The XVII century witnessed enormous development in experimental thermal science fostered by the invention of many new scientific instruments. One of these Fahrenheit’s mercury-in-glass thermometer, appeared at the beginning of the century and paved the way for much of progress in thermal science. Thermal energy technologies are one of the key technologies for energy conservation and therefore are of great practical importance. Then the Energy Management has been an important tool to help organizations meet these critical objectives for their short term survival and long term success. The utilization of renewable energy sources is growing very rapidly to meet the energy demands of various sectors.