High School
SAT
ACT
University
MCAT
LSAT
DAT

For heat engine cycle is while for heat pump cycle is

Related Topics

Wize University Physics Textbook (Master) > Thermodynamics

Refrigerators and Heat Pumps

3 Activities

Wize University Physics Textbook (Master) > Thermodynamics

Heat Engines

3 Activities

For heat engine cycle is
while for heat pump cycle is
More Refrigerators and Heat Pumps Questions:
Thermodynamics: Refrigerators and Heat Pumps
A refrigerator is operated by a 1000 watt motor. If the โ€œcoefficient of performanceโ€ of this refrigerator is 5, what is the rate in which heat transfers to the room from the back pf the refrigerator? Imagine you put a plate of food with the total mass of 500g and a temperature of 50 ยฐ๐ถ inside the refrigerator. If the effective specific heat of the plate of food is 4000 Jkgโ‹…K\frac{J}{kg\cdot K}, how long does it take for the refrigerator to cool it down to 5 ยฐ๐ถ?
Thermodynamics: Refrigerators and Heat Pumps
A heat engine with 55% efficiency is used as a refrigerator. If the reservoirs
remain the same, what is the coefficient of performance for this refrigerator?
If the heat absorbed by the refrigerator is equal to 5kJ, calculate the work
A Carnot air conditioner takes energy from the thermal energy of a room at 70o F and transfers it to the outdoors which is at 96o F. For each joule of electric energy required to operate the air conditioner, how many joules are removed from the room?
heat pump refrigerators
A refrigerator has a coefficient of performance of 3.0.
More Heat Engines Questions:
A Carnot engine has an efficiency of 33.0% It operates between constant reservoirs differing in temperature by 95oC.
What are the temperatures of the two reservoirs?
Entropy: Heat Engines
A cylinder contains Nitrogen gas (๐ถv = 20.8Jmol.K\frac{J}{mol.K} , ๐›พ = 1.4) at a pressure of 3 atm and a temperature of 250K. Its initial volume is 2.0 liters. The Nitrogen gas is next carried through the following processes:
a. It is heated in an isochoric process to a temperature of 375K
b. It is expanded at a constant temperature to a volume of 3.0 liters
Heat Engines: Otto Cycle
Otto Cycle is made of two isochoric processes at ๐‘‰0 and ๐‘Ÿ๐‘‰0 for ๐‘Ÿ > 1 and two adiabatic processes which compress and extend the gas between these two volumes.
Plot PV curve of this cycle and find its efficiency in terms of only compression ratio, ๐‘Ÿ and ๐›พ.
In a Stirling heat engine, a monatomic ideal gas at initial volume V1 and temperature T1, takes in heat at a constant volume until its temperature is T2, and then expands isothermally until its volume is V2. It gives out heat at a constant volume until its temperature is again T1 and then returns to its initial state by isothermal contraction. Calculate the efficiency and compare with a Carnot engine operating between the same two temperatures.
Thermodynamics: Heat Engines
A diatomic gas undergoes some thermodynamical processes according to the following plot. Imagine the process from a to b could be changed in order to get different efficiency for the following cycle under the condition that the temperature of the gas cannot exceed the temperature at point a during the entire cycle. What is the work done by the gas from a to b in a process which makes the efficiency of the heat engine equal to the half of the efficiency of a Carnot engine which works in the same range of temperatures? (Assume we have 2 moles of the gas)
PV Curve: Heat Engines
In a Diesel cycle Vo volume of gas is expanded in an isobaric process to
๐›ผ๐‘‰o and then is expanded more to ๐‘Ÿ๐‘‰o in an adiabatic process. The gas in then cooled down via an isochoric process and then is compressed back to its initial volume. Draw PV curve of this cycle and find the efficiency of this cycle only in terms of ๐›ผ, ๐‘Ÿ ,and ๐›พ.
Entropy: Heat Engines
A cylinder contains a diatomic gas at a pressure of 3 atm and a temperature of 250K. Its initial volume is 4.0 liters. The gas is next carried through the following processes:
a. It is expanded isobarically to a temperature of 375K.
b. It is cooled down to 250K in an isochoric process.
Which one of the following statements best describes the operation of a heat engine?
An engine is found to have an efficiency of 0.40. If it does 200 J of work per cycle, what are the corresponding quantities of heat absorbed and rejected?