Table of Contents
What is availability energy?
Available energy is that of energy which is available for doing work. It is either work or that portion of energy that can be converted wholly into work.
What is difference between availability and available energy?
Availability: When a system is subjected to a process from its original state to dead state the maximum amount of useful work that can be achieved under ideal conditions is known as available energy or availability of the system. The energy which cannot be utilised for doing useful work is called unavailable energy.
The Carnot cycle and the available energy is shown in figure. The area 1-2-3-4 represents the available energy. The shaded area 4-3-B-A represents the energy, which is discarded to the ambient atmosphere, and this quantity of energy cannot be converted into work and is called Unavailable energy.
Which energy is always available?
Unlike solar and wind energy, geothermal energy is always available, 365 days a year.
Explanation: Unavailability or Unavailable energy (UAE): According to II nd law of thermodynamics complete conversion of heat into work is not possible. Only a part of heat can be converted into work.
What is difference between Exergy and available energy?
Energy of a particular substance is the ability of that substance to do work while exergy is a thermodynamic term which describes the maximum useful work that a substance can perform during the process of bringing a system into equilibrium with a heat reservoir. This is the key difference between energy and exergy.
One dictionary definition of entropy is that it is “a measure of thermal energy per unit temperature that is not available for useful work” in a cyclic process. For instance, a substance at uniform temperature is at maximum entropy and cannot drive a heat engine.
Which of the following represents unavailability?
What is availability and anergy in thermodynamics?
Which means availability is the maximum amount of useful work that can be extracted from a thermodynamic system with respect to the given surroundings. And the minimum amount of energy which is left as low-grade energy in this energy conversion is called Anergy. Let’s consider a reversible heat engine.
What is the difference between available and available energy?
· Available energy, which under ideal conditions may be completely converted into work · Unavailable energy which is usually rejected as waste. Consider Q units of heat energy available at a temperature T. Available part of energy can be obtained by assuming that the heat is supplied to a Carnot engine.
What is the availability of low-grade energy?
The available energy (availability or exergy) of the low-grade energy, symbolizes the amount of work potential of that low-grade energy with respect to the given surroundings. Which means availability is the maximum amount of useful work that can be extracted from a thermodynamic system with respect to the given surroundings.
What is the difference between energy availability and work potential?
For example, inter-molecular energy, thermal energy etc. The word availability is used in context of low grade energy. The available energy (availability or exergy) of the low-grade energy, symbolizes the amount of work potential of that low-grade energy with respect to the given surroundings.