Evaluation of energy conservation by second-stage drying

Second-stage drying is a process in which latent heat from a dry kiln is captured and used to heat a smaller secondary kiln. Three second-stage chambers were constructed and three different heat exchanger profiles were tested. Twenty tests were run with primary kiln conditions of 121?C dry bulb and 100?C wet bulb. Equations were developed that predicted the amount of attainable heat based on the heat exchanger design and the temperature of the second-stage chamber. Results indicate that this technology is effective at capturing the latent heat given up by the condensation of water.

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