ME 305 TEST 2
A boiler produces 1000 kJ of heat per kg of working fluid. The efficiency of the Rankine cycle is 40%.
What is the mass flow of working fluid to produce 10,000 kW of power?
Condensate at 60oC is pressurized in a pump from 20 kPa to 2 MPa. If
ME 305 Regenerative Rankine Cycle Notes
10.1 C Moisture content remains the same, everything else decreases.
10.2 C This is a smart idea because we waste little work potential but we save a lot from the heat input.
The extracted steam has little work pote
ME 305 The Reversed Carnot Cycle Notes
11.1 C Because the compression process involves the compression of a liquid-vapor mixture which
requires a compressor that will handle two phases, and the expansion process involves the expansion of
high-moisture con
ME 305 Partial Derivatives Notes
12-1C
z
x dx
y dy
z zx zy
x
12-2C For functions that depend on one variable, they are identical. For functions that depend on two or
more variable, the partial differential represents the change in the function with one of
ME 305 The Maxwell Relations Study Guide
12.4 The validity of the last Maxwell relation for refrigerant-134a at a specified state is to be verified.
Analysis We do not have exact analytical property relations for refrigerant-134a, and thus we need to
repl
ME 305 The Clapeyron Equation Study Guide
12.4 C It enables us to determine the enthalpy of vaporization from hfg at a given temperature from the P,
v, T data alone.
12.5 C It is assumed that vfg vg RT/P, and hfg constant for small temperature intervals.
ME 305 Carnot Vapor Cycle
10.1 Because excessive moisture in steam causes erosion on the turbine blades. The highest moisture
content allowed is about 10%.
10.2 The Carnot cycle is not a realistic model for steam power plants because (1) limiting the heat
ME 305 Combined Gas Vapor Power Cycles Study Guide
10.1 C The energy source of the steam is the waste energy of the exhausted combustion gases.
10.2 C Because the combined gas-steam cycle takes advantage of the desirable characteristics of the gas
cycle a
Exam 1 Review Problems
11.1
A steady-flow Carnot refrigeration cycle with refrigerant-134a as the working fluid is considered.
The COP, the condenser and evaporator pressures, and the net work input are to be determined.
Assumptions 1 Steady operating con
ME 305 Cogeneration Study Guide
10.1 C The utilization factor of a cogeneration plant is the ratio of the energy utilized for a useful purpose
to the total energy supplied. It could be unity for a plant that does not produce any power.
10.2 C No. A cogene
ME 305 Fundamentals of Engineering Exam Problems
10.1 Consider a steady-flow Carnot cycle with water as the working fluid executed under the saturation
dome between the pressure limits of 8 MPa and 20 kPa. Water changes from saturated liquid to saturated
ME 305 Absorption Refrigeration Systems Notes
11.1 C Absorption refrigeration is the kind of refrigeration that involves the absorption of the refrigerant
during part of the cycle. In absorption refrigeration cycles, the refrigerant is compressed in the l
ME 305
Unit Conversion Factors
LENGTH
1 m = 3.2808 ft = 39.37 in = 100 cm = 106 m = 1010 Angstrom
1 ft = 0.3048 m = 12 in = 30.48 cm = 0.33333 yd
1 km = 1000 m = 0.621 mi
1 in = 2.540 cm = 0.0254 m
1 mi = 5280 ft = 1760 yd = 1609.4 m
AREA
1 m2 = 10.76 ft2
ME 305 TEST 28 Fall 2014
Problems
1. {40%) An idea! Rankine cycle for a pewerplant with reheat and an open fecdwater heater is Shown
below along with a table giving much of the inl‘enmttien about the thermedvnamie states. (:1) Fill in
the blanks in the ta
ME 305-001, 002, -996 Thermodynamics II
Fall 2014
Catalog Entry:
ME 305. Thermodynamics II. (3-0). Three hours. Thermodynamic cycle analysis, Maxwell relations and development of thermodynamic properties, and thermodynamics of non-reacting and reacting mi
ME 305 TEST 1A Fall 2014
Problems Name S 0 C. u I ( Q N
Work the following three problems and show all work for partial credit. Put answers in blanks.
1. (20%) Steam with T1 = 1000°F, P1 = 1750 psia, h] = I483 Btu/[hm and s] = 1.5796 Btu/lbm-R en-
ters a
ME 305 TEST 13 Fall 2014
Problems Name 5 0L. u 1 t 0 rd
Work the following three problems and show all work for partial credit. Put answers in blanks.
l. (20%) Steam with T1 = 1000°F, P. = 1500 psia, h] = 1491 Btu/lbm and s. = 1.6007 Btu/Ibm-R en-
ters a
ME 305 TEST-2A Fall 2014
Name M
Problems
1. (40%) An ideal Rankine cycle for a powerplant with reheat and an open feedwater heater is shown
below along with a table ivin much of the information about the thermod amic states. (a) Fill in
the blanks in the
ME 305 Fundamentals of Engineering Exam Problems
11.1 Consider a heat pump that operates on the reversed Carnot cycle with R-134a as the working fluid
executed under the saturation dome between the pressure limits of 140 kPa and 800 kPa. R-134a changes
fr
ME 305 Innovative Refrigeration Systems Notes
11.1 C Performing the refrigeration in stages is called cascade refrigeration. In cascade refrigeration, two
or more refrigeration cycles operate in series. Cascade refrigerators are more complex and expensive
ME 305 Gas Refrigeration Cycles Study Guide
11.1 C The ideal gas refrigeration cycle is identical to the Brayton cycle, except it operates in the reversed
direction.
11.2 C The reversed Stirling cycle is identical to the Stirling cycle, except it operates