ME 212 HW 1 Due date : 12.03.2009 (homework must be turned in AT THE BEGINNING OF THE 1st LECTURE HOUR)
1) Consider a regenerative gas-turbine power plant with a single stage of compression and two stages of expansion and a regerenator. The schematic diag
ME212 HOMEWORK4 1) In the cooling tower seen below, 1.15 kg of water is sprayed per 1 kg of air entered. Air is enteredtothecoolerwithatemperatureof20C,%60relativehumidityandexitsat30C,%90 relative humidity. Feedwater is at a temperature(T5) of 20C and th
ME212 HOMEWORK5 DueDate:25.05.2009 1) Acetylene gas (C2H2) is burned completely with 20 percent excess air during a steadyflow combustion process. The fuel and air enter the combustion chamber at 25C, and the products leaveat1500K.Determine a)theairfuelra
PS 1 1) In a vapor power cycle, condition of the exhausted water from boiler is 4 MPa, 450C, condition of entrance to the turbine is 3.8 MPa 425C; the pressure of condenser is 7.5 kPa, pump exit pressure is 5.5 MPa, condition of entrance to the boiler is
A gas turbine cycle for use as an automotive engine is shown in figure below. In the first
turbine, the gas expands to just a low enough pressure PSfor that turbine to drive the
compressor. The gas is then expanded through a second turbine connected to th
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ME 212 - Thermodynamics II
Homework #4 - (Due: 27 March 2010)
1-) An insulated rigid tank is divided into two compartments by a partition. One
compartment contains 2.5 lanoi of e02 at 27e and 200 kPa, and the other
compartment contains 7.5 lanol of H2 gas
ME 212 HW 1 Due date : 26.02.2009 (homework must be turned in AT THE BEGINNING OF THE 1st LECTURE HOUR)
1)
1
Turbine 2
BOILER
Turbine 1
2
5 3 Heater 4
Condenser
10
8 6 9 Feedwater Heater 7 P1
P2
In the vapor turbine establishment, vapor enters to the firs
ME 212 PS 3 Solution
1) The masses, temperatures, and pressures of two gases contained in two tanks connected to each other are given. The valve connecting the tanks is opened and the final temperature is measured. The volume of each tank and the final pr
ME212 HW3 1) Two heavily insulated tanks are connected by a valve. Tank A has a volume of 5 m3 and initially containsoxygenat15C,400kPa.TankBhasavolumeof35m3andinitiallycontainsnitrogenat 35C,150kPa.Thevalveisnowopenedandremainsopenuntiltheresultingmixtur
ME 212 HW 4
1) An insulated 100 liter tank contains nitrogen gas at 200 kPa, 25C. Carbon dioxide at 600 kPa, 90C flows from a pipe into the tank until the pressure inside reaches 400 kPa, at which time the valve is closed. Calculate the final temperature
ME 212 HW 5
1) An internal combustion engine burns liquid octane (C8H18) and uses 125% theoretical air. The air and fuel enter at 25C, the products leave the engine exhaust port at 900 K. In the engine 85% of the carbon burns to CO2 and the remainder burn
Name: ID: ME 212 Midterm 1
12.04.2008
1) Refrigeration cycle using R134-a is shown below. Compressors are working isentropically and the rate of heat removal from the refrigerated space is 5kW. P1=0.08 MPa = P7; P2=0.3 MPa=P3=P6; P4=1 MPa=P5; X1=1; X3=1;
ME 212 PS II 19.03.2008
1) A commercial refrigerator with refrigerant134a as the working fluid is used to keep the refrigerated space at 30C by rejecting its waste heat to cooling water that enters the condenser at 18C at a rate of 0.25 kg/s and leaves at
ME 212 PS 3
09.04.2008
1 ) A rigid tank that contains 1 kg of N2 at 25C and 300 kPa is connected to another rigid tank that contains 3 kg of O2 at 25C and 500 kPa. The valve connecting the two tanks is opened, and the two gases are allowed to mix. If the
05.03.2008 ME 212 PS Examples 1) A steam power plant operates on an ideal reheat-regenerative Rankine cycle and has a net power output of 80 MW. Steam enters the high pressure turbine at 10 MPa and 550C and leaves at 0.8 MPa. Some steam is extracted at th
ME 212 MIDTERM 2 SOLUTION 1)
a. The air standard assumptions are: (1) the working fluid is air which behaves as
an ideal gas, (2) all the processes are internally reversible, (3) the combustion process is replaced by the heat addition process, and (4) the
Name: ID: Section: ME 212 Midterm 2 Closed Book Exam Duration: 120 minutes 1) a. What are the air-standard assumptions? b. Why is the carnot cycle not a realistic model for steam power plants? c. Can a vapor-compression refrigeration cycle with a single c
ME 212 PS 1 Solutions
1) An ideal Otto cycle with air as the working fluid has a compression ratio of 9.5. The highest pressure and temperature in the cycle, the amount of heat transferred, the thermal efficiency, and the mean effective pressure are to be