Cooling Effect Of Buried Pipe Fresh Air System

As the energy and environment problem increasingly prominent, energy saving become common thought. Air conditioning energy saving is a hot topic of people, how to effectively use renewable energy to fulfill the requirements of air conditioning is one of the focus of research.Buried pipe fresh air system takes advantage of the shallow renewable soil energy which is regarded as the cold source around the buried pipe to cool the fresh air. In addition,the buried pipe fresh air system can reduce the air conditioning load and achieve the goal of saving energy.This paper studies on the cooling effect of the system based on the research at home and abroad from three aspects that is analyzing the factors of the system cooling capacity by theoretical method,presenting the technique and the economic feasibility of the buried pipe fresh air system through the engineering design and the numerical simulation study on the influence of buried pipe fresh air system to the indoor thermal environment.First of all, the article summarizes the cooling principle of buried pipes fresh air system and the shallow soil initial temperature calculation model, for the theoretical analysis of buried pipe fresh air system provides the theory basis for research to the influential factors of cooling capacity.Secondly, the article with the help of soil-air heat exchanger in cooling end temperature calculation model, the theoretical analysis of the summer with fresh air system cooling capacity of buried pipes buried pipe length, radius of buried pipe, buried pipe air velocity and inlet air temperature change effect the cooling capacity of the system. Also the paper introduce related parameters of the rural house building in hot summer and cold winter area, characteristics and major cities from the point of view of an system cold source temperature in hot summer and cold winter region the applicability of the buried pipe fresh air system.In order to further buried pipe fresh air system in hot summer and cold winter region rural house the feasibility of the project application, the research of a rural residential project of the buried pipe fresh air system engineering design in ganzhou city of jiangxi province were performed,the results show that the fresh air system with static investment payback period is short, run the characteristics of low energy consumption, in rural areas has the prospects for development.Finally, rural residential projects in hot summer and cold winter area as the research object, the physical model was established regarding the rural house project as the research object in hot summer and cold winter area and utilized the CFD software to simulate the effect of buriedpipe coupled with fresh air system to the indoor thermal environment. Through the simulation of the two model which was the buried pipe fresh air system and the traditional air conditioning system relatively, the results showed that the buried pipe fresh air system could improve the indoor velocity field and the temperature distribution. Meanwhile,the results also showed that the buried pipe fresh air system could reduce the indoor carbon dioxide concentration and the average age of air at various points and improve the residents home air quality.