Velox boiler transfers heat from the gas at a much higher rate than the rate achieved with the sub-sonic flow when the gas velocity exceeds the sound velocity. The advantages of this theory are taken to effect the large heat transfer from a smaller surface area in thi…

A good boiler should have the following characteristics: The boiler should have maximum steam generation rate with minimum fuel consumption. It can be started or stopped quickly. Its initial cost, running and maintenance cost should not be high. Its erection time shou…