Thermal-economic Modeling and Optimization of Ground-Coupled Heat Pump System for Various Climatic Conditions of Iran

Tabarjafar Gholibisheh, Hamzeh | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42102 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour Tehrani Fard, Madjid
  7. Abstract:
  8. The optimal design of a ground-coupled heat pump (GCHP) system with vertical ground heat exchanger (VGHX) includes thermal modeling of the system and selection of optimal design parameters is presented in this research. Then, by applying Nelder-Mead optimization algorithm, an objective function (Total Annual Cost which is the sum of annual investment and operating costs of the system) is defined and minimized, exposed to specified design constraints. Also, Genetic Algorithm is used to verify the optimal design process. In order to evaluate the accuracy of a presented model, the optimum values of a heat pump design parameters includes saturated temperature/pressure of a condenser and evaporator as well as VGHX design parameters includes inlet and outlet temperatures of a ground loop fluid, depth and number of boreholes and pipe diameter are predicted for a case study. Then, a parametric study into the effects of various important parameters on optimal design ofa system is performed using a presented model. Different parameters such as climatic conditions, system capacity, soil types, refrigerant types and number of parallel boreholes are among the studied parameters. Results from optimum values show that for regions with temperate climate in Iran, the GCHP system has the best performance. Also compare to the regions with dry, low density soil, installing the system in conditions with dense, moist soil may lead to a significant increase in the system performance and consequently lower costs. Furthermore, it is shown that there is a reverse effect on objective function with increasing the number of boreholes which results in an optimum amount. Finally, the sensitivity analysis of change in optimum design parameters with increase in the investment and operating costs is performed.
  9. Keywords:
  10. Parametric Study ; Optimal Design ; Thermal-Economic Modeling ; Ground Coupled Heat Pump System ; Ground Heat Exchanger

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