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For an endoreversible four-heat-reservoir absorption heat-transformer cycle, for which a linear (Newtonian) heat-transfer law applies, an ecological optimization criterion is proposed for the best mode of operation of the cycle. This involves maximizing a function representing the compromise...
This paper presents a generalized irreversible Carnot-engine model that incorporates several internal and external irreversibilities, such as heat-resistance, bypass heat-leak, friction and turbulence. The added irreversibilities besides heat-resistance are characterized by a constant parameter...
A preliminary design efficiency-optimization of an axial-flow compressor, using one-dimensional flow theory, is studied in this paper. A model for the optimum design of a compressor stage, assuming a fixed distribution of axial velocities, is presented. The absolute inlet and exit angles of the...
The thermoeconomics of endoreversible heat engines has been studied based on the linear phenomenological heat-transfer law (i.e., the heat flux Q ∝ Δ(1/ T ), where T is the absolute temperature). Analytical formulae for profit, the maximum profit and the corresponding efficiency are derived.
In this study, a beta-type Stirling engine, with a 192 cc total swept-volume, was manufactured and its performance tested at atmospheric pressure. The hot-source temperature is chosen as a fundamental parameter of the experimental study. Experiments were performed with an electrical heater at...
On the basis of an endoreversible Carnot heat-engine model, the frequency-dependent performance of the engine is analyzed when the heat transfers between the working fluid and the heat reservoirs obey a linear phenomenological heat-transfer law, i.e., Q ∝ (Δ T −1 ). The relations among...
The performance of multi-element thermoelectric-generators, assuming heat-transfer irreversibilities which obey the linear phenomenological heat-transfer law Q ∝ (Δ T −1 ), is studied in this paper by combining finite-time thermodynamics with non-equilibrium thermodynamics. The performance...
A temporal causal graph is built in order to describe the system’s transient behavior. The results can be used to detect faults by monitoring the system’s operation parameters. The system’s simulation model is based on Simulink of Matlab, and the simulation results show that those obtained...
The performance of a generalized irreversible reciprocating heat-engine cycle model consisting of two heating branches, two cooling branches and two adiabatic branches with heat-transfer loss and friction-like term loss was analyzed using finite-time thermodynamics. The relations between the...
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