Napoleon Enteria - Variable Refrigerant Flow Systems: Advances and Applications of VRF

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The global issue on energy and environment became a serious as concern for sustainable and reliable supply of energy sources will not affect the environmental sustainability. Issues related to the application of the heating, ventilating, and air-conditioning (HVAC) system to maintain the environment or space consumed sizable amount of energy and contributed to the stress of energy supply and environment stability. Hence, development of energy-efficient HVAC technologies is a constant challenge.

There are different HVAC technologies which depend to the application and energy source. There are on-going researches and development efforts on the refinement of different HVAC technologies to make it energy-efficient and reliable. Development of new materials, working fluids, and hybrid system has become some of the directions of the advancement of the HVAC engineering. Hence, some of these systems are now the subject of intense research and development effort.

The variable refrigerant flow (VRF) system is one of the HVAC systems with intense effort of research and development. The VRF system can be classified as single-loop (simple) and multi-loop (complex) which are the two common systems available in the field. There are commercialized VRF systems, systems under testing and trials, systems under laboratory evaluation, and systems under basic research. Hence, the VRF system is one of the important topics for HVAC engineering.

The editors are thankful to the invited experts for their contributed article in this book. Despite their very busy schedule with several commitment, they are still motivated to contribute a chapter with their expertise. The editors are also thankful to the reviewers for their untiring support for the evaluation of the book. The editors are also thankful to the publishers for giving us opportunity for the publication of this book. The editors are also thankful to our family for the full support for making this book possible.