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Is it possible for exergy to be negative?
No, exergy is a measure of a system's potential to do work and cannot be negative. If the exergy value calculated for a system results in a negative number, it is likely due to errors in the calculations or assumptions made.
Can joules ever be negative?
In theory, joules can be negative if work is done on a system causing a decrease in its energy. However, in practice, negative values for energy are rarely encountered and are typically only used in certain mathematical or theoretical contexts.
How do you calculate the exergy analysis?
Exergy analysis calculates the maximum useful work that can be obtained from a system by accounting for the quality of energy. It involves determining the exergy input and exergy output of a system, usually by considering factors such as temperature, pressure, and irreversibilities. The exergy efficiency of a system can then be calculated as the ratio of useful work output to the exergy input.
What are some cool engineering words that start with the letter E?
exergy http://en.wikipedia.org/wiki/Exergy
How do you explain that gravity that pulls things to the center of an object?
Exergy and Energy. When the sign of potential energy is negative this is called exergy and indicates that energy comes out, thus exergy. This is the case when opposite charges are involved, the potential energy is negative and this configuration emits energy. When the charges are the same the sign is positive and energy is absorbed in this configuration.Newton discovered that gravity is exergy, emits energy as the masses attract each other. Taking the center at one of the masses, this accounts for the center seeking behavior of gravity.
What do you mean by positive and negative work?
Positive work is input energy, w= -f.d - |fd|cos(fd) , when this is positive energy is put into the system, in this case the force is in the opposite direction of the displacement. Negative work is output energy properly called exergy, w = -f.d, in this case the force is in the direction of the displacement, for example, dropping a ball is exergy, the displacement is in the direction of the force of gravity. This is exergy, work is taken out of the system as opposed to lifting the ball which required putting work into the system. Maxwell had a problem with quaternions because physicists defined positive work as dropping the ball, and the rules of quaternions said dropping the ball is a negative sign and thus exergy, work out, not work in. Around the 1900 this was a major conflict and the physicist won and decided to change the sign on vectors squared , I2 = -1 to +1, so dropping the ball would be positive energy. This is incorrect physics and incorrect mathematics. The sign of the scalar work is negative for work out and positive for work in. This is seen in opposites attract, you get work out and the sign is negative. For like charges the sign is positive and you have to put work in.
What does Exergy LLC manufacture?
The company Exergy LLC manufactures heat exchangers. Heat exchangers are items such as parts for boilers, engines and furnaces. Some of their products are used by Shell.
What has the author Jan Szargut written?
Jan Szargut has written: 'Exergy Method' 'Gospodarka cieplna' -- subject(s): Heat engineering
Why have to put minus sign before the formula of gravitational potential?
The negative sign in the formula for gravitational potential energy is used to signify that the potential energy is defined as zero at an infinite distance from the gravitational source. It allows for the interpretation that as objects move closer together, their potential energy decreases and is considered negative in relation to the reference point.
What has the author M V Sussman written?
M. V. Sussman has written: 'Availability (exergy) analysis' -- subject(s): Enthalpy, Entropy, Mechanical engineering, Thermodynamics
How work related to energy?
Work is the the more general term for the ability to act, ergy. Energy is en-ergy exergy is ex-ergy. Work is a quaternion in that work consists of sclar work and vector work (torque). Energy is the work involved in lifting a mass against gravity. Exergy is the work received form letting a mass fall with gravity. Torque is the work from a windmill.
What has the author John E Ahern written?
John E. Ahern has written: 'The exergy method of energy systems analysis' -- subject(s): Power (Mechanics), System analysis, Thermodynamics
