*Sustainable Energy Efficient Industrial Facility Design DOI: http://dx.doi.org/10.5772/intechopen.108829*

period and therefor the subsequent modifications afterwards, the modification must be engineered in an exceedingly way that it shall be swiftly implemented. It needs extensive design experience to capture these elements into equipment design and develop it further to other details like piping layout, foundations, plot plan etc. It needs time to conduct analysis and also due to proposed design modifications, new scenarios for several engineering activities are going to be created, as an example HAZOP or RAM Study/assessment require more times to incorporate future retrofits, which is kind of challenging to realize. Finally, to appreciate such design the foremost important equipment is heat exchanger which must be designed with better understanding about future enhancements and well flattered by other designs like piping layout, foundations etc. Available tools like 3D models would definitely help in visualizing solutions and consequently within the design development.

## *5.2.4 Waste energy recovery technologies*

One of the challenges of Sustainable Energy Efficient Facility Design is that the application of waste energy recovery technologies, as these technologies are evolving almost each year. It'd be difficult to define the energy efficiency of the facilities because of its application, as these technologies have very different efficiencies yet as different application will ends up in very changed facility efficiencies. It'd cause the requirement of developing an expert system which incorporates all commercially available waste energy recoveries technologies and a framework for their application which is quite challenging.
