Application of solar energy in commercial and industrial companies in present days is insignificant compared to other non-renewable energy. Solar applications in industrial processes have only occurred on a relatively small scale and been mostly experimental in nature. However, if one compares the energy consumption of the industrial, transportation, household and service sectors then one can see that the industrial sector has the highest energy consumption in countries. Just one third of this

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... nergy demand is related to electricity, but two thirds are related to heat. The major share of the heat, which is needed in commercial and industrial companies for production, processes and heating production halls, is below 250°C. The low temperature level (< 80°C) is consistent with the temperature level that can easily be reached with non-concentrated collector. Here use of smaller parabolic troughs, with concentration ratios between 10 and 20, can operate at temperatures between 100°C and 250°C. In this paper, various application of parabolic trough collector is reviewed for industrial process heating along with available case studies.