Universal Trade-Off between Power, Efficiency, and Constancy in Steady-State Heat Engines

Maximum efficiency of steady-state heat engines at arbitrary power.

We discuss the efficiency of a heat engine operating in a nonequilibrium steady state maintained by two heat reservoirs. Within the general framework of linear irreversible thermodynamics we derive a universal upper bound on the efficiency of the engine operating at arbitrary fixed power. Furthermore, we show that a slight decrease of the power below its maximal value can lead to a significant ...

Universal Bounds on Efficiency and Power of Heat Engines with Broken Time-Reversal Symmetry

Signal Design to Optimize Trade-Off between Bandwidth Efficiency and Power Efficiency in Uplink CDMA Systems

In this paper, we compare two signal designs for uplink quasi-synchronous code division multiple access (CDMA) channels in order to optimize the trade-off between bandwidth efficiency and power efficiency. The design we call band-limited DS/CDMA design, is based on the time-domain assignment of Gold sequences, just as in the ordinary DS/CDMA, but with band-constrained cyclic chip interpolation ...

Steady-state modeling of a turbocharger in gasoline engines

The gas flow estimation is crucial for the proper operation and monitoring of turbocharged (TC) engines with a torque structured engine control unit (ECU). This paper presents mean value models developed for modeling gas flow over the compressor, the turbine and the wastegate (WG) in a TC gasoline engine not equipped with a hot film air-mass flow meter (HFM). The turbine flow ...

The Trade-off Between Fast Learning and Dynamic Efficiency

In both static and dynamic, independent private values setups, the efficient allocation is implementable if the distribution of agents’ values is known. Lack of knowledge about the distribution is inconsequential in the static case. But, if distribution of agents’ values is not known in a dynamic framework, and if the designer gradually learns about it by observing present values, endogenously ...