The Clausius statement of the Second Law asserts that the process can only take place by doing work on the system; this work is provided by the motor which drives the compressor. However, the process can be quite efficient, and considerably more energy in the form of heat can be taken from the cold object than the work required to do it.
Another statement of the second law is due to Lord Kelvin and Max Planck : No process is possible whose only result is the conversion of heat into an equivalent amount of work.
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Suppose that a cylinder of gas fitted with a piston had heat added, which caused the gas to expand. Such an expansion could, for example, raise a weight, resulting in work being done.
However, at the end of that process the gas would be in a different state expanded than the one in which it started, so that this conversion of all the heat into work had the additional result of expanding the "working fluid" in this case, the gas. If the gas were, on the other hand, then made to return to its original volume, it could do so in three possible ways: a the same amount of work could be used to compress the gas, and the same amount of heat as was originally added would then be released from the cylinder; b if the cylinder were insulated so that no heat could escape, then the end result would be that the gas is at a higher temperature than originally; c something in-between.
In the first case, there is no net work output or heat input. In the second, all the work was used to increase the internal energy of the gas, so that there is no net work and the gas is in a different state from which it started. Finally, in the third case, the gas could be returned to its original state by allowing some heat to be transferred from the cylinder. Comment on 'A note on heat reservoirs and the like'. More specifically, we clarify the use of the Clausius relation and argue that the proposed new definition of reversibility is flawed. Our motivation is the pedagogical need to clarify issues which, despite being subtle, are perfectly tractable.
Kelvin planck law deals with conservation of
Equivalence of the Kelvin—Planck statement of the second law and the principle of entropy increase. We present a demonstration of the equivalence between the Kelvin-Planck statement of the second law and the principle of entropy increase. Despite the fundamental importance of these two statements, a rigorous treatment to establish their equivalence is missing in standard physics textbooks.
The argument is valid under very general conditions, but is simple and suited to an undergraduate course. Kelvin Planck's law deals with.
Kelvin Planck's law deals with A. Conservation of heat B.
Conservation of work C. Conversion of heat into work D. Conversion of work into heat Answer: Option C. Join The Discussion.
Thermodynamics - Mechanical Engineering test questions
The efficiency of Carnot cycle is maximum for A. Gas engine B. Sona Shaikh. No Downloads. Views Total views.
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No notes for slide. Kelvin Planck Statement It is impossible to construct a device that operates in a cycle which receives heat from a single reservoir and convert the entire amount of heat in to work.
Kelvin Planck's law deals with
Clausius Statement It is impossible to construct a device that would operate in a cycle which extracts heat from a low temperature reservoir and supplies to a high temperature reservoir without any external agency. For more detailed information on this topic, please type the link given below or copy it from the description of this PPT and open it in a new browser window. You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later.
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