Keywords: exergy of cold, cool exergy, exergy analysis, exergy factor, cool exergy potential, exergy demand, cooling processes, regasification, liquefied natural gas, LNG, buildings
Understanding the exergy of cold: theory and practical examples
Exergy analysis is used to evaluate the thermodynamic performance of processes, including energy conversion and supply systems. This often involves the calculation of the exergy of heat, at a temperature either above or below the environmental temperature (T0). The exergy of 'cold', i.e., heat at T < T0, is less used and therefore sometimes also less understood. This paper broadens the understanding of the exergy of cold by discussing the theory and giving two useful examples illustrating the added value of exergy when considering cold: The regasification of Liquefied Natural Gas (LNG) and the exergy demand of cooling in buildings.