외기온도에 따른 프리쿨링 시스템의 성능 특성 및 경제성평가

Abstract

With growing the industry, the case that requires the cooling load in winter is increasing. therefore, the demand for energy is rapidly increased in the winter as well as summer. To solve the this problem the free cooling system is develop. The free cooling system use the cooled outdoor temperature to cool the water. Usually it uses the cooling tower in order to cool the water. But the cooling tower has problems that are installation for cooling tower, freeze and burst. In order to solve the problem, the free cooling system with dry-cooler is suggested. In case of the foreign country the study for the free cooling system with dry-cooler is active but in case of the domesticity the study for it is deficient. Thus, in this study the free cooling system with dry-cooler is analyzed. Also, the national adaptability for the free cooling system is examined using economic analysis base on the outdoor temperature in the domesticity. The free cooling system has the three cases which are explained in the body of the study. Through the experiment, the electric power, outlet water temperature and cooling load are measured with the tree cases. In the result of the experiment, the measuring efficiency is about 10 percent between experiment data and simulation data. Through the experiment, the credibility of simulation is checked. When the free cooling system is used for the data center and industrial process, the energy saving rate is approximately 38 percents. Using the previous result, the economic evaluation based on free cooling system is conducted. Through the evaluation, the free cooling system has a refund before a year. Thus, when the existing cooler have used for 10 years, the free cooling system is better than existing cooler.