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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 49918 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Bastani, Dariush
- Abstract:
- In the present study, a heat recovery system for a distributed generation plant (DG) with a 1 MW gas combustion engine has been designed. The purpose of this designing is converting the power plant to a CHP system. For the existing heat recovery system, a shell & tube heat exchanger is designed to recover the thermal energy from exhaust gases and a plate heat exchanger is designed to recover the thermal energy from the engine jacket cooling fluid. The heat exchanger design has been calculated manually and also by use of software. In the software calculation, the heat exchanger design has been done by use of the Aspen HTFS +2006.5 software. In the manual one, the Kern equation (1950) was used to calculate the heat transfer coefficient and friction coefficient of the fluid inside the shell also, the Sieder & Tate equation (1936) was used to calculate the heat transfer coefficient of the fluid inside the tube, the Moody diagram was used to calculate the friction coefficient of the fluid inside the tube. In addition, the Kumar equation (1984) has been used to calculate the heat transfer coefficient and friction coefficient of fluids in the plate heat exchanger. By comparing the results, a significant difference was found between manual calculation and computer one for the heat transfer coefficient and the friction coefficient of fluid inside the shell. However, the final results of calculating the heat transfer surface required for shell & tube heat converter and plate heat converter with a slight difference (less than 10%) between manual and software calculations was obtained. Finally, the calculation of the primary engineering economics for this one-megawatt power plant in the country (Iran) in 1396 has been done, and the effects of adding a heat recovery system on increasing energy efficiency and economic efficiency at this plant have been assessed. The results of economic calculation and energy efficiency indicate an 8 percent increase in the internal rate of return (IRR) and a 47 percent increase in energy efficiency at this plant
- Keywords:
- Combined Heat and Power (CHP)System ; Heat Recovery Section ; Energy Regeneration ; Engineering Economics
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