The Evaluation Of Ground-Coupled Heat Pump System In Different Climatic Region

Excessive energy consumption leads to a series of environment problems, for example, the destruction of the ozone layer , global warming and so on. The proportion of HVAC energy consumption in building energy consumption is increasing continuously in our country, and the main energy are electricity and fossil. The coal accounts for the maximum proportion , which the energy utilization ration is low and the environment is seriously polluted. for the sustained development, we develop many new air conditioning systems. The ground-coupled heat pump (GCHP) system has got more and more recognition for the advantages of high energy utilization ration, good energy efficiency, simple system and no environment pollution. This technology has broad development prospect in our country.The benefits of GCHP have something. to do with building load, soil parameters, local energy price and so on. The GCHP system can be not used in all cities, and it can not be used in all types of buildings in one city. The cost of the system is a little high. If we used it in blindness it may fall shot of the perfect effect, or even can't run as normal. That will waste much energy and resource.The paper gives a series of evaluate indexes of GCHP system from the integrated viewpoint of energy efficiency, economic benefits and environment protection. The energy efficiency indexes contain seasonal system energy efficiency ratio, primary energy ratio, energy saving rate, saved amount of standard coal. The evaluation of economic benefit is by the method of payback period according to the initial cost and operating expense. The environment protection indexes contain greenhouse emission reduction, smoke duct and cinder reduction.The paper selects five typical cities- QiQiHaer Shenyang, Beijing, Shanghai and Guangzhou according to different climatic region. It sets up the models of GCHP system and local conventional cold and heat source system by the software of TRNSYS. Through the dynamic energy consumption for an office building, the paper calculates the evaluation indexes of GCHP system in five typical cities and gives the sustainability evaluation of GCHP for the different climatic region. The duct length of ground heat exchanger of GCHP system is designed by the method of experience estimation plus the verification of system simulation.The research conclusion provides the reference to developing the application of GCHP technique. That will lead to the healthy development of GCHP and prompt the reasonable utilization of renewable energy. That also gives some references to reasonable designing of GCHP system in practical engineering.