Design And Economy Analysis Of Ground-Coupled Heat Pump System

At present, the most commonly used cold source and heat source of air conditioner in our country are based on electric power and fossil energy (coal, oil, gas), especially, coal consists the most part of the energy, the energy structure is unreasonable, the energy utilization ratio is low, and the environment is seriously polluted. From the viewpoint of sustainable development, while choosing the cold source and heat source of air conditioner, we should consider from respects such as energy-efficiency, environmental protection, etc. The ground-coupled heat pump, regarded as a green air conditioner that takes energy-conservation and environmental protection as characteristics in the 21st century, has broad development prospects in our country.This paper sets up the model of buried heat exchanger for ground-coupled heat pump system, programs the solving procedure of heat transfer content per meter pipe, and analyzes the influence on heat transfer content per meter pipe of designed outlet temperature of the circling liquid in buried heat exchangers, buried distance, drilling depth and soil thermophysical parameters, and then provides reference for the chosing of parameters during the designing of the ground-coupled heat pump systems.Beginning with the study of the climates of three areas-Shanghai, Guangzhou, Tianjin, this paper figures out dynamic load during the whole year with modified BIN method, according to the climate characteristics of every city, chooses four kinds of commonly used cold source and heat source systems and carries on comparative analysis with ground-coupled heat pump system. Through every scheme's part-load curve of unit selected, calculates their energy consumption through out the year, then converts into the primary energy consumption and carries on comparation, meanwhile, analyzes the influences on environment through calculation. The initial cost and operating expenses of every project is obtained, and economic evaluation of every project is carried out with annual cost approach.The author selects drilling expense, fuel price, life cycle and interest rate as the sensitive factors, and carries on sensitiveness analysis to annual cost of every...