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stage of the process. The outlet exhaust temperature before heat recovery was often in excess of 100oC. After heat recovery the temperature was 35oC. Percentage heat recovery was 55% and payback on the investment was estimated to be about 18 months. Cross contamination of the fresh air from the solvent in the exhaust gases was at a very acceptable level. Case Example A ceramic firm installed a heat wheel on the preheating zone of a tunnel kiln where 7500 m3/hour of hot gas at 300oC was being rejected to the atmosphere. The result was that the flue gas temperature was reduced to 150oC and the fresh air drawn from the top of the kiln was preheated to 155oC. The burner previously used for providing the preheated air was no longer required. The capital cost of the equipment was recovered in less than 12 months. Heat Pipe A heat pipe can transfer up to 100 times more thermal energy than copper, the best known conductor. In other words, heat pipe is a thermal energy absorbing and transferring system and have no moving parts and hence require minimum maintenance. Figure 8.7 Heat Pipe The Heat Pipe comprises of three elements – a sealed container, a capillary wick structure and a working fluid. The capillary wick structure is integrally fabricated into the interior surface of the container tube and sealed under vacuum. Thermal energy applied to the external surface of the heat pipe is in equilibrium with its own vapour as the container tube is sealed under vacuum. Thermal energy applied to the external surface of the heat pipe causes the working fluid near the surface to evaporate instantaneously. Vapour thus formed absorbs the latent heat of vapourisation and this part of the heat pipe becomes an evaporator region. The vapour then travels to the other end the pipe where the thermal energy is removed causing the vapour to condense into liquid again, thereby giving up 8. Waste Heat Recovery Bureau of Energy Efficiency 9PDF Image | WASTE HEAT RECOVERY
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