The Experimental Study And Simulation Of Characteristic Of Ground-Water Source Heat Pump

Among various heat pumps, the Ground-Water Source Heat Pump (GWSHP) system has the highest energy efficiency. Just because of this, in recent years, GWSHP system has become more popular in our country. However, the design standard of GWSHP system hasn't been established, and the data of the operating characteristic of the system is incomplete, so the development of the GWSHP system is still limited. In order to resolve these problems, a test facility of the GWSHP system was been built. The system features were analyzed and simulated based on the experimental results.In this paper, it emphasized on the influence of the supply temperature of the ground-water, the temperature difference between supply and return ground-water, the flow-rate of the well on the system. The experimental results showed that: in the summer operating mode, the refrigerating capacity and coefficient of performance of the system decreased with the increase of the temperature difference between supply and return ground-water and the water supply temperature; in the winter operating mode, the refrigerating capacity and coefficient of performance of the system increased with the decrease of the temperature difference between supply and return ground-water and the increase of the water supply temperature.It also showed that, in summer operating mode, in the same water supply temperature of the well or with the increase of it, when the temperature difference between supply and return ground-water increased, the influence of it on the system features decreased which was still little than the influence of the flow-rate of the well on the system features. Furthermore, the GWSHP system features were[1] Prof. Lian Zhiwei, xi'an university of architecture & technology. [2] Prof. Zhou Guanghui, zhong yuan insitute of technology.still super than the standard Water-Source Heat Pump with the water supply temperature of the well 22 ℃ and the temperature difference between supply and return ground-water 8℃. So, it's suitable for the GWSHP system with high temperature difference between supply and return ground-water and low flow-rate of the well.Based on the experiments, the simulation of the condenser was accomplished which also offered a favorable condition to the establishment of the whole GWSHP system model. During the modeling, considering the characteristic of the condenser and plate heat exchanger, many methods were used to improve the veracity and astringency of the model, such as: dividing the condenser into several tiny segment with equal area; separating the condensing process into single-phase region and double-phase region; dealing with the tiny segment flexibly which covering two regions. The comparing result showed that most of the error between the data of simulation and experiment was within 5% while the maximal error was 8.35%. It's also proved that the simulation of the condenser reflected the condensing process rule well, the applicable range of this model was extensive, and the results were reasonable.