Economic Analysis Of Ground Source Heat Pump System

Ground source heat pump (GSHP) is more and more attention-getting in the world as a technique of energy saving and environment protection. Some dynamic performance and potential of energy saving of GSHP are developed in China. The development of the study of GSHP is now still at the beginning with lacking basic operating data and experience of design and running. As GSHP system usually needs more initial cost than air source water cooling heat pump system, its economic performance can be discounted due to unreasonable design or inconsequent matching which will result in more running cost. So it is very significant to study the economic performance in the application of GSHP. A method which is used in thermoeconomics is presented here to improve the thermal and economic performance.According to a GSHP system in an office building, a mathematical model is established. Theoretical investigations are carried on the base of the mathematical model and experimental data. The character in the operation of the two seasons of winter and summer, the heat transfer performance are carried out. Exergy analysis is also presented on the base of the former research which leads to the direction and methods of energy saving. It is also the base of thermoeconomic analysis.It is the first time that thermoeconomic method is used in the study of GSHP system. Costing of exergy consumption and loses, algebraic methods of exergy costing and autonomous methods of exergy are presented to analysis exergy GSHP. The result is used in the local and whole optimization in which cost par value, earning yield etc are used to discover the internal connections between thermal and economic performance.The result of investigation indicated that it's strongly necessary to enhance the outside heat transfer of the downhole heat exchanger and make all parts matched well. Heat transfer enhancement of the outside of the downhole heat exchanger is very important to the decrease of the initial and running cost, especially in the conditions of air conditioning. The result also proved that increasing local exergy efficiency could not improve the economic performance of the GSHP system. Optimization should be considered according to the wholesystem to make economic and thermal performance matched well. It is also further pointed out the key and direction for enabling the GSHP system by means of study of the performance and energy saving.