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Mary Rose
Open systems. A closed system is defined when a fixed volume is under study. There can be mass transfers as well as energy transfers across the boundary.
boncho
. . . it says a closed system can be defined when a fixed volume is under study. An open system is the opposite. The first sentence is defining the difference from closed to open . . .
So, you’re saying an open system is not defined by a fixed volume under study?
1- Closed System :- The system whose boundary does not permit the
transfer of mass between the system and its surrounding i.e. its mass is
constant and only energy being allowed to transfer across the boundary.
*
2- Open System :- is defined as a region is which the mass is not
necessarily constants besides , the mass as well as energy transfer cross its
boundary .
Types of System
Control Mass System (Closed System)
Its a system of fixed mass with fixed identity.
This type of system is usually referred to as "closed system".
There is no mass transfer across the system boundary.
Energy transfer may take place into or out of the system.
Control Volume System (Open System)
Its a system of fixed volume.
This type of system is usually referred to as "open system” or a "control volume"
Mass transfer can take place across a control volume.
Energy transfer may also occur into or out of the system.
A control volume can be seen as a fixed region across which mass and energy transfers are studied.
Control Surface- Its the boundary of a control volume across which the transfer of both mass and energy takes place.
The mass of a control volume (open system) may or may not be fixed.
When the net influx of mass across the control surface equals zero then the mass of the system is fixed and vice-versa.
The identity of mass in a control volume always changes unlike the case for a control mass system (closed system).
Most of the engineering devices, in general, represent an open system or control volume.
I'm talking about judging my sources and making denigrating comments about them that if directed to a member, would be against the terms and conditions.
Going into a temper tantrum about public figures is not conducive to civilized debate.
Mary Rose
boncho
Heat is converted to work (or vice versa). There is no way you can change this. Heat is calculable, and so is work.
But is heat calculable and work calculable taking the fact that all "working mediums" don’t behave with the same efficiency into consideration, or not?
Am I making any sense?
DenyObfuscation
How about the topic of this thread? Is that just another springboard to your game "Slander the Scientists"?
DenyObfuscation
Where do you stand at the moment regarding the question in this thread's title?
Mary Rose
But is heat calculable and work calculable taking the fact that all "working mediums" don’t behave with the same efficiency into consideration, or not?
Mary Rose
As far as I'm concerned, a heat pump in a temperate climate, an "energy superstar," is an overunity device
As far as I'm concerned, a heat pump in a temperate climate, an "energy superstar," is an overunity device, the asinine reasoning behind "overunity doesn't exist" notwithstanding.
Mary Rose
. . . Carnot believed: Heat itself is converted to work; therefore, all "working mediums" behave with the same efficiency.
He posted temperature-pressure charts for some industrial refrigerants. The charts illustrated the fact that pressure change in relation to the temperature range is different; that is, each compound is shown to be behaving differently. They don't all produce the same pressure increase as the temperature rises.
He said that this is common knowledge among HVAC technicians but that physicists seem to be ignoring this obvious fact.
The ideal gas law PV=nRT provides a good approximation in many cases, but there is more accurate math which takes the material into account, like this:
Mary Rose
Can you take the above example of the compounds used for industrial refrigerants and show some math for it which will illustrate how the pressure change in relation to the temperature range is accurately reflected as not a constant?
If you scroll further down in that link there is more advanced math.
Above the critical temperature the van der Waals equation is an improvement of the ideal gas law, and for lower temperatures the equation is also qualitatively reasonable for the liquid state and the low-pressure gaseous state. However, the van der Waals model is not appropriate for rigorous quantitative calculations, remaining useful only for teaching and qualitative purposes.
Mary Rose
reply to post by DenyObfuscation
Of course I'm not talking about linking to sources for outside quotes that I post.
I'm talking about judging my sources and making denigrating comments about them that if directed to a member, would be against the terms and conditions.
Going into a temper tantrum about public figures is not conducive to civilized debate.edit on 11/26/13 by Mary Rose because: Clarify
Quite frankly, I don't think anyone has ever offered this much real information on the subject of Thermodynamics, in one package before. So, this must be your lucky day!
I criticize mainstream science for good reason.
I don't slander an individual.
Mary Rose
Mary Rose
But is heat calculable and work calculable taking the fact that all "working mediums" don’t behave with the same efficiency into consideration, or not?
Re-reading my post, I think I could have worded it with more clarity.
Mary Rose
Mary Rose
But is heat calculable and work calculable taking the fact that all "working mediums" don’t behave with the same efficiency into consideration, or not?
Re-reading my post, I think I could have worded it with more clarity.
Let me try again: When heat and work are calculated, is the fact that "working mediums" don't behave with the same efficiency taken into consideration as part of the equation? Or should I say formula?
An example with an explanation of which symbol represents it would be helpful.
Mary Rose
reply to post by dragonridr
The video that I was watching was not on heat pumps.
It was on thermodynamics. More specifically open system thermodynamics.
I took the example of heat pumps out of it to start this thread.
The whole history of the understanding of heat was presented and interpreted.
The whole history of the understanding of heat was presented andinterpreted.misinterpreted.
Mary Rose
Mary Rose
“On Extracting Electromagnetic Energy from the Vacuum” by Thomas E. Bearden
It is known in particle physics that there can be no symmetry of a mass system without the incorporation of the active vacuum interaction, yet this too is missing from classical electrodynamics. Symmetry implies nonobservables, and asymmetry implies observables. So every observable mass system, being asymmetrical a priori, must be accompanied by nonobservables interacting with it, else it can have no symmetry (or equilibrium). Yet classical electrodynamics continues to assume equilibrium and symmetry in observable systems without incorporating the active vacuum. Everywhere we examine classical electrodynamics, we find non sequiturs of first magnitude. This alone should be a compelling reason for the scientific community to assign the highest priority, ample funding, and the best theoreticians to the sorely-needed revision of electrodynamics from the foundations level up.
Mary Rose
There is another important paragraph:
Symmetry implies nonobservables, and asymmetry implies observables.