Refrigeration Thermodynamics
Uv rays
The presence of ozone in the upper atmosphere helps to filter out ____.
non flammable
The six requirements for a refrigerant are nontoxic, noncorrosive, low boiling point, stable gas, high latent heat per unit mass, and what else?
****Working fluid
The substance that is used to transfer heat and work in and out of a thermodynamic system is called the _____.
isoothermal compression
To work performed on the refrigerant is in the form of an _____.
Strictly prohibited
Venting of CFC and HCFC refrigerants to the atmospherwe is _____
***Pressure
When calculating the coefficient of performance of a vapo-compression refrigeration cycle, the ____ received from the cold reservoir cannot be measured directly.
All of these
Actual power cycle efficiencies are always lower than theoretical ones due to _____.
isenthalpic
An ____ process is one where no heat is exchanged between the system and the surroundings.
**** The Surroundings
In a thermodynamic cycle, a system undergoes thermodynamic processes that allow it to interact with ___ and perform some useful function.
****heat
In refrigeration systems, thermal efficiency describes how much ____ was removed compared to the work inpu to the compressor.
Constant temperature
Isothermal processes are carried out under ____.
Through work only
It is important to remember that heat is transferred from _____.
Dont require moving parts / all of the above
Open-cycle refrigeration systems ____.
****None of these
Power cycles ____ useful work from the movement of heat from a hot reservoir to a colder one.
CFC
Refrigerants composed solely of carbon, chlorine, and fluorine are know as ___ refrigerants.
Consume
Refrigeration cycles ____ work in order to move heat from a cold reservoir to a warmed one.
****Immeditatly lowers the [ressure and temperature of the refrigerant
The expansion valve _____.
Mechanical motion
The function of a prime mover cycle is to produce _____.
Evaporative cool
The human body is cooled primarily by ____.
