This book deals with the thermodynamic performance of a forced convection solar air heater. The performance study is presented, after evaluating solar air heater with four different absorber plate configurations. The experimental observations were made under the meteorological conditions of Coimbatore city in India. Thermodynamic analysis is made on the basis of first and second law of thermodynamics. The performance of solar air heaters are simulated with the help of newly developed Artificial neural networks models for different types of absorber plates to have realistic performance comparison. The observed results are explicitly discussed in this book.