Thermodynamics and Energy

1601 Submissions

[3] viXra:1601.0270 [pdf] submitted on 2016-01-25 06:06:21

Response to “Comment on ‘Zero and Negative Energy Dissipation at Information-Theoretic Erasure’”

Authors: Laszlo B. Kish, Claes-Goran Granqvist, Sunil P. Khatri, Ferdinand Peper
Comments: 5 Pages. Accepted for publication in the Journal of Computational Electronics

We prove that statistical information theoretic quantities, such as information entropy, cannot generally be interrelated with the lower limit of energy dissipation during information erasure. We also point out that, in deterministic and error-free computers, the information entropy of memories does not change during erasure because its value is always zero. On the other hand, for information-theoretic erasure—i.e., “thermalization” / randomization of the memory—the originally zero information entropy (with deterministic data in the memory) changes after erasure to its maximum value, 1 bit / memory bit, while the energy dissipation is still positive, even at parameters for which the thermodynamic entropy within the memory cell does not change. Information entropy does not convert to thermodynamic entropy and to the related energy dissipation; they are quantities of different physical nature. Possible specific observations (if any) indicating convertibility are at most fortuitous and due to the disregard of additional processes that are present.
Category: Thermodynamics and Energy

[2] viXra:1601.0233 [pdf] submitted on 2016-01-20 23:48:28

Numerical-Analytical Assessment on Solar Chimney Power Plant

Authors: Nima Fathi, Seyed Sobhan Aleyasin, Peter Vorobieff
Comments: 14 Pages. Preprint

This study considers an appropriate expression to estimate the output power of solar chimney power plant systems (SCPPS). Recently several mathematical models of a solar chimney power plant were derived, studied for a variety of boundary conditions, and compared against CFD calculations. An important concern for modeling SCPPS is about the accuracy of the derived pressure drop and output power equation. To elucidate the matter, axisymmetric CFD analysis was performed to model the solar chimney power plant and calculate the output power for diffrent available solar irradiation. Both analytical and numerical results were compared against the available experimental data from the Manzanares power plant. We also evaluated the fidelity of the assumptions underlying the derivation and present reasons to believe that some of the derived equations, specially the power equation in this model, may require a correction to be applicable in more realistic conditions. This paper provides an approach to estimate the output power with respect to radiation available to the collector.
Category: Thermodynamics and Energy

[1] viXra:1601.0027 [pdf] replaced on 2016-06-08 10:35:47

Motion of an Object Due to the Adjusted Rate of Modifications Performed on Its Environment

Authors: François Barriquand
Comments: 10 Pages.

Abstract. A special statistical model illustrates how an object moving in one dimension, embedded in a tubular structure, can progress anisotropically towards a single direction and produce work. The anisotropic motion of the object is fueled by the thermal fluctuations originating from an ordinary thermal bath, whose coupling with the object depends in a carefully adjusted way on the position of the object itself. A limiting case of this scenario can be solved exactly in a very simple way. From a global physical point of view, it is justified to say that the object and its environment become ever more correlated as time increases ; surprisingly, however, the infinite topology of the system makes it theoretically possible for the object to continue its anisotropic progression at an unabated speed during an infinite time.
Category: Thermodynamics and Energy