Q. No.1A regenerative Rankine cycle operates with superheat, 2 stages of expansion and one open feed heater. The cycle parameters are:  Boiler exit pressure 100 bar  Super heater exit temperature 600°C  Condenser pressure 0.1 bar  Turbine isentropic efficiency 100% Assume that the feed pump work can be neglected.

i. Determine the optimal inter-stage pressure by selecting the nearest value from the Saturated Water and Steam tables. i.e. do not interpolated between tabulated values. [2 marks]

ii. Sketch the feed heater layout, indicating the fluid streams entering and leaving the feed heater, undertake and energy balance on the feed heater and hence calculate the fraction of steam bled from the turbine. [2 marks]

iii. Calculate the plants thermal efficiency and its specific steam consumption.

iv. State clearly the thermodynamic reasons for the difference in performance between this cycle and similar cycle using a closed feed heater if the closed feed heater operated according the assumptions. What is the disadvantage of using an open feed heater? [2 marks]

v. Draw a schematic diagram of the plant layout and the associated thermodynamic cycle on a T-s diagram.

Given an ideal steam regenerative cycle in which steam enters the turbine at 3.0 MPa, 400 oC, and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.8 MPa for an open feedwater heater. The feedwater leaves the heater as saturated liquid. The net power is 45 MW. Assume any missing data. Draw a neat sketch for the cycle flow diagram showing all states

. Draw the T-s diagram.

Calculate the thermal efficiency of the cycle.

Calculate the steam mass flow rate (in kg/s).

Calculate the total power to the two pumps.

Calculate the mass flow rate of the cooling water in the condenser if its temperature rise is 9 oC.

Q1: Classify and find the general solution of the following differential equations: dy 1. x+ y-In x = 0 dx 2. y" - y' +y = 2 sin 3x.

The logarithmic wind profile assumes horizontal homogeneity and temporal stationarity. Give two examples how those assumptions might be violated here.

Problem 2: In Multi-Effects Desalination (MED) system composed of 4 effects, and 3 feed preheaters and down condenser. List the following: a- The mass balance in the evaporator, feed preheater and down condenser b- The energy balance in the evaporator, feed preheater and down condenser c- The Material balance in the first effect d- The temperature profile of the feed if the intake temperature is 25ºC and temperature of last effect is 40ºC and the temperature of first effect is 60ºC e- What will happen to the transfer area of the evaporator if the motive steam temperature is increased to 100ºC where the rest is remaining constants.

A refrigerator using R-12 as the working fluid

keeps the refrigerated space at 2158C in an environment at

308C. You are asked to redesign this refrigerator by replacing

R-12 with the ozone-friendly R-134a. What changes in the

pressure levels would you suggest in the new system? How

do you think the COP of the new system will compare to the

COP of the old system?

- What is the difference between MED and MSF desalination technology? If you have low grade heat source (Temperature is less than 70ºC) which one is more efficient?

To compare between different desalination system different criteria have been used such as: Performance Ration (PR), Gain Output Ratio (GOR), Specific Energy Consumption (kWh/m3 ) and Unit Product Cost ($/m3 ). Define each one and on your opinion which criteria are considered most useful?

Possible reasons and benefits of using robots in this application (Material handling/ Processing operations/ Assembly and Inspection)

Based on the reading assignment and the textbook, answer the following questions:

a- The impact of increasing the number of effects in MED system on the performance ratio (PR)? And list the reasons (10 Points)

Ideal Reheat Steam Cycle (10)

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at P_H MPa and T_H °C and is condensed in the condenser at a pressure of P_L kPa. Assume the steam is reheated to the inlet temperature of the high-pressure turbine, and that pump work is NOT negligible. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed w_% percent, determine:

(a) the pressure at which the steam should be reheated ,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

P_H = 12.5 MPa, T_H = 550 °C, P_L = 30 kPa and w_% = 11.4%.

Course: Mechanical Vibration

Report Paper ( 1000 words)

Topic is Shakers for Aircraft Suspension Durability Testing

All material must be referenced correctly. Reference could be from Journals, Articles, Books.

Please include at least 2 or 3 reference.

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at P_H MPa and T_H °C and is condensed in the condenser at a pressure of P_L kPa. Assume the steam is reheated to the inlet temperature of the high-pressure turbine, and that pump work is NOT negligible. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed w_% percent, determine:

(a) the pressure at which the steam should be reheated ,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

P_H = 15 MPa, T_H = 650 °C, P_L = 7.5 kPa and w_% = 9.4%.