The Iranian government encourage the implementation of Distributed Generations (DGs) especially high-efficiency combined heat and power (CHP) systems. CHP could be a sustainable provider of a significant proportion of energy needs for domestic properties. In this paper the use of CHP for a large building complex to provide electric power and the necessary heat for residential dwellings in Iran is investigated. Different factors such as investment cost, maintenance and operation costs of CHP, demand, and the numbers of hours that CHP can provide energy in a year are taken into account. On the other hand the cost of procurement, operation and maintenance of the heating and water heating devices are also considered. Two different scenarios have been considered and investigated for investors. In the first one the output and heat power is used for the building and in the second one the electric output power is sold to the distribution system and the required electric power is bought from the network. These two scenarios are implemented and results along with discussion in detail are provided.
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