Understanding What is the Energy Availability Equation
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                According to the second law of thermodynamics, not all energy in a system is available for useful work. The concept that quantifies this useful work potential is defined by the energy availability equation, a fundamental principle known as exergy in engineering and physics.