Chapter 8 Power and Refrigeration Cycles
Chapter 8 POWER AND REFRIGERATION CYCLES
Actual and Ideal Cycles, Carnot cycle, Air-Standard Assumptions 8-1C The Carnot cycle is not suitable as an ideal cycle for all power producing devices because it cannot be
MEEN461
MEEN 461-501 Heat Transfer
Homework 6 Due Tuesday, October 18, 2016 at the beginning of class
FALL 2016
MEEN461
FALL 2016
MEEN461
FALL 2016
MEEN461
FALL 2016
MEEN461
FALL 2016
PROBLEM 5.6
KNOWN: Diameter and initial temperature of steel balls cooling in air.
FIND: Time required to cool to a prescribed temperature.
SCHEMATIC:
ASSUMPTIONS: (1) Negligible radiation effects, (2) Constant properties.
ANALYSIS: Applying Eq. 5.10 to a
PROBLEM 12.71
KNOWN: Temperature and spectral characteristics of a diffuse surface at Ts = 500 K situated in a large
enclosure with uniform temperature, Tsur = 1500 K.
FIND: (a) Sketch of spectral distribution of E and E , b for the surface, (b) Net heat
MEEN 464 Heat Exchanger Experiments
Section # _
Data and Worksheet
Group #_
Date: _
Group Member Names:
Simplified 1st law of thermodynamics:
d
Q
out + W
W
out + m
Q
h m
out h out = ( mcv u cv )
dt
Schematic of a two fluid heat exchanger:
CVsys
TC1
PROBLEM 8.27
KNOWN: Inlet and outlet temperatures and velocity of fluid flow in tube. Tube diameter and length.
FIND: Surface heat flux and temperatures at x = 0.5 and 10 m.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Constant properties, (3)
Chapter 8 Power and Refrigeration Cycles Ideal and Actual Gas-Turbine (Brayton) Cycles 8-57C In gas turbine engines a gas is compressed, and thus the compression work requirements are very large since the steady-flow work is proportional to the specific v
Chapter 8 Power and Refrigeration Cycles Carnot Vapor Cycle 8-90C Because excessive moisture in steam causes erosion on the turbine blades. The highest moisture content allowed is about 10%. 8-91C The Carnot cycle is not a realistic model for steam power
Chapter 8 Power and Refrigeration Cycles
The Reversed Carnot Cycle 8-122C 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 ex
PROBLEM
4.32
Problem 4.38
KNOWN: Internal corner of a two-dimensional system with prescribed convection boundary
conditions.
FIND: Finite-difference equations for these situations: (a) Horizontal boundary is perfectly insulated
and vertical boundary is su
PROBLEM 6.28
KNOWN: Heat transfer rate from a turbine blade for prescribed operating conditions.
FIND: Heat transfer rate from a larger blade operating under different conditions.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Constant propertie
PROBLEM 12.1
KNOWN: Opaque, horizontal plate, well insulated on backside, is subjected to a prescribed
irradiation. Also known are the reflected irradiation, emissive power, plate temperature and
convection coefficient for known air temperature.
FIND: (a)
PROBLEM 7.46
KNOWN: Cylinder diameter and surface temperature. Temperature and velocity of fluids in cross flow.
FIND: (a) Rate of heat transfer per unit length for the fluids: atmospheric air and saturated water, and
engine oil, for velocity V = 5 m/s, u
PROBLEM 11.9
KNOWN: Operating conditions and surface area of a finned-tube, cross-flow exchanger.
FIND: Overall heat transfer coefficient.
SCHEMATIC:
ASSUMPTIONS: (1) Negligible heat loss to surroundings, (2) Constant properties, (3) Exhaust gas
propertie
FALL 2015
MEEN 464
HEAT TRANSFER LAB
Quiz 8 Solution
1. To study two common types of heat exchangers: concentric tube heat exchangers and shell-and-tube
heat exchangers. (25 pts)
2. A. Concentric tube heat exchangers: a smaller tube is arranged inside a l