A heat pump uses natural energy from renewable sources such as air, ground or water. The pump, acquiring thermal the environment (75%) and using electricity (25%), supplies it to heated object. pump-based system consists of a source (heat is taken it), unit an upper transferred it). refrigerant transfers lower source. paper discusses types pumps in terms use technical economic analysis was carr...

one of the effective methods for improving the efficiency of an organization is benchmarking against successful organizations. not only benchmarking could be a technique for identifying problems but also it greatly helps managers in relations of the design of processes. among strategic and infrastructure industries in each country, the electricity industry is one of the most important and criti...