| Abstract |
Izmir Institute of Technology (IZTECH), founded in 1992, has a geothermal resource in the border of the Campus with a temperature of 33?C. At present, the Campus is still under development and each faculty building has an individual fuel-fired boiler heating system. District heating system design consists of two parts: heating system design and piping network design. Piping network design is given in another paper at World Geothermal Congress, titled as "Piping Network Design for IZTECH Campus Geothermal District Heating System, Izmir, Turkey", extensively (Yildirim et al., 2004). In this study, heating system design of IZTECH Campus is given in detailed. Because the production well has low geothermal fluid temperature; heat pump district heating system (HPDHS) is considered to be the best option. As an alternative, boiler-heating system is considered for comparison. Each heating system is simulated using hourly outdoor temperature data. For the simulations, the main control parameter is the indoor temperature of the buildings. Mathematical models are derived using Matlab and EES programs. Various heating regime alternatives have been studied for HPDHS for the various condenser outlet temperature and geothermal fluid flowrate and two of these alternatives are given in this study. Furthermore, economic analysis has been done for each heating system alternative depending on investment and operational costs. According to the results of the economical analyses, while HPDHS has the highest investment cost with 3,040,125 US$, it has minimum operational cost. The alternatives are evaluated according to internal rate of return (IRR) method, which shows the profit of the investment. The results indicate that, the HPDHS has minimum 3.02% profit comparing with the fuel boiler district heating system (FBDHS) at the end of the 20-year period. |