In general terms, it is more economical to recover the heat for transfer to a suitable heat sink by heat exchange or direct re-use as this equipment has the cheapest capital outlay. Inherently, it is also preferable to transfer this heat to with the process from which it is emitted or to a nearby process as this saves the cost of transport via pipe work, ducts and auxiliary equipment. Solution such as heat pumps and unit to generate electricity or refrigeration require more capital outlay due to higher equipment costs. over the fence heat sink i.e, heat sinks outside the boundaries of the current process plant are also an option, as well as the opportunity for a secondary enterprise to exploit the waste heat source but generally these option require significant capital outlay and market reacher Fig. 2 shows a basic flow chart representing the capital cost of each type of project.