This work applies the second-law analysis of thermodynamics to quantify the exergy destruction of the components of screw liquid chiller, and to identify the potential for each component to contribute to improve the overall energy efficiency of the system. Three screw liquid chiller units were built to demonstrate the feasibility of the model presented herein. Unit A was a 100 RT water-cooled s...

At present study, thermal performance of a double tube heat exchanger due to stream air/water two phase flow through inner is experimentally studied. Air and hot water were mixed in T-junction outside then followed into exchanger. Told rate was kept constant equal 2 lit/min. For rate, four different rates 3, 4, 5 6 lit/min considered. Also inlet temperature cold streams almost within range 17–1...

The subcritical Organic Rankine Cycle (ORC) with 28 working fluids for waste heat recovery is discussed in this paper. The effects of the temperature of the waste heat, the critical temperature of working fluids and the pinch temperature difference in the evaporator on the optimal evaporation temperature (OET) of the ORC have been investigated. The second law efficiency of the system is regarde...

This paper presents a second-law of thermodynamics analysis to quantify the exergy destruction in each component of an Environmental Control Unit (ECU) for military applications. The analysis is also used to identify the potential contribution from each component to improve the overall energy efficiency of the system. Three ECUs were investigated experimentally at high ambient temperature condi...

Physicist Erwin Schrödinger’s What is Life? (1945) has inspired many subsequent efforts to explain biological evolution, especially the evolution of complex systems, in terms of the Second Law of Thermodynamics and the concepts of "entropy" and "negative entropy." However, the problems associated with this paradigm are manifold. Some of these problems will be highlighted in the first part of th...

We derive a generalization of the second law of thermodynamics that uses Bayesian updates to explicitly incorporate the effects of a measurement of a system at some point in its evolution. By allowing an experimenter's knowledge to be updated by the measurement process, this formulation resolves a tension between the fact that the entropy of a statistical system can sometimes fluctuate downward...

Twentieth-century physics is noted for its plethora of " thought experiments " , mostly provoked by the counterintuitive nature of quantum phenomena. One need only consider the famous Schrödinger's Cat Experiment or the Einstein-Podolsky-Rosen (EPR) Paradox, which address the question of the properties of a quantum object in its unobserved state. These types of experiments, which cannot general...

The relation between the second law of thermodynamics and the notion of irreversibility is analysed by distinguishing three different meanings of the latter and studying how they figure in several versions of the second law. A more extensive discussion is given in [1]. 1. THREE CONCEPTS OF (IR)REVERSIBILITY Many physical theories employ a state space Γ containing all possible states s of a syst...

A unification of thermodynamics and information theory is proposed. It is argued that similarly to the randomness due to collisions in thermal systems, the quenched randomness that exists in data files in informatics systems contributes to entropy. Therefore, it is possible to define equilibrium and to calculate temperature for informatics systems. The obtained temperature yields correctly the ...