This paper presents thermodynamic optimization of an endoreversible air heat pump with variable-temperature heat reservoirs and hot- and cold-side counter-flow heat exchangers. The expressions of the heating load, the exergetic efficiency and the ecological function of the heat pump cycle are...

The optimal configuration of the expansion process of a heated ideal gas inside a cylinder for maximum work output with a movable piston and time-dependent heat conductance is determined in this paper. The heat conductance of cylinder walls is not a constant, but depends on the time-dependent...

A generalized finite-time thermodynamic model of irreversible multi-element thermoelectric generator is established taking into account inner and external factors. The inner effects include Seebeck effect, Fourier effect, Joule effect and Thomson effect. The irreversibility is caused by the...

The influence of physical dimension of thermocouples on the performance of a thermoelectric cooler (TEC) driven by a thermoelectric generator (TEG) is investigated. The physical dimension parameters include the length and the cross-sectional area of thermocouples. The multiobjective analyses...

The operation of a universal steady-flow endoreversible refrigeration cycle model consisting of a constant thermal-capacity heating branch, a constant thermal-capacity cooling branch and two adiabatic branches is viewed as a production process with exergy as its output. The finite-time...

On the basis of the model of the thermoelectric heat pump driven by thermoelectric generator device with external heat transfer, this paper analyzes the effects of generator heat source temperature and heat pump heating temperature on the optimal performance and optimal variables of the combined...

The energy-based ecological criterion consisting of maximizing a function representing the best compromise between the rate of energy pumping and the dissipation of the rate of energy pumping of an endoreversible two-mass-reservoir chemical pump cycle is first deduced. The fundamental optimal...

In this paper, the power density, defined as the ratio of power output to the maximum specific volume in the cycle, is taken as objective for performance analysis of an endoreversible, closed, intercooled regenerated Brayton cycle coupled to constant-temperature heat reservoirs in the viewpoint...

The heating load and coefficient of performance (COP) of a class of generalized irreversible universal steady-flow heat pump cycle model with variable-temperature heat reservoirs and the losses of heat transfer, heat leakage and internal irreversibility are investigated by using the theory of...

The exergoeconomic performance of a class of universal steady-flow endoreversible heat pump cycle model consisting of one heat-absorbing branch, two heat-releasing branches and two adiabatic branches is optimized by using the theory of finite-time thermodynamics. The analytical formulae about...