In the boiler of a power plant are tubes through which water flows as it is brought from 0.8 MPa, 150°C to 240°C at essentially constant pressure. The total mass flow rate of the water is 100 kg/s. Combustion gases passing over the tubes cool from 1067 to 277 °C at essentially constant pressure. The combustion gases can be modeled as air as an ideal gas. There is no significant heat transfer from the boiler to its surroundings. Assuming steady state and neglecting kinetic and potential energy effects, determine

Let T₀ = 25°C, p₀ = 1 atm.
Round your answers to 3 significant digits.

General Motor Programs solve an issue/flaw of Motor Control Theory. Which one is it? Explain how/why they solve this issue?

If the values for reduced pressure and compressibility factor for ethylene are 2 and 0.6 respectively, compute the temperature.

How many sections do we usually divide the interval in when using Trapezoidal rule?

what can cause water pipes to vibrate and make noise

Precision Machining Technology (2nd Edition)

Chapter 8SU6, Problem 10RQ

Briefly explain the difference between rigid and nonrigid tapping.

Thanks!

what safety precautions should be taken when using a torch inside or near a building

Name and briefly describe at least two approaches to planarization. Indicate which is evolving as the preferred approach.

While looking at the results of an oil pressure test: Technician Asays that higher than normal readings can be caused by using oil that is too thin. Technician Bsays that higher than normal readings can be exppected on a cold engine. Who is correct? a. Tec A b. Tec B c. Both A and B d. Neither A nor B

A mixer operating at steady state has two inlets and one outlet.

- At inlet 1, superheated water vapor at 2 bar and 200°C flows with an average velocity of 1m/s

- At inlet 2, saturated water with a quality of x = 0.5 at 2 bar flows with an average velocity of 1m/s

- At the outlet, saturated water with a quality of x = 0.7 flows through a pipe 5 cm in diameter.

a) Calculate the mass flow rate through the outlet pipe.

b) Calculate the rate of heat loss to the surrounding from the mixer.

What is the process for reversing a DC motor?

What is a stepper motor and give some examples of where a stepper motor may be utilized.

Transformers are very efficient devices with efficiencies of typical distribution and power transformers approaching 96 to as high as 99 percent. List three causes that can reduce transformer efficiencies

Suppose a vertical pipe is to be used as part of a system to manually cycle nutrients upward from the floor of a lake. (Many lakes do this naturally, some do not. Green Lake, near Syracuse, NY, is one such lake.) A pump is to be installed on the lake floor at the base of the pipe. The base of the pipe will have a diameter of 9 cm. The nozzle of the pipe at the top will have a diameter of 4 cm. The lake is 59 m deep at the installation point. (Ignore any viscosity.)

f.)Write an equation that expresses the heat current H of conduction through the ice as a function of the thickness h of the ice sheet (of area A) already formed. Assume the air temperature is a constant -10 ?C, and that the temperature of the bottom of the ice sheet is 0 ?C.

(g) (1 point) Since H = dQ dt , use your answer to (f) to express the amount of heat dQ conducted through the ice sheet in time dt.

(i) (2 points) Express the amount of heat dQ that must be removed from the water at the bottom of the ice sheet to freeze the mass dm you found in (g).

(j) (2 points) Based on (g) and (i), set the expressions for dQ equal to each other to obtain a differential equation relating the heat that must be removed to freeze a new layer to the heat conducted through the ice sheet.

(k) (2 points) Separate variables, and integrate to find the thickness h of the ice sheet as a function of time t. (Note that h = 0 when t = 0