List of Articles Open Access Article Abstract Page Full-Text 1 - A review of increasing efficiency and reducing energy consumption in Domestic refrigeration systems using nano-refrigerants Majid Jalilian mohammad hassan kamyab Hamed sharifidoost Open Access Article Abstract Page Full-Text 2 - The effect of waste heat of the direct reduction iron in an innovative power-refrigeration cycle Mohammad Ebadollahi Seyed Hashem Samadi Open Access Article Abstract Page Full-Text 3 - Design Algorithm of Ventilation Silencer to Reduce Sound Pollution in Air Conditioning Systems Ali Faezian Hashem Ahmadi Tighchi Mohammad Mehdi Parsafar Open Access Article Abstract Page Full-Text 4 - Design of a Nonlinear Optimal Controller for an Air Handling Unit in the HVAC System Fariba Bouzari Liavoli Hasan Karimi