액화 공기 발전소의 폐열을 활용한 냉방시스템의 에너지 절감 분석

Abstract

Currently, various studies on efficiently using and storing energy are being conducted worldwide, and a method of storing liquefied air as an energy field method is in the spotlight. Research on the liquefied air storage method is being conducted in various ways, but current research is mainly focused on power generation and the liquefaction process. Particularly, research is not conducted in the case of cooling through the discharged air after power generation through liquefied air. In this paper, a study was conducted on the reduction of power consumption in the case of cooling by utilizing generator discharge air that is meaninglessly discarded. The study was conducted through simulation, and the parameters in the simulation were external air temperature, discharged liquefied air temperature, heat load, return air ratio, and indoor maintenance temperature. In addition, the reduction in power consumption during the partial operation was confirmed at indoor loads of 5.8RT and 8RT. As a result, the higher the outside temperature, the higher the power consumption. As the indoor load increased, the reduction in power consumption tended to increase until 5.89RT, but the reduction rate showed a tendency to decrease above 5.89RT. The power consumption tended to decrease when the indoor temperature increased, and the power consumption when the air conditioner was not operated using only liquefied air showed a constant pattern at 25℃ and 26℃. When only liquefied air was used for cooling using low-temperature air discharged from a generator, constant power consumption was shown regardless of the temperature of the discharged low-temperature air, but the amount of liquefied air consumed tended to decrease as the discharged air temperature decreased. As a result of the simulation according to the return air ratio, the power consumption tended to increase in cooling using liquefied air as the return air ratio increased. In the partial load operation simulation, the daily power consumption reduction rate was 65% when the indoor load was 5.8RT, and the power consumption reduction rate was 52% when the indoor load was 8RT.