Study On Performance Of Ground Source Heat Pumps Under Dynamic Load

The proportion of building energy consumption to total social energy consumption is increasing gradually, thus in the national development guideline of"tenth five year plan"and"twelve five year plan", the building energy saving had and has been put on critical place. The building energy saving mainly emphasizes on the enhancement of utility efficiency of HVAC.In the Ground Source Heat Pump System, the earth was a lowstand heat/cold source to provide the heat and cold energy. Investigations indicated that the imperfectly designing or operating of the system would lead to the serious drop in performance of ground heat exchanger for GSHP and the increase in energy consumption, more seriously, cause the system crash down, which is to bring great barriers of the promotion and popularization of the new technology.In this article the author began with the analysis of load, in which the characteristics and patterns of the load distribution in various regions and buildings were analyzed intensely, the daily and seasonal load changes features and load changes in various climate were summarized, the specific loads and parameters which affect the performance of Ground Source Heat Pumps were found. These parameters directly determined the total cold and heat energy amount of GSHPs used in various buildings. The distribution characteristics of the cold and heat energy determine whether or not the heat exchangers could keep the good performance in the long run in the limited buried places, which in turn decided the years of the effective operation of Ground Source Heat Pump Systems.The dynamic action of grounded heat exchangers directly determined the performance of Water Source Heat Pump Set which was controlled by the changes of indoor loads. The load characteristics meanwhile determine the heat exchanging performance of grounded heat exchangers. In this article, the various parameters affecting the exchangers'performance were analyzed. According to the parameters, combined with load distribution features, the affects of heat exchangers on surrounding earth temperature under the daily dynamic load and the affects on exchangers'performance due to the load changes in various climates were analyzed. The reliability...