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The reversible expansion of an ideal gas can be used as an example of an isobaric process. [3] Of particular interest is the way heat is converted to work when expansion is carried out at different working gas/surrounding gas pressures. This picture has been created using open access software.
The rubber band experiment can be modeled as a thermodynamic cycle as shown in the diagram. The stretching of the rubber band is an isobaric expansion (A → B) that increases the energy but reduces the entropy (this is a property of a rubber bands due to rubber elasticity). Holding the rubber band in tension at ambient temperature is an ...
A thermodynamic cycle consists of linked sequences of thermodynamic processes that involve transfer of heat and work into and out of the system, while varying pressure, temperature, and other state variables within the system, and that eventually returns the system to its initial state. [1] In the process of passing through a cycle, the working ...
The four points in the graph indicate the crank angle in degrees. [7] The adiabatic Stirling cycle is similar to the idealized Stirling cycle; however, the four thermodynamic processes are slightly different (see graph above): 180° to 270°, pseudo-isothermal expansion. The expansion space is heated externally, and the gas undergoes near ...
Expansion of working fluid takes place isentropically and work is done by the system on the piston. The volume ratio / is called the "isentropic expansion ratio". (For the Otto cycle is the same as the compression ratio /). Mechanically this is the expansion of the hot gaseous mixture in the cylinder known as expansion (power) stroke.
Figure 2 If the process is isobaric, then the work done on the piston is easily calculated. For example, if the gas expands slowly against the piston, the work done by the gas to raise the piston is the force F times the distance d. But the force is just the pressure P of the gas times the area A of the piston, F = PA. [4] Thus W = Fd; W = PAd ...
v. t. e. The Brayton cycle, also known as the Joule cycle, is a thermodynamic cycle that describes the operation of certain heat engines that have air or some other gas as their working fluid. It is characterized by isentropic compression and expansion, and isobaric heat addition and rejection, though practical engines have adiabatic rather ...
The following is a list of the four processes that occur between the four stages of the ideal Ericsson cycle: Process 1 -> 2: Isothermal compression. The compression space is assumed to be intercooled, so the gas undergoes isothermal compression. The compressed air flows into a storage tank at constant pressure.