Abstract
In this study, we examined the event of condensing water vapour in flue gas in order to recoverthe latent heat that is carried by exhaust flue gas in 60 MW natural-gas fired district heating system of a university. With this, we aimed to design theoretically a waste heat recovery unit and conduct an economic analysis of it. For this study, actual operation data of the system were taken. In the design calculations of flue gas condenser, we used one-dimensional Finite-difference Method and made a computer programme. According to calculation results, exhaust flue gas temperature can be decreased to 40 °C with a flue gas condenser that has 80 m2 surface area and is made of 316 quality stainless steel horizontal plain tube bundles. Annual fuel saving was calculated as $ 407,396.16 with Annual Equivalent Analysis Method.
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