Journal ArticleDOI
A class of irreversible Carnot refrigeration cycles with a general heat transfer law
Zijun Yan,Jincan Chen +1 more
TLDR
In this paper, the performance of a class of irreversible Carnot refrigeration cycles operating between two heat reservoirs at a low temperature TL and a high temperature TH, for which the only irreversibility results from the finite rate of heat conduction, is studied.Abstract:
The performance of a class of irreversible Carnot refrigeration cycles operating between two heat reservoirs at a low temperature TL and a high temperature TH, for which the only irreversibility results from the finite rate of heat conduction, is studied. The relation between the optimal rate of refrigeration and the coefficient of performance of these cycles is derived, based on a general heat transfer law. Moreover, the optimal performance of these cycles is discussed and the effect of different heat transfer laws on the optimal performance is investigated. Consequently, some new and useful results for refrigeration cycles are obtained.read more
Citations
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Journal ArticleDOI
Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes
TL;DR: Entropy generation minimization (finite time thermodynamics, or thermodynamic optimization) is the method that combines into simple models the most basic concepts of heat transfer, fluid mechanics, and thermodynamics as mentioned in this paper.
Journal ArticleDOI
Optimization of thermal systems based on finite-time thermodynamics and thermoeconomics
TL;DR: In this paper, the authors consider the irreversibilities originating from finite-time and finite-size constraints in real thermal system optimization and consider the energy transfer between the system and its surroundings in the rate form.
Journal ArticleDOI
The maximum power output and maximum efficiency of an irreversible Carnot heat engine
TL;DR: In this paper, the effect of thermal resistance, heat leakage and internal irreversibility resulting from the working fluid on the performance of a Carnot heat engine was investigated using a new cyclic model.
Journal ArticleDOI
Thermodynamic modeling of reciprocating chillers
Jeffrey M. Gordon,Kim Choon Ng +1 more
TL;DR: In this article, a simple model for predicting the performance of reciprocating chillers is developed, which is consistent with real performance data for 30 chillers that span a range of cooling rates from 30 to 1300 kW.
Journal ArticleDOI
Effects of internal irreversibility and heat leakage on the finite time thermoeconomic performance of refrigerators and heat pumps
TL;DR: In this article, a performance analysis based on the thermoeconomic criterion has been performed for an irreversible refrigerator and a heat pump by using finite time thermodynamic theory, and the optimal performances and design parameters which maximize the objective functions are investigated.
References
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Journal ArticleDOI
Efficiency of a Carnot engine at maximum power output
F. L. Curzon,B. Ahlborn +1 more
TL;DR: In this article, the efficiency of a Carnot engine for the case where the power output is limited by the rates of heat transfer to and from the working substance was analyzed, and it was shown that the efficiency at maximum power output was given by the expression η = 1 − (T2/T1)1/2 where T1 and T2 are the respective temperatures of the heat source and heat sink.
Journal ArticleDOI
Optimal configuration of a class of irreversible heat engines. I
TL;DR: In this article, the same authors reanalyze the same class of irreversible cyclic heat engines, treating the thermodynamic variables of the working fluid as dynamical variables, and obtain the optimal configuration of the engine when the performance goal is to maximize the average power output per cycle or, alternatively, maximize the efficiency of the engines.
Journal ArticleDOI
Efficiency of some heat engines at maximum-power conditions
TL;DR: In this article, a simple model is presented for a heat engine, where the power output is limited by the rate of heat supply (and/or heat release) and the model leads to a variety of results such as the Carnot law, the Curzon-Ahlborn efficiency, and the Castans efficiency.
Journal ArticleDOI
Optimal staging of endoreversible heat engines
Morton H. Rubin,Bjarne Andresen +1 more
TL;DR: In this article, the authors investigated the performance of two endoreversible engines (i.e., heat engines with the only irreversibility being heat resistance to the surroundings) which are put in series to form a single engine, whose power output is maximized.
Journal ArticleDOI
Finite time optimizations of a Newton’s law Carnot cycle
Peter Salamon,Abrahan Nitzan +1 more
TL;DR: The operation of the engine is viewed as an economic production process with work as its output and it is seen repeatedly that maximum profit operation is a compromise between operation which maximizes the power and operation which minimizes the loss of available work.
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