Finite time thermodynamic analysis of quantum Otto heat engine with squeezed thermal bath

2018 ◽  
Vol 382 (42-43) ◽  
pp. 3051-3057 ◽  
Author(s):  
Bo Xiao ◽  
Renfu Li
Keyword(s):  
Thermodynamic Analysis ◽  
Finite Time ◽  
Heat Engine ◽  
Thermal Bath

Finite Time Thermodynamic Analysis of a Real Vapour Absorption Refrigeration System with and without Heat Leak

2018 ◽  
Vol 6 (8) ◽  
pp. 217
Author(s):  
Sanjay Khatwani ◽  
Govind Maheshwari
Keyword(s):  
Thermodynamic Analysis ◽  
Finite Time ◽  
Heat Engine ◽  
Coefficient Of Performance ◽  
Absorption Refrigeration ◽  
Heat Leak ◽  
Refrigeration System ◽  
Absorption Refrigeration System ◽  
Internal Irreversibility ◽  
Source Sink

This article presents finite time thermodynamic analysis of a real vapour absorption refrigeration system taking into account both external as well as internal irreversibility. The complete VAR model is assumed to be consisting of two sub-systems. One sub-system (generator-absorber assembly) is assumed as an irreversible heat engine cycle whereas another sub-system (evaporator-condenser assembly) is assumed as an irreversible refrigeration cycle. This study analyzes the effect of presence of heat leak on performance of irreversible (real) vapour absorption refrigeration (VAR) system. This is achieved by adding a heat leakage term into an irreversible model of VAR system. Overall coefficient of performance (COP) of the VAR system is optimized with respect to source/sink side heat exchanger areas using Langrangian multiplier method. Furthermore, the effects of the variations in the cycle parameters on performance deviation of the VAR system are compared with and without heat leak. Results show that effect of rate of heat leak is significant along with the other irreversibilities variations on performance deviation of the VAR system.

scholarly journals Simulating Finite-Time Isothermal Processes with Superconducting Quantum Circuits

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 353
Author(s):  
Jin-Fu Chen ◽  
Ying Li ◽  
Hui Dong
Keyword(s):  
Finite Time ◽  
Quantum Computer ◽  
Heat Engine ◽  
Quantum Circuits ◽  
Thermal Bath ◽  
Whole Process ◽  
Quantum Heat Engine ◽  
Control Scheme ◽  
Universal Quantum ◽  
Isothermal Processes

Finite-time isothermal processes are ubiquitous in quantum-heat-engine cycles, yet complicated due to the coexistence of the changing Hamiltonian and the interaction with the thermal bath. Such complexity prevents classical thermodynamic measurements of a performed work. In this paper, the isothermal process is decomposed into piecewise adiabatic and isochoric processes to measure the performed work as the internal energy change in adiabatic processes. The piecewise control scheme allows the direct simulation of the whole process on a universal quantum computer, which provides a new experimental platform to study quantum thermodynamics. We implement the simulation on ibmqx2 to show the 1/τ scaling of the extra work in finite-time isothermal processes.

Thermodynamic Analysis of Thermoelectric Coolers

1998 ◽  
Vol 26 (3) ◽  
pp. 201-209
Author(s):  
Mamdouh El Haj Assad
Keyword(s):  
Cooling Rate ◽  
Thermodynamic Analysis ◽  
Finite Time ◽  
Rate Increase ◽  
Heat Engine ◽  
Coefficient Of Performance ◽  
Thermoelectric Cooler ◽  
Temperature Ratio ◽  
Thermoelectric Coolers ◽  
Dimensionless Parameters

A thermodynamic analysis of a thermoelectric cooler is proposed. The coefficient of performance of the cooler is expressed in terms of two dimensionless parameters which are to be optimized. The thermoelectric cooler is considered as an irreversible Carnot-like reversed heat engine. The effect of the external irreversibilities on the coefficient of performance and cooling rate is investigated by the use of finite-time thermodynamic analysis. The coefficient of performance and cooling rate increase with an increase in the temperature ratio defined in the analysis.

Thermodynamic Analysis of Waste-Heat Thermoelectric Generators

1997 ◽  
Vol 25 (3) ◽  
pp. 197-204
Author(s):  
Mamdouh el Haj Assad
Keyword(s):  
Thermodynamic Analysis ◽  
Finite Time ◽  
Thermoelectric Generator ◽  
Waste Heat ◽  
Heat Engine ◽  
Thermoelectric Generators ◽  
The Real ◽  
Dimensional Parameters ◽  
Heat Engine Cycle ◽  
Engine Cycle

A thermodynamic analysis of a real waste-heat thermoelectric generator is investigated. The thermoelectric generator is considered as a heat engine cycle process with internal irreversibilities. The efficiency of the thermoelectric generator is expressed in terms of two non-dimensional parameters which are to be optimized. A finite-time thermodynamic analysis is used to optimize the temperatures of the hot and cold junctions of the real thermoelectric generator. A comparison between ideal and real waste-heat thermoelectric generators is demonstrated.

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