarity, estimate (a) the rotation rate, and (b) the power delivered by the prototype. assume sea level air density.

Answers: 3

Engineering, 04.07.2019 18:10

Ahot wire operates at a temperature of 200Â°c while the air temperature is 20Â°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200Â°c20Â°c)/2 = 110Â°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k

Answers: 2

Engineering, 04.07.2019 18:20

Water vapor initially at 10 bar and 400 Â°c is contained within a piston-cylinder assembly. the water lost heat to the surrounding according to isochoric (iso-volumetric) process until its temperature is 150 Â°c. the water is then condensed isothermally to saturated liquid. for the water as a system, calculate the work in kj/kg

Answers: 2

Engineering, 04.07.2019 19:10

Arigid tank contains 10 kg of air at 137 kpa (abs) and 21Â°c. more air is added to the tank until the pressure and temperature rise to 242 kpa (abs) and 32Â°c, respectively. determine the amount of air added to the tank. [r-0.287 kj/kg k]

Answers: 3

Engineering, 06.07.2019 04:10

Consider a power plant with water as the working fluid that operates on an ideal rankine cycle. it has a net power output of 45mw. superheated steam enters the turbine at 7mpa and 500Â°c (h=3411.4 kj/kg; s=6.8 kj/kg k) and is cooled in the condenser at a pressure of 10 kpa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. (a) show the cycle on a t-s diagram (a right schematic is fine - you do not need to calculate the temperatures at each point); (b)-determine the work done by the turbine and the pump in kj/kg; (c)-the mass flow rate of water used by the power plant; (d)-the thermal efficiency of the cycle; (e)-the temperature rise of the cooling water. assume the cooling water is incompressible with cp 4.18 kj/kgÂ°c.

Answers: 3

For the system of prob. p5.22, assume that a small model wind turbine of diameter 90 cm, rotating at...

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