A Carnot heat engine has an ideal efficiency of 34% and produces
25 kW of output power. At what rate (MJ/h) must it discharge heat
when operating at full power?
A Carnot engine uses air as the working substance, receives heat
at a temperature of 315oC, and rejects it at
65oC. The maximum possible cycle pressure is 6.0MPa and
the minimum volume is 0.95 liters. When heat is added, the volume
increases by 250%. Determine the pressure and volume at each state
in the cycle.
A Carnot heat engine receives heat at 850 K and
rejects the waste heat to the environment at 298 K.
The entire work output of the heat engine is used to drive a Carnot
refrigerator that removes heat
from the cooled space at -17⁰C at a rate of 450 kJ/min and rejects
it to the same environment at 298
K. Determine;
(a) the rate of heat supplied to the heat engine and
(b) the total rate of heat rejection to...
Professor Modyn wants to power his refrigerator with a heat
engine. A Carnot heat engine receives heat from a reservoir at
493.0°C at a rate of 767 kJ/min and rejects heat to the ambient air
at 29.1°C. The entire work output of the heat engine is used to
drive a refrigerator that removes heat from the refrigerated space
at -3.23°C and transfers it to the same ambient air at 29.1°C.
Note: The IUPAC sign conversion for work is used. Work...
An ideal diesel engine uses air as the working fluid and operates
with a thermal efficiency ?th =0.5 with a rate of heat addition
Qin=120 kW. The temperature at the beginning and the end of the
addition heat (combustion) are respectively: T2=900 K and T3=2100
K. Assume constant specific heats (Cp and Cv). The air properties
at a room temperature T1=293.0 K are: Cp=1.005 kJ/kg.K,
Cv=0.718KJ/kg.K, the gas constant of air is R=0.287 kJ/kg.K and the
ratio of specific heats...
A Carnot heat engine within a piston cylinder has 10 kg of air
as the working fluid and operates between 1000 K and 350 K. During
the heat addition process the pressure changes by a factor of 2.5.
The volume at the end of the isentropic compression process is
5m^3. Determine the pressure at each state in kPa and the net heat
of the cue in KJ assuming Constant Heats at 300 K. Draw a P-v and
T-s diagram
A mole of an ideal gas goes through a cycle of a Carnot engine.
Draw the pressure vs volume and entropy vs temperature planes for
this cycle. What do the diagrams look like when the efficiency of
the cycle is 50% and 99%. Then Calculate the work done per cycle by
the gas and find the efficiency of the cycle.
8-12)A heat engine operates in a Carnot cycle between 84.0°C and
355°C. It absorbs 21,600 J of energy per cycle from the hot
reservoir. The duration of each cycle is 3.00 s.
(a) What is the mechanical power output of this engine?
kW
(b) How much energy does it expel in each cycle by heat?
kJ
12)A Carnot engine operates between 105°C and 18°C. How much ice
can the engine melt from its exhaust after it has done 4.0 ✕...
Efficiency of an engine operating condition to Carnot cycle is
equal to ? = 0.45. Temperature and specific volume of the gaseous
working medium at the beginning of isentropic compression are T1 =
600 K and v1 = 0.5 m3/Kg respectively. Find the gas
properties at all other characteristic points of the cycle and the
amount of heat released during isothermal compression. Assume that
the mass of 1Kg of the gas undergoes the sequence of processes
corresponding to Carnot cycle....