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Design of Condensing Heat Exchangers for Recovery of Heat and Water from Flameless Combustion Flue Gas

Homaei, Shabnam | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49037 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Saboohi, Yadollah
  7. Abstract:
  8. The exit flue gas temperature of conventional gas fired boiler is generally high and considerable energy is lost to environment. Therefore, new methods are needed to recover water and heat from boiler flue gas in order to reduce overall plant water consumption as well as to increase energy efficiency and mitigate detrimental emissions. This project involved design of a heat and water recovery system including condensing heat exchangers to be used in residential buildings. In this project based on simulation of heat and water recovery system the recoverable amount of heat and efficiency improvement potential at various conditions such as different exit flue gas temperatures and different heat exchanger materials are presented in two scenarios. In first scenario heat and water recovery system performance is based on heating and domestic hot water demands during the year. Additionally, in the second scenario the performance of heat and water recovery system is based on heating and cooling and domestic hot water demands during the year. The payback method is employed to analyze the most economical exit flue gas temperature from heat exchanger. The results show that economically, the optimum exit flue gas temperature is approximate 40°C; at this temperature utilization of recovery system leads to approximate 11% efficiency improvement. Also according to result from economic viewpoint utilization of recovery system is not interesting for householders due to low price of energy carriers, such as natural gas in, Iran. Moreever it is suggested that in first and second scenario the price of natural gas should be increased up to 8 cent/m3 and 5 cent/m3 respectively
  9. Keywords:
  10. Residential Buildings ; Flue Gas ; Energy Consumption Optimization ; Heat and Water Recovery ; Condensing Exchanger ; Boiler Room

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